Rockpool Life

Barnacles

Semibalanus balanoides

Ryan Hodnett, CC BY-SA 4.0, via Wikimedia Commons

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Barnacles

Semibalanus balanoides

What it eats

Plankton, which they catch by waving their feathery legs in the water. Picture a tiny underwater rave.

How it breeds or multiplies

Barnacles are hermaphrodites, but they still need a neighbor to mate. They use a very long appendage to transfer sperm—practical but not subtle.

Interesting & gruesome fact

Their glue is so strong that it can stick to almost anything, including whales and boats. Scientists are still trying to replicate it for human use!

Its habitat

Rocks, pier pilings, and shells. Basically, anything that doesn’t move is fair game for a barnacle’s forever home

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Beadlet Anemone

Actinia equina

Diego Delso - CC BY-SA 4.0, via Wikimedia Commons

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Beadlet Anemone

Actinia equina

What it eats

Small crustaceans, molluscs, and occasionally small fish.

How it breeds or multiplies

Internal brooding of larvae, which are then released into the water.

Interesting & gruesome fact

When disturbed, it retracts its tentacles and becomes a bright red blob—nature's stress ball!

Its habitat

Rocky shores, often in exposed areas where waves crash.

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Bladder Wrack

Fucus vesiculosus

User Stemonitis on en.wikipedia - CC BY-SA 2.5, via Wikimedia Commons

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Blue-rayed Limpet

Helcion pellucidum

Andy.Cowley - CC BY-SA 1.0, via Wikimedia Commons

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Breadcrumb Sponge

Halichondria panicea

Unknown, Public domain, via Wikimedia Commons

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Breadcrumb Sponge

Halichondria panicea

What it eats

Filters tiny plankton and organic particles from the water. It’s like a natural water purifier.

How it breeds or multiplies

Can reproduce sexually by releasing sperm and eggs into the water or asexually by budding. Flexibility is its secret to success.

Interesting & gruesome fact

When disturbed, it releases a noxious odor. Imagine bread that smells terrible—hence its name!

Its habitat

Attached to rocks and hard surfaces in tidal pools and shallow waters.

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Brittlestar

Ophiothrix fragilis

Parent Géry - Public domain, via Wikimedia Commons

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Brittlestar

Ophiothrix fragilis

What it eats

Organic particles and plankton, gathered using its long, flexible arms.

How it breeds or multiplies

Releases eggs and sperm into the water, resulting in free-swimming larvae.

Interesting & gruesome fact

If attacked, it can drop an arm to escape and regrow it later. A life-saving party trick!

Its habitat

Shallow sandy seabeds and rocky tide pools.

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Brown shrimp

Crangon crangon

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Brown shrimp

Crangon crangon

What it eats

Small invertebrates and organic matter. It's not fussy and loves a good sand buffet.

How it breeds or multiplies

Females carry their eggs under their abdomen until they hatch into tiny, transparent larvae.

Interesting & gruesome fact

Sand shrimp are masters of camouflage, blending perfectly with sandy seabeds. You'll need eagle eyes to spot them!

Its habitat

Sandy and muddy seabeds, often buried during the day to avoid predators.

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Butterfish

Pholis gunnellus

Jack Sewell - CC BY 4.0, via Wikimedia Commons

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Carrageen

Chondrus crispus

Voctir - CC BY-SA 4.0, via Wikimedia Commons

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Celtic Sea Slug

Onchidella Celtica

Auguste Le Roux - CC BY-SA 4.0, via Wikimedia Commons

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Celtic Sea Slug

Onchidella Celtica

What it eats

Algae and biofilm. It’s a slow-moving grazer, vacuuming up microscopic goodies from the rocks.

How it breeds or multiplies

Hermaphroditic, meaning every individual has both male and female reproductive organs. They lay small clusters of eggs in safe, sheltered spots on rocks.

Interesting & gruesome fact

Unlike other sea slugs, the Celtic Sea Slug doesn’t have flamboyant colors. Instead, it’s a stealthy greyish-brown that blends perfectly with the rocks. It’s Cornwall’s very own marine ninja.

Its habitat

Exclusively found on rocky shores in Cornwall and a few nearby locations. A truly Celtic specialist!

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Common Blenny

Lipophrys pholis

Gilles San Martin - CC BY-SA 3.0, via Wikimedia Commons

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Common Blenny

Lipophrys pholis

What it eats

Small crustaceans, molluscs, and algae. They dart out from their hiding spots to grab unsuspecting prey.

How it breeds or multiplies

Males guard eggs in rocky crevices until they hatch. Talk about dedicated dads!

Interesting & gruesome fact

They can breathe air and survive out of water for hours! They're like the amphibians of the rockpool world.

Its habitat

Rocky shores and tide pools, often hiding in crevices or under seaweed.

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Common Goby

Pomatoschistus microps

Donald Davesne - CC BY-SA 4.0, via Wikimedia Commons

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Common Limpet

Patella vulgata

Didier Descouens - CC BY-SA 3.0, via Wikimedia Commons

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Common Limpet

Patella vulgata

What it eats

Grazes on algae and seaweed using its rough tongue called a radula.

How it breeds or multiplies

Releases eggs and sperm into the sea during stormy weather.

Interesting & gruesome fact

Returns to the same spot on the rock after feeding—it has a home base! Nature's homing device.

Its habitat

Rocky shores, firmly attached to rocks in the intertidal zone.

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Common Periwinkle

Littorina littorea

H. Zell - CC BY-SA 3.0, via Wikimedia Commons

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Common Prawn

Palaemon serratus

Etrusko25 - Public domain, via Wikimedia Commons

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Common Prawn

Palaemon serratus

What it eats

Omnivorous diet, including algae, detritus, and small invertebrates. It's the garbage disposal of the rockpool, keeping things clean.

How it breeds or multiplies

Females carry fertilized eggs under their abdomen until they hatch into free-swimming larvae. A mobile nursery in action!

Interesting & gruesome fact

Known for their translucent bodies with distinctive red and yellow markings, common prawns can leap backwards quickly by flicking their tails—a nifty escape tactic.

Its habitat

Rockpools, estuaries, and coastal waters with plenty of hiding spots among seaweed and rocks. They are nocturnal and more active at night.

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Common Starfish

Asterias rubens

Herbythyme - CC BY-SA 4.0, via Wikimedia Commons

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Common Starfish

Asterias rubens

What it eats

Shellfish! Starfish pry open mussels or clams, then do the unthinkable—they eject their stomachs into the shell to digest the prey externally. Gruesome and effective.

How it breeds or multiplies

Males and females release eggs and sperm into the water. Baby starfish start as tiny plankton before growing into their familiar shape.

Interesting & gruesome fact

Lose an arm? No worries—starfish can regrow lost limbs. In fact, an arm can sometimes grow into an entirely new starfish. Nature's ultimate DIY.

Its habitat

Rocky shores and sandy seabeds, wherever mussels and clams are plentiful. They're the slow-moving hunters of the sea.

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Corkscrew Wrack

Fucus spiralis

AlguesConcarneau4.JPG: rosier derivative work: Thiotrix, CC BY-SA 3.0, via Wikimedia Commons

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Corkscrew Wrack

Fucus spiralis

What it eats

Doesn’t eat—photosynthesizes using sunlight. Nature’s green powerhouse.

How it breeds or multiplies

Produces spores in little reproductive nodules at the ends of its fronds. Efficient and low-key.

Interesting & gruesome fact

It's spiral shape isn’t just for show; it helps it survive the strong tidal currents by reducing drag.

Its habitat

Found in the upper intertidal zone, clinging to rocks and thriving in sunlit areas.

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Cushion Starfish

Asterina gibbosa

Peter Southwood, CC BY-SA 3.0, via Wikimedia Commons

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Cushion Starfish

Asterina gibbosa

What it eats

Algae, detritus, and microscopic organisms. It's the cleanup crew of the rockpool.

How it breeds or multiplies

Can reproduce sexually or asexually by splitting in half. Imagine cloning yourself every time you're in a tight spot!

Interesting & gruesome fact

It's tiny compared to other starfish, but it's a master of regeneration. Lose a limb? No problem—it grows back in no time.

Its habitat

Rocky intertidal zones and shallow waters with plenty of algae to munch on.

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Dahlia Anemone

Urticina felina

Derek Keats - CC BY 2.0, via Wikimedia Commons

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Dead Mens Fingers

Alcyonium digitatum

New York-air - CC BY-SA 4.0, via Wikimedia Commons

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Dead Mens Fingers

Alcyonium digitatum

What it eats

Filters plankton and organic particles from the water using its polyps.

How it breeds or multiplies

Releases eggs and sperm into the water during winter.

Interesting & gruesome fact

Despite its creepy name, it's actually a beautiful soft coral that looks like pale fingers reaching up from the seabed!

Its habitat

Lower shore and shallow sublittoral, attached to rocks.

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Devonshire Cup Coral

Caryophyllia smithii

Parent Géry - Public domain, via Wikimedia Commons

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Devonshire Cup Coral

Caryophyllia smithii

What it eats

Catches plankton and small organisms with its stinging tentacles.

How it breeds or multiplies

Can reproduce both sexually and by dividing itself.

Interesting & gruesome fact

One of the few hard corals found in British waters—a true northern coral pioneer!

Its habitat

Lower shore and sublittoral zones, attached to rocks in dark places.

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Dog Whelk

Nucella lapillus

Martin Talbot, CC BY 2.0, via Wikimedia Commons

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Dog Whelk

Nucella lapillus

What it eats

Predator of barnacles and mussels, drilling through their shells.

How it breeds or multiplies

Lays capsules of eggs on rocks, looking like tiny corn kernels.

Interesting & gruesome fact

Can drill through the shells of its prey using acid and its radula—nature's power tool!

Its habitat

Rocky shores, often found among its prey of barnacles and mussels.

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Dulse

Palmaria palmata

Voctir, CC BY-SA 4.0, via Wikimedia Commons

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Dulse

Palmaria palmata

What it eats

Photosynthesizes to create energy from sunlight and absorbs nutrients from seawater.

How it breeds or multiplies

Alternates between two different life stages in its reproductive cycle.

Interesting & gruesome fact

Historically eaten as a snack and known as the 'bacon of the sea' due to its taste when fried!

Its habitat

Rocky shores in the lower intertidal zone, often growing on other seaweeds.

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Edible Crab

Cancer pagurus

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Edible Crab

Cancer pagurus

What it eats

Mollusks, crustaceans, and carrion. This crab uses its powerful claws to crush shells and enjoy a hearty seafood meal.

How it breeds or multiplies

Mating occurs after the female molts her shell. She then carries thousands of eggs under her abdomen until they hatch into planktonic larvae.

Interesting & gruesome fact

Also known as the 'brown crab,' it's a favorite in seafood cuisine. But beware—those pincers can deliver a nasty nip if provoked!

Its habitat

Rocky substrates and sandy bottoms, from shallow waters to depths of up to 100 meters. Often found hiding in crevices or under rocks during the day.

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Elegant Anemone

Sagartia elegans

gordon.milligan, CC BY 2.0, via Wikimedia Commons

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Elegant Anemone

Sagartia elegans

What it eats

Plankton, small shrimp, and anything its stinging tentacles can grab.

How it breeds or multiplies

Reproduces both sexually and asexually, often cloning itself.

Interesting & gruesome fact

It's tentacles are so sticky they’ll snag unsuspecting prey in a split second. An efficient predator in a tiny package.

Its habitat

Lower intertidal zones and shaded rockpools.

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European Lobster

Homarus gammarus

Arnstein Rønning, CC BY 3.0, via Wikimedia Commons

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European Lobster

Homarus gammarus

What it eats

Mollusks, crabs, and small fish. It's the top-tier predator of the rocky seabed.

How it breeds or multiplies

Mates after the female molts. She carries thousands of eggs under her tail for up to 12 months.

Interesting & gruesome fact

Lobsters can live up to 50 years and never stop growing, molting throughout their lives.

Its habitat

Rocky crevices and sandy seabeds in deeper waters.

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Five-bearded Rockling

Ciliata mustela

jujurenoult, CC BY 4.0, via Wikimedia Commons

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Five-bearded Rockling

Ciliata mustela

What it eats

Small crustaceans and worms. Uses its barbels (whisker-like feelers) to find food in the dark.

How it breeds or multiplies

Spawns in winter and spring, releasing eggs into the water.

Interesting & gruesome fact

Those five barbels aren't just for show—they're packed with sensory organs to help find food!

Its habitat

Sandy or muddy areas near rocks, often hiding under seaweed.

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Flounder

Platichthys flesus

Tiit Hunt, CC BY-SA 3.0, via Wikimedia Commons

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Green Sea Urchin

Psammechinus miliaris

Donald Davesne, CC BY 4.0, via Wikimedia Commons

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Green Sea Urchin

Psammechinus miliaris

What it eats

Algae, detritus, and pretty much anything it can scrape off rocks. It's the ultimate rockpool recycler.

How it breeds or multiplies

Males and females release their eggs and sperm into the water, hoping for a romantic swirl. Baby urchins drift around as larvae before settling down.

Interesting & gruesome fact

Sea urchins have five tiny teeth that can scrape algae—and these teeth never stop growing! They're basically living underwater cheese graters.

Its habitat

Found clinging to rocks and hiding in crevices. They love rocky areas with lots of algae to munch on.

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Harbour Crab

Liocarcinus depurator

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Harbour Crab

Liocarcinus depurator

What it eats

Small fish, crustaceans, and algae. It's an opportunistic eater with a big appetite.

How it breeds or multiplies

Males and females mate after the female molts her shell. The eggs are then carried under the female's abdomen.

Interesting & gruesome fact

Its swimming legs make it one of the fastest crabs in shallow water.

Its habitat

Sandy seabeds and shallow coastal waters.

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Hermit Crab

Pagurus bernhardus

NOAA - Public domain, via Wikimedia Commons

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Hermit Crab

Pagurus bernhardus

What it eats

Dead organic matter, algae, and tiny invertebrates. It’s the janitor of the rockpool, cleaning up leftovers wherever it goes.

How it breeds or multiplies

Mating involves the male carefully pulling the female out of her shell (romantic, right?) before fertilizing her eggs. The female then carries the eggs on her abdomen until they hatch into free-swimming larvae.

Interesting & gruesome fact

Hermit crabs don’t grow their own shells—they “borrow” empty ones from snails. When a hermit crab outgrows its shell, it hunts for a new one, sometimes engaging in shell swaps with other crabs. It’s a real-life game of musical chairs!

Its habitat

Rockpools, sandy shores, and anywhere there are empty snail shells to commandeer. They are opportunistic and can adapt to a wide range of intertidal environments.

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Honeycomb Worm

Sabellaria alveolata

Júlio Reis, CC BY-SA 3.0, via Wikimedia Commons

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Honeycomb Worm

Sabellaria alveolata

What it eats

Filters plankton from the water using its tentacle crown.

How it breeds or multiplies

Releases eggs and sperm into the water during summer.

Interesting & gruesome fact

Builds tubes from sand grains that join together to form honeycomb-like reefs—nature's architect!

Its habitat

Forms colonies on rocky shores, creating reef-like structures.

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Lesser Weever

Echiichthys vipera

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Lesser Weever

Echiichthys vipera

What it eats

Small fish and crustaceans. This little predator lies buried in the sand, waiting to ambush unsuspecting prey.

How it breeds or multiplies

Spawning occurs in the summer months. Females release eggs into the open water, which hatch into larvae and eventually settle on the seabed.

Interesting & gruesome fact

The lesser weever is venomous, with spines on its dorsal fin and gills that can deliver a painful sting. It’s the punk rocker of the rockpool, complete with dangerous spikes!

Its habitat

Sandy shores and shallow waters, often buried just beneath the sand with only its eyes and mouth visible. Watch your step when paddling!

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Long-spined Sea Scorpion

Taurulus bubalis

F. Dorsman, CC BY 3.0, via Wikimedia Commons

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Lumpsucker

Cyclopterus lumpus

Tiit Hunt, CC BY-SA 3.0, via Wikimedia Commons

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Lumpsucker

Cyclopterus lumpus

What it eats

Jellyfish, small crustaceans, and plankton. It’s not picky—it just loves things that float.

How it breeds or multiplies

Females lay eggs in clusters, and males fiercely guard them, fanning water over the eggs to keep them oxygenated. These dads take parenting seriously.

Interesting & gruesome fact

Its pelvic fins are modified into a suction cup, allowing it to stick to rocks and avoid getting swept away. A fish with super glue powers!

Its habitat

Cold, rocky shorelines and deeper waters, but occasionally ventures into rockpools.

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Masked Crab

Corystes cassivelaunus

Bernard Picton, CC BY 4.0, via Wikimedia Commons

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Masked Crab

Corystes cassivelaunus

What it eats

Buried crustaceans, worms, and detritus. It's a stealthy hunter that digs for its dinner.

How it breeds or multiplies

Males seek out females during the breeding season, and the eggs are carried under the female's abdomen until they hatch.

Interesting & gruesome fact

Its long, curved antennae help it breathe while buried in the sand, making it a master of disguise and stealth.

Its habitat

Sandy shores and shallow waters, often buried just below the surface.

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Montagu’s Blenny

Coryphoblennius Galerita

Roberto Pillon, CC BY 3.0, via Wikimedia Commons

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Montagu’s Blenny

Coryphoblennius Galerita

What it eats

Algae, barnacles, and small invertebrates. It’s an opportunistic diner, scraping away at whatever it can find on the rocks.

How it breeds or multiplies

Males prepare nesting sites in rock crevices, enticing females to lay their eggs. The male guards the eggs like a devoted sentinel until they hatch.

Interesting & gruesome fact

It’s named after Captain George Montagu, an 18th-century British naturalist who first described this curious fish. Montagu was known for his love of marine life—and possibly for being as feisty as the blenny that bears his name. This blenny also has a small, fleshy crest or “mohawk” on its head, which gives it a punk rock look and helps distinguish it from its relatives.

Its habitat

Prefers rocky shores and algae-rich areas, where it can easily find food and safe hiding spots. You’ll often spot it in the splash zone, even at low tide.

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Olive Squat lobster

Galathea squamifera

Akuppa, CC BY 2.0, via Wikimedia Commons

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Olive Squat lobster

Galathea squamifera

What it eats

The olive squat lobster (Galathea squamifera) is an opportunistic scavenger and filter feeder that eats a wide variety of dead and living plant and animal matter found on the rocky seafloor

How it breeds or multiplies

via internal fertilization after the female molts her shell. The male transfers sperm into a special receptacle on the female's abdomen using modified limbs. She then fertilizes her eggs, carries them externally under her tail using her swimmerets until they hatch, and releases free-swimming larvae into the sea.

Interesting & gruesome fact

The olive squat lobster is not a true lobster. It is actually a close relative of the hermit crab. When scared, it claps its tail hard to zoom backward and escape like a flash of magic. This quick trick gives it the fun nickname "Houdini of the rocky shore".

Its habitat

Olive squat lobsters live in marine environments, primarily inhabiting rocky shores, lower intertidal zones, and shallow coastal waters. They spend most of their time hidden away under loose stones, large boulders, and deep rock crevices.

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Painted Top Shell

Calliostoma zizyphinum

H. Zell, CC BY-SA 3.0, via Wikimedia Commons

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Painted Top Shell

Calliostoma zizyphinum

What it eats

Algae scraped off rocks with its radula—a tongue-like structure covered in tiny teeth.

How it breeds or multiplies

Releases eggs into the water, which develop into planktonic larvae.

Interesting & gruesome fact

Its brightly colored, cone-shaped shell makes it one of the most eye-catching mollusks in the rockpool.

Its habitat

Rocky shores, clinging to seaweed and stones.

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Pennants swimming crab

Portumnus latipes

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Pennants swimming crab

Portumnus latipes

What it eats

Feeds on small organic particles and tiny organisms in the sand

How it breeds or multiplies

reproduces in the wild during a winter-to-spring cycle on sandy marine beaches. Breeding requires the female to molt before mating, after which she carries developing eggs in stages (white, orange, then grey) under her abdomen before releasing planktonic larvae into the sea. They are marine and not captive-bred

Interesting & gruesome fact

a grim reality of their daily survival involves being crushed alive under the sand by beachgoers or unwittingly serving as live burial traps when exposed at low tide

Its habitat

shallow marine and coastal environments around Britain, Ireland, and the broader Northeast Atlantic

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Plaice

Pleuronectes platessa

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Plaice

Pleuronectes platessa

What it eats

Bottom-dwelling predator feeding on shellfish, worms, and crustaceans.

How it breeds or multiplies

Spawns in offshore waters during winter and spring.

Interesting & gruesome fact

Born swimming upright like normal fish, but one eye gradually moves to join the other on top—nature's transformer!

Its habitat

Sandy or muddy seabeds, often partially buried.

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Purple Laver

Porphyra umbilicalis

Gabriele Kothe-Heinrich, CC BY-SA 3.0, via Wikimedia Commons

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Purple Laver

Porphyra umbilicalis

What it eats

Photosynthesizes using sunlight, making it a self-sustaining plant powerhouse.

How it breeds or multiplies

Releases spores into the water, which grow into new plants. Nature’s seed spreader.

Interesting & gruesome fact

This seaweed is used to make laverbread, a traditional Welsh dish. Fancy some seaweed toast, anyone?

Its habitat

Shallow rockpools and coastal areas exposed to sunlight.

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Purple Sea Urchin

Paracentrotus lividus

Frédéric Ducarme, CC BY-SA 3.0, via Wikimedia Commons

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Purple Sea Urchin

Paracentrotus lividus

What it eats

Algae, detritus, and seagrass. It grazes like an underwater lawnmower.

How it breeds or multiplies

Releases eggs and sperm into the water for external fertilization.

Interesting & gruesome fact

Its spines are sharp enough to fend off predators, and it has a specialized mouth called Aristotle's lantern for munching through rock-hard algae.

Its habitat

Rocky pools and subtidal zones with plenty of algae.

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Rainbow Worm

Eulalia viridis

A. C. Tatarinov, CC BY-SA 4.0, via Wikimedia Commons

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Sand Mason Worm

Lanice conchilega

Seascapeza, CC BY-SA 3.0, via Wikimedia Commons

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Sand Sole

Solea solea

Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons

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Sand Sole

Solea solea

What it eats

Crustaceans, worms, and small fish. It hunts in the sand like a stealthy ninja.

How it breeds or multiplies

Spawns in deeper waters, with larvae floating in the plankton until they settle as juveniles.

Interesting & gruesome fact

It's flat body allows it to bury itself completely in the sand, leaving only its eyes exposed.

Its habitat

Sandy seabeds and shallow waters.

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Sea Fan Coral

Eunicella verrucosa

Santos Jubete Guillén, GPL, via Wikimedia Commons

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Sea Fan Coral

Eunicella verrucosa

What it eats

Plankton and tiny organic particles filtered from the water.

How it breeds or multiplies

Releases eggs and sperm into the water to form free-swimming larvae.

Interesting & gruesome fact

Its fan-like structure is so delicate that even a touch can damage it, making it a protected species.

Its habitat

Deeper subtidal areas with strong currents.

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Sea Girdle

Girdle of Neptune

no-image-available.png, CC BY-SA 4.0, via Wikimedia Commons

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Sea Hare

Aplysia punctata

Genny Anderson - CC BY-SA 4.0, via Wikimedia Commons

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Sea Hare

Aplysia punctata

What it eats

Seaweed, particularly red and green algae. It grazes like a tiny underwater cow, leaving neat little trails as it munches.

How it breeds or multiplies

Sea Hares are hermaphrodites and can mate with any other individual. They lay long, spaghetti-like egg ribbons on seaweed or rocks, ensuring the next generation gets a head start.

Interesting & gruesome fact

When threatened, they release a cloud of purple ink to confuse predators. The ink is harmless to humans but can make them disappear in an instant. An escape artist with style!

Its habitat

Shallow rocky shores with abundant seaweed. They love calm, sheltered rockpools where they can graze without too much disturbance.

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Sea Lemon

Archidoris pseudoargus

Vulpecula23, Public domain, via Wikimedia Commons

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Sea Lemon

Archidoris pseudoargus

What it eats

Sponges are its favorite food. A picky eater with expensive taste!

How it breeds or multiplies

Lays spiral ribbons of eggs that look like delicate lace.

Interesting & gruesome fact

Despite its name, it's not citrus-flavored! The name comes from its lumpy, yellow appearance.

Its habitat

Rocky shores and shallow waters, often found near its favorite food—sponges.

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Sea Lettuce

Ulva lactuca

Kristian Peters -- Fabelfroh 08:32, 12 December 2006 (UTC), CC BY-SA 3.0, via Wikimedia Commons

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Sea Lettuce

Ulva lactuca

What it eats

Nothing! Like all seaweeds, it photosynthesizes, soaking up sunlight to make its food. The original solar panel.

How it breeds or multiplies

Releases tiny spores into the water, which grow into new sea lettuce plants. Simple yet effective.

Interesting & gruesome fact

Sea lettuce is edible for humans and full of nutrients. But if it decays in large quantities, it can release gases that smell like rotten eggs. Dinner or disaster? You decide.

Its habitat

Shallow waters and rockpools with lots of sunlight. Look for its bright green, leaf-like fronds.

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Sea Potato

Echinocardium cordatum

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Sea Potato

Echinocardium cordatum

What it eats

Organic material buried in the sand. It's like a vacuum cleaner with spines.

How it breeds or multiplies

Males and females release eggs and sperm into the water, and the fertilized eggs settle into the sand.

Interesting & gruesome fact

Its heart-shaped shell is covered in tiny, furry spines. Cute, but also super creepy up close!

Its habitat

Sandy seabeds and shallow waters, they are often found just under the surface of the sand.

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Serrated Wrack

Fucus serratus

User:Stemonitis, CC BY-SA 2.5, via Wikimedia Commons

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Shore Clingfish

Lepadogaster lepadogaster

polandeze, CC BY 2.0, via Wikimedia Commons

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Shore Clingfish

Lepadogaster lepadogaster

What it eats

Tiny crustaceans and algae. It forages among rocks like a tiny treasure hunter.

How it breeds or multiplies

Females lay adhesive eggs under rocks, and males guard them until they hatch. Family values are strong with these little fish.

Interesting & gruesome fact

Its suction disc is so strong it can hold on even in strong tidal currents. It’s the rockpool’s version of a superhero’s grappling hook.

Its habitat

Rocky pools and intertidal zones, often tucked under rocks or clinging to surfaces.

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Shore Crab

Carcinus maenas

George Chernilevsky, Public domain, via Wikimedia Commons

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Shore Crab

Carcinus maenas

What it eats

Algae, mollusks, worms, and detritus. It's the scavenger of the shore.

How it breeds or multiplies

Females carry eggs (called a "berry") under their abdomen until they hatch into free-swimming larvae.

Interesting & gruesome fact

This crab can change its shell color slightly to match its environment, making it a master of disguise.

Its habitat

Rocky intertidal zones and sandy shores.

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Snakelocks Anemone

Anemonia viridis

Diego Delso , CC BY-SA 4.0, via Wikimedia Commons

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Snakelocks Anemone

Anemonia viridis

What it eats

Small fish and crustaceans that get caught in its stinging tentacles.

How it breeds or multiplies

Can reproduce by splitting in half or releasing eggs and sperm into the water.

Interesting & gruesome fact

Its tentacles contain stinging cells that paralyze prey, but they don't harm humans.

Its habitat

Rocky pools exposed to sunlight, often in shallow water.

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Spider Crab

Maja squinado

Govern de les Illes Balears, CC BY-SA 3.0, via Wikimedia Commons

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Spider Crab

Maja squinado

What it eats

Spider crabs are scavengers, munching on dead stuff, algae, and anything that doesn't run away fast enough. Think of them as the rockpool's cleanup crew.

How it breeds or multiplies

Spider crabs mate belly-to-belly (romantic, right?). Females carry thousands of eggs under their tails like tiny backpacks until they hatch.

Interesting & gruesome fact

Spider crabs are decorators—they stick seaweed, sponges, and shells onto their shells to blend in. But under all that bling, they're surprisingly squishy!

Its habitat

Shallow sandy areas or rocky pools. They're often found loitering under rocks or scuttling along like awkward underwater models.

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Spiny Starfish

Marthasterias glacialis

heartypanther, Public domain, via Wikimedia Commons

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Spiny Starfish

Marthasterias glacialis

What it eats

mussels clams, and other shellfish. It pries them open with its arms and stomach-slurps their insides. Gruesome but effective.

How it breeds or multiplies

Releases eggs and sperm into the water. The larvae drift with the currents before settling down and growing their iconic spiny shape.

Interesting & gruesome fact

Its spines are sharp enough to deter most predators, and it can regrow lost arms if attacked. It's basically the Wolverine of the rockpool.

Its habitat

Rocky seabeds and deeper tide pools, especially where shellfish are abundant. Look for them hanging out in mussel beds.

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Strawberry Anemone

Actinia fragacea

Nicolás Tamargo, CC0, via Wikimedia Commons

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Three-bearded Rockling

Gaidropsarus vulgaris

Gervais et Boulart, Public domain, via Wikimedia Commons

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Three-bearded Rockling

Gaidropsarus vulgaris

What it eats

Small crustaceans, worms, and fish eggs. It’s like the seafood buffet expert of the rockpool.

How it breeds or multiplies

Spawning occurs in spring and summer, with eggs released into the open water. The larvae drift with the currents until they’re big enough to settle down.

Interesting & gruesome fact

Its three chin barbels (whisker-like organs) act like feelers to help it find food in the dark. Think of it as a night-vision beard.

Its habitat

Rocky crevices and sandy seabeds, often hiding during the day and feeding at night.

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Tompot Blenny

Parablennius Gattorugine

Diego Delso - CC BY-SA 4.0, via Wikimedia Commons

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Tompot Blenny

Parablennius Gattorugine

What it eats

Small crustaceans, worms, and mollusks. It’s like a snack-loving rockpool gremlin, constantly foraging among the algae and stones.

How it breeds or multiplies

During the breeding season, males attract females to lay eggs in a crevice. The male guards the eggs with his life, fanning them to ensure they’re oxygenated. No slacking in the tompot parenting department!

Interesting & gruesome fact

Tompot Blennies have tufts of tentacle-like structures above their eyes, giving them a perpetually surprised look. They are bold little fish and will often investigate snorkelers and divers—rockpool paparazzi beware.

Its habitat

Found in rocky intertidal zones and tide pools. They love crevices and algae-covered rocks for both food and protection.

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Two-spotted Goby

Gobiusculus flavescens

bernardpicton, CC BY 4.0, via Wikimedia Commons

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Velvet Swimming Crab

Necora puber

Olivier Dugornay, CC BY 4.0, via Wikimedia Commons

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Velvet Swimming Crab

Necora puber

What it eats

Small fish, mollusks, and even carrion. These crabs are opportunists—if it's edible, they'll eat it.

How it breeds or multiplies

Females carry thousands of eggs under their abdomen, which hatch into tiny planktonic larvae. A proud mama crab moment.

Interesting & gruesome fact

Known as the "angry crab" for its aggressive nature, it waves its pincers like a boxer in a ring. It also has bright red eyes that give it a permanently evil glare.

Its habitat

Shallow waters with rocky or sandy bottoms. They're often seen swimming awkwardly backward like they've had too much seaweed wine.

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