First feeding of Atlantic salmon (Salmo salar L.) under different photoperiods
- 1 August 1992
- journal article
- Published by Hindawi Limited in Journal of Applied Ichthyology
- Vol. 8 (1-4) , 251-256
- https://doi.org/10.1111/j.1439-0426.1992.tb00691.x
Abstract
Summary Juvenile Atlantic salmon (Salmo salar L.) were first fed under four different static photoperiods (LD 24:0, LD 21:3, LD 18:6, LD 12:12) in two experiments. Under LD 24:0, continuous feeding or feeding 12 hours per day did not affect growth rate. In both experiments the roup on continuous light (LD 24:0) had highest growth rate. Growth was reduced on reduced dayfength. It is suggested that the difference in growth between long day (LD 21:3) and continuous light (LD 24:0) was caused by a growth inhibition during the dark period. Zusammenfasung Erste Nahrung des Atlantischen Lachses (Salmo salar L.) Jungfische des atlantischen Lachses (Salmo ralar L.) wurden unter vier verschiedenen Photoperioden in zwei Experimenten erstmals gefüttert (LD 24:0; LD 21:3; LD 18:6; LD 12:12). Bei kontinuierlicher Fütterung (LD 24:0) oder Fütterung über 12 Stunden pro Tag, war die Wachsturnsrate nicht beeinflußt. In beiden Exerimenten hatte die Gruppe, die unter durchgehender Beleuchtung aufgezogen wurde, die höchste Wacgstumsrate. Das Wachsturn war bei kürzerer Tageslänge reduziert. Aus den Daten wird geschlossen, daß die Differenz im Wachstum zwischen dem Langtag (LD 21:3) und der durchgehenden Beleuchtung (LD 24:0) durch eine Wachtumshemmung während der Dunkelzeit verursacht wurde.Keywords
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