Influence of temperature,rate of feeding and body weight on nitrogen metabolism of bream,Abramis brama L |
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| Affiliation: | 1. Department of Coastal Sciences, Gulf Coast Research Laboratory, University of Southern Mississippi, 703 E Beach Dr., Ocean Springs, MS 39564, USA;2. Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;3. Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;1. Department of Fisheries Science, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran;2. Inland Water Aquaculture Research Centre, Iranian Fisheries Science Research Institute (IFSIR), Agriculture Research Education and Extension Organization (ARREO), Bandar-e Anzali, Iran;3. Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran |
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| Abstract: | - 1.1. Measurements of the rate of nitrogen consumption, total nitrogen and ammonia excretion and nitrogen absorption of bream, Abramis brama L. (body weight range 0.4–519 g wet wt) were made at 10, 15 and 20 C.
- 2.2. Fish were fed once daily on live zooplankton collected in Lake Balaton and cultured Tubifex sp. at 5–15% of their body weight.
- 3.3. Fish size and temperature had a combined effect on the rate of total nitrogen excretion. Total nitrogen excretion did not increase proportionally with an increase in consumption.
- 4.4. On average, 52–80% of the nitrogen consumed with food was excreted by bream.
- 5.5. The greatest part of total nitrogen excretion was ammonia and its proportion in the total ranged between 53 and 75%.
- 6.6. Temperature did not have any significant effect on the proportion of excreted ammonia and the rate of excreted total nitrogen was the only factor determining its proportion in the total.
- 7.7. The rate of nitrogen absorption of bream was surprisingly very high.
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