Effect of amino acids on the swimming activity of newly hatched turbot larvae (Scophthalmus maximus) |
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Authors: | A O Kasumyan M Ryg K B Døving |
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Institution: | (1) Department of Ichthyology, Biological Faculty, Moscow State University, 119 899, Moscow, Russia, RU;(2) Institute of Aviation Medicine, P.O. Box 14 Blindern, N-0313 Oslo, Norway, NO;(3) Section of General Physiology, Department of Biology, University of Oslo, P.O. Box 1051, N-0316 Oslo, Norway, NO |
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Abstract: | The swimming behaviour of newly hatched turbot (Scophthalmus maximus L.) larvae was observed in artificial seawater (ASW) and in solutions of 21 l-amino acids at a concentration of 10−5
M. The behaviour of 20 larvae was analysed in each solution. Each larva was observed for 1 min. Individual movements were recorded
on video and analysed using a computer-assisted program. The larvae swam in convoluted, randomised three-dimensional paths,
rested and started swimming again. There were large variations in the swimming behaviour of turbot larvae during ontogeny.
In ASW the mean frequency of trajectories longer than a body length of 4 mm larva−1 min−1 increased from 1.2 at Day 1, to 10 at Day 4. Analysing the data (Dunnett's method) revealed that the frequency of swimming
trajectories increased in the presence of glycine, histidine and glutamine, and decreased in the presence of proline. The
total distance swum increased for glycine but decreased for proline. The threshold concentration for glycine detected by turbot
larvae was 10−5
M. The straightness index did not change in the presence of the amino acids. The possible role of these changes in behaviour
is discussed.
Received: 12 June 1997 / Accepted: 13 January 1998 |
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