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Striated murrel Channa striatus were injected with natural hormones (pituitary extract and human chorionic gonadotropin) and synthetic hormones (luteinizing hormone releasing hormone analogue and ovaprim). When compared to the LHRHap and ovaprim, the latency period was long in pituitary- (24 h) and HCG-injected (26 h) fish. In the pituitary-injected C. striatus the percentage of fertilisation was...
The authors investigated the carotenoids content in yellow, yellow-orange, and orange eggs of salmon (Salmo salar L.) and brown trout (Salmo trutta L.) entering Polish rivers for spawning or reared in fresh water. The study shows the presence of females of both salmon and brown trout with the M74 syndrome.
Background. Melatonin regulates various physiological and neuroendocrinological processes that occur rhythmically, and stimulates or inhibits endocrine activity of various body glands. This acts on the hypothalamic-pituitary-gonadal axis by synchronizing animals with their reproductive cycles. The proximity of melatonin receptors and dopamine and gonadoliberin production sites has led to a hypothesis...
Background. The usage of common carp pituitaries has been associated with very high costs, resulting from sacrificing the valuable broodstock. A close taxonomic proximity between the Common carp, Cyprinus carpio L., and Prussian carp, Carassius gibelio (Bloch, 1782), reflected in the presence of high levels of the homologous carp LH hormone in Prussian carp pituitaries, was recently demonstrated....
Background. Loach fishes, Cobitis sp., are found in the majority of streams in the southern Caspian Sea basin, but reproductive parameters of them are barely known. Reproductive conditions are key parameters of fish populations and their assessment is very important for several reasons. Therefore, the main aim of this study was to obtain reproductive characteristics of this fish which will be a first...
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