Effects of Stocking Density,Feed Deprivation Duration and Dominance Hierarchies on Feeding Behavior of Procambarus clarkii
To gain a deeper understanding of the key factors influencing the feeding behavior of Procambarus clarkii,this study focused on three critical factors of aquaculture condition—stocking density,feed deprivation,and dominance hierarchy.Through comparative experiments,we chose the P.clarkii with an initial body net weight of(9.53±1.45)g and an equal sex ratio.Furthermore,we explored how these key factors interact synergistically to optimize and clarify the appropriate stocking density and feeding frequency for P.clarkii.The results showed that:(1)males of the same size have a higher dominance rank than females and are more likely to become dominant.The dominant individuals prefer to establish their hierarchy prior to catch food,while subordinate shrimps generally prefer the food first with a significantly longer feeding duration(P＜0.05);(2)the input of feeding powders significantly increase the frequency of fights over food(P＜0.001).The fighting behavior is increasing with stocking density and feed deprivation;(3)the feeding duration,attractiveness of feed,and consumption rate of P.clarkii significantly increase when increasing the stocking density and feeding duration.Unexpectedly,the number of fights first rises first and then decrease with the lactate expression in hemolymph of dominant shrimps lower than that of subordinate ones,corresponding to the different energy allocation during the metabolism of individual dominant hierarchy.In summary,this study revealed the effects of density,feeding,and dominance level on the feeding behavior of crayfish,which has important guiding significance for optimizing the aquaculture management of crayfish.
NETL
NSTL
万方数据
