Using demand-feeders, time-place learning association of food was investigated in rainbow trout (Oncorhynchus mykiss) in 2 small raceways (TR1 and TR2). In order for the fish to be visually identified, they were tagged individually and their behaviour and distribution were monitored by cameras. Equipping with a demand-feeder, TR1 was assigned to test 2 times/1 place (2T/1P) while 2 demand-feeders were used in TR2 assigned to test 2 times/2 places (2T/2P). After 26 days of restricted feeding (RF) the fish were deprived of food for 3 days. The results of the present study indicate that, at the group level, rainbow trout are not able to clearly demonstrate time-place learning except for some fish in the group. These fish were identified as dominants, in terms of a higher rate of agonistic acts or a greater amount of food eaten. Feeding behaviour was largely influenced by social dominance of the group, especially through territoriality.
HEYDARNEJAD, M. SAEED and PURSER, G. J. (2008) "Specific Individuals of Rainbow Trout (Oncorhynchus mykiss) Are Able to Show Time-Place Learning," Turkish Journal of Biology: Vol. 32: No. 3, Article 10. Available at: https://journals.tubitak.gov.tr/biology/vol32/iss3/10