Glass eels will use the tides to migrate into river systems and marshes, trying to expend as little energy as possible.
Big Spring tides in March, April and May will deliver many millions of young eels to our estuaries and rivers under
cover of darkness. These eels, using the tides to leap-frog upstream, may be the progeny of parents from Sweden,
Germany, Italy or any other eel-generating European country.
As with the elver, yellow eel and silver eel life stages, the glass eel is vulnerable to a range of man-made and natural
hazards which reduce the numbers that actually arrive and settle in our river systems considerably.