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Reproductive biology of Thai freshwater pearl mussel Hyriopsis (Limnoscapha) myersiana (Lea, 1856)
Nagachinta, A.; Meejui, O. (1998). Reproductive biology of Thai freshwater pearl mussel Hyriopsis (Limnoscapha) myersiana (Lea, 1856). Spec. Publ. Phuket Mar. Biol. Cent. 18(1): 103-106
In: Phuket Marine Biological Center Special Publication. Phuket Marine Biological Center: Phuket. ISSN 0858-3633, more
Peer reviewed article  

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  • Nagachinta, A.
  • Meejui, O.

Abstract
    The gonadal development of Hyriopsis (Limnoscapha) myersiana an economically important freshwater pearl mussel in Thailand was investigated by monthly histological examination of mussels collected from the natural habitat for 1 year. The gonad development was divided into 6 stages: prefollicular, initial, developing, mature, partially spawned, and spent. The dioecious mussels had a sex ratio of male to 0.91 female. Reproduction was observed from May to October. Formation of marsupia in rearing condition showed the same period of reproduction as in the wild population. On average, marsupia were formed 18.9 times in 1 year. The incubation period of fertilized eggs inside marsupia was 5-9 days. About 11% of a total of 599 fishes carried encysted glochidia. Cysts were found in 18 species, mainly in the family Cyprinidae. The prevalence of infested fishes was highest in Hampala macrolepidota, Mystus nemurus, and Puntius schwanenfeldi respectively. Infestation occurred in gills, especially gill filaments, more than on other parts of the fish body.

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