Logo

Estuary rock pooling is a different sort of day out

The open coast gets the glory, but an estuary offers something a granite headland cannot: shelter. Water inside a river mouth is calmer, shallower and warms faster in early summer, which means small children can potter about without being knocked off their feet by swell. The trade-off is mud. An estuary foreshore is a mix of rock, gravel, sand and soft ooze, and the pools hidden between them are often richer in life than anything on the exposed shore.

Much of the rock is man-made, too — old quay walls, breakwater stone, the remains of landing stages and causeways. Build the habit of looking at the join between stone and water rather than the middle of the beach, and you will find crabs, prawns and blennies within minutes.

Start with the tide, not the bucket

Low water is your friend, but not all low waters are equal. Check the tide table for your estuary — harbour noticeboards and local tide tables publish times, and the difference between a spring and a neap tide is the difference between a wide, gentle foreshore and a fast, fussy one.

• Neap tides expose less rock, but the water moves gently. Best for toddlers and first-timers.
• Spring tides expose the most, including rarely seen lower-shore pools — but the tide returns quickly and the run of water up a narrow channel can be alarming.
• Aim to arrive about two hours before low water and leave the shore within an hour of it turning.

Never let a pool distract you from looking behind you. In an estuary the flood tide can creep round a sandbank and cut off the route you walked in by. Pick an exit point you can see at all times, and set a phone alarm for twenty minutes before you mean to leave.

What to take, and what to leave at home

Keep it light, because you will be carrying it across wet stone.

• Footwear with grip — wellies are fine on gravel, but soft-soled wetsuit boots or old trainers hold better on weed-covered rock.
• Two small tubs, not one big bucket. Half-filled tubs are easier for children to carry and less likely to cook their contents in the sun.
• A soft net and a white plastic tray — a pale tray makes tiny shrimp and gobies instantly visible.
• A folding guide to seashore life, a magnifier and a small notebook.
• Sun hats, water, a towel and a full change of clothes. Estuary mud travels home in car seats.

Leave glass jars, heavy buckets and anything you would be upset to lose. A thin pair of gloves helps if you are turning stones for crabs, though most estuary species are harmless.

Where to look along the estuary

You do not need a famous location — you need the right structure. These are the features worth seeking out on any estuary.

• Sheltered harbour walls and slipways. Constant shade, weed and encrusting life. Look for beadlet anemones and periwinkles in the damp band just above the waterline.
• Causeways, breakwaters and stone at the estuary mouth. More exposed, so more truly marine species, including prawns, squat lobsters and small flatfish in the lower pools.
• Old oyster quays and landing stages. Many estuaries have a history of shellfish beds, and the remains of working quays make excellent, well-drained pools.
• Rocky outcrops at the edge of saltmarsh. Quieter water, but check the channels between — gobies and juvenile fish use these as nurseries.
• Stone groynes and pier bases. Best visited on a neap tide, when the current past them is manageable.

Ask locally before you go. A harbourmaster, a bait shop or a village museum will usually tell you which stretch is safest with children and which has the softest mud.

What you will find, and how to treat it

Shore crabs, edible crabs, common prawns, blennies, gobies, beadlet and snakelocks anemones, limpets, mussels, dog whelks and barnacles are all realistic finds. In summer you may turn up a pipefish, a baby flatfish or a mermaid's purse — the egg case of a skate or ray.

The code is simple and worth teaching properly:

• Wet your hands before handling anything, and never pick up a creature by its shell or tail.
• Keep animals in water, in the shade, for a few minutes only.
• Turn stones back exactly as you found them — the underside is somebody's home.
• Return everything to the pool it came from, and take nothing living home.

The history under your feet

Estuary foreshores are working landscapes with layers of history. The stone you are standing on may be ballast from a trading ship, the dressed edge of a Victorian quay, or rubble from a wartime defence. Look for copper nails in old timbers, iron rings set into walls, rails from a horse-drawn tramway and the dark ribs of hulks abandoned in the mud.

Oyster dredging, ferry crossings, salt making and fishing all shaped these shores, and most estuary villages have a heritage board or a small museum that explains what you are looking at. It makes a good half-hour at the end of a morning's pooling, particularly with a flask.

Back at home, rinse nets and boots in fresh water, spread the guide out on the kitchen table and let the children draw what they found. A home near the water rewards this sort of slow, curious morning more than any expensive day trip — and the tide will bring a new set of pools tomorrow.