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Food Preference of Perch ( Perca fluviatilis ) Stocked in a Previously Fishless, Acid Bog Lake and Development of the Fish Population in Absence of Piscivory
Author(s) -
Ronneberger Diethelm,
Anwand Karl
Publication year - 2000
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/1522-2632(200008)85:4<423::aid-iroh423>3.0.co;2-#
Subject(s) - perch , fish <actinopterygii> , population , biology , fishery , population decline , pike , ecology , demography , sociology , habitat
The almost fishless, acid Lake Fuchskuhle was physically partitioned into 4 sections and stocked with young, 10‐ to 13‐cm perch. Their body growth was normal only up to age 4 years. Although the perch spawned successfully, reproduction was negligible because only few offspring survived the first year of life. Food for young perch was plentiful, benthic invertebrates composing the main source. Because the population included only 2 to 3 year classes, the perch could not shift from benthic feeding to piscivory as they grew. As a result, growth rate decreased in older fishes (over 4–5 years old). The benthic food supply alone could not satisfy the energy requirements of the older perch.