Dataset on body weight, carapace width increment and growth band count of mud crabs, Scylla olivacea

Abstract

The present paper contains two datasets; i) the growth band count (GBC) of mud crab, Scylla olivacea collected from Setiu Wetlands, Terengganu coastal water, East coast of Peninsular Malaysia and ii) the increment sizes of body weight (BW) and carapace width (CW) of immature S. olivace after molting. The datasets presented here were associated with the research articles entitled i) “Study on carapace width growth band counts relationship of orange mud crab, S. olivacea (Herbst, 1796) from Terengganu Coastal Waters, Malaysia” (Hasyima-Ismail et al. 2017) [1] and ii) “Relationship between the carapace width and body weight increments and the confirmation of Stage 1 ovary after the molting of immature orange mud crabs, S. olivacea (Herbst, 1796), in captivity” (Amin-Safwan et al. 2019-2020) [2], and provided here as raw data of Supplementary materials. Raw datasets for GBC in the wild were generated by examination of the thin cross sectioning process of the gastric mill of S. olivacea. The GBC were measured for each individual crab wherein band counts ranged from 1 to 3. The analysis provides evidence that the GBC of the crabs can be determined through both mesocardiac and zygocardiac ossicles. This data is of importance to researchers for estimation of stock assessment and improvement of fisheries management to further improve policy. For the BW-CW increment data, a total of 135 immature crabs were sampled from Setiu Wetlands, Terengganu, Malaysia, and were introduced to limb autotomy technique in order to induced molt. Crabs were reared until successful molting and immediately prior to hardened shell, before final measurement of body weight and carapace width determination. Recorded data was analyzed by calculating the increment sizes, along with correlation and regression analysis between body weight and carapace width of mud crabs.

Effect of Amphipods (Grandierella megnae) Density on the Growth and Survival Rate of Mangrove Crab (Scylla tranquebarica)

“…The growth of carapace weight and width, the growth rate of carapace weight and width of the 30 and 40 ind/0.5 L treatments was higher, this was allegedly because the amount of feed given was able to meet the nutritional needs for crab growth, where the stored energy was greater than the energy used for body activity. Proper feeding both in terms of quantity and quality is an effort to reduce the level of cannibalism and trigger the growth of mangrove crabs [2,17] Growth is the change/addition of weight or body size of crabs kept in units of time [18]. Treatment with an amphipod density of 30 ind/0.5 L was as good as a density of 40 ind/0.5 L. Based on feed efficiency, the treatment with an amphipod density of 30 ind/0.5 L was more efficient than the treatment with a density of 40 ind/0.5 L. According to Craig & Kuhn [19], the feed efficiency will be higher if the amount of feed given is less but the feed can be utilized properly so as to provide maximum growth.…”