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Abundance, Size Structure and Quality of Silver-lip Pearl Oysters in the Solomon Islands Final, June 20083.0 RESULTS3.1 Recent and Ongoing Exploitation of Pearl OystersThe results of the interviews undertaken with island communities are summarised inAppendix 3. The key information obtained from each community about recent and ongoingexploitation and the current distribution of silver-lip oysters is outlined below.3.1.1. Recent and Ongoing ExploitationThe respondents indicated that small amounts of shell are still collected at Marau, MboliPassage, Sandfly Passage and Maramasike (Malaita). These are used locally as jewelleryand/or shell money. They also mentioned that there is a local market for oyster shell atMaramasike (Malaita) and that some of the divers at Kia are collecting silver-lip oysters andstoring them near their houses in the hope that the fishery will be re-opened. Therespondents at Waghina indicated that big harvests of pearl oysters have occasionally beenmade since the ban and the shell sold to illegal exporters.3.1.2 Current DistributionThe Waghina community indicated that plenty of silver-lip oysters are available and that thebest places to find them are throughout Hamilton Channel, in the narrow channel atNgosele and in the channel running from Kia towards Waghina.The respondents from Kia indicated that silver-lip oysters can still be found at shallowdepths and that they occur on a variety of substrata, including mud and broken coral. Theyalso mentioned that oysters can be found in the small channel at Kakadeke at depths of 10-20 m.According to the Marovo (Telina/Mbili) community, silver-lip oysters can be found inalmost every channel between the islands, at depths greater than 20 m and sometimes occurin good numbers. Silver-lip oysters were also reported to occur on stony substrata in MbiliPassage and in nearby 30 m deep channels.At Marau, silver-lip oysters were reported to be widespread and present in lagoons,passages and open water. The shallow Suukitahi Passage, the slopes of the passes betweenthe islands and an area NE of Taiaru Reef were reported to be good fishing sites.The interviewees at Ngella, indicated that shell is taken from the water at the northern endof Mboli Passage and in the area to the east and west of the passage where it spills out intothe open sea. At Mboli Passage itself, shell collecting begins part way up the passage (fromHoniara end) and extends right up to the mangroves. It was reported that no shells occur atthe southern part of Mboli Passage nor where it opens to the sea. At Sandfly Passage, shellis taken in the bays and slopes to north and south, rather than in the centre which is deep.The favoured locations are around Mbike Island and the promontory to the north of this(Hanipana Pt), Roderick Dhu Bay and Haroro Bay. The respondents also mentioned thatshell occurred in Hanesavo Harbour and the passage running NE/SW to the E ofMangalonga Island, to the NW of Sandfly Passage.Three collecting areas were identified on the east and west sides of the northern mouth ofMaramasike Passage.The Ecology Lab Pty Ltd – Marine and Freshwater Studies Page 8
Abundance, Size Structure and Quality of Silver-lip Pearl Oysters in the Solomon Islands Final, June 20083.2 Underwater Visual Census3.2.1 AbundanceSilver-lip pearl oysters were found on 33 of the 96 transects surveyed, yielding a total of 117oysters. Waghina, Kia and Mboli Passage (Narula Passage), had the largest populations,with mean densities of 1.23 ± 0.38, 1.03 ± 0.27 and 0.66 ± 0.27 pearl oysters per 400m 2transect, respectively (Figure 2). Pearl oysters were not found at Mbili Passage and Telina 1and were scarce (i.e. had an average density of
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Stimulating investment in pearlfarm
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Appendix IAppendix IIAppendix IIIAp
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various project elements to describ
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PNGSolomon IsPNGCook IsVanuatuFijiF
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Figure 2. Typical coastal habitat f
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to work alongside WorldFish science
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least two weeks before the main sur
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duration of the dive, maximum botto
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3.7 Natural disastersEnvironmental
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• Legislative review is underway
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− Manning Strait islands− Suava
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incentive treatment that fits the l
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continuing to enter the market. Thi
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Provisions for further aquaculture
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• licences will relate to a parti
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species in Australia are 5 - 10 tim
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6.3 Investor’s recommendations fo
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Report on an EU project grant to th
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Summary• Historically, the blackl
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1. IntroductionBlacklip pearl oyste
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3. Nationwide surveysIn May-June 20
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10 spat collectors were attached at
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On a local scale, it was found that
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3025Normalised catch201510500 2 4 6
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30Spat collector -125201510a. NoroL
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Figure 10. The number of Cymatium,
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Figure 11. Intermediate culture tra
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% survival10090HatcheryWild80706050
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Thus, under the regime developed in
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7.3 Retention and mortality after s
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7.5 Seeding of hatchery-produced sp
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have used average values of $25, $3
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9. ReferencesBraley, R.D. 1997. Fin
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depend mainly on the quality of the
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Report to:World Fish CenterSuitabil
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Suitability of Habitats for Growth
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Report to:World Fish CenterWater Te
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Water Temperature and Cyclone Frequ
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existing links, at locations within
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6. Forms of co-investment6.1 Partne
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8. Taxation and incentives8.1 Direc
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10. Labour laws10.1 Foreign workers
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GILLETT, PRESTON AND ASSOCIATES INC
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Page 21. EXECUTIVE SUMMARYPearl far
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Page 42. BACKGROUNDPast research su
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Page 6million; in 2002, it exported
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Page 8the bead in an even, uniform
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Page 10alternative products. Most m
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Page 12fisheries-related activities
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Page 144.3. PolicyThe current gover
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5.2. Stocking densityPage 16Mature
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Page 18or harmful fouling organisms
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Page 20In addition to licensing und
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Page 22Much of this work will have
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Page 24provide them with technical
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Page 26management, disease control,
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Page 28Ministry of Development Plan
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Page 30‘seeding’ means the impl
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Page 326. Provision of statistical
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Page 3414. Aggrieved person may app
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Page 36Division V. Importation, mov
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Page 38(2) Separate fees are payabl
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Page 40Other forms of government su
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Page 42Solomon IslandsPEARL FARMING
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