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用呼吸室法测定了体质量分别为(3.75±0.50),(8.35±0.47),(13.70±0.33)g的拉氏鱼岁在不同水温(10,15,20,25℃)下耗氧率、耗氧量,并测定了体质量分别为(3.71±0.15),(8.47±0.21),(13.65±0.23)g拉氏鱼岁溶解氧临界窒息点的变化。结果表明:相同水温时,拉氏鱼岁的耗氧率(Y’)与体质量(W)呈负相关,耗氧量(Y)与鱼体质量(W)呈正相关,溶解氧临界窒息点(Y″)与鱼体质量(W)呈显著负相关。相同体质量,10℃与15℃、20℃、25℃间耗氧率和耗氧量差异均显著,15℃、20℃、25℃3个温度之间耗氧率与耗氧量差异均不显著。体质量(3.71±0.15)g,10℃与15℃、20℃、25℃溶解氧临界窒息点差异显著,15℃、20℃、25℃之间溶解氧临界窒息点差异不显著;体质量(8.47±0.21)g,10℃与15℃、20℃、25℃溶解氧临界窒息点差异显著,15℃与20℃、25℃溶解氧临界窒息点差异显著,20℃、25℃2个温度组溶解氧临界窒息点差异不显著;体质量(13.65±0.23)g,相邻2温度组溶解氧临界窒息点差异不显著,相间2温度组溶解氧临界窒息点差异显著。拉氏鱼岁的耗氧率存在着明显的昼夜变化规律,高峰时段分别出现在06:00~09:00和18:00~22:00。拉氏鱼岁溶解氧临界窒息点为(0.27±0.05)~(0.55±0.05)mg/L,表明其耐低氧能力较强,对水中溶解氧要求不高,在生产上适合高密度集约化养殖。
The respiration chamber method was used to determine the oxygen consumption rate of larval fish at different water temperatures (10, 15, 20 and 25 ℃) with body mass of (3.75 ± 0.50), (8.35 ± 0.47) and (13.70 ± 0.33) , And the oxygen consumption. The changes of the critical suffocation point of dissolved oxygen (OCD) were measured in body weight of (3.71 ± 0.15), (8.47 ± 0.21) and (13.65 ± 0.23) g respectively. The results showed that when the water temperature was the same, the oxygen consumption rate (Y ’) was negatively correlated with the body weight (W) and the oxygen consumption (Y) was positively correlated with the fish body mass (W) (Y) and fish body weight (W) were significantly negative correlation.The oxygen consumption rate and oxygen consumption of the same body weight, 10 ℃ and 15 ℃, 20 ℃, 25 ℃ were significantly different, 15 ℃, 20 ℃, 25 There was no significant difference between the oxygen consumption rate and the oxygen consumption in the three temperatures of body temperature.The body mass (3.71 ± 0.15) g, 10 ℃ and 15 ℃, 20 ℃, 25 ℃ dissolved oxygen critical suffocation point difference significantly, 15 ℃, 20 (8.47 ± 0.21) g, the difference of critical asphyxia point of dissolved oxygen at 10 ℃ and 15 ℃, 20 ℃ and 25 ℃ was significantly different between 15 ℃ and 20 ℃, 25 ℃, the critical suffocation point of dissolved oxygen was significantly different. There was no significant difference in the critical asphyxia point of dissolved oxygen between the two temperature groups of 20 ℃ and 25 ℃. There was no significant difference in the critical asphyxia point of dissolved oxygen between the body mass (13.65 ± 0.23) g and adjacent 2 temperature group, There was a significant difference between the two groups in the critical point of asphyxiation of dissolved oxygen at the interphase 2 temperature range.The apparent oxygen consumption rate of the larvae was significantly different from daytime to nighttime at 06: 00-09: 00 and 18: 00-22: 00 respectively Fish dissolve Asphyxiation critical point (0.27 ± 0.05) ~ (0.55 ± 0.05) mg / L, which showed strong resistance to hypoxia ability, less demanding of dissolved oxygen in water, suitable for high density intensive culture in production.