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Also known as Ninespine Stickleback, this fish is a member of the Stickleback family, with, yes, nine dorsal spines on its back. It grows to lengths of only 8 cm and is greyish above with silver below. During Summer mating season males change colour slightly to a reddish tone. The male builds a rounded nest, then seeks out a female and lures her to it. where she will lay 20-30 eggs. The female is then chased away by the male, who then fertilizes the eggs and assumes all incubation and guard duties. It is prey for Brook Trout, Lake Trout, and Walleye.
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