REPORT OF THE STANDING COMMITTEE ON RESEARCH ... - Iccat

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EXECUTIVE SUMMARY BUM/WHMIt should be noted that these trends are based only on a few years of observations. Confirmation of these recentapparent changes in abundance trends of white marlin and blue marlin will require at least an additional four orfive years of relative abundance data.BUM/WHM-6. Effect of current regulationsRecommendations [Rec. 00-13], [Rec. 01-10] and finally [Rec. 02-13] placed additional catch restrictions forblue marlin and white marlin. The latter established that “the annual amount of blue marlin that can be harvestedby pelagic longline and purse seine vessels and retained for landing must be no more than 33% for white marlinand 50% for blue marlin of the 1996 or 1999 landing levels, whichever is greater”. That recommendationestablished that, “All blue marlin and white marlin brought to pelagic longline and purse seine vessels alive shallbe released in a manner that maximizes their survival. The provision of this paragraph does not apply to marlinsthat are dead when brought along the side of the vessel and that are not sold or entered into commerce”. TheCommittee estimated the catch of pelagic longline vessels for a subset of fleets that the Committee thoughtwould be expected to be affected by Recommendations [Rec. 00-13] and [Rec. 02-13]. Catches of these fleetsrepresent, for the period 1990-2007, 97% of all longline caught blue marlin and 93% of all longline caught whitemarlin. Catches of both species have declined since 1996-99, the period selected as the reference period by therecommendations. Since 2002, the year of implementation of the last of these two recommendations, the catch ofblue marlin has been below the 50% value recommended by the Commission. Similarly, the catch of Whitemarlin since 2002 has been at about the 33% value recommended by the Commission (BUM/WHM-Figure 3).This analysis represents only longline caught marlin even though the recommendations referred to the combinedcatch of pelagic longline and purse seine because the catch estimates of billfish by-catch from purse seine vesselsare more uncertain than those from longline. Over the period considered, purse seine caught marlin represent 2%of the total catch reported by the combination of purse seine and pelagic longline.More countries have started reporting data on live releases in 2006. Additionally, more information has comeabout, for some fleets, on the potential for using gear modifications to reduce the by-catch and increase thesurvival of marlins. Such studies have also provided information on the rates of live releases for those fleets.However there is not enough information on the proportion of fish being released alive for all fleets, to evaluatethe effectiveness of the ICCAT recommendation relating to the live release of marlins.BUM/WHM-7. Management recommendations− The Commission should, at a minimum, continue the management measures already in place becausemarlins have not yet recovered.− The Commission should take steps to assure that the reliability of the recent fishery information improves inorder to provide a basis for verifying possible future rebuilding of the stocks. Improvements are needed inthe monitoring of the fate and amount of dead and live releases, with verification from scientific observerprograms; verification of current and historical landings from some artisanal and industrial fleets; andcomplete and updated relative abundance indices from CPUE data for the major fleets.− Should the Commission wish to increase the likelihood of success of the current management measures ofthe marlin rebuilding plan, further reduction in mortality would be needed, for example by:− implementing plans to improve compliance of current regulations,− encouraging the use of alternative gear configurations, including certain types of circle hooks, hook/baitcombinations etc., in fisheries where its use has been shown to be beneficial,− broader application of time/area catch restrictions.−−Given the recent importance of the catch from artisanal fisheries, and to increase the likelihood of recoveryof marlin stocks, the Commission should consider regulations that control or reduce the fishing mortalitygenerated by these fisheries.While substantial research into habitat requirements of blue and white marlin have been undertaken since thelast assessments, the results of this research are not yet sufficient to allow the Committee to reach scientificconsensus on the best method for directly estimating MSY benchmarks for these species based on thecomplete time-series of data. The Commission should encourage continued research on development ofmethods to incorporate this information into stock assessments in order to provide a basis for increasing thecertainty with which management advice can be provided.93
ICCAT <strong>REPORT</strong> 2008-2009 (I)Atlantic blue marlin and Atlantic white marlin summaryWHMBUMB 2004 < 1 B MSY Yes YesRecent Abundance TrendSlightly upwardPossibly stabilizing(2001-2004)F 2004 > F replacement No PossiblyF 2004 > 1 F MSY Possibly Yes2 Catch recent /Catch 1996 Longline0.47 0.52and Purse seine3 Catch 2004 610 t 2,916 tRebuilding to B MSY1 MSYPotential to rebuild under currentmanagement plan but needsverification.Potential to rebuild under currentmanagement plan but needsverification.4600-1,320 t ~ 2,000 t (1,000 ~ 2,400 t)1 As estimated during the 2000 (Anon. 2001) and 2002 (Anon. 2003a) assessments.2 Catch recent is the average longline catch for 2000-2004.3 Estimate of total removals obtained by the Committee. The Task I catch reported for 2006 is 2,182 t for blue marlin and 387 t for whitemarlin. The preliminary Task I catch reported for 2007 is 2,303 t for blue marlin and 302 t for white marlin. Final estimates for 2005-2007are likely to be greater.4 Range of estimates were obtained in the previous assessments, but recent analyses suggest that the lower bound for white marlin should beat least 600.94
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INTERNATIONAL COMMISSION FOR THECON
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SCRS PLENARY SESSIONS 1 to 8The Coo
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ICCAT REPORT 2008-2009 (I)There is
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SCRS PLENARY SESSIONS 1 to 8Korean
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SCRS PLENARY SESSIONS 1 to 8Senegal
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SCRS PLENARY SESSIONS 1 to 8Informa
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SCRS PLENARY SESSIONS 1 to 8The Com
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EXECUTIVE SUMMARY YFTavailable catc
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EXECUTIVE SUMMARY YFTYFT-6. Managem
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1983 1984 1985 1986 1987 1988 1989
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EXECUTIVE SUMMARY YFT250000YFT. Tas
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EXECUTIVE SUMMARY YFT6050BBLLothPS4
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EXECUTIVE SUMMARY YFTYFT-Figure 9.
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EXECUTIVE SUMMARY YFTYFT-Figure 13.
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EXECUTIVE SUMMARY BETthe West Atlan
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EXECUTIVE SUMMARY BETbe encouraged,
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ICCAT REPORT 2008-2009 (I)BET-Figur
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ICCAT REPORT 2008-2009 (I)BET-Figur
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EXECUTIVE SUMMARY SKJcatches, suppo
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Page 62 and 63: ALB-Table 1. Estimated catches (t)
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Page 72 and 73: ICCAT REPORT 2008-2009 (I)Spawning
Page 74 and 75: EXECUTIVE SUMMARY BFT8.5 BFT - ATLA
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Page 92 and 93: EXECUTIVE SUMMARY BFTNumber of year
Page 94 and 95: EXECUTIVE SUMMARY BUM/WHM8.6 BLUE M
Page 98 and 99: BUM-Table 1. Estimated catches (t)
Page 100 and 101: WHM-Table 1. Estimated catches (t)
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EXECUTIVE SUMMARY SHKparameters), a
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SHK-Table 1. Estimated catches (t)
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EXECUTIVE SUMMARY SHKSHK-Figure 1.
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EXECUTIVE SUMMARY SHKSHK-Figure 4.
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SCRS PLENARY SESSIONS 9 to 17includ
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SCRS PLENARY SESSIONS 9 to 179.9 Sh
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SCRS PLENARY SESSIONS 9 to 1713.1 A
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SCRS PLENARY SESSIONSBrazil informe
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SCRS PLENARY SESSIONS−−−Effor
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SCRS PLENARY SESSIONSData deficienc
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SCRS PLENARY SESSIONS15.5 Other con
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SCRS PLENARY SESSIONS16.5 Profile f
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PARTICIPANTSAppendix 2LIST OF PARTI
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PARTICIPANTSDe Bruyn, Paul*AZTI - T
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PARTICIPANTSKOREAHwang, Seon-JaeNat
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PARTICIPANTSURUGUAYDomingo, Andrés
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PARTICIPANTSICCAT SECRETARIATC/ Cor
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LIST OF DOCUMENTSSCRS/2008/033Analy
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LIST OF DOCUMENTSSCRS/2008/071SCRS/
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LIST OF DOCUMENTSSCRS/2008/109Estan
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LIST OF DOCUMENTSSCRS/2008/143 Dist
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LIST OF DOCUMENTSSCRS/2008/179Preli
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OPENING ADDRESSOPENING ADDRESS OF D
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WORK PLANS FOR 2009Before the asses
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WORK PLANS FOR 2009− The estimati
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WORK PLANS FOR 2009Sharks Work Plan
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BYP ACTIVITIESFor the 2007-2008 per
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BYP ACTIVITIES4.2 The MIGRATUN proj
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BILLFISH RESEARCH PROGRAMthe contin
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BILLFISH RESEARCH PROGRAMTable 1. S
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SUB-COM STATISTICSREPORT OF THE 200
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SUB-COM STATISTICS3.2.2 Revision of
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SUB-COM STATISTICS5.2 Responses to
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SUB-COM STATISTICSwill soon be prov
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SubCom Stats Report Table 1. Report
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SUB-COM STATISTICSAddendum 1 to App
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SUB-COM STATISTICSHarmonization of
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SUB-COM STATISTICSFor by-catch in g
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SUB-COM STATISTICS9. Other recommen
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SUB-COM ECOSYSTEMSwaters, it shows
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SUB-COM ECOSYSTEMSprioritize future
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Uruguay Uruguay PelagicLonglineCana
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SUB-COM ECOSYSTEMSReverse side229
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EXAMPLE FORMS: TASK II INFOAPPENDIX
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EXAMPLE FORMS: TASK II INFOPROGRAMA
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EXAMPLE FORMS: TASK II INFOPrograma
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BY-CATCH COORD. PROFILEAppendix 11I
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