Sexual differentiation in fish

Developmental Brain Research 73 — Neurobiology of Aging 1 Supplement 1 S1 —S Increases in GABA release also occur in males, but they occur sporadically and are not confined to the morning. Failure of this feedback results in disordered testicular structure, abnormal sperm production and reduced testosterone synthesis. Recent Progress in Hormone Research 28 — Exogenous sex steroids administered at the time of sex determination can strongly influence the course of sex differentiation in fish, suggesting that they play a critical role in assignment of gonad determination as well as subsequent differentiation. Comparison of these mice allows assessment of sex chromosome effects independent of gonadal sex on sexually differentiated structures and functions.
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In search of determinants: gene expression during gonadal sex differentiation.

The proportion of dnd morphants with a normal gonad decreased with increase in dnd -MO dosage, whereas the rate with an atypical gonad increased. Fish Physiol Biochem In the dnd morphants, ribbon-like and tube-like gonads could be discriminated by external appearance. Moreover, for breeding purposes it is important to maintain balanced sex ratios. Research categories covered by JZAR include studies in pure and applied biological sciences e.
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CSIRO PUBLISHING | Australian Journal of Zoology

POD1 is necessary for normal vascularisation of the testis and it is also necessary for gonadal development in both sexes, because the Pod1 knock-out mouse exhibits gonadal hypoplasia. Experimental Fish and Embryos. Annual Review of Neuroscience 25 — Oestradiol can regulate the production of neurotrophs and their activity by altering their receptor levels e. Neonatal oestrogen alters the morphology of astrocytes and in adulthood these astrocytes do not have the plasticity to alter in response to the endocrine milieu. By contrast, the ribbon-like gonads of phenotypically female dnd morphants contained stromal tissue on the ventral side and epithelial cells lining the coelomic wall, similar to the ovaries of wild-type females Fig. Reproductive Toxicology 20 5 —
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In contrast, most vasa -positive cells in dnd morphants were ectopically positioned after the 2- to 4-somite stage and finally could not be detected at 5-dpf larvae Table S3. However, high or low temperatures have limited effect, in addition to there being a window of sex reversal in which temperature acts, varying from species to species. View inline View popup. After 6 months, each group was moved to a liter aquarium for behavioral observation. You already have online access to this title.
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