TY - JOUR ID - TI - EFFECTS OF FISH WEIGHT AND WATER TEMPERATURE ON FEED INTAKE OF GRASS CARP, CTENOPHARYNGODON IDELLA (CUVIER AND VALENCIENNES, 1884) AU - MAJID M. TAHER PY - 2020 VL - 46 IS - 2 SP - 103 EP - 114 JO - Journal of Basrah Researches (Sciences) مجلة ابحاث البصرة ( العلميات) SN - 18172695 2411524X AB - The current experiment was conducted in the Fish Laboratory of Aquaculture Unit-College of Agriculture-University of Basra to investigate the effects of fish weight and water temperature on feed intake of grass carp, Ctenopharyngodon idella (Cuvier and Valenciennes, 1884). Five water temperatures (10, 15, 20, 25 and 30) oC and two fish weight (average weight 55 and 400 g) were investigated. Results of the current experiment showed that the highest daily consumed feed for large fishes was (9.44, 12.32, 17.76, 37.04 and 35.92) g, while the lowest daily consumed feed for small fishes was (3.68, 6.88, 4.64, 7.60 and 6.56) g in the temperature degrees, 10, 15, 20, 25, and 30 oC respectively. The average consumed feed and daily feeding rate by small fishes showed significant differences (P≤0.05) between water temperature 10 oC with 25 and 30 oC, while there were no significant differences (P>0.05) between water temperature 10, 15 with 20 oC, and between 15, 20, 25 with 30 oC. The average consumed feed for large fishes showed significant differences (P≤0.05) between water temperature 10 and 15 oC with water temperature 30 oC, while there were no significant differences (P>0.05) between water temperature 20 oC with other four temperatures. Statistical analysis of average daily feeding rate for large fishes showed significant differences (P≤0.05) between water temperature 10 oC with 25 and 30 oC, while there were no significant differences (P>0.05) between other temperatures. It can be concluded from these results that water temperature affected the daily feeding rate too much comparing with the low effect of fish size.

ER -