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Influence of stock density on digestive enzyme activity (trypsin), heat shock protein 70 (HSP70), and oxidative stress biomarkers of narrow clawed crayfish, Astacus leptodactylus Eschscholtz, 1823 (Decapoda, Astacidae)

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Stocking density causes changes in behaviour and physiology of aquatic animals and high density can cause oxidative damage in living cells. Therefore, experiments were designed to investigate the effects of stocking density on the oxidant-antioxidant response (glutathione (GSH), glutathione peroxidase (GSH-Px), catalase (CAT), and malondialdehyde (MDA)), digestive enzyme activity (trypsin), and heat shock protein 70 (HSP70) of narrow clawed crayfish (Astacus leptodactylus). The experiment was conducted to assess effects by stocking 3, 6, 9 and 12 crayfish/m2. Crayfish were stocked into 12 fiberglass tanks, three replicates per treatment and fed for 45 days. Our results indicated that activity of GSH-Px, MDA, and GSH levels increased in hepatopancreas (p<0.05) and muscle tissues (p<0.05) with increasing stock concentration while CAT activity decreased (p<0.05). Trypsin and HSP70 insignificantly increased in haemolymph. In conclusion, oxidative stress biomarkers were negatively influenced by increased quantitative changes in stocking density.

Affiliations: 1: 1Tunceli University, Fisheries Faculty, 62000 Tunceli, Turkey ; 2: 2Fırat University, Faculty of Veterinary, Department of Basic Sciences, Elazığ, Turkey ; 3: 3Tunceli University, Faculty of Engineering, Department of Food Engineering, 62000 Tunceli, Turkey

4Corresponding author; e-mail:

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