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dc.contributor.authorTan-Fermin, Josefa D.
dc.contributor.authorMiura, Takeshi
dc.contributor.authorUeda, Hiroshi
dc.contributor.authorAdachi, Shinji
dc.contributor.authorYamauchi, Kohei
dc.date.accessioned2013-04-24T03:13:15Z
dc.date.available2013-04-24T03:13:15Z
dc.date.issued1997
dc.identifier.citationTan-Fermin, J. D., Miura, T., Ueda, H., Adachi, S., & Yamauchi, K. (1997). Testicular histology and serum steroid hormone profiles in hatchery-bred catfish Clarias macrocephalus (Gunther) during an annual reproductive cycle. Fisheries Science, 63(5), 681–686.en
dc.identifier.issn0919-9268
dc.identifier.urihttp://hdl.handle.net/10862/1605
dc.description.abstractTesticular development, gonadosomatic index (GSI), and related steroid hormones (testosterone or T, 11-ketotestosterone or 11-KT, 17α, 20β-dihydroxy-4-pregnen-3-one or DHP) in serum were monitored during an annual reproductive cycle in tank-reared, hatchery-bred male catfish Clarias macrocephalus to established the season optimum for its artificial propagation. GSI values were highest in June (0.80%), and lowest in December, February, April (0.36%). At most times of the year, lobules in the testis and seminal vesicles were mostly lined with spermatogonia B (SGb) and spermatocytes (SC) and few spermatogonia A (SGa); spermatids (SD) and spermatozoa (SZ) were the least and most abundant of the spermatogenic cells, respectively. In January however, almost equal counts of SGa, SGb and SC were observed, as well as a significant increase in the percentage of SD and corresponding decrease in SZ. Serum 11-KT fluctuated at high levels, with the lowest level in January (159.42 ng/ml), and peak in September (434.72 ng / ml). Serum T levels ranged from 15-25 ng/ml, and were not markedly different throughout the annual cycle. Serum DHP levels were extremely low in January-May, and reached maximum levels in July (0.18 ng/ ml). Seasonal changes in the percentage of spermatogenic cells, GSI and serum steroid hormone profiles showed that captive, hatchery-bred male C. macrocephalus have a continuous reproductive cycle. Although milt release was not observed, males can readily be used as source of milt for artificial propagation at any time of the annual cycle, except in January.en
dc.language.isoenen
dc.publisherJapanese Society of Fisheries Scienceen
dc.subjectClarias macrocephalus
dc.subjectSteroid hormonesen
dc.subjectCatfishen
dc.titleTesticular histology and serum steroid hormone profiles in hatchery-bred catfish Clarias macrocephalus (Gunther) during an annual reproductive cycleen
dc.typeArticleen
dc.citation.volume63
dc.citation.issue5
dc.citation.spage681
dc.citation.epage686
dc.citation.journalTitleFisheries Scienceen
seafdecaqd.library.callnumberVF SJ 0555
seafdecaqd.databank.controlnumber1997-23
dc.subject.asfaHaematologyen
dc.subject.asfaHistologyen
dc.subject.asfaHormonesen
dc.subject.asfaReproductive cycleen
dc.subject.asfaSeasonal variationsen
dc.subject.asfaTestesen
dc.subject.asfaSeasonalityen
dc.subject.asfaReproductionen


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