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Effect of diet on the development, survival, and reproduction of the calanoid copepod pseudodiaptomus dubia

Journal of Oceanology and Limnology 2019年第5期37卷 1756-1767页

作者： LUO Xiaoxia LI Changling HUANG Xianghu Department of Aquaculture Fishery CollegeGuangdong Ocean UniversityZhanjiang 524088China Engineering Technology Research Center for Algae Breeding and Application Zhanjiang 524088China Shenzhen Research Institute of Guangdong Ocean University Shenzhen 518108China

pseudodiaptomus dubia is a calanoid copepod abundant in the mariculture ponds of southern China. However, our understanding of the population dynamics of P . dubia in aquaculture ponds is limited. In this study, groups of larval P . dubia were each fed a diff erent microalgal species, and the eff ects of these diff erent diets on development, survival, and reproduction were assessed. The fi ve microalgae used were species common in aquaculture farms in China, and included two chlorophytes ( Chlorella saccharophila and Platymonas subcordiformis ), one golden microalga ( Isochrysis zhanjiangensis ), and two diatoms ( Chaetoceros muelleri and Cyclotella meneghiniana ). Our results indicated that C . saccharophila was not a suitable food for larval P . dubia , as all larvae fed this microalga died at stage III (as copepodites). The survival rates of P . dubia larvae fed C . muelleri , I . zhanjiangensis , and P . subcordiformis were signifi cantly higher than that of larvae fed C . meneghiniana . In the adult stage, copepods fed C . muelleri , I . zhanjiangensis , and C . meneghiniana produced more nauplii (430-566 nauplii/female), had higher intrinsic growth rates (0.2- 0.253/d), and better longevity (59-60 days) than those fed P . subcordiformis . Our results therefore suggest that P . dubia has diff erent nutritional needs and food preferences at diff erent life stages. For example, P . subcordiformis was suitable for developing larvae but not for breeding adults, while C . meneghiniana was suitable for breeding adults but not for developing larvae. Both C . muelleri and I . zhanjiangensis were excellent foods for P . dubia throughout the entire life cycle.

关键词： copepods development survival reproduction pseudodiaptomus dubia diet

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