نوع مقاله : مقاله پژوهشی
نویسندگان
1 پژوهشکده آبزی پروری آبهای داخلی، مؤسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندر انزلی، گیلان
2 مؤسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Introduction: Grass carp, Ctenopharyngodon idella, is considered one of the most commercially important farmed fish in the world. One of the important factors in the development of aquaculture is to provide a suitable ration that can meet the nutritional requirements of this fish, and on the other hand, the ration should be as cheap as possible so ultimately to achieve cheaper food by optimizing the food ration. In this research, the effect of different levels of soybean meal and canola on growth parameters and carcass composition of grass carp fingerlings with an average initial weight of 7.56 ± 1.12 g (mean ± SD) were investigated for 60 days.
Materials and methods: Experiments were conducted in 100-L fiberglass tanks containing 7 grass carp fingerlings in 3 repetitions, with a total of 9 experimental tanks. The three treatments included Treatment 1 (T1) with a diet containing 24.5% soybean meal and 24.5% canola meal, Treatment 2 (T2) with 29% canola meal and 21% soybean meal, and Treatment 3 (T3) with 28% soybean meal and 20% canola meal. The tanks were divided completely randomly.
Results and discussion: According to Duncan test, differences were observed between the treatments in terms of mean food conversion ratio (FCR), specific growth rate, and weight gain (P<0.05). The results showed that the maximum and minimum amounts of weight gain were occurred in T3 (89.91 ± 2.4 g) and T2 (58.39 ± 13.17 g), respectively. The minimum of special growth rate (0.70 ± 0.15 %/day) was observed in T2, while the maximum (1.06 ± 0.02 %/day) in T3. The minimum average of FCR (2.09 ± 0.05) was found in T3 while the maximum (3.69 ± 1.09) in T2. The results obtained from the Kruskal-Wallis test did not exhibit any significant difference among different treatments in terms of the biochemical composition of the fingerling carcasses, including protein, fat, ash, and moisture contents (P<0.05).
Conclusion: According to the obtained results, it seems that 28% soybean meal and 20% canola are the most suitable levels in the diet of grass carp fingerlings.
کلیدواژهها [English]
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