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Maximum daily ration of juvenile fish fed on living natural zooplankton
Author(s) -
Marmulla G.,
Rösch R.
Publication year - 1990
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1990.tb05628.x
Subject(s) - rutilus , biology , zooplankton , leuciscus , juvenile , perch , body weight , zoology , dry weight , fishery , fish <actinopterygii> , ecology , botany , endocrinology
Juveniles of five species of cyprinids of body length 15–90 mm as well as juvenile perch, Perca fluviatilis L., were fed on living natural zooplankton over periods of 2 or 3 days. For all species the correlation of the daily ration (% body weight) with body weight showed a maximum curve. The maximum was reached at a body weight (wet weight) of 0.6 g for Leuciscus leuciscus (L.) and 0.1 g for a group consisting of varying numbers of Rutilus rutilus (L.), Abramis brama (L.) and Alburnus alburnus (L.). For L. leuciscus , the maximum was 220% body weight (wet weight), corresponding to 40% on a dry weight basis. For the mixed species group the maximum was about 500% (wet weight) and about 140% on a dry weight basis. The highest daily ration coincided with the occurrence of the spring bloom of zooplankton.