投喂频率对红鳍东方鲀生长和行为的影响

FEEDING FREQUENCY ON THE GROWTH AND BEHAVIOR OF TAKIFUGU RUBRIPES

  • 摘要: 以红鳍东方鲀(Takifugu rubripes)幼鱼为实验对象, 研究在日投喂量相同的条件下, 不同投喂频率3次/d(F3)、4次/d(F4)和5次/d(F5)对幼鱼生长和行为的影响。结果表明: (1) F4组幼鱼的生长性能显著高于F3和F5组 (P<0.05); (2) 在实验结束时, 不同处理组幼鱼的游泳速度差异显著, 从大到小依次为F4>F3>F5(P<0.05), F4组幼鱼的角速度显著高于F3和F5组(P<0.05), F4组幼鱼的加速度和活跃度显著低于F3和F5组(P<0.05), F3组幼鱼的对象间距离显著高于F4和F5组(P<0.05); (3) GLMMs的结果表明, F4组幼鱼的游速受到实验时间与投喂频率交互效应的影响显著(P<0.05), 各处理组之间的比较结果显示, 实验时间和投喂频率的交互效应对F5组幼鱼的加速度有正向效果, 但其显著降低了F5组幼鱼的对象间距离。综上所述, 不同投喂频率对幼鱼的生长性能和行为表现具有显著影响。实验推测4次/d的投喂频率可能改变了幼鱼的能量分配, 更多的能量被用于生长和游泳, 使得幼鱼的生长性能有所提高, 并且增强了鱼群的整体凝聚力和稳定性。因此, 建议红鳍东方鲀幼鱼的投喂频率为4次/d, 并且可以将游速和对象间距等指标作为监测红鳍东方鲀摄食行为的主要参数。

     

    Abstract: This study was to investigate the effects of different feeding frequencies on the growth performance and behavioral responses of juvenile Takifugu rubripes. We exposed the juveniles to three distinct feeding frequencies, namely: F3 (3 times/d×20 g/time), F4 (4 times/d×15 g/time), and F5 (5 times/d×12 g/time) over a period of 28d. The initial body length and weight of juveniles were measured at (6.9±0.9) cm and (11.56±1.5) g, respectively. At the end of feeding period, the final body length and weight were assessed, and their growth performance and behavioral responses were analyzed. The study revealed that feeding frequency of 4 times/d (F4) resulted in the best growth performance of the juveniles, as evidenced by their significantly higher final body length, weight, and specific growth rate compared to the other groups (P<0.05). Additionally, the swimming velocity of juveniles in the F4 group was significantly higher than that of the other groups (P<0.05), indicating a positive effect on their performance. The angular velocity of the F4 group was also significantly higher than that of the F3 and F5 groups (P<0.05), further suggesting an improvement in their swimming ability. However, the activity level of the juveniles in the F4 group was significantly lower than that of the F3 and F5 groups (P<0.05), indicating a decrease in overall activity level. This may suggest that the F4 feeding frequency resulted to a redistribution of energy allocation in the juveniles, with more energy being directed towards growth and swimming performance rather than activity. Furthermore, the GLMMs analysis revealed that the velocity of juveniles in the F4 group was significantly affected by the interaction between time and feeding frequency (P<0.05), indicating a time-dependent effect of feeding frequency on the swimming performance of the juveniles. Overall, the study demonstrates that different feeding frequencies have significant effects on the growth performance and behavioral responses of Takifugu rubripes juveniles. The results suggest that the F4 feeding frequency, with a feeding frequency of 4 times/d and a feeding amount of 15 g/time, is the most effective feeding strategy for promoting the growth and swimming performance of juvenile Takifugu rubripes. Moreover, the study highlights the potential of behavioral indicators such as swimming velocity and spacing as useful tools for monitoring the response of Takifugu rubripes juveniles to different feeding frequencies.

     

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