赤眼鳟和麦瑞加拉鲮的化学组成、能量密度及对鳜的营养价值

为评价赤眼鳟(Squaliobarbus curriculus)和麦瑞加拉鲮(Cirrhinus mrigala)对鳜(Siniperca chuatsi)的营养价值,分别测定了体质量为(5.27±1.03)g的赤眼鳟、(5.05±1.21)g的麦瑞加拉鲮和(5.19±0.92)g的鳜的化学组成,估算了这3种鱼的能量密度,以探讨赤眼鳟代替麦瑞加拉鲮养殖鳜的可行性。结果显示,赤眼鳟和麦瑞加拉鲮的全鱼蛋白质含量显著高于鳜,水分显著低于鳜(P0.05),必需氨基酸指数分别高达92.56%±2.31%和93.17%±0.36%,多数必需氨基酸的化学评分≥0.82。而赤眼鳟的脂肪和能量密度更高,显著高于麦瑞加拉鲮和鳜,灰分显著低于麦瑞加拉鲮(P0.05)。研究表明,这两种鱼对鳜都具有较高的营养价值,但赤眼鳟的营养价值更高,以赤眼鳟代替麦瑞加拉鲮养殖鳜是可行的,这为转变鳜的养殖方式提供了参考。

The chemical composition and energy density of Squaliobarbus curriculus and Cirrhinus mrigala with nutritional value to Sinaperca chuatsi

In order to evaluate nutritional value of Squaliobarbus curriculus and Cirrhinus mrigala to Sinaperca chuatsi, chemical components were determined and energy density were estimated in S. curriculus with body weight of(5.27±1.03) g,C. mrigala(5.05±1.21) g and S. chuatsi(5.19±0.92) g, to explore the feasibility of replacing C. mrigala with S. curriculus in S. chuatsi culture. The results showed that protein content of whole fish in S. curriculus and C. mrigala was significantly higher and moisture content was significantly lower than that of S. chuatsi (P<0.05). The essential amino acid indexes of the two fishes reached 92.56%±2.31% and 93.17%±0.36%), respectively. Chemical score of most essential amino acids were higher than 0.84. Fat content and energy density of S. curriculus were significantly higher than those of C. mrigala and S. chuatsi, and ash content was significantly lower than that of C. mrigala (P<0.05). It indicated that the two fishes had high nutritional value to S. chuatsi, but S. curriculus showed higher nutritional value than C. mrigala. It is feasible to use S. curriculus to replace C. mrigala in S. chuatsi culture, which provides a reference to transform culture methods in S. chuatsi.