赤眼鳟耗氧率、排氨率和窒息点的初步研究

摘要

采取封闭流水式的实验方法,研究了对不同温度(16℃、20℃、24℃、28℃)对体质量小规格(6.98±1.19)g和大规格(22.45±1.79)g的赤眼鳟(Squaliobarbus curriculus)幼鱼耗氧率、排氨率以及窒息点的影响.结果表明,温度(X)对小规格和大规格赤眼鳟的耗氧率(Yo)和排氨率(YN)有显著性影响,其两两间的相关关系可分别用方程式:小规格赤眼鳟Yo=0.012x-0.135 (R2=0.969),大规格赤眼鳟Yo=0.007x-0.058(R2=0.991);小规格赤眼鳟YN=0.001x-0.010(R2=0.981),大规格赤眼鳟YN=0.001e0.085x(R2=0.943)来表示.在16～28℃范围内赤眼鳟幼鱼的耗氧率和排氨率随着温度的升高而呈显著上升.在16℃时赤眼鳟的排氨率要显著性的低于20 ～28℃,而在20 ～28℃之间赤眼鳟幼鱼的排氨率差异性不显著.耗氧率昼夜变化表明大、小规格赤眼鳟白天平均耗氧率高于夜间.16℃条件下,小规格和大规格赤眼鳟的窒息点最低分别为0.860和0.960mg/L,显著性低于20～ 28℃.%The effects of water temperature (16,20,24 and 28 ℃) on oxygen consumption rate,ammonia excretion rate and suffocation point in artificially propagated Squaliobarbus curriculus (6.98 ± 1.19) g and(22.45 ± 1.79) g were evaluated.Water temperature had a significant effect on both oxygen consumption rate and ammonia excretion rate(YN.),and the co-relationship was expressed by the quadratic equations small size Yo =0.012x-0.135 (R2 =0.969),big size Yo =0.007x-0.058 (R2 =0.991);small size YN =0.001 x-0.010 (R2 =0.981),big size YN =0.001 e0.085 X x (R2 =0.943).The results showed that oxygen consumption rate and ammonia excretion rateof S.curriculus juveniles increased as water temperature increased and at 28 ℃ was the highest.There was higher oxygen consumption rate during day than that at night.The lowest suffocation pointof small and big size S.curriculus at 16 ℃ (0.860 mg/L and 0.960 mg/L,respectively) were significant lower than that at 20 ～ 28 ℃.