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Turkish Journal of Fisheries and Aquatic Sciences 2018, Vol 18, Num, 1     (Pages: 143-151)

Effects of Acute and Chronic Air Exposure on Growth and Stress Response of Juvenile Olive Flounder, Paralichthys olivaceus

Han Kyu Lim 1 ,Jun Wook Hur 2

1 Marine and Fisheries Resources, Mokpo National University, 1666 Youngsan-ro, Cheonggye, Muan, Jeonnam 58554, Korea
2 Bio-Monitoring Center, 202 ho, 49, 1730 Beon-gil, Dongseodae-ro, Dong-gu, Daejeon, 300-805, Korea
DOI : 10.4194/1303-2712-v18_1_16 Viewed : 523 - Downloaded : 371 We studied the effects of acute and chronic exposure to air on the growth and stress response of juvenile olive flounder, Paralichthys olivaceus. To study the stress response, the water was completely drained from the experimental tank, and the stressed group was exposed to air for 5 minutes, after which the tank was refilled with water. This stress was repeated daily for 30 days (between 1200 and 1300 h). From day 31 to day 69, no stress was applied. On day 70, the fish were again exposed to the air. The non-stressed group was not subjected to air exposure during the 70 days. We measured cortisol, glucose and lactic acid levels, osmolality, growth, survival, and feeding responses during the 70-day test period. Our results showed that olive flounder exhibit “typical” physiological responses (in cortisol, glucose, and lactic acid levels and osmolality) to the acute stress induced by air exposure. The response to chronic stress showed a similar increasing tendency. However, the incremental rate of increase decreased as the stress continued. Adverse stress effects, in terms of growth, survival, and response to food, were higher in the stressed than the non-stressed group. The effects of chronic stress from air exposure remained for 20 days after the stressor was terminated. These results will help to minimize stress from aquaculture activities in olive flounder farm. Keywords : olive flounder, air exposure, chronic stress, feed effects, growth