Rockpooling for Beginners: Creatures and Care

What Makes a Good Rockpool?

Britain has thousands of miles of coastline, and a generous share of it is rocky. That means on almost any low tide, somewhere within reach of a car park or a coastal path, a small self-contained world is sitting quietly under a sheet of water, waiting to be noticed. Rockpooling is one of the most accessible forms of wildlife watching we have: no permit, no expensive kit, and no need to be quiet or patient in any theatrical way. All it really asks is the right shore, the right hour and a willingness to crouch until your knees complain.

Not every pool is worth a second look. The richest ones sit on the middle and lower shore, on ground rugged enough to hold water when the sea pulls back — ledges, deep gullies, boulders matted with weed. Exposed coasts where Atlantic swell keeps moving water through the pools, such as west Cornwall, Pembrokeshire, the Hebrides and the north-east of England, tend to carry the greatest variety, because that constant surge delivers food and oxygen. Sheltered estuaries and sandy bays offer less, though a single stone in a muddy bay can still hide a dozen winkles. As a rule, choose pools with something growing in them: where there is weed, there is almost always life.

Tide Times: When the Shore Opens Up

Everything depends on the tide. The shore is truly yours for roughly two hours either side of low water, and the best days are spring tides — the bigger fortnightly tides around the new and full moon, when the sea retreats furthest and exposes pools you would never see otherwise. Neap tides are disappointing; the lower shore simply stays under water.

Check a local tide table the evening before, then plan your visit:

• Arrive about an hour and a half before low water, while the sea is still dropping.
• Move down the shore as the tide falls. The lowest pools are the best ones, and you have to earn them.
• Turn back around low water rather than lingering, so you are never hurrying over slippery weed ahead of a rising sea.
• Watch the wind as well as the table. A strong onshore breeze can push water in faster than the predicted times.
• Never turn your back on the sea for more than a few minutes.

Common Creatures and How to Spot Them

The secret to finding animals is stillness. Sit or crouch at the edge of a pool and wait; within a minute or two, the residents that fled at your arrival will drift back out.

• Beadlet anemones — dark red or green blobs on rock walls. Out of water they look like lumps of jam; submerged, they open into a crown of tentacles. Touching one gently shows how it withdraws, but do not make a habit of it, as each contact costs the animal energy.
• Shore crabs — mottled green-brown, rounded shell, famously bad tempered. Look under stones and among weed at the pool edge.
• Hermit crabs — you will usually spot the shell first, trundling along as though late for something. Wait for a pair of legs to appear.
• Limpets and periwinkles — limpets clamp to rock like suction cups and should be left alone. Winkles and top shells graze among the weed and are easy to watch without being moved.
• Blennies and gobies — small darting fish, often on the pool floor or tucked beneath a ledge. Stay still and they will reappear.
• Dog whelks — pointed spiral shells, often pale with dark bands, which drill into other shells to feed.
• Starfish and brittlestars — mostly on the lower shore, and mostly in the west and north.

Seaweeds: The Garden of the Pool

Seaweed does the heavy lifting in a rockpool. It shelters small animals, produces oxygen and holds the whole community together. Learn a handful of species and the shore starts to make sense. Bladderwrack, with its paired air bladders, and knotted wrack mark the middle shore. Sea lettuce is bright green and translucent, often draped over stones. Coralline algae forms pink, chalky crusts on rock and on the stems of other weeds. Lower down, oarweed and kelp lie flat across the rocks at low tide, their holdfasts packed with worms and tiny crustaceans.

If you lift a frond of weed, do it gently and put it back as it was. That tangle is somebody's house, and it dries out fast in the sun.

Handling Rules: Look, Lift, Let Go

A little care goes a long way, and it is worth remembering that you are the largest and most disruptive thing in the pool.

• Wet your hands before touching anything. Dry hands and sunscreen damage the protective mucus on fish and anemones.
• Never prise a limpet or anemone off a rock. You will injure it, and it will not survive.
• Scoop crabs with a flat hand from underneath rather than grabbing them from above, and support them.
• If you turn a stone, put it back the same way up, in the same spot. The underside is a different habitat from the top.
• Keep any creature out of water for the shortest possible time. If you use a bucket, keep it shaded and cool, never in direct sun, and return everything within minutes.
• Put animals back exactly where you found them. A crab moved to the wrong part of the shore may not survive the next tide.

Kit, Safety and Leaving No Trace

Wear old trainers or wellingtons with real grip; wet weed on rock is genuinely treacherous, and smooth-soled wellingtons are a liability. Take a small plastic tub rather than a bag, a hand lens if you have one, and a towel. Barnacles and mussels cut skin easily, so watch your hands, and be aware of jellyfish and the small, well-camouflaged weever fish, whose spines are painfully venomous. Tell someone where you are going and check the weather before you set out.

On collecting, the general principle is straightforward: look, do not take. Most shore creatures are best left where they are, and many sites — nature reserves, marine conservation zones and sites of special scientific interest — have their own restrictions, while sea fisheries byelaws cover anything you might be tempted to eat. Photographs last longer than a jar of seawater anyway. Leave the shore as you found it, take your litter home, and the next person — or the next tide — will find the same small, busy world waiting.