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Comparison of Two Different Types of Basket Trap on Fish

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Comparison of Two Different Types of Basket Trap on Fish TurkJVetAnimSci 29(2005)743-749 ©TÜB‹TAK ResearchArticle ComparisonofTwoDifferentTypesofBasketTraponFishCatches in‹skenderunBay MustafaÇEK‹Ç VocationalCollegeofYumurtal›k,ÇukurovaUniversity,Yumurtal›k,Adana-TURKEY Tar›kDAL FacultyofFisheries,MustafaKemalUniversity,Antakya,Hatay-TURKEY NuriBAfiUSTA AtaFisheriesResearchCenter,AtatürkBarrage,HarranUniversity,Bozova,fianl›urfa-TURKEY MahmutAliGÖKÇE FacultyofFisheries,ÇukurovaUniversity,Adana-TURKEY Received:20.08.2003 Abstract: Thepresentstudyaimedtodeterminetherelativecatchefficienciesoftwodifferentfishtrapsin‹skenderunBay.Trap modelAhadanentrancesupportedbyahoop,whilsttheentranceofmodelBwasunsupported.Fieldworkwascarriedoutin Pirinçlik-MadenliBight(‹skenderunBay)between15Julyand15November2001.Fortybaskettrapswereseteachdayduringthe 124-daystudyperiod.Overall1242individuals,16speciesand11familiesoffishandcommercialinvertebrateswererecorded.The totalbiomasswas317.73kg.Fishingeffort,irrespectiveoftrapmodelswas0.25%andthehighestcatchweightwasinAugust, SeptemberandOctober.Theamountofby-catch(0.04kg)anddiscards(0.07kg)werequitelow. KeyWords: Trapfishing,catchweight,‹skenderunbay ‹skenderunKörfezi’ndeKullan›lan‹kiFarkl›SepetModelinin Bal›kYakalamayaEtkisi Özet: Buçal›flmada,‹skenderunKörfezi’ndekullan›lanikifarkl›sepetmodelininavverimineetkisininbelirlenmesiamaçlanm›flt›r. Çal›flmada,AModelSepet(GirifliKasnaklaDesteklenmifl)veBModelSepet(GirifliKasnaklaDesteklenmemiflSilindirikSepet) modellerikullan›lm›flt›r.Araflt›rma,‹skenderunKörfezi’ninPirinçlik-Madenlikoyunda,15Temmuz–15Kas›m2001dönemleri aras›ndayap›lm›flt›r.124çal›flmagünüboyuncahergün40sepetdenizeb›rak›lm›flt›r.Çal›flmasonunda11familyayaait,16tür ve bal›kveekonomikomurgas›ztürolmaküzeretoplam1242adetbireykaydedilmifltir.Toplamcanl›kütle317,73kg’d›r.Sepet modelleridikkateal›nmaks›z›navlamaçabas›%0,25veenyüksekavverimiA¤ustos,EylülveEkimaylar›ndaolmufltur.Tüm çal›flmaiçinbulunan0.04kghedeflenmeyentürlerve0,07kg›skartamiktarlar›oldukçadüflükbulunmufltur. AnahtarSözcükler: Sepetavc›l›¤›,avmiktar›ve‹skenderunkörfezi Introduction Gobert(1)studieddensity-dependentsizeselectivity Trawl,long-lineandfishtrapsarethemostcommon inAntilleanfishtrapsandreportedthatsizeselectionof fishingtechniquesusedindemersalfisheries.Whereas fishtrapsnotonlydependedonmeshsize,butalso trawlsandlong-linesmaybedifficulttooperateonsome location,duetospatialdifferencesinthelengthfrequency fishinggrounds,demersaltrapscanbethepredominant offish.Robichaudetal.(2)andFerrelandStewart(3) gearusedinsuchhabitats.Furthermore,theincreased indicatedthatselectivitymightchangewithchanging concernontheimpactsoftowedgearsonseabedhabitats meshsizeandshapeandfishbodysize.Thedesignand hasalsohighlightedthepotentialbenefitsofnon-towed modeloffishtrapalsoaffectsthecapturesuccessof fishinggears.Therefore,therehasbeenincreased Blackseabass(Centropristisstriata)(4). researchbyfisheriesscientistsonthecatchratesoffish Theprimaryfishinggearsusedinthemultispecies trapsinrecentyears. demersalfisheriesof‹skenderunBayareottertrawl, 743 ComparisonofTwoDifferentTypesofBasketTraponFishCatchesin‹skenderunBay long-lineandfishtraps.Avarietyoffishtraps 035º51’E;36º25’N,035º51’E;36º34’N,036º02’E) (rectangular,cylindrical,diamondshape,semispherical between15Julyand15November2001.Fortybasket andflattraps),withvariousmeshsizesareusedtotarget trapswereseteachdaybyacommercialfishingvessel variousshrimpspecies,crabandfish. duringthe124-daystudyperiod,resultinginatotalof Fishtrapsusedbylocalfishermenaregenerally 4960settingsinthestudyarea(Figure2). cylindrical,metalframed,approximately40-50cmin The40trapsweredeployedintwosets,eachset heightand65-70cmindiameter,withanapproximate consistingof10type-A(entrancesupportedbyahoop) volumeof0.2m 3.Theyhaveasingleentrancefunnelon and10type-B(entrancenotsupportedbyahoop)traps onesideand30-35mmmeshsize(Figure1). (Figures3,4)connectedtoeachotherconsecutivelyasa Thebaitedtrapsareusuallydeployedat40-50m longline. depths.Groupers( Epinephelusaeneus,Epinephelus Thedistancebetweentrapswas6.5m1-1.5kgof marginatus),whiteseabream( Diplodussargus ),red Sardine(Sardinapilchardus)wasusedasbait.Fishingwas porgy( Pagruspagrus ),commonpandora( Pagellus carriedoutonarockyareaandatadepthof35-60m erytrhinus),axillaryseabream(Pagellusacarne),blennies (Figure5). (Blennidae),greaterweever( Trachinusdraco)andsand Thetotallength(mm)andwetweight(±0.01g)of steenbras(Litognathusmorrmyrus)arethemainspecies fishwererecordedforallcatchesandanonewayANOVA caughtbythesetraps(5). testwasappliedusingSPSS12.0todeterminewhether Althoughtherewerenoavailabledataongear therewasasignificantdifferenceinthecatchweightof selectivity,catchratesandcomposition,by-catchand thetwotypesoftrap. discardrates,overfishinghasbeenattributedtoexcess ‘CatchperUnitEffort’wascomputedwithequation fishingeffortand,asaconsequence,theuseoffishtraps below, wasbannedbytheMinistryofAgriculturein2000 becauseofthepossiblenegativeeffectsonfishstocks. FishingEffort=CatchRate/NumberofTraps Therefore,Thepresentstudyaimedtodeterminethe relativecatchefficienciesoftwodifferentfishtrapsin ‹skenderunBay. Theobjectiveofthecurrentstudywastodetermine theeffectoftwodifferenttypesofbaskettrapsonfish TURKEY catchesin‹skenderunBay. DÖRTYOL MaterialsandMethods Researchwascarriedoutinastationlocatedthe YUMURTALIK Pirinçlik-MadenliBight,‹skenderunBay(36º29’N, KARATAfi WORKINGAREA 30mm ISKENDERUN 30mm MEDITERRANEAN ULUÇINAR 20mm Figure1. Shapeanddimensionsofmeshwirecoveringthetraps. Figure2.Locationofexperimentalfishing. 744 M.ÇEK‹Ç,T.DAL,N.BAfiUSTA,M.A.GÖKÇE MetalFrame(8mm) WireMesh MetalFrame(8mm) WireMesh 10-15cm 45-50cm 6-7cm 20-25cm 45-50cm 30-35cm 30-35cm 60-70cm 65-70cm Figure3.Amodelfishtrap(entrencesupportedbyhoop). Figure4.Bmodelfishtrap(entranceunsupportedbyhoop). 300 Buoy 250 Polypropilen(4mm) 200 PolypropilenRope(3.5mm) 150 ABAB 100 FishTotalCatch AModelTrap bModelTrap 50 Figure5.Traplonglineusedinthestudy. 0 AModelTrap bModelTrap July August September October November Results Figure6. Distributionsoffishcaughtbytwotypesoftrapsaccording tomonths. Atotalof1242individualsbelongingto16species and11familiesoffishandcommercialinvertebratewere Thehighestcatchweightinthestudywasobservedin caught(Table1).Thetotalcatchweightofthese August,SeptemberandOctober(Figure6). individualswas317.73kg.Thenumberoffish, crustaceansandcephalopodswere1178,51and13 Theresultofthecurrentstudyindicatedverylow respectively.Sea-breams(Sparidae)andGroupers discardratesforbothtypesoftrapduringthefishing (Serranidae)werethedominantfishspeciescaught. period(Tables4,5).Targetfishundertheminimumlegal sizewerenotconsideredasdiscard.Discardfishwere Althoughthecatchrateandtotalweightoffish non-commercialspecies.Themortalityrateofdiscarded caughtbythetype-Atrapweregreaterthanthetype-B fishwasnotdetermined.Targetspeciesintrapfishery trap,thesedifferenceswerenotsignificant(P>0.05, arePamadasysincisus,Mycteropercarubra,Epinephelus Table2). marginatus, Epinephelusaeneus , Epinepheluscostae , Nevertheless,significantdifferencesinthecatchesof Dentexdentex,Diplodusvulgaris,Sparusaurata,Pagrus thetype-Aandtype-Btrapswereobserved,withthe coeruleostictus, Pagelluserythrinus ,andOctopus sp . meanlengthoffishcaughtbytype-Atrapshigherthan Non-targetspecies(by-catch)intrapfisheryare Balistes type-Btraps.Irrespectiveofthetrapmodels,fishing carolinensis, Alepesdjedaba,Sargocenronrubrum ,and effortperunitwas0.25%(Table3). Siganusluridus. Non-commercial(discards)species 745 ComparisonofTwoDifferentTypesofBasketTraponFishCatchesin‹skenderunBay Table1. Number(N),MeanTotallength(TL),Standarddeviation(SD)andMeantotalweight(W)offishandinvertebratescaught bytwotypesof trap. ModelA ModelB ModelAandB Species NTLSDW NTLSDW N TLSDW (cm) (kg) (cm) (kg) (cm) (kg) Balistescarolinensis 3 19.04 1.32 0.37 3 19.37 0,38 0.44 6 19.20 0.88 0.80 Alepesdjedaba 30 20.68 2.24 5.82 13 19.58 3.60 2.34 43 20.35 2.73 8.16 Echeneisnaucrates 30 42.37 1.16 10.51 27 42.08 1.31 9.46 57 42.23 1.23 19.97 Pamadasysincisus 34 13.4 2.20 2.98 37 12.89 2.43 3.07 71 13.13 2.32 6.05 Sargocenronrubrum 14 16.14 2.01 1.14 9 15.68 1.31 0.63 23 15.96 1.75 1.77 Gymnothoraxunicolor 11 23.36 4.18 0.60 10 21.40 3.86 0.54 21 22.43 4.06 1.14 Siganusluridus 1 15.7 0.00 0.15 - - - - 1 15.7 0.00 0.15 Mycteropercarubra 10 39.06 7.17 7.88 8 32.95 12.47 4.92 18 36.34 10.05 12.80 Epinephelusmarginatus 2 39.65 4.17 1.78 4 36.88 7.27 3.16 6 37.80 6.11 4.94 Epinephelusaeneus 80 32.94 8.85 42.91 67 32.83 7.26 33.02 147 32.89 8.14 75.93 Epinepheluscostae 31 32.28 6.21 14.34 26 27.77 7.03 9.00 57 30.22 6.91 23.34 Dentexdentex 1 31.9 0.00 0.50 - - - - 1 31.9 0.00 0.50 Diplodusvulgaris 86 16.18 3.43 10.16 87 16.12 3.80 10.70 173 16.15 3.61 20.86 Sparusaurata 96 19.95 4.17 17.67 105 17.46 4.10 15.83 201 18.65 4.30 45.76 Pagruscoeruleostictus 163 22.31 7.13 46.79 181 20.85 5.91 44.33 344 21.55 6.55 91.12 Pagelluserythrinus 2 17.70 0.42 0.16 7 18.96 1.73 0.83 9 18.68 1.60 0.99 Octopus sp. 10 - - 11.503 - - 4.20 13 - - 15.70 Callinectessapidus 26- - - 25 - - - 51 - - - TOTAL630-- 142.471242-- 175.26612-- 317.73 Table2.Totalnumberandweightoffishcaughtbytwotypesoftrap. Catch Weight TrapModel Number % kg % A 630 50.72 187.52 56.83 B 612 49.28 142.47 43.18 Total 1242 100 329.98 100 (Discard)intrapfisheryare Echeneisnaucrates , Minimumlegalsizesofeightspeciesarenotknown Gymnothoraxunicolor,andCallinectessapidus. anddataobtainedforfiveofthespeciesweresufficient Therewasnosignificantdifferenceontheamountsof forevaluation.Themajorfindingisthatthenumberof targeted,by-catchanddiscardedfishbetweenthetwo inappropriatesizeoffishwhoseminimumlegalsizes trapdesigns.However,catchweightofmodelAwas
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