饥饿胁迫对瓦氏黄颡鱼幼鱼存活率、体成分及消化酶活性的影响

在(23±2)℃条件下,将720尾质量为(1.52±0.2)g的瓦氏黄颡鱼幼鱼放入水簇箱中,进行饥饿胁迫试验50 d,研究饥饿胁迫对瓦氏黄颡鱼幼鱼的血糖浓度、存活率、形体指标、肝脏和肌肉营养成分及消化酶活力的影响.结果表明:与对照相比,饥饿胁迫50 d后,瓦氏黄颡鱼幼鱼的体质量、肝脏指数、肥满度、血糖浓度分别显著下降了...

Effects of starvation stress on survival rate, body composition and activity of digestive enzymes of the Pelteobagrus vachelli juveniles

About 720 Pelteobagrus vachelli juvenile((1.52±0.2) g) were starvation stressed for 50 days at(23±2)℃ in 200 L aquarium,and the effects of starvation stress on blood glucose,survival rate,parameter of nutrient component and activity of digestive enzyme were examined.The results showed that the body weight,liver index,condition factor,and blood glucose were decreased 33.55%,8.50%,30.82%and 8.89%(P<0.05),respectively.The loss rate of body weight increased and the survival rate decreased(P<0.05);the activity of protease and amylase in stomach and gut was decreased significantly(P<0.05);the crude fat in muscle was significantly decreased 7.23%((P<0.05) in 30 d,and there was no significantly change in 30~50 d after starvation stress(P>0.05).Meanwhile,the crude protein in muscle decreased 4.97%(P>0.05) in 30 d and then decreased sharply in 30~50 d(P<0.05).After starvation stess for 50 d,the crude protein was decreased 22.79% compared to that of the control group.The results indicated that under the starvation condition,the juvenile could tolerate starvation in a certain time by dropping the activity of digestive enzyme and mobilizing the nutrition deposited in liver and muscle.As the use up of the deposited nutrition,the body weight and the survival rate decreased.There was a negative quadric linear correlation between relative loss rate of weight and survival rate,the regression equation was y=-0.049x2+0.322x+99.73(R2=0.955).