Spawning stock-recruitment relationship in pikeperch Sander lucioperca (L.) in the Baltic Sea, with temperature as an environmental effect
Heikinheimo, Outi; Pekcan-Hekim, Zeynep; Raitaniemi, Jari
The pikeperch (Sander lucioperca) is an important target species for commercial and recreational fisheries in the Archipelago Sea, off the southwestern coast of Finland. Wide fluctuations in the year-class strength of pikeperch are linked to summer temperatures, but the role of the biomass of the spawning stock has not previously been examined. In this study, a stock-recruitment relationship with temperature as an environmental variable was fitted to stock assessment data based on a long time series of catch statistics and commercial catch samples. The mean water temperature in July-August was the most important factor determining the year class strength. The results indicate that there is also a density-dependent effect: the number of recruits produced per unit of spawning stock biomass decreases with a growing spawning stock. The coefficient of determination of the stock-recruitment model was close to 0.8. The stock-recruitment relationship is important for predicting the future year-class strength of pikeperch under different scenarios such as climate change, and for modeling the effects of fishing or fisheries management. (C) 2014 Elsevier B.V. All rights reserved.
Sander lucioperca; Stock assessment; Population dynamics; Stock-recruitment relationship; Temperature; Baltic Sea
2014, Volume: 155, pages: 1-9
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