Chemical fish sex

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Metrics details. Gonochorist teleosts are teleosts in which individuals develop either as males or as females, and are sexually stable thereafter throughout ontogeny. However, there is a labile period, defined as the time period prior to hatching through juvenile stage before sexual maturation adulthood , during which gonadal sex differentiation can be influenced by environmental conditions, including exogenous chemical treatments. Usually, during this period, depending on the nature of chemical treatment, gonadal sex can be reversed from one phenotypic sex to another.
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Why Are These Male Fish Growing Eggs?

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Fish Reproductive Pheromones | SpringerLink

Two sets of tracks—fox and mouse—weave across the snowy surface of the river, which is home to bass, muskrats, and beavers. Sixty miles south of Montreal, near the U. Yet even here, scientists have found an abundance of fish with bizarre abnormalities that suggest exposure to hormone-disrupting water pollution. Scientists from the U. Fish and Wildlife Service and the U.
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Fish Reproductive Pheromones

Chemical Signals in Vertebrates 4 pp Cite as. Chemical communication in fish is known or suspected to be involved in a wide range of functions including general social attraction, species and individual recognition, parent-young interactions, alarm or fright reactions, migration, and a variety of reproductive responses including stimulation of spawning readiness, sexual attraction, and elicitation of courtship behavior Colombo et al. We will deal exclusively with reproductive aspects of chemical communication in fish i. Emphasis will be placed on developments which have occurred since the publication of earlier reviews, with particular attention being given to the possible chemical nature of fish reproductive pheromones, the information which these chemical signals might transmit, and the mode of action by which they are thought to induce the observed reproductive responses. As little is known of many of these aspects of chemical communication in fish, it is hoped that the present article will serve as a focus and stimulus for further research in this area.
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Studies on the chemical composition of adult pollan were carried out monthly from January to December Sex, weight of scaled fillet, and gonads were examined in fish. Chemical composition which includes water, fat and ash content was analysed in the whole fish, muscle and gonads.
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