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杂交鲷是以真鲷为母本,黑鲷为父本的杂交F1代品种,为了比较杂交鲷与黑鲷的代谢特征,采用静水密闭式呼吸仪测定了13、18、23、28、33℃(32℃)5个温度下杂交鲷和黑鲷幼鱼的代谢率及排泄率.结果表明:13~28℃温度下,杂交鲷和黑鲷幼鱼的代谢率、排泄率均随温度的升高而升高,28℃时杂交鲷和黑鲷幼鱼的代谢率、排泄率分别为14.22±0.95、0.39±0.02 J/(g.h)和17.47±0.14、0.43±0.02 J/(.gh),分别是其13℃时的5.69、4.05倍和4.01、3.73倍;且各温度下黑鲷的代谢率始终高于杂交鲷,前者是后者的1.23~1.73倍;杂交鲷和黑鲷幼鱼分别在32℃和33℃时代谢率比28℃下跌了22.23%和3.83%,证明该温度已分别超出了这2种幼鱼的最高适温;杂交鲷和黑鲷幼鱼28℃时的窒息点溶解氧含量分别为1.94、1.40 mg/dm3,低于真鲷21℃时的窒息点溶解氧含量(2.30 mg/dm3);O∶N原子比值结果显示,28℃时蛋白质供能比最低,生长积累速度最快,是2种幼鱼的最适温度.综合分析认为,杂交鲷幼鱼具有代谢率显著低于亲本的优点,也继承了父本耐低温的特点,但同时失去了亲本耐高温、耐低氧的特点,并出现了应激反应大等不良性状.
Hybrid bream is a hybrid breed F1 hybrid with red seabream as the female parent and red seabream as the parent. In order to compare the metabolic characteristics of hybrid seabream and black seabream, the hydrostatic closed-loop respirator was used to measure 13, 18, 23, 28 and 33 ℃ The metabolic rate and excretion rate of juvenile snapdragon and black seabream at 5 ℃ were studied.The results showed that the metabolic rate and excretion rate of juvenile hybrid snapper and black sea bream were both increased with the increase of temperature at 13 ~ 28 ℃ The metabolic rate and excretion rate of juvenile snapdragon and black sea bream at 28 ℃ were 14.22 ± 0.95,0.39 ± 0.02 J / gh and 17.47 ± 0.14,0.43 ± 0.02 J / g · gh respectively, Respectively, which are 5.69, 4.05 times and 4.01, 3.73 times respectively at 13 ℃; and the metabolic rate of black sea bream is always higher than that of hybrid sea bream at each temperature, the former is 1.23 ~ 1.73 times of the latter; the hybrid bream and black sea bream juvenile At 32 ℃ and 33 ℃, the metabolic rate decreased by 22.23% and 3.83% respectively compared with 28 ℃, which proved that the temperature exceeded the maximum temperature of juveniles. Dissolved oxygen content was 1.94,1.40 mg / dm3, respectively, which was lower than that of the asphyxial point (2.30 mg / dm3) at 21 ℃. The atomic ratio of O: N showed that the protein energy- The fastest temperature was the optimum temperature for juvenile juvenile.Comprehensive analysis showed that juvenile hybrid juvenile seabream had the advantage of lower metabolic rate than the parental, inherited the low temperature tolerance of the male parent, , Resistant to hypoxia characteristics, and the emergence of stress response and other undesirable traits.