| Autor: |
Cheyadmi S; Research Team in Biological Engineering, Agri-Food and Aquaculture, Department of Biology, Polydisciplinary Faculty of Larache, Abdelmalek Essaâdi University, Tetouan 93030, Morocco., Chadli H; Aqua M'diq Marine Fish Farm, M'diq 93200, Morocco., Nhhala H; Department of Earth Sciences, Faculty of Sciences and Technologies of Tangier, Abdelmalek Essaâdi University, Tetouan 93030, Morocco., El Yamlahi B; Laboratory of Biomedical Genomics and Oncogenetics, Faculty of Sciences and Technologies of Tangier, Abdelmalek Essaâdi University, Tetouan 93030, Morocco., El Maadoudi M; Regional Laboratory for Analysis and Research-National Office for Food Safety ONSSA, Tangier 90000, Morocco., Kounnoun A; Regional Laboratory for Analysis and Research-National Office for Food Safety ONSSA, Tangier 90000, Morocco., Cacciola F; Department of Biomedical, Dental, Morphological and Functional Imaging Sciences, University of Messina, 98125 Messina, Italy., Ez-Zaaim A; Regional Laboratory for Analysis and Research-National Office for Food Safety ONSSA, Tangier 90000, Morocco., Chairi H; Research Team in Biological Engineering, Agri-Food and Aquaculture, Department of Biology, Polydisciplinary Faculty of Larache, Abdelmalek Essaâdi University, Tetouan 93030, Morocco. |
| Abstrakt: |
Globally, aquaculture contributes to sustainable food and nutritional stability. However, stress conditions constitute a major threat affecting farmed-fish welfare and fish farms’ performances. In this regard, the present study was aimed at measuring and comparing in-situ (offshore) the physiological stress responses caused by recurrent sampling operations for length−weight measurement. Studied fish were European sea bass Dicentrarchus labrax sub-adults and adults reared in intensive farming conditions in M’diq Bay, on the Moroccan Mediterranean coast. The physiological stress response was evaluated by measuring blood biomarkers, including cortisol, glucose, lactate, total cholesterol and total proteins levels, and hematocrit percentage. The hypercortisolemia, hyperglycemia, hyperlactatemia and hypoproteinemia detected in the post-sampling state in both age groups of D. labrax indicated stress tendencies and a high sensitivity to aquaculture practice-related stress factors, with major and minor responses detected in the same age and same stress conditions. It is also interesting to note that the fish age and the time-course of the sampling operation had a statistically significant effect in terms of the physiological response (with p < 0.01 and p < 0.001, respectively). In conclusion, the present study showed that sea bass subjected to various stressful situations in intensive farming conditions displayed a physiological stress response specific to its age, to the individual status, as well as to the duration of stressor. |
