Sex and maturity

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The culture of Atlantic wolffish and spotted wolffish has many comparative advantages. However, the development of a wolffish culture industry will only be successful if a stock of health spawners is available to ensure the production of a sufficient number of wolffish weighing several tens of grams for culture trials by the industry at the regional or national level. That will require a good knowledge of the maturation and reproduction cycle.

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Sexual maturity is the capability of an organism to reproduce. It may be considered synonymous with adulthood[1] but, in humans, puberty encompasses the process of sexual maturation and adulthood is based on cultural definitions. Most multicellular organisms are unable to sexually reproduce at birth or germinationand depending on the species, it may be days, weeks, or years until their bodies are able to do so.

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Sex steroids appear to be responsible for hyperactivation of the hypothalamus-pituitary-interrenal HPI axis that occurs in mature semelparous Pacific salmon as a prelude to post-spawning programmed death. This study was undertaken to examine the direct effects of sex steroids on interrenal activity of semelparous chinook salmon and iteroparous rainbow trout salmonids using an in vitro incubation system. In addition, phenotypic sex differences in cortisol production by interrenals of sexually mature spawning rainbow trout and chinook salmon were investigated.

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Ok, I was thinking about this idea: is sex an indispensable part of grow up? Do you think that we become different? Changed after having sex for the first time?

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She misunderstood, of course, and said, ''The agreement was either we'd eat out three times a week or you'd learn to cook. I worried about the children. Psychologists say children hate the thought of a parent having any sex life at all.

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In cooperative breeders, reproductive skew is extreme and leads to intense intrasexual competition for access to reproduction in both sexes. Given that securing the dominant position is costly, dominant animals should direct their aggressiveness towards same-sex subordinates that are potential competitors. Chemical communication has been reported to be involved in intrasexual competition in several mammalian species, and odour may be used as a cue to identify potential competitors.

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Skip to search form Skip to main content. Seasonal gonadal tissue and blood samples were collected from farmed great sturgeon for three years. The sex and stages of maturity were determined by histology and laparoscopy at the beginning and end of experiment.

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Moghim, M. Iranian Journal of Fisheries Sciences, 2 2pp. Knowledge of both sex and maturity stage without killing fish is important from many aspects.

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The lack of detailed life history LH information e. Typically, LH information is acquired using lethal sampling techniques, which undermines the goal of conservation. This is particularly problematic for many shark species that have low fecundity and slow growth rates.

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