Dive Magazine has launched a quick reef ecology quiz that asks one simple question: how well do you actually understand what's going on beneath the surface when you're snorkelling or diving over a coral reef? It's a one-minute read and an interactive test, aimed at anyone who has ever floated over a reef and realised they could name maybe three of the hundred species around them.

Why does that matter for travellers? Because reefs are among the most complex ecosystems on the planet, and knowing a little of how they work transforms a swim from 'pretty fish' into something far more interesting. A reef is essentially a city built by animals — corals are creatures, not rocks, and they survive through a symbiotic relationship with microscopic algae living in their tissue. That partnership is also what makes corals so vulnerable: when water temperatures rise, the algae are expelled and the reef bleaches white.

Once you know the basics, the whole scene reorganises itself. The flashy butterflyfish pecking at coral, the parrotfish crunching rock and excreting sand, the cleaner wrasse running a service station for large groupers — every behaviour is part of a system. Many divers find that learning even a handful of these relationships is the single biggest upgrade to their time underwater, better than any new piece of kit.

The quiz is also a gentle nudge towards more responsible reef travel. Reefs worldwide are under pressure from warming seas, pollution and physical damage, and poorly informed visitors are part of that equation. Touching coral, standing on it, or stirring up sediment with careless fins can kill polyps that took decades to grow. Choosing reef-safe sunscreen, keeping neutral buoyancy, and booking with operators who brief guests properly all make a real difference — and understanding the ecology is what motivates people to bother.

So who is this for? Anyone planning a trip to reef territory — the Red Sea, the Great Barrier Reef, Southeast Asia, the Caribbean — especially first-time snorkellers and new divers who want more from their holiday than a GoPro full of unidentified fish. It's a fun pre-trip warm-up: take the quiz before you fly, see what you don't know, and read up on the gaps. Your dive guide will appreciate the company, and you'll get a lot more out of every descent.

For travellers who get hooked, the next step is often a naturalist specialty course — PADI, SSI and BSAC all offer short fish identification and reef ecology programmes that can be completed during a holiday. But you don't need a certification to start. A free quiz, a bit of curiosity and a mask are enough to change how you see the reef. Head over, have a go, and see how you score — no cheating with the fish ID card.

Quiz via Dive Magazine.