期刊
出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpb.2021.110592
关键词
Aquaculture; Syngnathidae; Biochemistry; Oxidative stress; ROS
资金
- Coordination for the Improvement of Higher Education Personnel (CAPES, Brazil) through Programa de Excelencia Academica-PROEX
- Brazilian CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [307445/2016-0]
- CAPES
- research group Nutricion y alimentacion en peces (University of Granada) [RNM-156]
The study focused on the vulnerability of juvenile Seahorse Hippocampus reidi to acidic exposure in different salinity levels, with findings indicating higher cortisol levels in acidic conditions in brackish water and biochemical alterations at enzymatic level in seawater. Overall survival rates were above 90% and did not significantly differ among pH levels.
Seahorse Hippocampus reidi is a vulnerable species, inhabiting estuarine and coastal waters. The safety of acidic environments for fish has been considered in terms of ocean acidification in nature and decreasing pH in intensive aquaculture systems. This study aimed to investigate the effects of acute exposition (96 h) of juvenile seahorses to different pH (5, 6, 7, and 8) in brackish (BW - salinity 11) or seawater (SW - salinity 33). For that, we studied the responses of cortisol, oxidative stress, and survival, thus covering primary, secondary, and tertiary stress responses. In SW, cortisol levels were not altered for fish maintained at pH 5 and 8. However, in BW, cortisol was higher for fish kept at pH 5. Regarding secondary stress responses, only GST activity increased with acidification in SW. However, acidification in BW caused biochemical alterations at enzymatic level (SOD, GST, GPx) and glutathione metabolism, accompanied by reduction of antioxidant capacity (TEAC) and increased lipid peroxidation (TBARS). Survival was always above 90% and it did not differ significantly among pH levels. Our results suggest that H. reidi juveniles are more vulnerable to acidic exposure in BW than in SW.
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