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Turkish Journal of Fisheries and Aquatic Sciences 2020, Vol 20, Num, 5     (Pages: 331-340)

Alteration of Growth and Temperature Tolerance of European Sea Bass (Dicentrarchus labrax Linnaeus 1758) in Different Temperature and Salinity Combinations

Hatice Asuman Yilmaz 1 ,Serhat Turkmen 2 ,Metin Kumlu 1 ,Orhan Tufan Eroldogan 1 ,Nafiye Perker 3

1 Cukurova University, Department of Aquaculture, Faculty of Fisheries, 01330 Balcali Adana, Turkey
2 Universidad de Las Palmas de Gran Canaria, Grupo de Investigación en Acuicultura (GIA), Transmontaña s/n, 35413 Arucas, Las Palmas, Canary Islands, Spain
3 Mediterranean Fisheries Research Production and Training Institute, Kepez Unit, 07001 Antalya, Turkey
DOI : 10.4194/1303-2712-v20_5_01 Viewed : 5494 - Downloaded : 5978 This study was performed to assess the combined effects of three salinities (0, 20 and 38 ppt) and three acclimation temperatures (15, 20 and 25°C) on growth performance, proximate composition and thermal tolerance of European Sea Bass (32 g) inhabiting southern parts of the Mediterranean Sea. Highest fish final weight (83.8 g) was achieved at 25°C in freshwater (FW). Specific growth rate (SGR) at 25°C was about twice higher than that at 15°C, while 20°C promoted an intermediate growth. The fish cultured in FW at 25°C displayed consistently lower FCR and better SGR than those in full strength seawater (SW). Salinity had strong influence on fillet protein and lipid compositions. Highest lipid content (14.9%) was found in fish held in brackish water (20 ppt), and the fish held in SW had the lowest lipid content. CTMin and CTMax values ranged from 3.26°C to 7.33°C and from 31.81°C to 36.68°C, respectively. The thermal tolerance results indicated that European sea bass is more sensitive to high rather than low temperatures. These results suggested that this species can be farmed in stagnant SW deep ponds with high ambient temperatures during hot summer months in southern parts of the Mediterranean. During cold winter months, however, this fish can be successfully cultured in low salinities or even in FW. Keywords : CTMin, CTMax, Brackish water, Growth Performance, Thermal polygon