of juvenile grass carp Ctenopharyngodon idella have been raised
within 6 months on animal and vegetable foods (Kasumyan & Morsi, 1997). Carps conditionally named carnivorous have been grown on Chironomidae larvae, carps named vegetarian on duckweed and Romaine lettuce (Lactuca
sativa) leaves, respectively. After conditioning, carnivorous carps show preferences for
agar-agar pellets with the Chironomidae larvae extract (75 g w.w. per 1 liter),
vegetarian carps to pellets with the lettuce extract (75 g w.w.). According to Kasumyan & Morsi (1997), carps of both groups do
not change specific preferences for individual 21 amino acids and 4 classical
taste substances tested.
gustatory search images form in the memory of fish relatively quickly. In
common carp, Cyprinus carpio (Ivlev,
1977), fairly stable visual and gustatory search images in respect of
Chironomidae larvae and other natural foods form within 1-2 weeks.
1977. Experimental ecology of the feeding of fishes. Nukova Dumka Publishers,
A.O., Morsi A.M.K. 1997. Taste preferences of classical taste substances by juvenile grass carp Ctenopharyngodon idella (Cyprinidae, Pisces), raised on animal and
vegetate foods. Proceedings of
the Russian Academy
of Sciences 357, 284-286