Daily feeding rhythms in Atlantic salmon I: feeding and aggression in parr under ambient environmental conditions
Daily feeding patterns of tank‐reared Atlantic salmon Salmo salar parr under ambient conditions and their relationship with patterns of aggression were investigated during spring and autumn. A single, early afternoon feeding peak was observed during spring but no consistent pattern emerged from the...
| Published in: | Journal of Fish Biology |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1997
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1997.tb01357.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1997.tb01357.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1997.tb01357.x |
| Summary: | Daily feeding patterns of tank‐reared Atlantic salmon Salmo salar parr under ambient conditions and their relationship with patterns of aggression were investigated during spring and autumn. A single, early afternoon feeding peak was observed during spring but no consistent pattern emerged from the autumn trial (fish did tend to feed in synchrony, even though the population's feeding pattern varied between days). Aggression was highest at first light during both spring and autumn, reducing thereafter throughout the day. Feeding and aggression were out of phase during spring, with the level of feeding increasing as aggression decreased. It is suggested that the high levels of early morning aggression are associated with re‐establishment of the social order that breaks down after a period of darkness; in the spring this may have inhibited feeding. |
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