摘要
为探究长春鳊(Parabramis pekinensis)选育系第 4 代(F4)与非选育系(CON)之间的差异,进行了 9个半月的养殖生产对比试验,对两个品系的生长性状、一般体成分以及肌肉营养品质进行了对比分析.结果表明:选育系F4 组的终末体质量、终末体长、体质量增长率和特定生长率等各项指标均显著高于非选育系(CON组)(P<0.05),具有更好的生长和形体指标参数,其中F4 组终末平均体质量比CON组高25%,肥满度也显著高于CON组(P<0.05);F4 组肌肉中的游离氨基酸Gly、Pro、Ala和Met均显著高于CON组(P<0.05),同时,F4 组鲜味氨基酸总量/氨基酸总量(F/T)略高于CON组;对于脂肪酸而言,F4 组C16∶0、C18∶1、C18∶2、∑SFA和∑PUFA均显著高于CON组(P<0.05).结果表明,长春鳊生长形体指标受不同品系的影响较大,选育系长春鳊F4 在生长、生化成分和肌肉营养品质方面优于非选育系,但氨基酸、脂肪酸含量对鱼体影响的过程较为复杂,还需要进一步研究论证.
Abstract
A 9-and-a-half month culture trial was conducted to investigate the differences between the 4th-genera-tion selectively bred(F4)line and the non-selectively bred(CON)line of Parabramis pekinensis.Comparative analyses were performed on growth traits,general body composition,and muscle nutritional quality.The results demonstrated that the F4 line exhibited significantly higher final body weight,final body length,weight gain rate,and specific growth rate than the CON line(P<0.05),indicating superior growth performance and morphological parameters.The final average body weight of the F4 group was 25%higher than that of the CON group,and the condition factor was also significantly higher in the F4 group(P<0.05).Regarding amino acids composition,the levels of Gly,Pro,Ala,and Met,were significantly higher in the F4 group than in the CON group(P<0.05).Additionally,the umami amino acid ratio(F/T)in the F4 group was slightly higher than in the CON group.For fatty acids,the F4 group exhibited significantly higher levels of C16∶0,C18∶1,C18∶2,∑SFA,and ∑PUFA compared to the CON group(P<0.05).These findings suggest that growth and morphological traits of P.pekin-ensis are greatly influenced by selective breeding,and the F4 selectively bred line exhibits superiority in growth performance,biochemical composition,and muscle nutritional quality compared to the non-selectively bred line.However,the process of the influence of amino acid and fatty acid content on fish body was complicated,and fur-ther research and demonstration were needed.
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