Salinization intensifies the effects of elevated temperatures on Channa striata , a common tropical freshwater aquacultu
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ORIGINAL ARTICLE Aquaculture
Salinization intensifies the effects of elevated temperatures on Channa striata, a common tropical freshwater aquaculture fish in the Mekong Delta, Vietnam Tran Thi Phuong Lan1 · Tran Thi Thanh Hien1 · Tran Le Cam Tu1 · Nguyen Van Khanh1 · Yutaka Haga2 · Tran Minh Phu1 Received: 1 April 2020 / Accepted: 12 August 2020 © Japanese Society of Fisheries Science 2020
Abstract Increasing water temperatures and salinity intrusion due to climate change are serious challenges for freshwater aquaculture. In this study, we assessed the combined effects of salinization at 0, 6, and 9‰ and water temperatures of 28, 31, and 34 °C on the survival and growth rates, and feed utilization, of freshwater snakehead Channa striata. We also assessed feed digestibility in snakeheads to explore their physiological mechanisms. The lowest survival rate (66.7%) was found at 34 °C-9‰. The highest daily weight gain of 0.72 g/day was found at 34 °C-0‰, while the second highest (0.62 g/day) was at 31 °C-0‰. Chymotrypsin activity increased at higher temperatures; the activities of α-amylase and pepsin were lowest at 34 °C-9‰. The highest apparent digestibility coefficients (ADCs) for dry matter (80.3%), protein (95.3%), and lipid (97.9%) were observed at 31 °C-0‰ (p
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