Validation of tuna Potential Fishing Zone advisories of Lakshadweep with a note on tuna habitat preferences and biolog

Abhilash, K S

Jeyabaskaran, R

Koya, K P Said

Kripa, V

Kuberan, G

Nair, Preetha G

Padua, Shelton

Prema, D

Suhail, Mohammed

Vishnu, P G

CMFRI Digital Repository

I VALIDATION OF TUNA POTENTIAL FISHING ZONE ADVISORIES OF LAKSHADWEEP WITH - -- - .A NOTE ON T!!NA HABITAT PREFERENCES AND BIOLOGY u CMFRI Kripa V*, Said Koya K.P, Jeyabaskaran R, Shelton Padua, D.Prema, Abhilash K.S., - Preetha ~ G Nair Mohammed Suhail. Kuber Ganesh. and Vishnu l?G -I.- Y Introduction --. -- q- Other tuna resources What does the tuna feed on? Almost all stomach of the skipjack tuna caught from Agathi Island had the bait fishes Spratelloides delicatulus and Apogon sp. Tuna is the major fishery resource of Lakshadweep Islands . -- With an aim to help the fishermen to locate tuna fishing grounds, the Indian National Centre for Ocean Information Services based at Hyderabad developed the fishery advisories. ! * The second major resource was Thunnas albacores with Thunnc 'bacares Yellowfin tuna catch rate ranging between 4 While the gut of yellow fin tuna from Androth had Spratelloides gracilis, Charybdis smithii and Decapterus russelli. Some fishes had fully digested flesh in the gut 60kg in ~anua;;/ and 475 kg in February 2016. - Common size in commercial catches - 50-150cm Objective The main objective of the Gut content analysis of tuna Euthynus affifis Kawakawa, Euthynus affiifis was Little tunn obtained in the fishery only during October to December 2015 and the study was to validate the tuna P F Z  a d v i s o r y  f o r  Lakshadweep catch per boat ranged between 8.3 to 115 kg. Pictures from fishbasc Methodology The advisories were shared with fishermen of the island and validation was done lZC- I  omp par is ion or catch of different large pelagics In ~ovember ~ u r j  901.25 !i 0 PFZ -E 600 Non PFZ s .- I:: r979 I from Minicoy, Androth, Kavarathi and Kalpeni during the period August 201 5 to March 201 7. The length of the major species landed from the PFZ area and the gut content of the tuna was analysed using standard methods. Asurvey was coiducted tounderstand fishers opinion about usefulness of PFZ Bait fishes -Spratelloides gracilis from gut of tuna I Validation The Tuna PFZ advisories released by the INCOlS were validated through 20 boats at Minicoy, 15 at Andrott, 5 at Kavarathi and 6 at Kalpeni. Altogether 46 boats were involved in PFZ validation in Lakshadweep Islands during the reporting period. The catch composition, total number and weight and the price per kg of each resource and the total income per boat were noted from the boats which operated in the PFZ areas. Non-PFZ areas were also evaluated for comparisons Katsuwonus pelamis Thunnus olbacares Elagottis bipinnulata 1°00 1 Comparison of catch of different large pelagics C m 800 - in January 2016 Squid Apogon &I PFZ 0 -'i z: 1 465, , Y .- JZ U 200 U 233 , , m o  , 0 Results Higher catch were obtained at PFZduring certain months. It was observed during August and October the catch was higher by 87 and 31 % respectively in PFZ areas than non PFZ areas. The profit was nearly 90% more in August, but in October the profit was at par Katsuwonus pelamThunnus albacar&agattis bipinnulata E.affinis I 250000 - Variation in income per boat operated from a PFZ and Yo~~5PFZ area 200000 - 179731 171434 . PFZ ~150000 - al n Non PFZ ~100000 - 74500 50000 - 0 8 with non PFZ area. Durina Novemberto February, the catch was higher in the non PFZ area at Aaathi, Post ~ a r v e s t l d b k e  drying of tuna ~ i n i c o ~  and ~ndor th .  - - 2016-17 - good landing of skipjacktuna. Major share was used for preparation of masmin (smoked Sometimes at PFZ location dolphins, small fishes and other larger fishes which tuna). The market price of masmin - approximately 450 - 550 INR depending on the size. Recently a firm r A. solndri r lstiophorus plotypterus I Coronx ignobilis r Auxis thozonl r Elagottis bipinnuloto Fishers opinion I Thunnus albacores Few fishermen follow the PFZ advisory but most of the times they get good catch at nearby grounds. They are reluctant to travel longer distance predicted by PFZ advisory for fishing since they get catch at I Kotsuwonus pelomis The seconds in latitude- longitude coordinate is not providing them the right direction to the fishing information provided by theotherfishermen. PFZ advisories are useful. Sometimes at PFZ locar~on they find the presence of dolphins, small flshes and other largerfishes which do not have good market value. During such occasions, they don't get tuna catch atthe fishing ground 6-- Conclusion - - The tuna PFZ advisories of INCOlS indicate the occurrence of tunas in most instances. However, sometimes PFZ occur in distant areas and fishermen find it difficultto reach the haveto be identified. August -2016 Comparison between PFZ and Non This manuscript is the result of three projects: 1. Project of Fishery Environment Management Division of 5afen Tunapostwed1ted9p3f PFZ Price (Rs) CMFRI and two projectsfunded by Ministry of Earth Sciences, 1) Towards Developing Model For Prediction o 13200 of Recruitment Success in Major Indian Marine Fish Stocks, funded by CMLRE and 2)Eco-biological Katsuwonas pelamis investigations on major pelagic fishes and ecological modeling of the epipelagic habitat off Kerala and (Skipjack tuna) validation of tuna fishery advisory for Lakshadweep. We thank Dr A.Gopalakrishnan, Director CMFRI, Dr. M. Sudhakar Director CMLRE and Dr. S.S.C. Shenoi Director INCOlS for the support. We October February Overall average The average income per boat operated in a PFZ area was higher (Rs 1,79,731) than a boat which was operated in a Non PFZ area (Rs 74,500) in October indicating 58.5% more income The difference in income was lowest in February 13.6%. The average difference in income during the period October '/26?%1 to March 2016 was 16.5%. 10 

Validation of tuna Potential Fishing Zone advisories of Lakshadweep with a note on tuna habitat preferences and biology

http://eprints.cmfri.org.in/12873/1/Kripa_2018_Validation%20of%20tuna%20Potential%20Fishing%20Zone%20advisories%20of%20Lakshadweep%20with%20a%20note%20on%20tuna%20habitat%20preferences%20and%20biology_Poster.pdf

Validation of tuna Potential Fishing Zone advisories of Lakshadweep with a note on tuna habitat preferences and biology

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