Effects of feeding time,water temperature,feeding frequency and dietary composition on apparent nutrient digestibility in rainbow trout Oncorhynchus mykiss and common carp Cyprinus carpio |
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| Authors: | Yamamoto Takeshi Shima Takao Furuita Hirofumi Sugita Tsuyoshi Suzuki Nobuhiro |
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| Institution: | (1) Feed Research Group, Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Hiruta, 519-0423 Tamaki, Mie, Japan;(2) Central Laboratory, Marine Ecology Research Institute, 599-5105 Onjuku, Chiba;(3) Department of Fisheries, School of Marine Science and Technology, Tokai University, Orido, 424-8610 Shimizu, Shizuoka, Japan |
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| Abstract: | A series of experiments was conducted to evaluate the effects of feeding time (daytime vs nighttime feeding), dietary fat content (8 and 20%), feeding frequency (trout 1–3 times/day, carp 2–7 times/day), water temperature
(trout 18 and 11°C, carp 25 and 17°C), on the apparent nutrient digestibility in rainbow trout and common carp. The feeding
time had little effect on the macronutrient digestibility in both species. In trout, starch digestibility decreased with the
decrease of water temperature and with increase of feeding frequency, but in carp, increase of the feeding frequency markedly
decreased the macronutrient digestibility and phosphrrus absorption of the high fat diet. Fat digestibility of the beef tallow
diet decreased relative to the pollock oil diet in carp, without affecting the phosphorus absorption. Inclusion of raw starch,
the digestibility of which was lower than that of gelatinized starch, increased the phosphorus absorption in carp. These results
suggest that reduction of water temperature and increase of feeding frequency notably decreased starch digestibility in trout
while in carp, the effects of feeding frequency and water temperature on macronutrient digestibility and phosphorus absorption
are notable for a high fat diet. |
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| Keywords: | Cyprinus carpio diet digestibility fat Oncorhynchus mykiss phosphorus |
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