For centuries, people have puzzled over where eels come from. However, artificial dams and pollution are mowing their numbers down like reapers. Here, they metamorphose into finger-length, see-through miniature eels – called glass eels – to continue their journey inland. List of all endangered species (animals & plants). She describes how the eels instantly try to escape. long! It's just one of the many benefits of being a WWT member. But hopefully, as we learn more about them and take steps to make them more welcome, eels will keep coming back to our wetlands for many years to come.’. It all begins near the island of Bermuda in the deep, blue waters of the Sargasso Sea. Some were yellowy-green. The European eel (Anguilla anguilla) is a species of eel, a snake-like, catadromous fish. European Eel. We’re adopting a different technique to help eels migrate at WWT Castle Espie on the banks of Strangford Lough in Northern Ireland. As each tagged eel wriggles past the scanner, a chip will record its details, before it embarks on an epic migration thousands of miles back to the Sargasso Sea where it will breed, then die. Facts about Eels 5: European conger European conger is considered as the biggest true eels. This may be due to natural changes, overfishing, pollution and increasing obstacles to their migration in Europe's rivers.