Histological observation on gonad development of the freshwater pearl mussel,Hyriopsis(Limnoscapha)myersiana
| Autor: | Kannika Chatchavalvanich, Uthaiwan Kovitvadhi, Satit Kovitvadhi, Amara Thongpan, Nopparat Srakaew |
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| Rok vydání: | 2010 |
| Předmět: |
endocrine system
medicine.medical_specialty Gonad biology urogenital system Histology biology.organism_classification Sperm Andrology medicine.anatomical_structure Endocrinology Freshwater pearl mussel Internal medicine medicine Animal Science and Zoology Vitellogenesis Development of the gonads Spermatogenesis Germ cell Developmental Biology |
| Zdroj: | Invertebrate Reproduction & Development. 54:203-211 |
| ISSN: | 2157-0272 0792-4259 |
| DOI: | 10.1080/07924259.2010.9652334 |
| Popis: | The microscopic structure of the gonad at different ages of the cultured mussel Hyriopsis (Limnoscapha) myersiana is described. Male gonadal acini are first observed at 6 months old; they are small and scarce, and contain only a few germ cells at the early stage of spermatogenesis. At 7 and 8 months old, the male acini increase in size and have more numerous germ cells at subsequent developmental stages: i.e., spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids and spermatozoa. Male germ cell morulae are also found in the acini. At 9 months old, the male gonad becomes fully developed and occupies two-thirds of the visceral mass. Sperm are found abundantly in the acini and gonoducts, indicating spawning. The female gonad begins to develop at 8 months old with a few small previtellogenic oocytes and numerous nutritive granules in the acini. The female gonad and gonoduct are well developed at 9 months old. Several large vitellogenic oocytes are found in the acini; the cytoplasm... |
| Databáze: | OpenAIRE |
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