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dc.contributor.author Moiseeva, Elizabetha B. en_US
dc.contributor.author Sachs, O. en_US
dc.contributor.author Zak, T. en_US
dc.contributor.author Funkenstein, B. en_US
dc.date.accessioned 2012-01-19T20:06:44Z en_US
dc.date.available 2012-01-19T20:06:44Z en_US
dc.date.issued 2001 en_US
dc.identifier.citation Moiseeva, E.B., Sachs, O., Zak, T., & Funkenstein, B. (2001). Protandrous Hermaphroditism In Australian Silver Perch, Bidyanus Bidyanus (Mitchell, 1836). The Israeli Journal of Aquaculture - Bamidgeh, 53(2), 57-68. en_US
dc.identifier.issn 0792-156X en_US
dc.identifier.uri http://hdl.handle.net/10524/19031 en_US
dc.description.abstract Gonadal development in two progenies of the Australian silver perch, Bidyanus bidyanus, was studied from the larval stage to 18.5 months. For approximately one month after hatching, it was impossible to visually or histologically determine the sex of the fish. Two to three months after hatching, anatomical and cytological sex differentiation occurred. At 4-5 months, the testis in most of the fish longer than 7-8 cm exhibited all stages of spermatogenesis including spermatozoa. Very few females were found among the 4 and 6.5 month fish. Up to 18.5 months, 7.1-23.5% were female (except in one batch). There were only 25 females, all at early stages of oogenesis, amongst 204 fish with differentiated sex gonads. In 10 of 17 histologically studied females, there were degenerating male cells (possibly spermatocytes) among a majority of developing oocytes. The predominance of phenotypic males, and the occurrence of females with ovaries and degen- erating male cells, indicate that during the first years of life, this species is a protandrous her- maphrodite. The testis develops during ontogenesis in a direct manner, whereas the female gonad develops indirectly, passing through an intermediate masculine stage. en_US
dc.format.extent 12 pages en_US
dc.publisher Israeli Journal of Aquaculture - BAMIGDEH en_US
dc.relation.ispartofseries The Israeli Journal of Aquaculture - Bamidgeh en_US
dc.subject.lcsh Fish culture--Israel--Periodicals. en_US
dc.subject.lcsh Fish culture--Periodicals. en_US
dc.subject.lcsh Aquaculture--Israel--Periodicals. en_US
dc.subject.lcsh Aquaculture--Periodicals. en_US
dc.title Protandrous Hermaphroditism In Australian Silver Perch, Bidyanus Bidyanus (Mitchell, 1836) en_US

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