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Iranian Journal of Fisheries Sciences، جلد ۲۱، شماره ۱، صفحات ۱۴۱-۱۵۶
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عنوان انگلیسی Research Article: Optimum dietary protein requirement for maximum growth performance of Caspian kutum (Rutilus frisii kutum) juveniles
چکیده انگلیسی مقاله A 12-weeks feeding trial was conducted to estimate the optimum dietary protein level of Caspian white fish as one of the highly important commercial species in the south of the Caspian Sea. The fish juveniles (0.59±0.05g body weight) were randomly distributed into 21 aquariums (30 fish per aquarium). The fish were fed with seven experimental diets containing 28, 32, 36, 40, 44, 48, and 52 % crude protein (CP). Results showed that dietary protein levels significantly (p< 0.05) affected growth performance and feed utilization of Caspian white fish juveniles. The fish fed a diet with 40% CP showed higher survival rate (p< 0.05) than other groups. Feeding the fish with diets at 40-44% CP improved the weight gain (WG) and specific growth rate compared to 28%, 32%, and 52% CP diets. The feed conversion ratio and protein productive value were promoted by increasing the dietary CP level, while the protein efficiency ratio was decreased in diets containing high CP levels (44-52%). The fish receiving the protein supplemented diets showed higher protein and lipid content than the initial fish population. The results indicated that dietary CP level only affected the body protein content of the Caspian white fish juveniles (p< 0.05). A broken-line regression calculated the protein requirement at 42.85-43.23 % based on the WG and PPV (protein productive value).
کلیدواژه‌های انگلیسی مقاله Body composition, Caspian kutum, Dietary crude protein, Growth, Feed efficiency
نویسندگان مقاله | A. Zahmatkesh
Aquaculture Department, Gilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran.


| K. Karimzadeh
2Department of Marine Biology, Lahijan Branch, Islamic Azad University, Lahijan, Iran.
نشانی اینترنتی http://jifro.ir/browse.php?a_code=A-10-1124-1&slc_lang=en&sid=1
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده aquaculture
نوع مقاله منتشر شده پژوهشی
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