Proceedings - Expert Consultation on Indian Ocean Tunas
http://hdl.handle.net/1834/17813
2024-03-28T11:49:01ZCatch status of tropical tunas and swordfish by Taiwan deep sea tuna fishery in the Indian ocean in 1999.
http://hdl.handle.net/1834/72
Catch status of tropical tunas and swordfish by Taiwan deep sea tuna fishery in the Indian ocean in 1999.
Chang, S.K.; Liu, H.C.
There were about 341 deep-sea longliners operating in the Indian Ocean (small longliners operating in the northeast Indian Ocean were not included) in 1999, about the same level to 1998. The total catch made by these longliners was roughly estimated as 99,000 MT, a decrease of about 11,000 MT from 1998. The drop of yellowfin tuna by 5,700 MT was the main cause, followed by decreases of bigeye tuna by 2,600 MT and swordfish by 2,100 MT. This decrease in catch might be due to the unfavorable fishing condition around the traditional fishing grounds in the Indian Ocean. In general, the total catch of tunas and billfishes was around 93,000-110,000 MT from 1992 to the present except the relatively high catch in 1993.
'Research Group' Overseas Fisheries Development Council, Taipei, Taiwan
; Institute of Oceanography, National Taiwan University, Taipei, Taiwan.
2000-01-01T00:00:00ZPreliminary studies of age and growth of bigeye tuna (Thunnus obesus) in the western Indian Ocean.
http://hdl.handle.net/1834/71
Preliminary studies of age and growth of bigeye tuna (Thunnus obesus) in the western Indian Ocean.
Stequert, B.; Conand, F.
The age and growth of Bigeye tuna from the western Indian Ocean was investigated using both otolith and first dorsal spine. Microincrements, considered as daily depositions , were observed on transverse section of sagittal otoliths of 154 bigeye tuna (Thunnus obesus); they were counted to determine age and establish growth curve. The von Bertalanffy growth curve is FL = 303.9 (1 – e-0.000397 ( t+167.15)), where FL is fork length in cm and t in days. The fish reaches 58 cm at 1 year, 91 cm at 2 years and 120 cm at 3 years of age. We also studied growth by analysing marks on the first dorsal spine of 140 fish. For fish which are 1 and 2 years old, the results obtained with spine and otoliths are comparable, but they are different for older fish .
'Research Group' Centre IRD de Brest, BP 70, 29280 Plouzané, France
; Laboratoire d’Ecologie Marine, Université de la Réunion, 97715 La Réunion, France.
1998-01-01T00:00:00ZPreliminary scheme of large scale swordfish (Xiphias gladius) in the Indian Ocean.
http://hdl.handle.net/1834/70
Preliminary scheme of large scale swordfish (Xiphias gladius) in the Indian Ocean.
Poisson, F.; Taquet, M.
Besides the difficulties in gathering sufficiently reliable fisheries data for stock assessment, the problems of determining stock structure, the spatial distribution, the mixing zones remains the important factors to realize a stock assessment project. In parallel with other techniques like biological, chemical, parasitical tags (otolith, DNA and parasite), the tag could contribute towards providing a better knowledge on the migration pattern of swordfish betwe en the Indian Ocean towards the Atlantic (South Africa) or the Pacific (Australia). Within a particular stock, the knowledge of the individual behavior in a smaller area could help to model the spatial distribution following the size and/or the sex that ca n be indispensable for VPA Analysis.
'Research Group' Ifremer Laboratoire Ressources Halieutiques, B.P. 60, 97822 Le Port — Cedex — La Reunion (océan Indien) Email: fpoisson@guetali.fr, Marc.Taquet@ifrerner.fr.
1998-01-01T00:00:00ZTuna Data Collection and Processing in Mauritius.
http://hdl.handle.net/1834/69
Tuna Data Collection and Processing in Mauritius.
Norungee, D.; Munbodh, M.
The AFRC has been conducting research on tuna since 1985 with emphasis on the collection of catch/effort data and length frequency data. A computer system for data collection, codification and processing similar to that which was used in the Atlantic Ocean has been set up at AFRC since 1987 by IRD (ORSTOM) scientists in particular Dr Patrice Cayré. Mauritian technicians have been trained to use the system, to collect tuna data and perform the necessary processing to produce various tuna statistical reports.
'Research Group' Albion Fisheries Research Centre, Mauritius.
1998-01-01T00:00:00Z