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Corporate AuthorSeychelles Fishing Authority
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AbstractDue to the inclusion of trips which started at the end of 1993 but which finished in early 1994 the 1993 total catch for the WIO has been revised upwards from 275,058, Published in the last Tuna Bulletin, to 276,078 MT. The initial estimate for the total WIO purse seine tuna catch for the first six months of 1994 is 124,706 MT (the figure of 100,000 MT published in the Globefish Bulletin 3/94 was based on an early estimate). However, this figure may also be revised upwards when trips starting in the second quarter of 1994 and finishing in third quarter are included in the next quarterly Tuna Bulletin of 1994. This compares with 132,126 MT caught in the first three months of 1993. Some 2,442 days were fished in the second quarter of 1994 compared to 3,561 in the second quarter of 1993. Relative to the second quarter of 1993 this is mainly due to a considerable drop in the number of fishing days for the Japanese (from 621 to 0) and Russian purse seiners (170 to 31). The mean catch per unit effort in the second quarter was 20.23 MT/fishing day. This compared with a mean CPUE for the second quarter of 1993 of 17.13 MT/fishing days.Skipjack (Katsuwonus pelamis) comprised 66% (33,404 MT of 49,411 MT) of the total catch for the second quarter of 1994, a proportion which is identical to the 1993 second quarter figures (40,031 of 60,984 MT).Yellow fin (Thunnus albacares) comprised 24% (11,735 MT) of the second quarter catch compared to 25% (14,997 MT) in the equivalent quarter catch in 1993. Readers should be aware that this catch composition is NOT scientific. It is based on the assessment of the fishermen who write the fishing log and maybe biased. -For the current year, the most busy month for transshipment at Victoria was March when 25 vessels landed a total of 20,902 MT. Transshipment for the second quarter was 12,010 MT or a mean of 546 MT per vessel by 22 purse seiners. In the same period last year some 21,994 MT was transshipped by 50 vessels at a rate of 440 MT per vessel. It should be noted that the figure in Table 3 represent the transshipment of vessels whose trips ended in the month indicated NOT the actual month of physical transshipment of the catch. Extra tables (Table 6, 7 and 8) were added in the last edition to enable readers to compare CATCH, EFFORT and CPUE by flag and month without having to refer between tables. Please refer to the 1994 first quarter bulletin for a complete description of these improvements. Maps 1 and 2 show the geographical distribution of the purse seine catch in the WIO for the whole of 1993 and the quarter being reported upon, respectively. The area of the circle plotted in each one degree square is in proportion to the catch. In the second quarter of 1994, the catch were more concentrated in the Mozambique Channel than anywhere else in the region as observed every year. Interested readers are referred to the first quarter bulletin to see more clearly the shift in the main fishing grounds between the two quarters.
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