Steroids and “steroid-like” substances in fish diets
Identifieur interne : 000F67 ( Istex/Curation ); précédent : 000F66; suivant : 000F68Steroids and “steroid-like” substances in fish diets
Auteurs : C. Pelissero [Royaume-Uni] ; J. P. Sumpter [Royaume-Uni]Source :
- Aquaculture [ 0044-8486 ] ; 1992.
Abstract
Abstract: The various animal and plant sources of steroids and “steroid-like” substances present in fish diets are reviewed along with an assessment of physiological mechanisms of action and their potential effects on fish. It is concluded that most, if not all, diets used in fish culture will contain measurable amounts of these compounds. The compounds are absorbed through the gut wall and enter the enterohepatic circulation either intact or in conjugated form. In the liver, some forms are detoxified but the liver is also a likely target of these compounds. It is possible that the steroidal compounds, once absorbed, stimulate the production of vitellogenin and steroid-binding proteins, the latter in turn enhancing the accumulation of steroids. Natural steroids and “steroid-like” substances absorbed via the diet appear to affect reproductive development and growth, but the data are not fully conclusive yet. Studies with sturgeon indicate that dietary phytoestrogens are estrogenic in fish and can induce vitellogenesis. Additional fish studies are required to evaluate the significance of observed effects, but the presence of steroids and “steroid-like” substances must be kept in mind when new diets are formulated or when work on the physiological effects of steroids in wild or cultured fish is being conducted.
Url:
DOI: 10.1016/0044-8486(92)90078-Y
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