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Regulation of Biomasses of Small (<41 cm) Northern Pike ( Esox Indus L.), with Special Reference to the Contribution of Individuals Stocked as Fingerlings (4–6cm)
Author(s) -
Grimm M. P.
Publication year - 1983
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1983.tb00062.x
Subject(s) - pike , esox , biology , stocking , predation , biomass (ecology) , population , fishery , ecology , demography , fish <actinopterygii> , sociology
The composition and abundance of four northern pike ( Esox lucius L.) populations were monitored in the period 1974–82. The biomasses of 0+ pike, pike <35 cm and pike <41 cm were negatively correlated with those of larger individuals following an exponential relationship. It is argued that this density‐dependent relation is the result of a regulation in which intraspecific predation may play a major role. The standing stock of pike <54 cm, if related to pike habitat available, was very similar both among sites within years and among years within sites. This stock is tied to a maximum per unit of vegetated area. Within this maximum the biomass of pike <41 cm is determined by the biomass of larger individuals. Therefore stocked pike did not contribute extra biomass to the population.