Islam, Md Jakiul, Puebla, Oscar ORCID: https://orcid.org/0000-0001-9700-5841 and Kunzmann, Andreas ORCID: https://orcid.org/0000-0002-9500-4332 (2024) Nutritional mitigation of heatwave stress in European seabass, Dicentrarchus labrax: Metabolic, cellular, and molecular responses. Aquaculture Reports, 36 . p. 102168. DOI https://doi.org/10.1016/j.aqrep.2024.102168.

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Abstract

Climate change is fueling the perilous combination of heatwaves and prolonged drought and is now a reality affecting living organisms, including fish. The study aimed to investigate the effects of four dietary supplements on the European seabass, Dicentrarchus labrax, during an experimental heatwave. A total of 240 fish were allocated randomly to 15 tanks. Fish were fed for 56 days with diets supplemented with vitamins C (4.0 g kg-1) & E (3.5 g kg-1), propolis (4.5 g kg-1), phycocyanin (0.03 g kg-1), β-glucan (3.0 g kg-1) and a control diet, and then exposed to a 18 days heatwave (32 oC). Multilayer of physiological parameters were measured before and after extreme warm exposure. Before the experimental heatwave, fish weight gain did not differ significantly between the four tested diets and the control group. However, during extreme warm exposure, serum triglycerides, total protein, cholesterol, and expression of Igf1 and TNF-1α were significantly higher in fish fed diets supplemented with vitamins C & E, propolis, and phycocyanin than in fish fed control diet (p < 0.05). In contrast, serum cortisol, AST, ALT, LDH, ɣGGT, BUN, and creatine levels were found to be significantly lower (P<0.05) in fish fed diets supplemented with vitamins C & E, propolis, and phycocyanin. After heat stress, HSP70, and GLUT2 expression increased at varying degrees in fish fed all tested diets in comparison to the control diet, whereas FADS2 expression decreased. Nevertheless, the gene expression response was different in the kidneys. Overall, most of the tested parameters indicate that diets supplemented with vitamins C & E, propolis, or phycocyanin are beneficial for European seabass during exposure to extremely warm temperatures (32°C). These supplements alleviated the adverse effects of the heatwave, improving weight gain and metabolic activities at the cellular and molecular levels.

Document Type:	Article
Programme Area:	PA1
Research affiliation:	Ecology > Experimental Aquaculture Ecology > Fish Ecology and Evolution
Refereed:	Yes
Open Access Journal?:	Yes
DOI:	https://doi.org/10.1016/j.aqrep.2024.102168
ISSN:	23525134
Date Deposited:	22 Jul 2024 08:00
Last Modified:	22 Jul 2024 08:00
URI:	http://cris.leibniz-zmt.de/id/eprint/5448

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