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dc.contributor.authorMarte, Clarissa L.
dc.contributor.authorLam, T. J.
dc.date.accessioned2013-02-04T05:33:11Z
dc.date.available2013-02-04T05:33:11Z
dc.date.issued1992
dc.identifier.citationMarte, C. L., & Lam, T. J. (1992). Hormonal changes accompanying sexual maturation in captive milkfish (Chanos chanos Forsskal). Fish Physiology and Biochemistry, 10(4), 267–275.en
dc.identifier.issn0920-1742
dc.identifier.urihttp://hdl.handle.net/10862/1388
dc.description.abstractSteroid hormone profiles accompanying sexual maturation in captive milkfish are described. There were no significant differences in levels of serum estradiol 17-β (E<sub>2</sub>) and testosterone (T) between immature male and female fish. Mean E<sub>2</sub> levels rose from 0.54±0.11 ng/ml in immature females (Stage 1) to 4.53±1.16 ng/ml in vitellogenic females (Stage 5), while T levels increased from 2.06±0.28 ng/ml to 38.4±9.26 ng/ml. E2 and T levels were positively correlated to GSI and oocyte diameter. In males, serum T levels increased from 2.5±0.40 ng/ml in immature males to 27.73±5.02 ng/ml in spermiating males. A significantly higher T level was found in males with thick and scantly milt (spermiation index, SPI, 2) compared to males with scanty milt (SPI, 1) or males with copious, fluid milt (SPI, 3). Serum levels of E<sub>2</sub> and T, and the GSI in females rose significantly during the breeding season (April–June 1983). The levels of both steroids dropped below 1 ng/ml in spent females sampled in succeeding months. In immature males, T levels ranged from 1.11 ng/ml to 2.78 ng/ml and rose significantly to 21.52±8.38 ng/ml during the breeding season when GSI peaked. Serum T levels dropped to around 10 ng/ml in the succeeding months when only spent or regressed males were sampled.en
dc.language.isoenen
dc.publisherSpringer Verlagen
dc.subjectMilkfishen
dc.subjectTestosteroneen
dc.subjectChanos chanos
dc.titleHormonal changes accompanying sexual maturation in captive milkfish (Chanos chanos Forsskal)en
dc.typeArticleen
dc.citation.volume10
dc.citation.issue4
dc.citation.spage267
dc.citation.epage275
dc.citation.journalTitleFish Physiology and Biochemistryen
dc.subject.asfaFish cultureen
dc.subject.asfaHormonesen
dc.subject.asfaReproductive cycleen
dc.subject.asfaSeasonal variationsen
dc.subject.asfaSeasonalityen
dc.subject.asfaSexual maturityen
dc.subject.asfaSexual reproductionen
dc.identifier.doi10.1007/BF00004475


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    These papers were contributed by AQD staff to various national and international journals

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