Anglesey Sea Zoo is the largest aquarium in Wales and, for families, one of the most dependable days out on the island — especially when the weather turns. It sits at Brynsiencyn on the southern shore of the Menai Strait, looking across to the mountains, and everything in its tanks is native to British and Welsh waters, which makes it a genuine window onto the marine life living just offshore. Here’s how to make the most of it.
What you’ll see
The Sea Zoo focuses on the creatures of the Strait and the Irish Sea rather than tropical spectacle, and it’s the better for it:
- Seahorses — the zoo is a centre for seahorse breeding and conservation, and the seahorse tanks are a highlight for children.
- The lobster hatchery — a working conservation project rearing native lobsters to restock Welsh waters; you can see the tiny juveniles.
- Rays and small sharks — including a touch-friendly approach to some species, with talks through the day.
- The Big Fish Forest and shipwreck tanks — bigger displays recreating Strait habitats, plus conger eels, rays, and shoaling fish.
Daily talks and feeds are the best bits — check the board on arrival and time your visit around them.
Good to know before you go
- Tickets: book online ahead in school holidays, where it can save time and money; check current prices on the day as they change seasonally.
- Time: allow 2–3 hours; longer with the outdoor play area and if you catch several talks.
- Indoors and out: the main aquarium is indoors (so it’s a strong rainy-day option), with an outdoor adventure play area and crazy golf that need dry weather.
- Food: there’s an on-site café; you can also picnic.
- Accessibility: the main route is largely flat and step-free — see accessible Anglesey.
Combine it with
The Sea Zoo sits in a good cluster for a family day in the island’s south. Foel Farm Park is just along the coast for animal feeding and tractor rides, and Halen Môn — the famous Anglesey sea salt — runs from the same shoreline with tours. For more ideas, see Anglesey with kids, and if you want wildlife in the wild rather than in tanks, pair it with where to see seals or a Puffin Island boat trip.
Best time to visit
Term-time weekdays are quietest. In summer, arrive at opening to beat the coach parties and catch the morning feeds; in winter, check opening days before you travel, as hours reduce off-season — see Anglesey in winter. A wet forecast is, ironically, the perfect Sea Zoo day.