Sticklebacks

Various sharp spines run in the back of the proposed small fish. They protect the stickleback by sticking in a predator’s mouth, making it hard for them to be swallowed.

One of the courses in which sticklebacks might be differentiated one from the other is by the number of spines in their back. The most broadly conveyed species is the threespined stickleback. Unlike most fish, it can be found living in both fresh water and salt water throughout its range. However, the fish’s name is not always an accurate indication of the number of spines on its back. For example, the nine-spined stickleback has between six and twelve spines on its back; to add to the confusion, it is also known as the ten-spined stickleback.

Nest-building

Male sticklebacks build territories at rearing time, which they will shield vigorously. They construct a tunnellike home with strands of sea-going vegetation moored as a single unit utilizing a uncommon gluey material made by their kidneys. Once the nest-building is complete, the male attracts a mate by means of spectacular dancing displays,with plump females seeming to be the most desirable. Each female may lay up to 600 eggs,with several in succession often visiting the nest.

The male then guards the eggs until hatching begins after a week or so. The young sticklebacks remain close to the nest for a similar period of time, being watched over by their father until they leave to live on their own.