Enhancement of Natural Populations of Moi (Polydactylus Sexfilis) in Hawaii Through the Release of Hatchery-reared Juveniles -- a Feasibility Study of Sea Ranching
Enhancement of Natural Populations of Moi (Polydactylus Sexfilis) in Hawaii Through the Release of Hatchery-reared Juveniles -- a Feasibility Study of Sea Ranching
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1977-03
Authors
Rao, Teegavarapu R.
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Hawai'i Institute of Marine Biology (formerly Hawai'i Marine Laboratory)
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Abstract
There has been a drastic decline in recent years in the commercial
catches of moi (Polydactylus sexfilis) in Hawaii. Encouraged by the success
of ranching of non-anadromous fishes in Japan, a study was undertaken to
assess the feasibility of enhancing moi populations in Hawaii through the
release of hatchery-reared juveniles. The life history and fishery of moi,
and the hatchery production of juveniles are discussed from the viewpoint of
possible artificial recruitment. Although the moi hatchery technology
developed at the Hawaii Institute of Marine Biology is promising, larval
survival rates presently achieved are considered too low to support a profitable
juvenile-release program. Information is needed on the movements of
moilii (juvenile moi) in order to determine the return rates of released
juveniles. A general economic evaluation of a "model" moi ranching program.
indicates that a commercially viable moi enhancement program is possible if
the rearing costs were brought down to 5¢ or less per juvenile, and if one
million or more moilii could be released annually. This study recommends
that, as a prerequisite for the eventual establishment of a moi ranching
program in Hawaii, the present hatchery technology for moi should be perfected
to achieve larval survival rates of at least 20% and that a tag-recapture
study on moilii in the inshore waters be initiated to obtain
reliable estimates of their return rates.
Description
46 leaves ; 28 cm.
Keywords
Fish culture--Hawaii.,
Aquaculture--Hawaii.
Citation
Teegavarapu RR. 1977. Enhancement of natural populations of moi (Polydactylus sexfilis) in Hawaii through the release of hatchery-reared juveniles -- a feasibility study of sea ranching. Honolulu (HI): Hawai'i Institute of Marine Biology, University of Hawai’i. Report No.: 33.
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50 pages
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