Abstract
A 120-day feeding experiment was conducted to determine the effects of dietary partial replacement of tuna oil by corn oil at different ratios in formulated diets, by which growth performance and proximate composition of juvenile spotted babylon Babylonia areolata was analyzed. Four isonitrogenous and isolipidic diets were formulated with 10% lipid derived from the following lipid sources: diet A (100% tuna oil without corn oil (control), diet B: 50% tuna oil and 20% corn oil, diet C: 30% tuna oil and 40% corn oil and diet D: 10% tuna oil and 60% corn oil. This study showed that all formulated diets were well accepted by the snails throughout the culture period. There were no significant differences in body weight gain, shell length increment and growth rate among the feeding experiments. No significant differences were observed in feed conversion ratio among the dietary treatments ranging from 4.35 to 4.77. Survival was high ranging from 98.00% to 100% and no significant differences in survival were observed. At the end of the experiment, crude protein and fat contents of whole body weight of snails were not statistically different among the feeding experiments. Crude protein and fat of snails fed four experimental diets ranged from 61.38 to 61.48% and 5.36% to 5.39%, respectively. This study indicated partial replacement of tuna oil by corn oil in formulated diets have no effects on growth performance but fat content of the whole body reduced to half than those contained in formulated diets.A 120-day feeding experiment was conducted to determine the effects of dietary partial replacement of tuna oil by corn oil at different ratios in formulated diets, by which growth performance and proximate composition of juvenile spotted babylon Babylonia areolata was analyzed. Four isonitrogenous and isolipidic diets were formulated with 10% lipid derived from the following lipid sources: diet A (100% tuna oil without corn oil (control), diet B: 50% tuna oil and 20% corn oil, diet C: 30% tuna oil and 40% corn oil and diet D: 10% tuna oil and 60% corn oil. This study showed that all formulated diets were well accepted by the snails throughout the culture period. There were no significant differences in body weight gain, shell length increment and growth rate among the feeding experiments. No significant differences were observed in feed conversion ratio among the dietary treatments ranging from 4.35 to 4.77. Survival was high ranging from 98.00% to 100% and no significant differences in survival were observed. At the end of the experiment, crude protein and fat contents of whole body weight of snails were not statistically different among the feeding experiments. Crude protein and fat of snails fed four experimental diets ranged from 61.38 to 61.48% and 5.36% to 5.39%, respectively. This study indicated partial replacement of tuna oil by corn oil in formulated diets have no effects on growth performance but fat content of the whole body reduced to half than those contained in formulated diets.
Highlights
Traditional culture of spotted Babylon Babylonia areolata in Thailand mainly depended on chopped trash fish as the main feed source for grow out, which is expensive, has limited supply, uncertain nutritional quality, difficult to store, deteriorates water quality and may result in the spread of disease [1]
Survival was high ranging from 98.00% to 100% and no significant differences in survival were observed (P>0.05)
There was no significant differences in body weight gain, shell length increment and growth rate among the feeding experiments
Summary
Traditional culture of spotted Babylon Babylonia areolata in Thailand mainly depended on chopped trash fish as the main feed source for grow out, which is expensive, has limited supply, uncertain nutritional quality, difficult to store, deteriorates water quality and may result in the spread of disease [1]. Vegetable oils constitute promising candidates for fish oil replacement, having steadily increasing production, with high availability and better economic value. Some vegetable oils such as soybean oil and rapeseed oil are considered as possible alternative lipid source for freshwater and marine fish [7]. A key requirement for the replacement of fish oil in aquafeeds is to supply equivalent energy with balanced essential fatty acids. This is necessary in order to sustain high growth, survival, feed conversion efficiency, immune competence, disease resistance, and flesh quality. This study was designed to determine the effects of partial replacement of tuna oil by corn oil in formulated diets for the growth performance and proximate composition of juvenile spotted Babylon Babylonia areolata
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