Control of spawning time in rainbow trout, Salmo gairdneri, using constant long daylengths

Control of spawning time in rainbow trout, Salmo gairdneri, using constant long daylengths

Male and female rainbow trout ( Salmo gairdneri) were placed under a constant daylength of 18 h light : 6 h dark from some time before, or immediately after, their normal spawning season. This induced them to spawn again approximately 6 months later (i.e., 6 months earlier than normal). This was obs...

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Veröffentlicht in:Aquaculture 1984-01, Vol.43 (1), p.225-233
Hauptverfasser: Scott, A.P., Baynes, S.M., Skarphédinsson, O., Bye, V.J.
Format: Artikel
Sprache:eng
Schlagworte:
aquaculture
Freshwater
induced breeding
photoperiod
photoperiods
reproductive cycle
Salmo gairdneri
sexual reproduction
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Beschreibung
Zusammenfassung:Male and female rainbow trout ( Salmo gairdneri) were placed under a constant daylength of 18 h light : 6 h dark from some time before, or immediately after, their normal spawning season. This induced them to spawn again approximately 6 months later (i.e., 6 months earlier than normal). This was observed under laboratory and farm conditions and may form the basis of a simple system for obtaining out-of-season eggs. A hypothesis is presented to explain this phenomenon.
ISSN:0044-8486
1873-5622
DOI:10.1016/0044-8486(84)90024-3