The cycle of gonad development and related changes in the length structure and
spatial-temporal distribution of ninespine sticklebacks (Pungitius pungitius L.)
in Puck Bay were studied. Observations were carried out in the shallow shore
zones, as well as in the deeper epipelagic zone of the Bay. Ninespine sticklebacks
reproduce in the brackish environment of Puck Bay, breeding in its warmer, inshore
zones. Reproduction takes place in the spring and summer months, from April to
July. One female spawns several clutches of eggs during one breeding season. The
average length of ninespine sticklebacks in Puck Bay was about 40 mm, and the
sex ratio in the population was close to 1:1. However, both length structure and
sex ratio were subject to local and periodic variations, resulting from possible
breeding-related territorial divisions. Higher gonadosomatic indices in females in
early spring represented the transition of fish to the advanced vitelligenous phase.
The lowest GSI of males during the breeding season indicated the termination of
spermatogenesis. The completion of spawning in August started a new process of
gonad restoration to prepare the fish for the next breeding season.
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