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Effects of larval density and salinity on the development of perch larvae (Perca fluviatilis L.)
Authors:René Bein  Georg Ribi
Institution:(1) Zoologisches Museum, Winterthurerstrasse 190, 8057 Zürich, Switzerland
Abstract:We performed two experiments, one to test whether survival and initial swim bladder inflation of perchPerca fluviatilis are affected by population density (4 or 16 larvae 1–1) or salinity (0permil, 0.6permil and 1.2permil), and the second to test the salinity tolerance of larvae. In experiment 1, survival was higher at low larval densities and at salinities of 0.6permil and 1.2permil rather than in fresh water. Initial swim bladder inflation was not affected by salinity or density. Average survival of fry 24 days after hatching varied from 29.6% to 86.3%, but only an average of 19.2% of the hatched larvae had grown into viable fish with an inflated swim bladder. In experiment 2, survival varied from 19% to 49%, but was not significantly affected by salinities of up to 4.8permil. At a salinity of 9.6permil, only 2 out of 344 larvae survived.
Keywords:Density effect  fish larvae  Perca fluviatilis  salinity  survival
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