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Light intensity affects growth and sexual maturation of Atlantic salmon (Salmo salar) postsmolts in sea cages

Published online by Cambridge University Press:  15 November 1997

Frode Oppedal ,
Geir Lasse Taranger ,
Jon-Erik Juell ,
Jan Erik Fosseidengen  and
Tom Hansen
Frode Oppedal
Affiliation:
Institute of Marine Research, Dept. Aquaculture, Matre Aquaculture Research station, N-5198 Matredal, Norway
Geir Lasse Taranger
Affiliation:
Institute of Marine Research, Matre Aquaculture Research Station, N-5198 Matredal, Norway
Jon-Erik Juell
Affiliation:
Institute of Marine Research, PO Box 1870, N-5024 Bergen, Norway
Jan Erik Fosseidengen
Affiliation:
Institute of Marine Research, PO Box 1870, N-5024 Bergen, Norway
Tom Hansen
Affiliation:
Institute of Marine Research, Matre Aquaculture Research Station, N-5198 Matredal, Norway
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Abstract

The aim of the present study is to test the extent to which different intensities of continuous additional light affect somatic growth and sexual maturation in Atlantic salmon postsmolts in sea cages. Postsmolts (9 200 individuals) were randomly distributed among four commercial sized sea cages and exposed to either natural light or natural light + continuous additional light of low, medium or high intensity from January to June. In May the high light intensity group had a signiticantly higher mean live body weight than the other groups, and at the end of the experiment in June, all groups differed in mean gutted weight. There was apositive logarithmic regression between level of light intensity exposure during night and mean gutted weight. A small proportion of fish matured sexually (after 1.5 years in seawater) in the natural light group, whereas no maturation was detected in the light groups. These results suggests that to affect growth and proportion or maturation in Atlantic salmon by additional light, there might be different threshold values of light intensity.

Keywords

Salmo salarpostsmoltgrowthsexual maturationlight intensityphotoperiodSalmo salarpost-smoltscroissancematurité sexuelleintensité lumineusephotopériode
Type
Research Article
Information
Aquatic Living Resources , Volume 10 , Issue 6 , November 1997 , pp. 351 - 357
Copyright
© IFREMER-Elsevier, Paris 1997

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