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http://dx.doi.org/10.5657/KFAS.2022.0688

Physiological and Histological Changes of Overfeeding-induced Obese Rainbow Trout Oncorhynchus mykiss  

Park, Jiyeon (Department of aquatic life medicine, Pukyong National University)
Roh, Heyong Jin (Department of aquatic life medicine, Pukyong National University)
Park, Junewoo (Department of aquatic life medicine, Pukyong National University)
Jeong, Dahye (Department of aquatic life medicine, Pukyong National University)
Lee, Mu Kun (Korean Aquatic Organism Disease Inspector Association)
Kim, Do-Hyung (Department of aquatic life medicine, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.55, no.5, 2022 , pp. 688-696 More about this Journal
Abstract
Obesity could cause immune-physiological disorders in fish. Yet, little is known about the impact of obesity on stress and histological responses. This study aimed to determine histological and physiological changes in and vulnerability of overfeeding-induced obese rainbow trout Oncorhynchus mykiss exposed to stress condition. Control, intermediate and overfed groups were fed at 1.5, 2.5 and 3.09% of their body weight per day, respectively, for eight weeks. Weight gain, body mass index, hepatosomatic index and serological parameters, and histology of liver were measured in five fish from each group at week 0, 2, 4, and 8. At week 8, 20 fish from each group were exposed to heat stress by increasing water temperature at a rate of 3℃ per day from 15 to 25℃ and maintaining the final temperature for 10 days. Overall, overfed fish showed significantly higher weight gain, body mass index, and serological parameters than those of fish in the other groups. Fish in the overfed and intermediate groups displayed multifocal infiltration of inflammatory cells in hepatic parenchyma. Mortality rate and serological parameters of fish in the overfed group exposed to heat stress were significantly higher than those of fish in the other groups, indicating increased vulnerability to environmental stress.
Keywords
Rainbow trout; Overfeeding; Obesity; Heat stress; Serological parameter;
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