Influence immédiate du brossage des bacs sur certains paramètres sanguins du loup d'elevage, Dicentrarchus labrax L.: Effet de stress

Changes in serum cortisol, metabolites, osmotic pressure and electrolytes in response to different blood sampling procedures in cultured sea bass (Dicentrarchus labrax L.)

“…Cumulative stressors involved in blood sampling can evoke a rapid stress response in sea bass and induce substantial variation in blood constituent concentration. Similar elevations in glucose levels have been observed in sea bass subjected to acute stress (Hadj Kacem et al 1986;Marino et al 1989) and to chronic osmotic stress (Roche et al 1989). Rapid increases in the cortisol level within 8±15 min after handling or other physical disturbance are reported in several marine teleosts such as¯ounder Platichthys esus, and Atlantic salmon Salmo salar (Waring et al 1992), and blue mao mao Scorpis violaceus ).…”

“…Rapid increases in the cortisol level within 8±15 min after handling or other physical disturbance are reported in several marine teleosts such as¯ounder Platichthys esus, and Atlantic salmon Salmo salar (Waring et al 1992), and blue mao mao Scorpis violaceus ). Hypernatremia, hyperchloremia, and consequently hyperosmolality have been reported in other marine teleosts (Eddy 1981;Milligan 1992, 1997) and in sea bass as a consequence of handling and severe exercise (Hadj Kacem et al 1986). The magnitude and time of cortisol increase is consistent with that reported by Marino et al (1989), who observed increases in serum cortisol concentration of nearly 400% and over 1000% in sea bass con®ned and crowded for 15 and 45 min, respectively.…”

“…Some studies have used variations in blood constituents to investigate the response of sea bass to environmental change (Hadj Kacem et al 1987;Roche et al 1989;Planas et al 1990;Venturini et al 1992), to handling and transportation (Marino et al 1989) and to acute stress (Hadj Kacem et al 1986). Some studies have used variations in blood constituents to investigate the response of sea bass to environmental change (Hadj Kacem et al 1987;Roche et al 1989;Planas et al 1990;Venturini et al 1992), to handling and transportation (Marino et al 1989) and to acute stress (Hadj Kacem et al 1986).…”

Husbandry stress during early life stages affects the stress response and health status of juvenile sea bass, Dicentrarchus labrax

“…Plasma cortisol levels did not change which suggests the occurrence of a ''fight or flight'' stress response (review in [5]). Others have reported [31] that following 5 min scrubbing the tank walls, Dicentrarchus labrax juveniles displayed a secondary stress response comparable to consequences of a severe non-hypoxic exercise, characterised by an increase in several haematological parameters including glycaemia, proteinaemia, haematocrit and haemoglobinaemia. These data combined with our findings suggest adrenergic function, which in teleosts is very responsive to stress and results in an increase of plasma catecholamines (CAs) within a few minutes.…”

Haematological, biochemical and immunological parameters as stress indicators in Dicentrarchus labrax and Sparus aurata farmed in off-shore cages

“…Studies on this issue have recognised that stress has significant implications for fish reproduction and growth (Pankhurst and Van der Kraak 1997); it is known to induce changes in physiological parameters, selected as indicators, such as haemoglobin content, plasma cortisol, glucose and lactate (Hady Kacem et al 1986;Wells and Pankhurst 1999). Stressful conditions negatively affect both specific and nonspecific immunity, making fish more susceptible to disease (Pickering and Pottinger 1989).…”