赤点石斑鱼与鞍带石斑鱼杂交子一代肌肉营养成分分析与评价

Analysis and Evaluation of Nutritional Composition in Muscle of Hybrid Grouper Epinephelus akaara♀×E. lanceolatus♂

为分析赤点石斑鱼与鞍带石斑鱼杂交子一代的营养组成,参照国家标准,测定了体质量(182.84±29.35) g杂交石斑鱼肌肉的常规营养成分、氨基酸和脂肪酸组成,并对肌肉营养价值进行了评定。试验结果显示,杂交石斑鱼肌肉水分、粗蛋白、粗脂肪和灰分的含量分别为(74.07±0.71)%、(21.52±0.78)%、(4.03±0.15)%和(1.29±0.07)%。肌肉鲜样中测定了17种氨基酸,总量为(19.88±0.15)%;必需氨基酸和鲜味氨基酸总量分别为(8.64±0.13)%和(7.64±0.16)%,必需氨基酸指数为85.19,必需氨基酸组成符合联合国粮农组织/世界卫生组织标准。肌肉鲜样中含有17种脂肪酸,饱和脂肪酸、单不饱和脂肪酸和多不饱和脂肪酸分别占肌肉脂肪酸总量的(27.63±1.15)%、(22.75±1.22)%和(32.59±1.90)%,其中二十二碳六烯酸和二十碳五烯酸占肌肉脂肪酸总量的(19.27±1.27)%。研究表明,赤点石斑鱼与鞍带石斑鱼杂交子一代具有较高营养价值,可作为新品种进行开发。

Approximate nutrient compositions, and levels of amino acid and fatty acid in muscle were analyzed and evaluated in hybrid grouper Epinephelus akaara♀×E. lanceolatus♂ with body weight of(182.84±29.35) g by route methods, and the national standard in order to verify the nutritional characteristics of the hybrid grouper. It was found that the hybrid grouper had muscular moisture of(74.07±0.71)%, lipid content of(21.52±0.78)%, crude protein content of(4.03±0.15)% and crude ash content of(1.29±0.07)%. Seventeen amino acids were detected from the muscle, with the total quantity of(19.88±0.15)%, essential amino acids(EAA) content of(8.64±0.13)%, delicious amino acids(DAA) of(7.64±0.16)%, essential amino acid index(EAAI) of 85.19, and the amino acid composition ratio accorded with the standard of FAO/WHO. There were 17 main fatty acids detected in the muscle of hybrid grouper, saturated fatty acid(SFA) content of(27.63±1.15)%, monounsaturated fatty acid(MUFA) content of(22.75±1.22)%, and polyunsaturated fatty acid(PUFA) content of(32.59±1.90)%, especially DHA+EPA accounting for(19.27±1.27)% in total fatty acids. The finding indicates that hybrid grouper is a kind of fish with high nutritive value and a potential aquaculture candidate.