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dc.coverage.spatialWestern Indian Oceanen
dc.description.abstractData used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ. Sometimes there is a delay in these being received at SFA, especially during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel. Readers should be aware that many of the figures presented here (especially the most recent) are subject to revision (usually upwards) as more data become available. The date upon which the SFA database was closed prior to the generation of the statistical tables is shown at the head of each table. PURSE SEINERS PRINCIPAL POINTS: The total purse seine tuna catch for the Western Indian Ocean in 2001 is now 295,936 Mt. This catch was achieved by an average of 50 vessels licensed per month. The total effort reported for the purse seine tuna fleet during 2001 was 13,871 days, thus giving a mean catch rate of 21.33 Mt/fishing day. The catch reported by purse seiners for the Western Indian Ocean (W10) within the first semester of 2002, was 140,704 Mt. This was the result of an average of 49 purse seiners licensed per month. The catch recorded during the same period of 2001, was 119,479 Mt, achieved by an average of 51 purse seiners licensed per month. An increase of 18% in catches was therefore recorded during the first semester of 2002. The highest catch recorded so far during that period of the year was in 2000, when some 241,710 Mt of tuna were caught. The average catch rate reported for the first semester of 2002 is 22.25 Mt/day, compared to 17.51 Mt/day in 2001. The highest catch rate so far recorded for that period of the year was in 1995 when 23.81 Mt of tuna were caught per fishing day. Table I shows the species composition of the total catch reported during the first semester of 2001 and 2002. SPECIES 2001 % 2002 % YELLOWFIN (Thunnus albacares) 56,107 47 60,525 43 SKIPJACK (katsuwonus pelamis) 53,922 45 74,374 53 OTHERS (Thunnus obesus & Thunnus alalunga) 9,450 8 5,805 4 TOTAL 119,479 140,704 • Some 6,323 fishing days were recorded during the first semester 2002, compared to 6,824 days recorded during the same period of the previous year. This represent a decrease of 7% or 501 fishing days. Readers should be well aware that the catch compositions given here are NOT based on scientific sampling but on the assessment of the fishermen who write the daily catch and effort reports and who decide into which group fish should be placed. They may be biased. It should be noted that the figures in Table 3 (Purse seiner transshipment statistics by harbour of transshipment) represent the transshipments of vessels whose trips ENDED in the month indicated and NOT the actual month of physical transshipment of the catch. The total amount of tuna unloaded through Victoria during the year 2001 was 248,454 Mt. During the first semester of 2002 a total of 116,341 Mt, representing 83% of the total catch was unloaded in Port Victoria, compared to 91,622 Mt, representing 79% of the total catch, unloaded during the same period of the previous year. An increase of 27% was recorded in the amount of tuna unloaded in port Victoria in 2002. LONGLINERS. PRINCIPAL POINTS: Readers should be aware that these statistics only represent a small sample of longliners activity in the WIO because: Not all longliners fishing in the WIO have a license to fish in the Seychelles EEZ and therefore are under no obligation to report to SFA. Some Distant Water Fishing Nations (DWFN) provide SFA with log sheets covering their activity in the whole Indian Ocean while others confine their reports to the Seychelles EEZ. The statistics published for 2001 are related to 80' logbooks received at the date of publication of this bulletin and a total of 2412 licenses were issued to 169 vessels. For the first semester of 2002 we received a total of 993 logbooks for the 824 licenses issued to 64 vessels. During the first semester 2002 the number of licences taken by Japanese vessels dropped by 24%. Furthermore there were no licences taken by vessels from South Korea and Spanish vessels did not renew their licences. The number of licences issued to Taiwanese vessels increased from 24 to 54. Analyses of data collected to date show that: The total catch reported to SFA by longliners for 2001 is now 5,712 Mt. This was achieved from a fishing effort of approximately 13.9 millions hooks and an average catch rate of 0.41 Mt/1000 hooks. The total catch reported for the first semester of 2002 is 2,606 Mt, obtained from a fishing effort of approximately 4.9 millions hooks and a mean catch rate of 0.54 Mt/1000 hooks. The mean CPUE reported by nationality was: 0.55 Mt/1000 hooks for the Japanese and 0.32 Mt/1000 hooks for the Taiwanese. It should be pointed out that these statistic will be revised when more data will be available. For this same period, yellowfin (Thunnus albacores) comprised 34% of the total catch, bigeye (Thunnus obesus) comprised 36% and other species (mainly billfishes and sharks) made up the remaining 30%. During the same period of the previous year yellowfin, bigeye and other species made up 41%, 40 % and 19 % of the total catch respectively.en
dc.titleSeychelles tuna bulletin: first semester 2002en
dc.contributor.corpauthorSeychelles Fishing Authority
dc.description.otherLongliners, Tuna Statisticsen
dc.subject.asfaPurse seinersen
dc.subject.asfaCatch statisticsen
dc.subject.asfaTuna fisheriesen

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