Artificial Intelligence | 2019
The Preference Size Of Male Mud Crab, Scylla tranquebarica at Success Mating With Female , Scylla olivacea in Controlled Tanks
Abstract
Interspecific hybridization of mud crab Scylla spp has been successfully conducted in controlled tanks. However, there\xa0 is no information yet available about the male size\xa0 S. tranquebarica is capable to copulate with female of S. olivacea . The objectives of the experiment\xa0 is to find out\xa0 the\xa0 male size of\xa0\xa0 S. tranquebarica that willingly copulated with newly molted female of\xa0 S. olivacea .\xa0 Twelve\xa0 individual of adolescent female of S. olivacea were reared individually in the conical fibreglass tanks each of\xa0 400 L volume. In\xa0 another tank,\xa0 12 adult male\xa0 S. tranquebarica with various size (200-400g/ind.) were also prepared. The crabs fed with chopped trash fish\xa0 in the morning (7.00 am) and afternoon (17.00 pm) at 5% of the total crab biomass. Each newly molted female is\xa0 transfered to the copulation tank and three male of different size also stocked at the copulation tank, then wait until one of the three male do copulation with female new molt.\xa0 The size of copulated crabs (body weight, carapace with, and carapace length) were recorded.\xa0 The female crabs sizes were measured\xa0 before and after molting, whereas, the\xa0 male crab sizes were measured soon after mating process has finished.\xa0 Post mating, the female crab then reared individually in the tank until\xa0 spawned. The result\xa0 showed that male S.tranquebarica\xa0 of >300g individual weight are preferable to copulate with female S. olivacea, and contrary none of male crab with size <300g do succsess mating \xa0The time period from mating until\xa0 gonad maturity stage IV for the S. olivacea in this study range between 59-103 days.