title: Effects of Cryptocaryon irritans infection on the survival, feeding, respiratory rate and ionic regulation of the marbled rockfish Sebastiscus marmoratus.
abstract: To clarify the effects of a Cryptocaryon irritans infection on the physiological functions of the marbled rockfish Sebastiscus marmoratus, this study utilized C. irritans at concentrations of 2500; 5000; 7500; 10,000; 20,000; and 30,000 theronts/fish to infect marbled rockfish weighing 45 ± 3 g. The survival rate, food intake, respiratory rate, serum ion concentrations and gill Na+/K+-ATPase activity were determined. With the increase of the infection concentration and the passage of time, the survival rate of the rockfish gradually decreased. The groups infected with more than 5000 theronts/fish had stopped feeding within 4 days. The respiratory rates of the fish in the groups infected with 2500 and 5000 theronts/fish initially increased and then decreased. In contrast, the respiratory rate of the fish in the groups infected with more than 7500 theronts/fish was elevated to levels significantly higher than the control group after 12 h. The Na+/K+-ATPase activity and serum Na+ and Cl- concentrations increased with increasing infection concentration. In conclusion, the physiological functions of the fish infected with low concentrations of C. irritans can be effectively restored, whereas a high concentration infection induced severe stress. The declined food intake and accelerated respiratory rate could be useful for an early warning system as important indicators.
authors.affiliation: Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, People's Republic of China.
authors.forename: Fei
authors.initials: F
authors.lastname: Yin
authors.affiliation: Key Laboratory for Aquatic Products Safety of Ministry of Education, State Key Laboratory of Biocontrol, The School of Life Sciences, Sun Yat-sen University, 135 Xingang West Street,Haizhu District, Guangzhou, Guangdong Province 510275, People's Republic of China.
authors.forename: Qiyang
authors.initials: Q
authors.lastname: Gong
authors.affiliation: Key Laboratory for Aquatic Products Safety of Ministry of Education, State Key Laboratory of Biocontrol, The School of Life Sciences, Sun Yat-sen University, 135 Xingang West Street,Haizhu District, Guangzhou, Guangdong Province 510275, People's Republic of China.
authors.forename: Yanwei
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Animal Science, South China Agricultural University, Guangzhou, Guangdong Province 510642, People's Republic of China.
authors.forename: Xueming
authors.initials: X
authors.lastname: Dan
authors.affiliation: Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Sun
authors.affiliation: Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, People's Republic of China.
authors.forename: Quanxin
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, People's Republic of China.
authors.forename: Zhaohong
authors.initials: Z
authors.lastname: Shi
authors.affiliation: Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation, Ministry of Agriculture, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, People's Republic of China.
authors.forename: Shiming
authors.initials: S
authors.lastname: Peng
authors.affiliation: Key Laboratory for Aquatic Products Safety of Ministry of Education, State Key Laboratory of Biocontrol, The School of Life Sciences, Sun Yat-sen University, 135 Xingang West Street,Haizhu District, Guangzhou, Guangdong Province 510275, People's Republic of China.
authors.forename: Anxing
authors.initials: A
authors.lastname: Li
mesh_terms: D000818:Animals; D016798:Ciliophora / Q000502:physiology*; D016770:Ciliophora Infections / Q000469:parasitology / Q000662:veterinary*; D005247:Feeding Behavior; D005393:Fish Diseases / Q000469:parasitology / Q000503:physiopathology*; D005880:Gills / Q000469:parasitology; D007477:Ions / Q000097:blood; D010473:Perciformes / Q000469:parasitology*; D056152:Respiratory Rate; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D007477:Ions; D000254:Sodium-Potassium-Exchanging ATPase