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在不同温度下,分别采用流水和静水呼吸室法,测定雷氏七鳃鳗变态前后及以规格为标准分类的大规格成年雷氏七鳃鳗Lampetra reissneri(成鳗大)、小规格成年雷氏七鳃鳗(成鳗小)、大规格幼年雷氏七鳃鳗(幼鳗大)和小规格幼年雷氏七鳃鳗(幼鳗小)的耗氧量、耗氧率和窒息点。结果表明:成鳗大(8.59g±0.20 g)、成鳗小(5.42 g±0.10 g)和幼鳗小(5.27 g±0.17 g)的耗氧率存在昼夜变化;其中成鳗大的最高耗氧率(0.167 mg/g.h±0.022 mg/g.h)、最低耗氧率(0.035 mg/g.h±0.003 mg/g.h)与成鳗小的最高耗氧率(0.192 mg/g.h±0.036 mg/g.h)、最低耗氧率(0.051 mg/g.h±0.016 mg/g.h)均出现在8:00和16:00;幼鳗小的最高耗氧率(0.119 mg/g.h±0.027 mg/g.h)和最低耗氧率(0.038mg/g.h±0.013 mg/g.h)分别出现在18:00和14:00。在1~20℃时,雷氏七鳃鳗的耗氧率与水温呈正相关,成鳗大(10.45 g±0.13 g)的关系式为Y大=0.0254X0.9115(R2=0.8516),成鳗小(4.65 g±0.07 g)的关系式为Y小=0.0272X0.9406(R2=0.8840);而幼鳗小(5.92 g±0.05 g)的耗氧量、耗氧率随着水温的升高,呈波浪式上升。在1~15℃时,成鳗大(10.67 g±0.18 g)的窒息点随着水温的上升而降低,其关系式为Y大=0.2224X-0.3945(R2=0.9710),在15~20℃时,其窒息点随着水温的上升而上移,窒息点曲线呈“V”字型;在1~10℃时,成鳗小(5.46 g±0.12 g)的窒息点随着水温上升而降低,关系式为Y小=0.4427X-0.6561(R2=0.8866),在10~20℃时,其窒息点随着水温的上升呈上升趋势,但差异不显著(P>0.05);在1~15℃时,幼鳗小(5.74±0.83 g)的窒息点随着水温的上升而降低,在15~20℃时,其窒息点随着水温的升高而上升,关系式为Y幼=0.3008X-0.4003(R2=0.8581)(P<0.05)。体质量不同的成鳗大(10.10 g±0.13 g)与成鳗小(4.79 g±0.08 g)的耗氧量差异显著(P<0.05),而耗氧率则无显著差异(P>0.05);体质量不同的幼鳗大(7.60 g±0.15 g)与幼鳗小(4.79 g±0.09 g)的耗氧量和耗氧率均无显著差异(P>0.05)。
At different temperatures, the large-scale adult Lampetra reissneri (Larvae angustifolia) before and after the metamorphosis and the specifications of the standard test were determined by the method of flowing water and still water respiration chamber, The lamprey (small eel), the large-sized young lampreys (Larva) and the small-sized young lampreys (small eel) consumed oxygen, oxygen consumption and suffocation points. The results showed that there were diurnal variations in oxygen consumption rate of large eel (8.59 g ± 0.20 g), small eel (5.42 g ± 0.10 g) and small eel (5.27 g ± 0.17 g) Oxygen rate (0.167 mg / gh ± 0.022 mg / gh), the lowest oxygen consumption rate (0.035 mg / gh ± 0.003 mg / gh) and the lowest oxygen consumption rate (0.192 mg / gh ± 0.036 mg / gh) The lowest oxygen consumption rate (0.051 mg / gh ± 0.016 mg / gh) occurred at 8:00 and 16:00 respectively. The small maximum oxygen consumption rate (0.119 mg / gh ± 0.027 mg / gh) and the lowest oxygen consumption rate (0.038 mg / gh ± 0.013 mg / gh) appeared at 18:00 and 14:00, respectively. At 1 ~ 20 ℃, the oxygen consumption rate of Lamprey domesticas was positively correlated with water temperature. The relational equation of large (10.45 g ± 0.13 g) of eel was Y = 0.0254 × 0.9115 (R2 = 0.8516) The small (4.65 g ± 0.07 g) relationship was Y = 0.0272 × 0.9406 (R2 = 0.8840). However, the oxygen consumption and oxygen consumption of young eel (5.92 g ± 0.05 g) increased with the increase of water temperature , Showing a wave-like rise. At 1 ~ 15 ℃, the asphyxia point of large eel (10.67 g ± 0.18 g) decreased with the increase of water temperature, and the relation was Y = 0.2224X-0.3945 (R2 = 0.9710) , The asphyxiation point moved up with the increase of water temperature, and the curve of suffocation point was “V”. At 1 ~ 10 ℃, the asphyxia point of small eel (5.46 g ± 0.12 g) The relationship was Y = 0.4427X-0.6561 (R2 = 0.8866). At 10 ~ 20 ℃, the asphyxiation point increased with the increase of water temperature, but the difference was not significant (P> 0.05) At ~ 15 ℃, the juvenile eel (5.74 ± 0.83 g) asphyxiation point decreased with the increase of water temperature. At 15 ~ 20 ℃, the asphyxiation point increased with the increase of water temperature, the relationship was Y = 0.3008X-0.4003 (R2 = 0.8581) (P <0.05). The oxygen consumption of large eel (10.10 g ± 0.13 g) and small eel (4.79 g ± 0.08 g) with different body weights differed significantly (P <0.05), while the oxygen consumption rate had no significant difference (P> 0.05) (P> 0.05). There was no significant difference in oxygen consumption rate and oxygen consumption rate between young eel (7.60 g ± 0.15 g) and young eel (4.79 g ± 0.09 g).