Stickleback

[Sarah]

Any one of numerous species of small fishes of the genusGasterosteus and allied genera. The back is armed with two or moresharp spines. They inhabit both salt and brackish water, andconstruct curious nests. Called also sticklebag, sharpling, andprickleback.

[Sarah]

Small fish, often caught in a [beck] by children in Yorshire.

[PussyCat]

A small fish with sharp spines along its back, able to live in both salt and fresh water and found in both Eurasia and North America.