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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dc.contributor.author Rao, Teegavarapu R.
dc.date.accessioned 2010-09-25T23:18:03Z
dc.date.available 2010-09-25T23:18:03Z
dc.date.issued 1977-03
dc.description 46 leaves ; 28 cm.
dc.description.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.
dc.format.extent 50 pages
dc.identifier.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.
dc.identifier.uri http://hdl.handle.net/10125/18036
dc.language.iso en-US
dc.publisher Hawai'i Institute of Marine Biology (formerly Hawai'i Marine Laboratory)
dc.relation.ispartofseries HIMB Technical Reports
dc.relation.ispartofseries No. 33
dc.subject.lcsh Fish culture--Hawaii.
dc.subject.lcsh Aquaculture--Hawaii.
dc.title Enhancement of Natural Populations of Moi (Polydactylus Sexfilis) in Hawaii Through the Release of Hatchery-reared Juveniles -- a Feasibility Study of Sea Ranching
dc.type Report
dc.type.dcmi Text
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