title: Effect of rearing temperature on growth and thermal tolerance of Schizothorax (Racoma) kozlovi larvae and juveniles.
abstract: Effect of rearing temperature on growth and thermal tolerance of Schizothorax (Racoma) kozlovi Nikolsky larvae and juveniles was investigated. The fish (start at 12d post hatch) were reared for nearly 6 months at five constant temperatures of 10, 14, 18, 22 and 26°C. Then juvenile fish being acclimated at three temperatures of 14, 18 and 22°C were chosen to determine their critical thermal maximum (CTMax) and lethal thermal maximum (LTMax) by using the dynamic method. Growth rate of S. kozlovi larvae and juveniles was significantly influenced by temperature and fish size, exhibiting an increase with increased rearing temperature, but a decline with increased fish size. A significant ontogenetic variation in the optimal temperatures for maximum growth were estimated to be 24.7°C and 20.6°C for larvae and juveniles of S. kozlovi, respectively. The results also demonstrated that acclimation temperature had marked effects on their CTMax and LTMax, which ranged from 32.86°C to 34.54°C and from 33.79°C to 34.80°C, respectively. It is suggested that rearing temperature must never rise above 32°C for its successful aquaculture. Significant temperature effects on the growth rate and thermal tolerance both exhibit a plasticity pattern. Determination of critical heat tolerance and optima temperature for maximum growth of S. kozlovi is of ecological significance in the conservation and aquaculture of this species.
authors.affiliation: Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei 430223, China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: He
authors.affiliation: Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei 430223, China.
authors.forename: Xingbing
authors.initials: X
authors.lastname: Wu
authors.affiliation: Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei 430223, China.
authors.forename: Yongjiu
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei 430223, China.
authors.forename: Haocheng
authors.initials: H
authors.lastname: Li
authors.affiliation: Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei 430223, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, Hubei 430223, China. Electronic address: yangdg@yfi.ac.cn.
authors.forename: Deguo
authors.initials: D
authors.lastname: Yang
mesh_terms: D000064:Acclimatization / Q000502:physiology; D000222:Adaptation, Physiological / Q000502:physiology; D000375:Aging / Q000502:physiology; D000818:Animals; D001833:Body Temperature Regulation / Q000502:physiology*; D003530:Cyprinidae / Q000196:embryology / Q000254:growth & development* / Q000502:physiology*; D007814:Larva / Q000254:growth & development / Q000502:physiology
keywords: Growth; Schizothorax (Racoma) kozlovi Nikolsky; Temperature; Thermal tolerance