Capture and Confinement Stress in White Sucker Exposed to Bleached Kraft Pulp Mill Effluent

Timing of Atlantic cod Gadus morhua seasonal migrations in relation to serum levels of gonadal and thyroidal hormones

“…It appears that capture stress has a minimal effect on the circulating levels of both T 4 and T 3 (see Comeau et al 2000). Capture stress, however, is known to reduce the levels of gonadal hormones in various fishes (Pickering et al 1987, Pankhurst & Dedual 1994, Jardine et al 1996, Clearwater & Pankhurst 1997, Morehead 1998). Yet we note that testosterone levels in field-collected cod (this study) were generally higher than those reported for laboratory-held cod .…”

“…Yet we note that testosterone levels in field-collected cod (this study) were generally higher than those reported for laboratory-held cod . For cod, it may be that confinement stress (e.g., Pickering et al 1987, Jardine et al 1996, Clearwater & Pankhurst 1997 head 1998, Haddy & Pankhurst 1999) has a greater impact on gonadal hormones than capture stress. Also, gonadal hormones in our study co-varied with the GSI in a manner consistent with other reports involving marine demersal fishes (Campbell et al 1976, Wingfield & Grimm 1977, Johnson et al 1991, Harmin et al 1995.…”

Sex-specific Cortisol and Sex Steroids Responses in Stressed Sockeye Salmon during Spawning Period

“…In teleosts, cortisol is a major stress hormone and its plasma level increases are positively correlated with stress levels (Billard and Gillet, 1981;Pickering et al, 1982;Sumpter et al, 1986). Many studies of adult salmon also reported a correlation between plasma cortisol concentration and stress (Billard and Gillet, 1981;Pickering et al, 1982, Barry et al, 1995Pickering and Pottinger, 1987a,b;Carragher et al, 1989;Carragher and Sumpter, 1990;Foo and Lam, 1993;Chopin et al, 1996;Jardine et al, 1996;Waring, et al, 1997, Carruth et al, 2000. Acute handling and confinement (stressors) of juvenile and immature Atlantic salmon for 3 hours is accompanied by an increase concentration of plasma cortisol (Carey and McCormick, 1998).…”

Plasma cortisol and 17β‐oestradiol levels in roach exposed to acute and chronic stress

“…If physiological data are to be collected from populations of fish in the natural environment it is essential that the range of a given physiological parameter in a target species is established in individuals under controlled conditions, both undisturbed and subject to disturbance. The interpretation of data collected in the field will be difficult otherwise and may be confounded by a lack of appreciation of capture-related changes in the parameters of interest (Jardine et al, 1996). While it is therefore possible to predict in qualitative terms, based on existing data for other teleost species, the response of roach, Rutilus rutilus (L.), to acute and chronic stressors, the quantitative characteristics of the response in this particular species remain to be determined.…”