鲜活虹鳟鱼的呼吸频率与肌肉品质的相关性

为探讨鲜活虹鳟鱼的呼吸频率与肌肉品质之间的相关性，研究了不同呼吸频率所对应的肌肉品质的变化。测定了乳酸、糖原、丙二醛（Malondialdehyde,MDA）以及核苷酸类化合物含量和加压失水率。结果表明，随着呼吸频率的上升，糖原含量下降、丙二醛和核苷酸类化合物含量、加压失水率上升。当呼吸频率从83升至95次/min，乳酸含量由初始值1.46 mmol/g prot显著上升至2.37 mmol/g prot(P<0.01)。皮尔逊相关分析显示鲜活虹鳟鱼的呼吸频率与乳酸含量、MDA值、加压失水率呈现出极显著相关性（P<0.01），与糖原含量、AMP含量、IMP含量以及Hx和HxR总含量等肌肉品质呈现出显著相关性（P<0.05），相关系数分别为0.987、0.951、0.939、-0.897、0.847、0.896、0.882。这表明呼吸频率与肌肉品质具有强相关性，说明通过监测虹鳟鱼的呼吸频率变化可以对鲜活虹鳟鱼的肌肉品质进行初步预测。

Correlation between Respiratory Rate and Muscle Quality of Fresh Rainbow Trout (Oncorhynchus mykiss)

In order to investigate the correlation between respiratory rate and muscle quality in fresh rainbow trout, the changes of muscle quality corresponding to different respiratory rates were analyzed. The contents of lactic acid, glycogen, malondialdehyde (MDA), nucleotide compounds and pressurized water loss rate were measured. The result showed that with the increase of respiratory rate, the content of glycogen decreased, the content of malondialdehyde and nucleotide compounds, the rate of pressure water loss increased. When the respiratory rate increased from 83 to 95 times/min, the lactic acid content increased significantly from 1.46 to 2.37 mmol/g prot (P<0.01). Pearson correlation analysis showed that respiratory rate of fresh rainbow trout was very significantly correlated with lactic acid content, MDA value and pressurized water loss rate (P<0.01), and significantly correlated with muscle quality such as glycogen content, AMP content, IMP content and total Hx and HxR content (P<0.05). The correlation coefficients were 0.987, 0.951, 0.939, -0.897, 0.847, 0.896, 0.882, respectively. This study indicated that there was a strong correlation between respiratory rate and muscle quality, and the muscle quality of fresh rainbow trout (Oncorhynchus mykiss) could be preliminarily predicted by monitoring respiratory rate.