Changes in blood cortisol, glucose and lactate in carp retained in anglers' keepnets

Abstract

Running title: physiological effects of keepnet confinement 2 Capture of carp from holding tanks by dip-net, or from semi-natural conditions by rod and line, elicits a physiological stress response characterised by elevation of plasma cortisol levels.The transfer of carp to keepnets subsequent to capture does not increase or reduce the magnitude or duration of this response and in both cases plasma cortisol levels have returned to pre-stress levels within 24 hours of the initial disturbance. The post-capture plasma cortisol elevation is accompanied by disturbances in plasma glucose and lactate levels but these are less consistent in severity and duration than the cortisol response. These data suggest that the retention of fish in keepnets following capture, does not represent a source of stress additional to that imposed by capture and has no effect on the rate of recovery of the fish from the initial capture stress.

The hematological response to exhaustive exercise in ‘all-fish’ growth hormone transgenic common carp (Cyprinus carpio L.)

“…Resting plasma glucose and lactate concentrations did not differ between transgenic and non-transgenic carp, and values were comparable to those from other studies on carp (Pottinger, 1998;Ruane et al, 2001Ruane et al, , 2002. Both groups exhibited a typical secondary metabolic stress response to exhaustive exercise, as indicated by elevated plasma glucose and lactate concentrations (Barton, 2002;Iwama et al, 2004;Portz et al, 2006), but transgenic fish appeared to clear lactate more quickly than controls.…”

High Blood Cortisol Levels and Low Cortisol Receptor Affinity: Is the Chub, Leuciscus cephalus, a Cortisol-Resistant Teleost?

“…These data show that levels of cortisol in unstressed chub (50 -100 ng ml -1 ) are of a similar order of magnitude to, or higher than, those in other cyprinid species such as the common carp (Dabrowska et al, 1991;van Dijk et al, 1993;Pottinger, 1998) and are far in excess of cortisol levels in unstressed salmonid fish (10 ng ml -1 ; Barton and Iwama, 1991).…”

“…The available data are limited to only a few species but in these cyprinids at least, both basal and stress-induced cortisol levels are markedly higher than those reported for salmonids. Cortisol levels in unstressed common carp (Cyprinus carpio) have been reported to be 50 -150 ng ml -1 , rising to 300 -450 ng ml -1 during exposure to stressors (Dabrowska et al, 1991;van Dijk et al, 1993;Pottinger, 1998). In another cyprinid species, the roach (Rutilus rutilus), baseline cortisol levels are similar to those observed in salmonid fish (10 ng ml -1 ) while exposure to a stressor increases plasma cortisol to levels as high as 700 ng ml -1 .…”

Réponses Physiologiques De Sept Espèces De Poissons Lacustres À Un Stress De Capture (Filet Maillant Et Épuisette).

“…Ainsi, les effets inhérents à une capture par pêche à la ligne ou à la cuiller (e.g., FERGUSON et TUFTS, 1992 ;YOUNGSON et WEBB, 1993 ;PANKHURST et DEDUAL, 1994 ;YOUNG et al, 1994 ;KIEFFER et al, 1995 ;BROBBEL et al, 1996 ;DEDUAL, 1996 ;LOWE et WELLS, 1996 ;WILKIE et al, 1996 ;POTTINGER, 1998), par plongeur sous-marin (e.g., BOLLARD et al, 1993), nasse (e.g., HOPKINS et CECH, 1992), senne (e.g., LEATHERLAND et al, 1989), chalut (e.g., TU RUN EN et ai., 1994OLLA et al, 1997), tramail (e.g., EGGINTON, 1994CHOPIN et al, 1996) ou pêche électrique (e.g., MESA et SCHRECK, 1989 ;MAULE et MESA, 1994 ;MITTON et MCDONALD, 1994 ;SNYDER, 1995 ;BARTON et GROSH, 1996 ;BARTON et DWYER, 1997 ;MUTH et RUPPERT, 1997) ont-ils été appréciés et quantifiés chez de nombreuses espèces pisciaires par des mesures d'indicateurs classiques de l'état de stress (i.e., catecholamines, Cortisol, glucose, lactate ;WEDEMEYER et al, 1990). L'utilisation de filets maillants, engins de pêche passifs, a été préconisée par l' EIFAC (1975) et citée par BARBIER (1985) pour certaines investigations dans les lacs, réservoirs et milieux potamiques.…”