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The material was collected in the spring-summer period of 1993 and 1995-96. Ninespine stickleback is abundant in the brackish waters of the Puck Bay and its catchment area. The species is common in the overgrown littoral zone. Spawning in the bay is extended, lasting from March to August, the ggs are laid in batches. The fecundity of these fish is relatively low, as with others which show parental care. Sticklebacks lay up to 199 eggs, this being higher than the fe­ cundity of sticklebacks from North America and Eastern Europe and lower than in one of the Japanese forms. The re­ lation between absolute fecundity and body length, and bodx weight is described be?.; the equations: F = 1.8052· 103·L 2 1 and F = 103.77551 · W ·99, respectively. The fecundity of a fish depends primarily on its weight. The body size and fecundity had no effect on egg size.

Fecundity of ninespine stickleback (Pungitius pungitius L., 1758) in the Puck Bay