Three-spined Stickleback

Gasterosteus aculeatus

This is a small fish sometimes called a ‘Tiddler’, with 2 to 4 dorsal spines (usually 3 spines), just in front of the dorsal fin. Larger fish are discouraged from swallowing Sticklebacks because of those dorsal spines which can be sharp and locked erect. A favourite quarry of children with fishing nets in small pools, they hover and dart about in open water and are usually quite easily spotted and caught. It has a torpedo-shaped body which narrows towards the tail,  which is either mottled brown or greenish, being silvery underneath. During the breeding season the male has a red underbelly and a bluish dorsal sheen. Length 4 to 7 cm.

It is a fierce carnivore which feeds mainly on invertebrates, but it will also eat tadpoles. The male attracts the female to courtship with his bright red underbelly and by doing a courtship dance. He will build a nest with vegetation in which the female will lay up to 400 eggs. He will then defend the nest from predation, and will fan the eggs to ensure a plentiful supply of oxygen. After the eggs have hatched 4 weeks later he will protect the small fry and teach them how to defend themselves against predation. They can live up to 5 years.

It can live in brackish water, freshwater or salt water environments, including freshwater rivers and streams, freshwater ponds, lakes and ditches, and in coastal habitats like estuaries and harbours. A common and widespread species throughout Britain.

Photographs taken August 2015, country park pool, Staffordshire.

Your thoughts ...

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.