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The paper describes results of the otolith analysis of five-bearded rockling (Ciliata mustela L.) of the Wadden Sea origin. The length growth rate of five-bearded rockling was determined. Moreover the accurate method of mathematical characterization of this fish growth was found out by means of non-asymptotic growth model.
Growth rate (based on fry length measurements and back calculations), condition, relative gonad size, and length at first maturity were determined in the common bream population inhabiting Międzyodrze, a deltaic area situated in the vicinity of Szczecin.
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 eggs 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 fecundity...
Background. Aparasitological survey was carried out in a shallow, eutrophic Oświn Lake (north-eastern Poland), within the Seven Islands ornithological reserve. We intended to compare the occurrence of eyeflukes in fish from two, distinctly demarcated pools of the lake, differing in environmental conditions. The effect of fish size and sampling season on the infection parameters was analysed and the...
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