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May 5, 2024
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Abstract

Interspecific hybridization of mud crab Scylla spp has been successfully conducted in controlled tanks. However, there is no information yet available about the male size S. tranquebarica is capable to copulate with female of S. olivacea. The objectives of the experiment is to find out the male size of S. tranquebarica that willingly copulated with newly molted female of S. olivacea. Twelve
individual of adolescent female of S. olivacea were reared individually in the conical fibreglass tanks each of 500 L volume. In another tank, 12 adult male S. tranquebarica with various size (200-500g/ind.) were also prepared. The crabs fed with chopped trash fish in the morning (7.00 am) and afternoon (17.00 pm) at 5% of the total crab biomass. Each newly molted female is transfered to the prepared copulation tank where three male of different size have been placed and allow them to mate and freely copulated with the female. The size
of copulated crabs (body weight, carapace with, and carapace length) were recorded. The female sizes were measured before and after molting, whereas, the male sizes were measured soon after mating process has finished. Post mating, the female crab then reared individually in the recirculating tank system until mature and spawned. The result showed that male S. tranquebarica with individual weight of >300g are preferable to copulate with female S. olivacea, where in contrary no male crab of the size <300g were successfully mate. The duration from mating to gonad maturity stage IV for the hybridized S. olivacea in this study ranges between 59-103 days.

Keywords

Scylla olivacea, Scylla tranquebarica, preferences, mating, mature gonade

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Copyright (c) 2019 Aquacultura Indonesiana

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Author Biographies

Gunarto Gunarto, South Sulawesi, Indonesia.

Research Institute for Coastal Aquaculture and Fisheries Extension

Sulaeman Sulaeman, South Sulawesi, Indonesia.

Research Institute for Coastal Aquaculture and Fisheries Extension

Herlinah Herlinah, South Sulawesi, Indonesia.

Research Institute for Coastal Aquaculture and Fisheries Extension

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