Effect of substrate‑shelter and substrate‑shelter orientation on survival and growth of the megalopa and first crab instar Scylla tranquebarica

Thien, Fui Yin and Noorsyarinah Sanudin and Katsuyuki Hamasaki and Rossita Shapawi and Audrey Daning Tuzan and Zarinah Waheed and Yong, Annita Seok Kian (2025) Effect of substrate‑shelter and substrate‑shelter orientation on survival and growth of the megalopa and first crab instar Scylla tranquebarica. Fisheries Science. ISSN 0919-9268

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Abstract

The present study aimed to investigate the effect of the substrate-shelter and substrate-shelter orientation on the survival and growth of the megalopa and first crab instar of Scylla tranquebarica. The substrate-shelter and substrate-shelter orientation experiments were conducted with or without sand substrate, in combination with a net and polyvinyl chloride pipe (PVC) as shelters, in triplicate groups for 14 days. In the orientation experiment, shelters were positioned either horizontally or vertically in the culture tank. Megalopae had metamorphosed into first and second crab instars on day 14. Both experiments exhibited a similar trend in observations: the second crab instar composition percentage (CP), total survival rate (SR), and total yield (TY) were significantly higher in the substrate group than the non-substrate group (P < 0.05); and the net shelter outperformed the PVC shelter, as indicated by the higher CP, SR, and TY. In the same shelter group, the horizontal shelter was more efficient than the vertical one, as shown by greater CP, SR, and TY. A substrate in combination with a horizontal net shelter is thus recommended for rearing purple mud crab megalopa and crab instar. This feasible rearing technique pro-motes consistent crab seed production in the hatchery to support sustainable mud crab aquaculture.

Item Type:	Article
Keyword:	Megalopa-instar, Substrate, Shelter, Shelter orientation, Survival, Growth
Subjects:	S Agriculture > SH Aquaculture. Fisheries. Angling > SH1-691 Aquaculture. Fisheries. Angling > SH201-399 Fisheries > SH365-380.92 Shellfish fisheries. Shellfish culture
Department:	INSTITUTE > Borneo Marine Research Institute
Depositing User:	DG MASNIAH AHMAD -
Date Deposited:	13 Oct 2025 15:48
Last Modified:	13 Oct 2025 15:48
URI:	https://eprints.ums.edu.my/id/eprint/45420

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