Perch larvae (Perca fluviatilis L.) survive better in dilute sea water |
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Authors: | Georg Ribi |
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Institution: | (1) Zoologisches Museum, Winterthurerstrasse 190, 8057 Zürich, Switzerland |
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Abstract: | Larvae of perch (Perca fluviatilis L.) reared in tanks for 27 days survived better in lake water to which 2% of artificial sea water had been added (46.6% average survival rate) than in lake water only (13.5% survival). One week after hatching, over 90% of the larvae had their guts filled in all tanks. During the following week the populations divided into floaters (fish with an inflated swimbladder) and sinkers (fish apparently lacking a functional swim-bladder). Although they continued feeding, sinkers remained smaller than floaters and most of them died. |
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Keywords: | Perca fluviatilis fish larvae survival |
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