许氏平鲉、大泷六线鱼临界游速与爆发游速及其生理指标的研究

Critical swimming speed,burst swimming speed and related physiological index in rockfish Sebastes schlegeli and fat greenling Hexagrammos otakii

利用垂直循环回流水槽和PVC水槽,分别测定了许氏平鲉Sebastes schlegeli、大泷六线鱼Hexagram-mos otakii的临界游速和爆发游速,并分析了鱼类游泳后对其生理指标的影响。结果表明：体长为10~22cm的许氏平鲉其临界游速为44.69~69.07 cm/s,其相对临界游速为3.11~4.69 BL/s;体长为10~22 cm的大泷六线鱼其临界游速为42.39~82.93 cm/s,其相对临界游速为3.45~4.90 BL/s;体长为10~22 cm的许氏平鲉其爆发游速为76.68~118.18 cm/s;体长为10~22 cm的大泷六线鱼其爆发游速为81.69~121.25 cm/s。根据临界游速测定结果,估算出许氏平鲉和大泷六线鱼的最大游泳距离分别为6 776.4 m和7 423.2 m;根据爆发游速的测定结果估算出两种鱼的最适逃逸距离为15~25 m。临界游泳疲劳后,许氏平鲉血糖、血乳酸和肌肉乳酸含量均显著高于对照组（P〈0.05）,肌糖元、肌肉蛋白与对照组无显著差异（P〉0.05）;大泷六线鱼血乳酸、肌肉乳酸含量显著高于对照组（P〈0.05）,血糖、肌糖元、肌肉蛋白含量显著低于对照组（P〈0.05）。爆发游泳疲劳后,许氏平鲉血糖、血乳酸、肌肉乳酸含量均显著高于对照组（P〈0.05）,肌糖元含量与对照组无显著差异（P〉0.05）;大泷六线鱼血糖、肌糖元、肌肉蛋白含量显著低于对照组（P〈0.05）,血乳酸含量显著高于对照组（P〈0.01）,肌肉乳酸含量显著高于对照组（P〈0.05）。

The critical swimming speeds and burst swimming speeds were determined in rockfish Sebastes schlegeli and fat greenling Hexagrammos otakii by vertical recirculating water flume and PVC water flume in a laboratory.The effect of swimming on fish body was studied according to the changes in physiological index.The results showed that the rockfish with body length 10-22 cm had critical swimming speed of 44.69-69.07 cm/s,and the relative swimming speed of 3.11-4.69 BL/s.The fat greenling with body length 10-22 cm showed the critical swimming speed of 42.39-82.93 cm/s,and relative swimming speed of 3.45-4.90 BL/s.The rockfish with body length 10-22 cm was found to have burst swimming speed of 76.68-118.18 cm/s.The fat greenling with body length 10-22 cm had burst swimming speed of 81.69-121.25 cm/s.The maximal swimming distance was estimated to be 6 776.4 m in rock fish and 7 423.2 m in fat greenling.According to the results of the burst swimming speed,the most appropriate potential distance for escaping was 15-25 m.After fatigue aroused by critical swimming,the plasma glucose,plasma lactate and muscle lactate concentrations increased significantly in rockfish（P0.05）,no significant differences in muscle glycogen and muscle protein（P0.05）.There were significant increase in the plasma lactic and muscle lactic concentrations and reduction in the plasma glucose,muscle glycogen and muscle albumin in fat greenling（P0.05）.After fatigue aroused by burst swimming,the plasma glucose,plasma lactic and muscle lactic concentrations of increased significantly in rockfish（P0.05）,no significant differences in muscle glycogen（P0.05）.Moreover,the plasma glucose,muscle glycogen and muscle albumin were reduced significantly（P0.05） and increased significantly the plasma lactic and the muscle lactic in fat greenling increased significantly（P0.05）.