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Nitrogen excretion patterns and postprandial ammonia profiles in Black Sea turbot under Controlled conditions

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Title: Nitrogen excretion patterns and postprandial ammonia profiles in Black Sea turbot under Controlled conditions
Authors: Yigit, Murat
Erdem, Muammer
Aral, Orhan
Karaali, Burcu
Keywords: ammonia, Black Sea turbot, intensive fish culture, nitrogen excretion, Scophthalmus maeoticus
LC Subject Headings: Fish culture--Israel--Periodicals.
Fish culture--Periodicals.
Aquaculture--Israel--Periodicals.
Aquaculture--Periodicals.
Issue Date: 2005
Publisher: Israeli Journal of Aquaculture - BAMIGDEH
Citation: Yigit, M., Erdem, M., Aral, O., & Karaali, B. (2005). Nitrogen excretion patterns and postprandial ammonia profiles in Black Sea turbot under Controlled conditions. The Israeli Journal of Aquaculture - Bamidgeh, 57(4), 231-240.
Series/Report no.: The Israeli Journal of Aquaculture - Bamidgeh
Abstract: Measurements of the rate of nitrogenous excretion were carried out in two batches of young Black Sea turbot (small 42 g, large 72 g) at 12±1°C under natural light conditions (10 h light:14 h dark and 13 h light:11 h dark, respectively). The ammonia nitrogen excretion rates of fish starved for 48 hours were 0.20±0.05 mg-N for the small fish and 0.18±0.09 mg-N/100g fish/h for the large. Fish were then fed a pellet diet containing 8.3% nitrogen at average rations of 0.67% and 0.59% of the body weight, respectively, for four days. On the fourth day, ammonia nitrogen excretion rates were evaluated. In both batches, the rates were 2-3 times higher immediately after feeding than in the starved fish, reaching a peak 3-6 hours after feeding and declining after- wards. For the small and large fish, respectively, 21% and 20% of the consumed nitrogen was excreted as ammonia nitrogen, 6% and 7% as urea nitrogen, and 8% and 4% as feces nitrogen within 24 hours after feeding.
Pages/Duration: 10 pages
URI/DOI: http://hdl.handle.net/10524/19150
ISSN: 0792-156X
Appears in Collections:IJA Volume 57, Issue 4, 2005



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