ANALYSIS OF TUNA FISHERY ALONG THOOTHUKUDI COAST OF TAMIL NADU

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dc.contributor.advisorSUNDARAMOORTHY, B
dc.contributor.authorRAMESH KUMAR
dc.contributor.otherNEETHISELVAN, N
dc.contributor.otherATHITHAN, S
dc.date.accessioned2018-02-06T09:00:07Z
dc.date.available2018-02-06T09:00:07Z
dc.date.issued2017
dc.description.abstractThe present study was carried out from June 2016 to May 2017 to analyse of tuna fishery along Thoothukudi coast of Tamil Nadu. The data on tuna fishery were collected from Tharuvaikulam, Therespuram, Thoothukudi Fishing Harbour and Kombudurai fish landing centers of Thoothukudi coast. Fishing crafts such as mechanized and motorized gillnetters (13.41 to 18.28 m OAL), trawlers (12.19 to 27.43 m OAL) and FRP boats (8.22 to 10.05 m OAL) and fish gears namely drift gillnets (mesh size 120 to145 mm), longlines (hook size 5 to 7), handline (hook size 4 to 7) and trawl nets (codend mesh size 20 mm) were found employed in exploitation of tuna fishery resources of Thoothukudi coast. Of the four types of fishing gears employed in exploitation of tuna fishes along Thoothukudi coast, only drift gillnets were found operating by targeting tuna. There were 43 tuna fishing grounds reported from the distance of 9 to 110 Nm from shoreline along Thoothukudi coast. The fishing crafts were operated for both single day and multiday at a depth ranging from 20 to 500 m. Tuna fishery of Thoothukudi was supported by six species including four coastal tuna (Euthynnus affinis, Auxis thazard, Auxis rochei and Sarda orientalis) and two oceanic tuna (Thunnus albacares and Katsuwonus pelamis). Out of six, four species of tuna viz. Thunnus albacares, Katsuwonus pelamis, Euthynnus affinis and Auxis thazard were reported throughout the year, whereas two species Auxis rochei and Sarda orientalis landed seasonally. Tuna fishing was recorded throughout the year along Thoothukudi coast with peak during June to September. Of the six tuna species reported along Thoothukudi coast, two oceanic species namely T. albacares (56.25 %) and K. pelamis (19.46 %) were found to contribute to as much as 75.71 % in the total tuna catch. The coastal tunas such as E. affinis (16.85 %), A. thazard (6.03 %), A. rochei (1.09 %) and S. orientalis (0.33 %) together contributed 24.29 % to the total tuna catch. Maximum tuna catch was contributed by large meshed drift gillnets with 98.75% of total tuna catch followed by longlines, trawl nets and handlines with 0.75%, 0.42% and 0.08% respectively. Fish landing center-wise analysis of tuna catch shows that Tharuvaikulam, Therespuram, Thoothukudi Fishing Harbour and Kombudurai contributed 75.03%, 24.18%, 0.42% and 0.37% of the total catch respectively. The maximum CPUE was recorded for drift gillnet multiday fishing (454.22 Kg/day) during July 2016 and minimum (0.35 Kg/day) for trawl net single day fishing during November 2016. Maximum CPUE was observed for yellowfin tuna (267.24Kg/day) during July 2016 and minimum for little tuna (4.97 Kg/day) during April 2017 in large meshed drift gillnet. Length frequency distribution, growth parameters, mortality parameters and fishing pressure were studied for the four species of tuna by using FiSAT II software package. In the present study, the exploitation ratio (E) was obtained as 0.59, 0.55, 0.57 and 0.65 for the species T. albacares, K. Pelamis, E. affinis and A. thazard respectively. In the case of T. albacares the fishing pressure was observed the maximum on the length group of 65 cm, before its first maturity. Hence, the existing mesh size of large meshed drift gillnets needs to be increased to make the young T. albacares escape and allow to breed. Three tuna species namely K. pelamis, E. affinis and A. thazard showed a similar pattern of fishing pressure on the length group that is well above the length at their first maturity. In addition to the gillnets, the fishermen of Thoothukudi may be encouraged to go for deepsea long lining.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810040447
dc.language.isoenen_US
dc.pages124en_US
dc.publisherFisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries Universityen_US
dc.subFisheriesen_US
dc.subjectnullen_US
dc.themeANALYSIS OF TUNA FISHERY ALONG THOOTHUKUDI COAST OF TAMIL NADUen_US
dc.these.typeM.Scen_US
dc.titleANALYSIS OF TUNA FISHERY ALONG THOOTHUKUDI COAST OF TAMIL NADUen_US
dc.typeThesisen_US
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