Research articles
ScienceAsia 50 (2024):ID 2024103 1-8 |doi:
10.2306/scienceasia1513-1874.2024.103
Color characteristics and histology of the ovarian
development in the sesarmid crab, Episesarma versicolor
(Tweedie, 1940) from Thailand
Chanyut Sudtongkonga, Sinlapachai Senaratb, Porntep Wirachwonga, Supparat Kong-oha,*
ABSTRACT: The female reproductive histology of crabs has been widely observed but not for the sesarmid crab,
Episesarma versicolor (Tweedie, 1940), an economically important crab in Thailand. This study determined how oocyte
development related to the gonadosomatic index (GSI). The ovaries of the collected specimens were morphologically
and histologically examined. The germination of the ovary commenced at the center of the ovarian tissue, consisting
of oogonia proliferation as the primary growth phase, referred to as the previtellogenic stage (OcI). The secondary
growth phase was divided into the early vitellogenic stage (OcII) and the late vitellogenic stage (OcIII) with the mature
stage (OcIV) formed within the germinal zone. Four distinct stages of ovary development were identified. Stage I
ovary (immature stage; GSI = 0.32?0.13, n = 69) appeared as the smallest organ with a translucent color and most
oogonia proliferation in the primary growth phases. Stage II ovary (developing stage; GSI = 0.70?0.10, n = 52) was
characterized by the appearance of a creamy white color and mainly contained OcII oocytes. In Stage III (developed
stage; GSI = 1.23?0.37, n = 46), a bright orange ovary developed with the proliferation of OcIII/OcIV oocytes, while
Stage IV ovary (mature stage; GSI = 2.63?0.43, n = 49) presented as a deep yellow to red-brown/orange color and
dominantly consisted of OcIV. The information obtained is beneficial for successful broodstock development as the
initial step toward realizing large-scale production of this species.
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| a |
Department of Marine Science and Environment, Faculty of Science and Fisheries Technology, Rajamangala
University of Technology Srivijaya, Trang 92150 Thailand |
| b |
Division of Biological Science, Faculty of Science, Prince of Songkla University, Songkhla 90110 Thailand |
* Corresponding author, E-mail: Supparat.Kongoh@gmail.com
Received 29 Apr 2024, Accepted 10 Aug 2024
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