If certain plants or animals disappear, like this handsome kingfisher, it could be a warning sign that the habitat is in danger. Gravel pits Many old industrial gravel pits have been flooded and stocked with fish. Carp, bream, tench and pike all grow to a good size in these deep waters. Heavy weed growth means there is plenty of food for the fish. An estuary is the stretch of water where a river meets the sea.
Harbours are great for fun fishing.
There are three main kinds of fishing.