Behaviour of rainbow trout (Oncorhynchus mykiss) under defensible and indefensible patterns of food delivery

M. Saeed Heydarnejad; G. J. Purser

doi:10.1007/s00343-010-9935-z

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Behaviour of rainbow trout (Oncorhynchus mykiss) under defensible and indefensible patterns of food delivery

Updated：2023-05-16

- Behaviour of rainbow trout (Oncorhynchus mykiss) under defensible and indefensible patterns of food delivery
- Journal of Oceanology and Limnology Vol. 28, Issue 4, Pages: 749-755(2010)
- Affiliations：
  
  1. Aquaculture Sector Biology Dept. Faculty of Science Shahrekord Uni
  2. School of Aquaculture Tasmanian Aquaculture and Fisheries Institute University of Tasmania
- Author bio：
- Funds：
- DOI：10.1007/s00343-010-9935-z
  CLC：
- Online First：29 June 2010，
  
  Published：2010
- Accepted：
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Saeed Heydarnejad, M., Purser, G.J. Behaviour of rainbow trout (Oncorhynchus mykiss) under defensible and indefensible patterns of food delivery., Chin. J. Ocean. Limnol. 28, 749–755 (2010). https://doi.org/10.1007/s00343-010-9935-z
DOI：

Saeed Heydarnejad, M., Purser, G.J. Behaviour of rainbow trout (Oncorhynchus mykiss) under defensible and indefensible patterns of food delivery., Chin. J. Ocean. Limnol. 28, 749–755 (2010). https://doi.org/10.1007/s00343-010-9935-z DOI：

摘要

Abstract

The goal of this study was to investigate the behaviour of rainbow trout (n=30)

Oncorhynchus mykiss

in small raceways when either self-feeders (T2) or hand-feeding (t2) were used. The method of food delivery in T2 was defensible while that of t2 was indefensible. Fish in both raceways were subjected to restricted feeding (RF) for 25 days. Food was available in the morning (09:00–10:00) in the downstream area and in the afternoon (16:00–17:00) in the upstream area of the raceways. The results showed that the behaviour of rainbow trout was significantly different under interference competition (T2) for food compared with that under scramble competition (t2). RF in T2 fish limited food availability to meal times when feeding rewards were available while t2 fish only responded to the location of food delivery. The aggressive fish in T2 were dominant

and t2 fish at high densities showed intense social interactions under the indefensible pattern of food distribution; these interactions did not dampen to a minimum level to suppress the development of dominance hierarchies. Further

the stocking density did not break down the dominance hierarchies between the T2 fish. This suggests that decreased efficiency in the search for food or inefficient foraging

induced by interference competition at high densities

affected the behaviour of rainbow trout.

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references

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