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Gonadal development and sex inversion in saddleback anemonefish Amphiprion polymnus Linnaeus (1758)

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dc.contributor.author Kannika Chatchavalvanich
dc.contributor.author Pisut Mungkornkarn
dc.contributor.author Institute of Marine Science
dc.contributor.author Sukjai Rattanayuvakorn
dc.contributor.other Institute of Marine Science
dc.date.accessioned 2019-03-25T09:14:47Z
dc.date.available 2019-03-25T09:14:47Z
dc.date.issued 2006
dc.identifier.uri http://dspace.lib.buu.ac.th/xmlui/handle/1234567890/2371
dc.description.abstract Gonadal development and sex inversion of saddleback anemonefish, Amphiprion polymnus were described. One-month juveniles had sexually undifferentiated gonads with primordial germ cells aggregated in groups, while two- to three-month juveniles displayed immature hermaphroditic gonads containing early developmental stages of both male and female germ cells, namely spermatogonia, primary spermatocytes, oogonia, and primary oocytes in chromatin-nucleolus stage. Spermatogenesis began at 4 months having testicular tissue comprising of spermatogenic cells in all developmental stages but ovarian cavity was first seen later at 5 months. The male region of ovotestis was peripheral, whereas the female region was more centrally located. There was no connective tissue between ovarian and testicular areas. Six-to 11-month fish had slightly larger ovotestes than those at previous age. Protandric sex inversion first occurred at 12 months. Sex change was characterized by degeneration of male germ cells, deposition of yellow-brown pigment and the formation of vitellogenic oocytes. Before spawning activity began, their gonads contained female germ cells in all stages with numerous vitellogenic oocytes, whereas functional males had both ovarian and testicular tissues. Most females of breeding pairs had mature oocytes in their gonads and began to spawn when their ages reached 14 months. en
dc.language.iso eng th_TH
dc.subject gonadal development th_TH
dc.subject saddleback anemonefish th_TH
dc.subject sex inversion th_TH
dc.title Gonadal development and sex inversion in saddleback anemonefish Amphiprion polymnus Linnaeus (1758) en
dc.type บทความวารสาร th_TH
dc.issue 1
dc.volume 40
dc.year 2006
dc.journal Kasetsart Journal - Natural Science
dc.page 196-203.

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