12 Pages
English

Effects of the bloom forming alga Trichodesmium erythraeum on the pearl oyster Pinctada maxima

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Niveau: Supérieur, Doctorat, Bac+8
oysters occurred but individuals exposed to T. erythraeum at 105 cells/ml were less healthy than those fed upon the diatom Chaetoceros calcitrans. Histopathology of adult oysters from the affected farm and juvenile oysters exposed to T. erythraeum in the aquarium experiments were similar and included dilation of digestive gland lumens, sloughing of epithelial cells and granulocytes under the epithelial layer. These symptoms suggest that the T. erythraeum blooms in the archipelago were not a suitable food source for the oysters and may have contributed to the observed mortalities. D 2004 Elsevier B.V. All rights reserved. Keywords: Trichodesmium; Pearl; Oyster; Toxin; Pinctada maxima; Saxitoxin 1. Introduction Effects of the bloom-forming alga Trichodesmium erythraeum on the pearl oyster Pinctada maxima Andrew P. Negria,*, Owen Bunterb, Brian Jonesc, Lyndon Llewellyna aAustralian Institute of Marine Science, PMB 3, Townsville MC 4810, Australia bPearl Solutions P/L, 25 Fagan Street, Yokine WA 6060, Australia cDepartment of Fisheries, c/o Animal Health Laboratories 3 Baron-Hay Court, South Perth 6151, Australia Received 14 April 2003; received in revised form 1 July 2003; accepted 1 July 2003 Abstract Farmed pearl oysters (Pinctada maxima) suffered high mortality in the Dampier Archipelago of Western Australia in 1996. The mortality event affected all oyster sizes and coincided with extensive blooms of the cyanobacterium Trichodesmium erythraeum.

  • pearl hatchery

  • pearl oysters

  • feeding experiment

  • sloughing feeding response

  • large mortality

  • trichodesmium sp

  • mortality event

  • collected daily


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Language English
Aquaculture232(2004)91–102www.elsevier.com/locate/aqua-onlineEffectsofthebloom-formingalgaTrichodesmiumerythraeumonthepearloysterPinctadamaximaacb,aAndrewP.Negri*,OwenBunter,BrianJones,LyndonLlewellynaAustralianInstituteofMarineScience,PMB3,TownsvilleMC4810,AustraliabPearlSolutionsP/L,25FaganStreet,YokineWA6060,AustraliacDepartmentofFisheries,c/oAnimalHealthLaboratories3Baron-HayCourt,SouthPerth6151,AustraliaReceived14April2003;receivedinrevisedform1July2003;accepted1July2003AbstractFarmedpearloysters(Pinctadamaxima)sufferedhighmortalityintheDampierArchipelagoofWesternAustraliain1996.ThemortalityeventaffectedalloystersizesandcoincidedwithextensivebloomsofthecyanobacteriumTrichodesmiumerythraeum.ThepotentneurotoxinsaxitoxinwasdetectedinsmallamountsinsomeoftheaffectedadultoystersbutwasnotdetectableinT.erythraeum.Vibriospecieswereisolatedfromsomeoftheaffectedoystersbutnotinpatternsconsistentwithaprimarydiseaseandnovirus-likeparticleswereobserved.JuvenileoysterswereexposedtomediumandhighconcentrationsofT.erythraeuminexperimentalaquariafor7days.NomortalityofjuvenileoystersoccurredbutindividualsexposedtoT.erythraeumat105cells/mlwerelesshealthythanthosefeduponthediatomChaetoceroscalcitrans.HistopathologyofadultoystersfromtheaffectedfarmandjuvenileoystersexposedtoT.erythraeumintheaquariumexperimentsweresimilarandincludeddilationofdigestiveglandlumens,sloughingofepithelialcellsandgranulocytesundertheepitheliallayer.ThesesymptomssuggestthattheT.erythraeumbloomsinthearchipelagowerenotasuitablefoodsourcefortheoystersandmayhavecontributedtotheobservedmortalities.D2004ElsevierB.V.Allrightsreserved.Keywords:Trichodesmium;Pearl;Oyster;Toxin;Pinctadamaxima;Saxitoxin1.IntroductionThepearlingindustry,basedonPinctadamaximaJameson,hasbeenactiveofftheWesternAustraliancoastlinesince1861(Edwards,1994).Today’sindustryisvaluedatover$100millionUSandusesbothwild-caughtandhatchery-rearedanimalsforthe*Correspondingauthor.Tel.:+61-7-47243802;fax:+61-7-4772-5852.E-mailaddress:a.negri@aims.gov.au(A.P.Negri).0044-8486/$-seefrontmatterD2004ElsevierB.V.Allrightsreserved.doi:10.1016/S0044-8486(03)00487-3