Basic abiotic conditions for production of perch (Perca fluviatilis L.) young-of-the-year in the Gulf of Bothnia

A recruitment model for perch (Perca fluviatilis L.) was used to predict relative abundances of young-of-the-year in habitats with different degrees of exposure to the open sea in the Gulf of Bothnia. The model describes the most basic conditions influencing the recruitment process, namely the influ...

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Bibliographic Details
Published in:Annales zoologici fennici 1996-01, Vol.33 (3/4), p.371-381
Main Author: Karaas, P
Format: Article
Language:English
Subjects:
Archipelagos
Early life stages
Freshwater fishes
Growing seasons
Gulfs
Marine
Modeling
Mortality
Perca fluviatilis
Quarks
Seas
Water temperature
Wildlife habitats
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Summary:A recruitment model for perch (Perca fluviatilis L.) was used to predict relative abundances of young-of-the-year in habitats with different degrees of exposure to the open sea in the Gulf of Bothnia. The model describes the most basic conditions influencing the recruitment process, namely the influence of day-length and temperature on consumption affecting the growth potential. First year growth in these waters is positively correlated with year-class strength, thus, the size at the end of the first growth season is in the model used as an index of recruitment. The predictions were compared with observations during surveys regarding growth, distribution and abundance. As verified by the survey results, recruitment success should be very low in the most exposed habitats due to a low potential for first-year growth. Only sheltered bays and archipelagos, estuaries and small freshwaters provide favourable conditions for production of recruits in the Gulf of Bothnia. As predicted by the model, recruitment areas with the highest basic quality, the highest temperatures, had the widest extensions in the archipelagos.
ISSN:0003-455X
1797-2450