Preliminary Aquaculture Evaluation of Moi (Polydactylus sexfilis)

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Abstract
Evaluation of feed materials, culture environments, and tolerance of salinity and dissolved oxygen confirmed that the moi, a polynemid (threadfin), is amenable to further aquaculture development. Wild-caught juvenile moi grew faster on a diet of cut fish and squid than on prepared commercial feed, and they grew faster in a 23-m3 net-pen than in 0.7-m3 cylindrical tanks. Juveniles survived dilution of culture water from 34‰ salinity seawater to 1‰ in 1 h, and showed no ill effects from being held at 5–15‰ for 40 d. They survived depletion of dissolved oxygen to levels below 4 mg/L, but showed progressive symptoms of hypoxic stress indicating lethal levels near 3 mg/L. Moi are protandrous hermaphrodites; fish matured spontaneously as males at fork lengths greater than 20 cm (in both net-pens and tanks) 6–7 months after capture at 6 cm. Growth rates indicated the potential for maturation as females within a year in captivity.

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