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Título
Seasonal and sex-related variations in serum steroid hormone levels in wild and farmed brown trout Salmo trutta L. in the north-west of Spain
Autor
Facultad/Centro
Área de conocimiento
Datos de la obra
Journal of water and health, 2013, vol. 11, n. 4
Editor
IWA publishing
Fecha
2013-12-15
Abstract
Serum steroid profiles were investigated in order to evaluate the potential use of circulating sex
steroid levels as a tool for sex identification in brown trout. Changes in the serum concentrations of
testosterone (T), progesterone (P), 17-β-estradiol (E2), and cortisol (F) in wild and farmed mature
female and male brown trout, Salmo trutta L., were measured in each season (January, May, July,
and October) in six rivers and four hatcheries located in the north-west of Spain. Serum cortisol levels
in farmed brown trout were significantly higher and showed a seasonal pattern opposite to that
found in wild trout. Because levels of the hormones under study can be affected by disruptive factors
such as exposure to phytoestrogens (which alters the hypothalamic–pituitary–gonadal axis) and
infection with Saprolegnia (which alters the hypothalamic–pituitary–adrenal axis), both factors are
taken into account.
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JWH 2013, 720-728 (Seasonal and sex-related variations in serum steroid hormone levels in wild..)