Recent Submissions

  • Report of the Third Session of the IOTC Working Party on Tagging

    2001
    The report of the session is presented under the following major section headings: 1) Opening of the meeting; 2) Progress in the acquisition of funds for financing the tagging programs; 3) The problem of bait; 4) Development of specific plans for the pilot programmes - ; and other matters, 5) Equipment needed for the pilot studies – 6) Review of the main IOTTP. The IOTTP slide show is also included.
  • Report of the first session of the IOTC Working Party on Tropical Tunas.

    1999-09
    The emphasis of the meeting was placed on bigeye tuna (Thunnus obesus), but a number of the conclusions and recommendations reached apply equally to all tropical tunas. A review of fisheries and available data confirmed that both longline and purse seine fisheries for bigeye tuna have been expanding rapidly over the current decade. There are however major gaps in catch and effort data available, in particular major longline fleets operating from Indonesia and several eastern Indian Ocean ports and some which are engaged in illegal, unregulated and unreported (IUU) fishing. Furthermore, size data for most longline fisheries are generally missing or of doubtful quality. A number of recommendations on research were formulated, dealing with improvements in fisheries and biological data collection and diffusion and with stock assessment. In particular, the process for estimating IUU catches through a vessel registry, landings database and port sampling proposed by the Permanent Working Party on Data Collection and Statistics was endorsed. The lack of reliable data limited the possibilities of conducting rigorous stock assessments; however, a number of indices were examined which, taken together, led to the conclusion that bigeye tuna stocks might be fully or overexploited. The WPTT therefore recommended an immediate halt to the increase in catches from all gears. In addition, it was deemed necessary to cut short the increased catches of juvenile bigeye tuna by purse seines fishing on FADs. A number of ways of achieving this were proposed, the most promising being suggested as time and area closures on log fishing. Some indices of skipjack (Katsuwonus pelamis) catches led to the conclusion that there may also be signs of at least localised overfishing, with possibilities of interactions between the central Indian Ocean purse seine fishery and the Maldivian pole-and-line fishery. Finally, the WPTT discussed and proposed Terms of Reference of the Working Party on Tagging. Wide-scale tagging of tropical tunas is seen as an urgent priority and a number of immediate actions were identified.
  • Indian Ocean tuna fisheries: Data summary for 1990-1999

    Anon (2003)
    Catch statistics and fishing craft statistics are presented for the Indian Ocean tuna fisheries. The former are presented by species, country, year and by gear. Details are also given of the number of fisheries crafts in the national fleets, in order to provide information on the economic and technical development of the fisheries and to provide an approximate idea of fluctuations in fishing effort.
  • Indian Ocean tuna fisheries: Data summary for 1991-2000

    Anon (2002)
    Catch statistics and fishing craft statistics are presented for the Indian Ocean tuna fisheries for the period 1991-2000. The former are presented by species, country, year and by gear. Details are also given of the number of fisheries crafts in the national fleets, in order to provide information on the economic and technical development of the fisheries and to provide an approximate idea of fluctuations in fishing effort.
  • Indian Ocean tuna fisheries: Data summary for 1990-1999

    Anon (2001)
    Catch statistics and fishing craft statistics are presented for the Indian Ocean tuna fisheries for the period 1990-1999. The former are presented by species, country, year and by gear. Details are also given of the number of fisheries crafts in the national fleets, in order to provide information on the economic and technical development of the fisheries and to provide an approximate idea of fluctuations in fishing effort.
  • Indian Ocean tuna fisheries: Data summary for 1987-1996

    1998
    Catch statistics and fishing craft statistics are presented for the Indian Ocean tuna fisheries for the period 1987-1996. The former are presented by species, country, year and by gear. Details are also given of the number of fisheries crafts in the national fleets, in order to provide information on the economic and technical development of the fisheries and to provide an approximate idea of fluctuations in fishing effort.
  • Ocean tuna fisheries. Data summary for 1989-1998.

    2000
    Annual nominal catch statistics and fishery fleet statistics are presented for the Indian Ocean tuna fisheries for the period 1989-1998. The former are presented by species, country, year and by gear. Details are also given of the number of fisheries crafts in the national fleets, in order to provide information on the economic and technical development of the fisheries and to provide an approximate idea of fluctuations in fishing effort. Nominal catch data are also distributed together with a programme for data query and analysis, FISHSTAT PLUS, available through the IOTC Web site (http://www.iotc.org) or, on request, by e-mail, on magnetic media or CD-ROM.
  • Tuna Data Collection and Processing in Mauritius.

    Norungee, D.; Munbodh, M. (IOTC, 1998)
  • Statistics of the purse seine NEI fleet in the Indian Ocean.

    Pallares, P.; Delgado de Molina, A.; Pianet, R.; Ariz, J. (IOTC, 1998)
  • Which tuna research in Indian Ocean?

    Fonteneau, A.; Marsac, F.; Pianet, R.; Stequert, B. (IOTC, 1998)
  • Review and research plan on the stock structure of yellowfin tuna (Thunnus albacares) and bigeye tuna (Thunnus obesus) in the Indian Ocean

    Nishida, T.; Chow, S.; Grewe, P. (IOTC, 1998)
    Yellowfin and bigeye tuna are the most important tuna species in the Indian Ocean, this paper reviews the stock structure of these two species and describes research plans based on the review.
  • Preliminary analysis of billfish catch rates in the Indian Ocean.

    Campbell, R.A.; Tuck, G.N. (IOTC, 1998)
    Due to the general lack of targeted fisheries on billfish, the resource status of these species within the Indian Ocean has not been analysed in any previous study and currently remains unknown. Nevertheless, significant quantities of billfish are caught annually in the Indian Ocean and, being generally long lived, these species remain vulnerable to overfishing. In this paper preliminary indices of stock availability are presented for the main billfish species based on the catch and effort data pertaining to the Japanese and Taiwanese Indian Ocean longline fisheries. While the indices need to be treated with some caution (due to problems relating to the accuracy of the catch and effort data, and the fact that changes in catchability have not been factored into the analyses), the declines observed in the indices for black marlin, striped marlin and sailfish/spearfish warrant further investigation. In particular, further effort needs to the put into accounting for changes in targeting practices and the other changes in the fishing gears used.

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