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    Fisheries Research 125126 (2012) 190197ContentslistsavailableatSciVerseScienceDirect

    FisheriesResearchjournal homepage:www.elsevier.com/locate/fishres

    ThereproductivecycleofOctopuscyaneainsouthwestMadagascarandimplicationsforfisheriesmanagementD.Raberinarya,b,1,S.Benbowa,aBlueVentures Conservation, Level 2Annex, Omnibus Business Centre, 39-41North Road, LondonN7 9DP, UKbInstitut Halieutique et des Sciences Marines,Avenue de France, Mahavatse I, Toliara 601, Madagascara r t i c l e i n f o a b s t r a c tArticle history: TheOctopuscyaneafisheryisthemosteconomicallyimportantfisheryinsouthwestMadagascar.Grow-Received 25August 2011 ingconcernsoverthesustainability ofexploitation havepromotedanumberofconservation effortstoReceived in revised form 21 February 2012Accepted 22 February 2012 improvemanagement ofthefishery.Weanalyseoneyearofcatchdatatoidentifyseasonalvariations

    insexualmaturityandkeyreproductive periodsofthespecies, usingmicroscopic analysisofgonadtis-Keywords:Octopus cyaneaFisheries managementReproductive cycleRecruitment

    suestovalidatefieldassessmentsofmaturity.Datashowseasonalvariability inmaturityandsizeatfirstmaturityforbothsexes,aswellastemporalchangesinthesexratioofthespecies.Maturityoccurredataminimummeanweightof2246gforfemalesand643gformales.Aclearrelationshipbetweengonadweightandtotalweightinmaleoctopusindicatesthattotalweightcanbeusedasaproxyforsexualmaturityinmales.Conversely,femalesshowhighvariability inweightatfirstmaturityandno

    Depth-refuge clearrelationship betweentotalweightandmaturitystage.Fullysexually maturefemaleswereverySouthwest Madagascar rare,constituting lessthan1%ofthetotalsample.Wehypothesise thattheartisanalfisherymaynotbe

    currentlyexploitingmaturefemaleindividualsbecausefemalesretreattodeeperwaterspriortorepro-duction,thusremainingbeyondthereachofthefishery.AnabundanceofjuvenileindividualsinthecatchfromJune,andagainfromOctobertoNovember,indicatesrecruitmentpeaksatthesetwotimes.Inrecentyears,managementofthisspeciesinsouthwestMadagascarhasfocusedonshort-termclosurestofishingwithinspecifictidalreefflatareas.Identificationofthekeyphasesofthereproductive cycleofO.cyaneainsouthwestMadagascar mayprovidemanagerswithbiologicalevidencetosupportseasonalclosuresdesignedtoprotectkeylifestagesofthespecies.

    2012ElsevierB.V.Allrightsreserved.1. Introduction Exploitation ofoctopusstockshasincreasedrapidlysince2003

    asaresultofexpandingcommercialisationofMadagascarsocto-The reef octopus Octopus cyanea is thought to be the most pusfishery,responsible for6070%ofthevalueofmarineresources

    commonoctopusspeciesonreefsworldwideandisthedominant purchasedbycollection andexportcompaniesinsouthwestMada-octopusinmanycoralreefhabitatsintheIndianOceanregion(Van gascar(LHaridon,2006).Inrecentyearslocalcommunities haveHeukelem,1983;RoperandHochberg,1988).Howeverdespiteits expressedconcernsabouttheover-exploitation ofoctopusstocksabundance,researchintothebiologyofthespecieshasbeenlimited andassociateddirectreefdamage,bothofwhichthreaten thetra-toafewkeystudies(GuardandMgaya,2002;VanHeukelem,1973, ditionallivelihoods ofthelocalVezocommunitiesthatinhabitthe1983;Caverivire,2006).Thespeciesisofconsiderablecommercial southwestcoastofMadagascar(Langley,2006;Epps,2007;Astuti,valuetoartisanalfisheriesincoastalEastAfricaandWesternIndian 1995).Fishingpressureisdepth-limited bythenatureoftheglean-Oceanislandstates,wherecatchesaregenerallysoldthrougha ingandspearfishingtechniques andoctopusaregenerally onlynetworkofcollectorstoreachnationalandinternationalexport exploitedonreefflatsinshallowintertidal andsubtidalzones.markets(LHaridon,2006),andtherearefewalternativestomarine Effectively managing the fishery requires a thorough under-resourceextraction,asthearidclimatepreventsanyformoflarge- standingofO.cyaneareproductivebiologysothatmanagementscaleagriculture. measurescanbetargetedatkeyperiodsinthelifecycletoenhance

    effectiveness.Inparticular,temporaryclosuresofindividualfishingsiteshavebeentrialledinsouthwestMadagascarsince2004andaretimedtocoincidewiththeoreticalrecruitmentandspawning

    Corresponding author. Tel.: +261 34 29 100 18.E-mail addresses: [email protected] (D.Raberinary),

    [email protected] (S. Benbow).1Tel.: +44 020 7359 1287.

    peaks.Todate,thetimingsoftheseclosureshavelargelybeenbasedonanecdotalreportsfromfishersandscientifictheories.Quan-titativedatatosupportthetimingoftheseclosures willgreatlycontributetocontinued managementofthefishery.

    0165-7836/$ see front matter 2012 Elsevier B.V.All rights reserved.doi:10.1016/j.fishres.2012.02.025

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    D.Raberinary, S. Benbow/ Fisheries Research 125126 (2012) 190197 191O.cyaneaaredioeceousandfemaleslaybetween150,000and

    700,000eggsinasingleclutch(Caverivire,2006;VanHeukelem,1973).Maturefemaleindividualsoftenmigratefromshallowreefflats into deeper subtidal areas for spawning (Oosthuizen andSmale,2003;SmaleandBuchan,1981;Whitakeretal.,1991).Uponhatching,planktoniclarvaemoveintothewatercolumnforonetotwomonths,anddispersalisthoughttobewiderangingwithlar-vaetravellinguptoseveralhundredkilometresinoceancurrents(Murphyetal.,2002;Casuetal.,2002).Thusitislikelythatspawn-ingfemalescontributetothemaintenanceandreplenishmentofstocksataregionallevel,notsimplyinthevicinityofthespawn-inglocality.Priorstudiesofthereproductive cycleofO.cyaneaintheIndianOceanarelimited.ReproductionofO.cyaneahasbeendocumentedtooccurthroughouttheyearinbothTanzaniaandMadagascarwithreproductivepeaksinJuneandDecember(GuardandMgaya,2002;Caverivire,2006)suggestingthisspeciesutilisesan intermittent spawning strategy occurring over an extendedperiodoftimeasdescribedbyRochaetal.(2001).

    Thisstudypresentsdatafrom12monthsofmonitoringpat-ternsofsexualmaturityandrecruitmentofO.cyaneafromfisherylandingsinsouthwestMadagascartoprovideinsightintotherepro-ductivepatternsofthespeciesinthisregion,withaviewtoadvisingmanagers on recommending timings for temporary fishery clo-sures.2. Materialsandmethods2.1. Studyarea

    ThestudyareaislocatedintheMozambique Channelonthesouthwest coastofMadagascar,approximately 200km north oftheregionalcityofToliara(Fig.1).Octopuscatchdataoriginatesfrom fishers in villages along approximate 30km of coastlinefromAmpasilava in the south toAndragnombala in the north(Fig.1).Withinthisregion,octopusfisherspredominantlytargetthereefflatalongthenearshorefringingreefs,theshallowlagoonalreefflatsandtheoffshorebarrierreefs.Fishersselltheircatchesto one of a number of buyers representing seafood collectioncompanies.2.2. Samplingmethods

    SamplingwasconductedfromFebruary2005toFebruary2006inthevillageofAndavadoaka.Datawerecollectedeverydaythatoctopuseswerelandedinthevillage,andfisherssurveyedwereselectedthroughhaphazard,conveniencesamplingbycommunitydatacollectorswhentheyarrivedatthelandingcollectionpoint.Itwasnotpossibletosamplealloctopusescaughtbyallfishers.Within2hoflandingthefollowinginformationwasrecordedforeachsampledoctopus:octopusweight(includinggonads),weightandlengthofextractedgonads,octopussex,andin-fieldvisualassessmentofgonadmaturity.Forarandomlyselectedsubsetofindividuals,totaloctopuslengthanddorsalmantlelengthwererecordedforonedayperspringtide.

    Octopusweightwasmeasuredusingaspringbalancegradu-atedin50gintervalstoamaximumof4kg,andgonadweightwasmeasuredusinganelectronicscaleaccurateto1g.Sexwasdeter-minedbyidentificationoftheheterocotylusandspermatophoricgrooveonthethirdrightarmofmales(Mangold,1983b).Gonadlength,totaloctopuslengthanddorsalmantlelengthweremea-suredusinga1mmgraduatedtapemeasure.Gonadmaturitywasassessedthroughobservationofthemaximumsizeandcolourofthegonadsforbothsexes,thepresenceofawhiteborderatthebeginningoftheoviductglandsinfemales,andtheappearanceofspermatophores inmales(Table1).Gonadswereextractedprior

    Fig. 1. Regional map and local area map showing study location, villages and reefareas.torecordingofmeasurementsandfishers,whosellindividuals perunitwetweightofcatch,weregivenasmallfeetocompensateforthereductionintotalweight.

    For the randomly selected subset, gonad samples were pre-paredforsecondarylaboratoryassessmentusingBouinsolution,andtreatedwith70%alcoholsolution toremoveresidualstain.Sampleswereviewedusingamicroscopeat100magnification,todeterminenumber,arrangementanddiameterofspermatophores formales,andthemaximumdiameterandlengthofoocytesforTable 1Maturity indices formale and femaleOctopus cyanea.

    Maturity stage IdentificationGonadmass Gonad appearance

    MalesI Immature

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    192 D.Raberinary, S. Benbow/ Fisheries Research 125126 (2012) 190197

    Fig.2. Monthly gonosomatic index for field sampled O. cyanea. Error bars represent standard error around the monthlymean.females,usinganocularmicrometre.Thesemeasurementswere 100gisgenerallyconsidered tobenewlyrecruited(VanHeukelem,usedtodeterminegonadmaturitystagebasedonthecharacteris- 1983),butindividuals thissmallwererarelycapturedusingtheticsdescribedinTable1. fishingtechniques employedinthisregion.Thereforeforthepur-

    NodatawereavailableforJanuary2006duetotheregionalclo- posesofthisanalysisoctopuscaughtweighinglessthan200gweresureoftheoctopusfisheryfrom15thDecemberto1stFebruary, consideredtobenewlyrecruited,sincethesizedifferencebetweenthustheresultsfromFebruary2006maynotreflecttheexpected 100and200gisrepresentedbyapproximately 2weeksofgrowthseasonalfluctuations inoctopusiffishingpressurehadbeenmain- (Caverivire,2006).Thus,theproportion ofthemonthlycatchthattainedduringthatperiod.DataforFebruary2005wereremoved wassmallerthan200gwasconsidered aproxyforoctopusrecruit-fortheseanalyses,becausealowsamplesizereducedthestatistical menttothereef.powerofthesedata. Inordertoassessthesexualmaturityofindividuals inrelationto

    Datawerecollectedfromatotalof3253octopuses(1578female, gonaddevelopment,gonosomatic index(GSI)wascalculated using1675male)overthestudyperiod,gatheredfromcatchesderived theformulaGSI=Mo/(MtMo)100,whereMoistheweightoffrom738fishersand28fishingsites.Totaloctopusanddorsalman- theovaryandMtisthetotalwetweightoftheindividual(Guardtlelengthweremeasuredforasub-sample of812(532male,280 andMgaya,2002).Monthlyvariations incalculated gonosomaticfemale)andafurther131(68female,63male)octopuseswere indicesweretestedusingat-testandKruskalWallisnonpara-randomlyselectedforlaboratoryanalysis.Allfield-sampledocto- metricanalysis.puseswerere-assignedamaturitystagebasedonthelaboratory Weightfrequency distributions wereplottedtoshowdistribu-confirmationdrawnfromthesubsample. tionofoctopusweightbysexanddifferences inthemeanwere

    testedusingWelchst-test.2.3. Dataanalysesandcalculationofsexratio,biometricandlife-historyparameters 3. Results

    Sexratioswerecalculatedforeachmonthandtestedforsignifi-cantfluctuationsfromtheexpected50:50ratiousingPearsonsChiSquaredtest.

    Regression analyses were carried out on the random subsetoftheindividualsselectedforlaboratoryanalysistoinvestigatebiometric relationships between a variety ofweight and lengthmeasurements,andtodeterminewhethertotalweightorlength

    Secondarylaboratoryassessmentsshowedthatin-fieldassess-mentofmaturitywasbetween72100%accurateforfemalesand48100%formales,dependingonmaturitystage.Overalldiffer-ences between in-field and laboratory maturity estimates weresignificant(t=1.69,df=117,p=

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    D.Raberinary, S. Benbow/ Fisheries Research 125126 (2012) 190197 193Table 3Biometric relationships for male and female Octopus cyanea (total length (TL), dorsalmantle length (DML), total weight (TW), gonad weight (GW)).

    f(x)M r2 p n EquationMaleTL(DML) 0.78 0.000 523 y=7.2824x1.1975 (linear)TW(TL) 0.83 0.000 523 y=0.057x2.2052 (power)TW(DML) 0.87 0.000 523 y=1.858x2.5745 (power)TW(GW) 0.87 0.000 1675 y=78.275x+185.01 (linear)FemaleTL(DML) 0.82 0.000 380 y=7.2756x0.6324 (linear)TW(TL) 0.87 0.000 380 y=0.0379x2.3004 (power)TW(DML) 0.89 0.000 380 y=1.602x2.6364 (power)TW(GW) 0.15 0.000 1578 y=14.422x+770.52 (linear)

    furthermaturitystages.ItwasnotpossibletoclassifyfemalesashigherthanstageIIIinthefield.Thematuritystageofmaleswasfrequently overestimated in in-field measurements, with malescommonlyclassedasstageIIwhenlaboratorystudiesshowedtheywereinfactstageI.Itwasnotpossibletounderestimate stageI,oroverestimatestageIIIindividualsastheserepresentthelowestandhigheststageswhichcanbeidentifiedinthefield,sothesevaluesarerecordedasnotapplicable(n/a)(Table2).

    Wefoundstrongcorrelationsbetweentotallength(TL),dor-salmantlelength(DML)andtotalweight(TM)forbothfemalesandmales(Table3).Similarly,gonadweight(GM)inmaleswasalsostronglycorrelatedtototalweight(r2=0.87).Therelationshipbetweentotalweightandgonadweightwasverymuchweakerforfemales(r2=0.15).

    The gonosomatic index (GSI) generally showed very littlevariation throughout the study period for females (range=0.23,variance=0.004)withtheexceptionofadistinctpeakinSeptember(Fig. 2).This peakwas very slightly significantwhen comparedwith grouped samples from all other months (t=1.79, p=0.04).In contrast, theGSI formales varied more throughout the year(range=0.38,variance=0.017)andbetweenmonthvariationwasstatisticallysignificant(X2=93.57,df=9,p=

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    194 D.Raberinary, S. Benbow/ Fisheries Research 125126 (2012) 190197

    Fig.4. Weight distributions for male and female octopuses sampled.Theresultsshowedtwosignificantpeaksinrecruitment,whena

    greaternumberofindividualsweighinglessthan200gwerecaught(females:t=3.06,p=

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    D.Raberinary, S. Benbow/ Fisheries Research 125126 (2012) 190197 195

    Fig. 6. Number and percentage change in sequential stages of maturity (assessed in the field) of male octopuses during the 12 months of sampling (total n=1677). Noindividuals are recorded for January 2006 due to the fishery closure during this time.

    Fig.7. Numberandpercentage of individualsatdifferentstages ofmaturity (basedon fieldobservations,verified through laboratory subset)of female octopusesduring the12 months of sampling (total n=1581).

    We found that 50% maturity of male and female octopusesoccurredat643gand2246grespectively.Thisissimilartofind-ingsforO.vulgarisinSpain(903gand1788g;Oteroetal.,2007)butmuchhigherthanpreviousresearchonO.cyaneainTanzania(320gand600g;GuardandMgaya,2002),indicatingthatthevastmajor-ityoffemaleoctopusescaughtinAndavadoakasartisanalfisheryarelikelytobeimmature.Just8%(n=130)offemaleindividualswereheavierthan2246gwhereas67%(n=1123)ofmalescaughtwereheavierthanthe643gaveragesizeatfirstmaturity.

    Fig.8. Monthly variation in O. cyanea recruitment index (percentage of total catch

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