Pre-assessment Final Report

Transcription

1 Scoping study of the OPAGAC/AGAC tropical tuna purse seine Fishery against the MSC Fishery Assessment Standards to develop a Fishery Improvement Project Prepared for: OPAGAC/AGAC and WWF Spain Pre-assessment Final Report 15/10/2014 Submitted by

2 MRAG Ltd is an independent fisheries and aquatic resource consulting company dedicated to the sustainable use of natural resources through sound, integrated management practices and policies. Established in 1986, MRAG has successfully completed projects in more than 60 countries. Our in-house experts have a wide variety of technical expertise and practical experience across all aspects of aquatic resource management, policy and planning, allowing us to take a multi-disciplinary approach to every project. Our capability to service an extensive array of resource management needs is further extended through our network of associations with internationally acclaimed experts in academic institutions and private organisations worldwide. MRAG Ltd 18 Queen Street London W1J 5PN United Kingdom T: +44 (0) F: +44 (0) W: E: enquiry@mrag.co.uk Project code: ES1909 Version: FINAL; 15 th October 2014 Prepared by: LN, JP, RW Approved by: RW

3 Acronyms B MSY CMM CITES ERA ETP EU Fcurrent F MSY FAD HCR IATTC ICCAT IOTC ISSF LRP MSC PI RFMO RPOA SSB MSY TAC TRP VMS WCPFC Total stock biomass at which Maximum Sustainable Yield is realised Conservation and Management Measures Convention on International Trade in Endangered Species of Wild Fauna and Flora Ecological Risk Assessment Endangered, Threatened or Protected species European Union Instantaneous rate of fishing mortality in current year Instantaneous rate of fishing mortality producing the maximum sustainable yield Fish Aggregating Device Harvest Control Rule Inter-American Tropical Tuna Commission International Commission for the Conservation of Atlantic Tunas Indian Ocean Tuna Commission International Seafood Sustainability Foundation Limit reference point Marine Stewardship Council Performance Indicator under MSC programme Regional Fisheries Management Organisation Regional Plan of Action Spawning stock biomass at which Maximum Sustainable Yield is realised Total Allowable Catch Target reference point Vessel Monitoring System Western and Central Pacific Fisheries Commission MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page i

4 Acknowledgements The authors are grateful for the constructive comments and feedback received from Dr. Paul Medley (Principle 1), Dr. Martin Hall (Principle 2) and Dr. Victor Restrepo (Principle 3). MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page ii

5 Contents Introduction... 1 Summary of results Principle Atlantic Ocean... 5 Atlantic yellowfin Management Outcomes Harvest Strategy (Management)... 8 Atlantic Bigeye Management Outcomes Harvest Strategy (Management) Western Atlantic Skipjack Management Outcomes Harvest Strategy (Management) Eastern Atlantic Skipjack Management Outcomes Harvest Strategy (Management) Indian Ocean Indian Ocean Bigeye Management Outcomes Harvest Strategy (Management) Indian Ocean Skipjack Management Outcomes Harvest Strategy (Management) Indian Ocean Yellowfin Management Outcomes Harvest Strategy (Management) Pacific Ocean Eastern Pacific Bigeye Management Outcomes Harvest Strategy (Management) Eastern Pacific Yellowfin Management Outcomes Harvest Strategy (Management) Eastern Pacific Skipjack Management Outcomes Harvest Strategy (Management) MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page iii

6 Western Pacific Bigeye Management Outcomes Strategy (Management) Western Pacific Skipjack Management Outcomes Harvest Strategy (Management) Western Pacific Yellowfin Management Outcomes Harvest Strategy (Management) Summary Principle Retained Species Bycatch Species Endangered, Threatened and Endangered (ETP) Species Habitats Ecosystem Summary Principle Indian Ocean Tuna Commission Governance and Policy Fishery-specific Management System Inter-American Tropical Tuna Commission Governance and Policy Fishery-specific Management System International Commission for the Conservation of Atlantic Tunas Governance and Policy Fishery-specific Management System Western and Central Pacific Fishery Commission Governance and Policy Fishery-specific Management System Summary References MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page iv

7 Introduction This document presents information collected as part of a pre-assessment conducted on the OPAGAC/AGAC (hereafter referred to as OPAGAC) tropical tuna fisheries against the current MSC certification requirements (v 1.3). The certification requirements are divided into three Principles which each deal with different aspects of the fishery. Principle 1 focuses on the stock status of the target species in relation to biological reference points, the harvest strategies and harvest control rules applied to the stock, the availability of information on the stock and the monitoring conducted. Principle 2 assesses with fishery-specific impacts of the fishery on the environment, which includes the status, management strategy, and availability of information and monitoring conducted on any other retained species, bycatch species, Endangered, Threatened and Protected (ETP) species, the habitat and the wider ecosystem. Finally, Principle 3 focuses on both the broad governance and legislation issues and fishery specific management systems related to the fishery. Principle 3 also specifically considers the role of Regional Fisheries Management Organisations (RFMOs). The OPAGAC fleet operates in the Atlantic, Indian and Pacific Oceans and targets yellowfin, bigeye and skipjack tuna using purse seine gear. Purse seines are set on both free schools of tuna as well as schools surrounding Fish Aggregating Devices (FADs) and natural logs. The majority of catches made by the OPAGAC fleet are taken using FADs. The Unit of Certification (UoC) is the unit that is assessed by certifiers against the MSC environmental Standard. The unit is defined as the geographic distribution of the target stock(s), combined with the fishing method/gear and practice (including vessel/s) pursuing that stock and management system. Within this assessment, the UoC is defined as: Geographic location Species Gear Management System Fleet Atlantic Ocean Indian Ocean Pacific Ocean Skipjack tuna (Katsuwonus pelamis); Yellowfin tuna (Thunnus albacares); Bigeye tuna (Thunnus obesus) Purse seine utilizing: Free school Fish Aggregating Devices (FADs) Natural log European Union (CFP) IATTC ICCAT IOTC WCPFC Vessels under OPAGAC/AGAC An assessment of the fishery under Principles 1 and 3 has been adapted from Powers and Medley (2013), and updated where appropriate. For example, information specific to MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 1

8 OPAGAC s fleet was assessed and included in the evaluation. In addition, a data request was put forward to an RFMO to obtain specific information under Principle 2 on the level of other retained and bycatch species taken by OPAGAC vessels. However, this primary data was not available to the evaluation team. Instead, it is planned that these national data will be analysed separately by AZTI, following a formal request to the IEO. This assessment used data and information from peer reviewed papers and technical reports. Where possible, data were selected for EU fisheries (including Spain) to make generalisations about the likely impacts of the fisheries but specific data were not available for the Spanish fleets at this time. As noted below under Performance Indicator 2.1.1, the data available on levels of bycatch were not always clear on the fate of the bycatch (i.e. whether it was retained or discarded). These scores should therefore be updated based on data from OPAGAC s fleet. OPAGAC provided a number of documents to the evaluation team including: i. A protocol between AGAC s fleets and the Spanish Fisheries Administration; ii. Details of the whale shark tagging project being undertaken by one of OPAGAC s fleets; iii. A set of mandatory standards for crew members to abide by onboard the vessels of one of OPAGAC s fleets; iv. A job description for a position at AZTI to review of codes of good practices for purse seine vessels including the extraction of OPAGAC specific fleet data; v. The Spanish FAD management plan; vi. Good practices to reduce the mortality of sharks and rays caught incidentally by tropical tuna purse seiners; vii. ISSF Skipper training guidelines; viii. Responsible fishing plan for one of OPAGAC s fleets; ix. A study on the use of electronic monitoring systems in tropical tuna purse seine fisheries; x. A report on preliminary data from FAD management plans in the Atlantic Ocean. MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 2

9 Summary of results The following tables provide an overall summary of the likely scores awarded to the OPAGAC purse seine fleet. The rationale behind the scoring for each Performance Indicator is provided in the main body of the report. An average score of 80 and above for each Principle is expected to meet the MSC Standard. Atlantic Ocean Pacific Ocean Indian Ocean P1 YFT BET W SKJ E SKJ W YFT W BET W SKJ E YFT E BET E SKJ YFT BET SKJ Component PI No. Performance indicator (PI) Outcome Stock status < Reference Points Stock rebuilding 75 <60 Management Harvest strategy Harvest control rules & tools Information and monitoring Assessment of stock status Weighted Principle level scores Stock rebuilding required? Yes No No No No Yes No No No No No No No P1 Score: P2 Component PI No. Performance indicator (PI) Score Retained species Outcome Management Information and monitoring 90 Management Outcome Management Information and monitoring 80 ETP species Outcome Management Information and monitoring 85 Habitats Outcome Management Information and monitoring 95 Ecosystems Outcome Management Information and monitoring 90 Weighted Principle level scores P2 Score: 85.7 MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 3

10 Atlantic Pacific Indian P3 ICCAT WCPFC IATTC IOTC Component PI No. Performance indicator (PI) Score Score Score Score Governance and Policy Fisheries specific management system Legal & customary framework Consultation, roles & responsibilities Long Term Objectives Incentives for Sustainable Fishing Fishery Specific Objectives Decision making Processes Compliance and Enforcement Research Plan Management Performance Evaluation Weighted Principle level scores P3 Score: MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 4

11 1 Principle 1 This analysis was carried out as part of an independent study originally conducted by Powers and Medley (2013) and has been updated where necessary. The majority of the target stocks have had new stock assessments or been updated since this previous analysis was conducted, with the exception of bigeye and yellowfin tuna in the Atlantic Ocean. Atlantic Ocean Atlantic yellowfin 1.1 Management Outcomes Stock Status: The stock is at a level which maintains high productivity and has a low probability of recruitment overfishing a Stock Status It is likely that the stock is It is highly likely that the stock above the point where is above the point where recruitment would be impaired. recruitment would be impaired. There is a high degree of certainty that the stock is above the point where recruitment would be impaired b Stock status in relation to target reference point The stock is at or fluctuating around its target reference point. There is a high degree of certainty that the stock has been fluctuating around its target reference point, or has been above its target reference point, over recent years. The most recent stock assessment carried out in 2011 estimated that the stock biomass is approximately 85% of the B MSY level, which is highly likely to be above the point where recruitment would be impaired the default value for this being around 50% of the B MSY level (ISSF, 2014). This level also suggests, however, that the stock is overfished (ICCAT, 2012). This assessment considered catch, size and effort since the 1950s, and estimated that the fishing mortality rate was about 87% of F MSY which suggests that the stock is not undergoing overfishing (ICCAT, 2012). Therefore, the stock as of 2010 was rebuilding to take it back to the target level (above MSY), although the stock status was determined to be lower than the previous assessment in Since the last stock assessment, the total catch has remained below the estimated MSY ( t), varying between t in 2007 up to 101,400t in 2012 (ISSF, 2014). In theory, the stock size is likely to be increasing, but this would need to be confirmed through on-going monitoring. All SG60 and 1 out of 2 SG80 are met. Score 1.1.1: 70 ICCAT, 2008a ICCAT, 2011a ICCAT 2011b ICCAT, 2012 ISSF, 2014 MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 5

12 1.1.2 Reference Points: Limit and target reference points are appropriate for the stock a Appropriateness of reference points Generic limit and target Reference points are reference points are based on appropriate for the stock and justifiable and reasonable can be estimated. practice appropriate for the species category b Level of limit reference point The limit reference point is set above the level at which there is an appreciable risk of impairing reproductive capacity. The limit reference point is set above the level at which there is an appreciable risk of impairing reproductive capacity following consideration of relevant precautionary issues c Level of target reference point The target reference point is such that the stock is maintained at a level consistent with B MSY or some measure or surrogate with similar intent or outcome. The target reference point is such that the stock is maintained at a level consistent with B MSY or some measure or surrogate with similar intent or outcome, or a higher level, and takes into account relevant precautionary issues such as the ecological role of the stock with a high degree of certainty. The reference points are estimated based on MSY and appropriate for tuna stocks. MSY is estimated as part of the stock assessment and will depend in part on the selectivity of the fishery. The estimate will depend upon the stock assessment model used. Two basic stock assessments were used for yellowfin: age structured VPA and a logistic production model. VPA tended to give a more skewed estimate of MSY at lower biomass levels than the logistic model, but also estimated the maximum sustainable yield at a lower value. The B MSY estimates were combined from these models to form a single probability for B MSY which was used to provide management advice. Combining the estimates in this way should provide a reasonably precautionary indication of the state of the stock. There is no specific limit point accepted by the management authority. The trigger point (MSY) is set above the level at which there is an appreciable risk of impairing reproductive capacity and therefore there is an implied limit below this point. The default 50% BMSY is assumed here for purposes of defining stock status. However, the lack of a well-defined point indicates that the SG80 is not met. The intention implied by the scientific advice and management response is to maintain the stock at or above the MSY level. Therefore, although no target reference point is defined, the target region is effectively defined as the biomass just above the MSY level, which meets the SG80. A more precise definition justified through scientific analysis and research would be necessary before the SG100 could be met. For example, no guidance is available on how far above B MSY the stock should be maintained, based on acceptable risk for example. Neither is there any reference to the ecological role of the stock. The scoring issue related to low trophic species (for low trophic level species, the target reference point takes into account the ecological role of the stock.) is not considered for tuna because it is not a low trophic level species. All SG60 and 2 out of 3 SG80 are met. Score 1.1.2: 75 ICCAT, 2008a ICCAT, 2011 MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 6

13 Restrepo, Stock Rebuilding: Where the stock is depleted, there is evidence of stock rebuilding a Rebuilding strategy design Where stocks are depleted rebuilding strategies which have a reasonable expectation of success are in place. Where stocks are depleted, strategies are demonstrated to be rebuilding stocks continuously and there is strong evidence that rebuilding will be complete within the specified timeframe b Rebuilding timeframes A rebuilding timeframe is A rebuilding timeframe is specified for the depleted stock is the shorter of 30 years or 3 times its generation time. For cases where 3 generations is specified for the depleted stock that is the shorter of 20 years or 2 times its generation time. For cases where 2 generations less than 5 years, the rebuilding is less than 5 years, the timeframe is up to 5 years. rebuilding timeframe is up to 5 years. The shortest practicable rebuilding timeframe is specified which does not exceed one generation time for the depleted stock c Rebuilding evaluation Monitoring is in place to determine whether the rebuilding strategies are effective in rebuilding the stock within a specified timeframe. There is evidence that the rebuilding strategies are rebuilding stocks, or it is highly likely based on simulation modelling or previous performance that they will be able to rebuild the stock within a specified timeframe. The stock is depleted (defined as the biomass below the MSY level) and a strategy is being applied. The main constraint on fishing operations is the requirement to reduce fisheries targeting bigeye tuna. Yellowfin is caught alongside bigeye both in the surface fisheries (smaller, younger bigeye and yellowfin) and longline. There is no TAC in place to limit catches of yellowfin, but a TAC on bigeye tuna will effectively limit fishing effort on yellowfin. Limiting fishing mortality to a level which will allow recovery of bigeye should also allow recovery of yellowfin. Based on the simulation modelling and at the current levels of catch, the stock should rebuild by 2016 (>60% probability as long as catches are 110,000 tonnes or below). The recent reduction in yellowfin catches from the 2001 high and subsequent recovery of yellowfin stock to just below the MSY reference point would suggest that the current strategy should be working, although it is primarily directed at bigeye tuna. Therefore, the current approach seems at least adequate, given the level of monitoring. The attempts to reduce small bigeye tuna catches are considered in PI Catches have demonstrably remained below the MSY estimate, and below the catch required to rebuild the stock above B MSY based on the projection. Catches have remained well below t, which suggests the stock should have risen above B MSY since This was based on a model projection, but was not confirmed through the most recent stock assessment. The stock recovery is not strongly supported by the available abundance indices, and there is no clearly defined time frame, so the SG100 is not met. No rebuilding time frame is specified by the management authority, but projections by scientists run from 2011 to As a result, it is assumed that rebuilding is specified to be 10 years or less. Based on age at first maturity the generation time should be between 5-10 years. Assuming t catch or less, the projections indicated that the stock should rebuild (> B MSY ) by 2020 with a probability exceeding 70%. This meets the SG80. There is no evidence that the catch is being limited so that the shortest practicable rebuilding time MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 7

14 frame would be reached. As indicated in PI 1.2.1, yellowfin recovery is dependent on the harvest strategy to protect bigeye, so the SG100 is not met. Based on a previous assessment in 2007, the projection beyond 2008 would be highly likely to lead to stock size rising above B MSY by 2011, effectively 3 years after the rebuilding would begin. This was mostly driven by catches significantly lower than some in the time series which led to the stock depletion. However, this projection was not supported by 2011 stock assessment and the recovery, if any, is not confirmed by the available abundance indices. Therefore, while monitoring is in place meeting the SG60, it has not yet provided evidence that the stock are rebuilding, suggesting rebuilding is not occurring or is too slow to detect. All SG60 and 2 out of 3 SG80 are met. (Score 1.1.3: 75) ICCAT, 2011a ICCAT, 2011b 1.2 Harvest Strategy (Management) Harvest Strategy: There is a robust and precautionary harvest strategy in place a Harvest strategy design The harvest strategy is The harvest strategy is expected to achieve stock responsive to the state of the management objectives stock and the elements of the reflected in the target and limit reference points. harvest strategy work together towards achieving management objectives reflected in the target The harvest strategy is responsive to the state of the stock and is designed to achieve stock management objectives reflected in the target and limit reference points. and limit reference points b Harvest strategy evaluation The harvest strategy is likely to work based on prior experience or plausible argument. The harvest strategy may not have been fully tested but monitoring is in place and evidence exists that it is achieving its objectives. The performance of the harvest strategy has been fully evaluated and evidence exists to show that it is achieving its objectives including being clearly able to maintain stocks at target levels c Harvest strategy monitoring Monitoring is in place that is expected to determine whether the harvest strategy is working d Harvest strategy review The harvest strategy is periodically reviewed and improved as necessary. ICCAT s objective is embedded in the preamble of its Convention finalized in The preamble states: The Governments ( ) considering their mutual interest in the populations of tuna and tunalike fishes found in the Atlantic Ocean, and desiring to cooperate in maintaining the populations of these fishes at levels which will permit the maximum sustainable catch for food and other purposes. ICCAT s objective is therefore to maintain populations of tunas and tuna-like fishes at levels that will permit maximum sustainable yield (MSY). ICCAT, being a regional organization, provides a forum where the various countries exploiting tunas can work together to implement the strategy to meet this objective. MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 8

15 The current strategy is to limit catches to sustainable levels based on a feedback process implemented by the Commission and to reduce bycatch of small bigeye tunas. Scientific advice is provided and a TAC with a seasonal closed area agreed through this process, which therefore also includes evaluation of, and adaptation to, changing circumstance. The external review panel found that the objectives of ICCAT appeared to be met for 4 of the 14 stocks examined (29%), which included bigeye and yellowfin tuna. However, changes were made to the seasonal closure without reference to scientific advice, rendering this management action less effective. This has since 2008 been corrected, but the designed aspect of the strategy to change overall selectivity can only be given limited credit. A more finely tuned strategy may be difficult to design due to the relatively blunt nature of international controls. For yellowfin, the strategy depends on the relative selectivity of the different fishing methods between yellowfin and bigeye tunas. While multispecies aspects of the catches have been explored in various analyses, there is no cohesive designed strategy to jointly manage and monitor the stocks. The reliance is on responding to detected problems rather than designing an approach to optimize the fisheries across the various stocks. Therefore, a responsive harvest strategy has been developed that appears to be succeeding in achieving target stock levels, meeting the SG80. However, the strategy being partly a side-effect of bigeye management and being relatively imprecise cannot be considered designed and therefore does not meet the SG100. In the case of the yellowfin stock, the fishing mortality is constrained by controls primarily intended to limit fishing mortality on bigeye tuna. The assessment showed that the yellowfin stock is overfished or fully exploited, but model projections indicated that catches, at about the 2006 level, will recover the stock to above the MSY level. The approach to management appears somewhat ponderous and evidence that it will continue to work is limited, preventing a higher score. The system requires re-evaluation and resetting the TAC through Commission recommendations which must be accepted by the contracting parties on each occasion. There is no pre-agreement on how to react to stock changes (picked up by PI below) and stock assessments required to evaluate management performance are not frequent given the stock is heavily exploited. A stock assessment was undertaken for bigeye in The last stock assessment for yellowfin was conducted in 2011 and an update will be conducted in Monitoring is in place and the available evidence indicates that the harvest strategy should achieve its objectives, meeting the SG80. However, there has been no recent evaluation of the stock status to confirm the current expectations, and more broadly, the harvest strategy has only been considered in fairly narrow terms (total catch) and has not yet considered wider context of the fishery, so the SG100 is not met. Monitoring is adequate to determine whether the harvest strategy is working. The different parts of the strategy include increasing the mean size and holding catches at around current level or lower. Data are collected to estimate these quantities. Also the stock assessment reports best estimates of biomass, which indicates whether management is achieving its objectives or not. The harvest strategy is reasonable, however, there is inadequate information available to indicate what improvements might be possible. Therefore, the fishery clearly meets the SG60. There is no evidence of any formal review of the harvest strategy therefore the fishery does not meet the SG100. Scoring issue e from v1.3 of the MSC certification requirements has not been included as sharks are not the target species. All SG60 and SG80, but no SG100, are met. Score 1.2.1: 80 ICCAT, 2007 ICCAT, 2009 ICCAT, 2011a ICCAT, 2011b ICCAT, 2011c Restrepo, 2009 MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 9

16 1.2.2 Harvest control rules and tools: There are well defined and effective harvest control rules in place a Harvest control rules, design and application Well defined harvest control rules are in place that are consistent with the harvest strategy and ensure that the exploitation rate is reduced as limit reference points are approached. Generally understood harvest control rules are in place that are consistent with the harvest strategy and which act to reduce the exploitation rate as limit reference points are approached b Harvest control rules account for uncertainty The selection of the harvest control rules takes into account the main uncertainties. The design of the harvest control rules take into account a wide range of uncertainties c Harvest control rules evaluation There is some evidence that Available evidence indicates tools used to implement harvest that the tools in use are control rules are appropriate appropriate and effective in and effective in controlling achieving the exploitation levels exploitation. required under the harvest control rules. Evidence clearly shows that the tools in use are effective in achieving the exploitation levels required under the harvest control rules. There is no well-defined harvest control rule and therefore there is no specific plan of control if the stock size falls below the trigger point (MSY). There is clear evidence of intention to reduce harvest in the face of depletion and the scientific advice indicated that the current level of control was adequate for a recovery of the stock to above the MSY level and that no additional action is required. However, this is not well-defined and it is not clear how levels of yellowfin catch relate to the target catch for bigeye or what would be done if a higher fishing mortality could be directed at yellowfin. The fact that appropriate action would be taken if the stock came under increased pressure is presumed, but not assured. It is not possible to evaluate the harvest control in relation to uncertainties, because it has not been defined well enough to do so. The current level of control, mainly through limits on fishing capacity and a bigeye tuna catch limit, has resulted in sustainable catch levels for yellowfin tuna. In 1993, the Commission recommended that there be no increase in the level of effective fishing effort exerted on Atlantic yellowfin tuna, over the level observed in As measured by fishing mortality estimates from the 2008 stock assessment, effective effort in 2006 appeared to be well below (about 25-30% below) the 1992 levels, and there has been a declining trend in recent years. Individual countries apply quota controls on their own and foreign fleets for TAC which limits effective fishing effort on yellowfin in the surface and longline fisheries. If the current level of yellowfin catch continues, the stock should increase in size and the fishery objectives should be met. The tools appear to have been effective in controlling exploitation, meeting the SG60. This evidence is limited, however, since it is not clear how much this is a result of the side effect of controls on bigeye tuna. If catches of bigeye rises to the current TAC level, it is not clear that yellowfin catches would still maintain the biomass at the target level. Therefore, the SG80 is not met. All SG60, but no SG80, are met Score 1.2.2: 60 ICCAT, 2008a ICCAT, 2009 ICCAT, 2011a MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 10

17 1.2.3 Information / monitoring: Relevant information is collected to support the harvest strategy a Range of information Sufficient relevant information related to stock structure, stock productivity, fleet composition and other data are available to support the harvest strategy. Some relevant information related to stock structure, stock productivity and fleet composition is available to support the harvest strategy. A comprehensive range of information (on stock structure, stock productivity, fleet composition, stock abundance, fishery removals and other information such as environmental information), including some that may not be directly relevant to the current harvest strategy, is available b Monitoring Stock abundance and fishery removals are monitored and at least one indicator is available and monitored with sufficient frequency to support the harvest control rule. Stock abundance and fishery removals are regularly monitored at a level of accuracy and coverage consistent with the harvest control rule, and one or more indicators are available and monitored with sufficient frequency to support the harvest control rule. All information required by the harvest control rule is monitored with high frequency and a high degree of certainty, and there is a good understanding of the inherent uncertainties in the information [data] and the robustness of assessment and management to this uncertainty c Comprehensiveness of information There is good information on all other fishery removals from the stock. Although data have been generally poor and ICCAT has had considerable problems in maintaining accurate data in its database, there have been significant improvements over time. For yellowfin tuna, the data were sufficient for a stock assessment with several approaches possible. There was adequate information on stock structure, productivity and the fishing fleets to allow a full stock assessment to be completed. There is evidence that on-going research is planned to improve information and therefore the stock assessment. This suggests that on-going development of data collection is adequate to detect and remove problems over time. The working group has recommended studies on fecundity and maturity and a tagging program, although these have not been directed at yellowfin. Various scientific studies using available data are regularly presented at ICCAT scientific meetings. Sources of errors in data collection are being investigated, leading to further directed research to reduce them. While information is sufficient, meeting the SG80, it is not comprehensive. There is considerable environmental data not directly used in the current harvest strategy, but various data on age and abundance are limited and understanding of the population dynamics is incomplete compared to other stocks. These gaps are recognized and, although there have been improvements, the Working Group indicated a need to increase biological studies of yellowfin. With significant gaps, the fisheries cannot meet the SG100. Monitoring indices are adequate for the current harvest control rule. Indicators of stock abundance mainly consist of standardized catch-per-unit-effort indices. Given the large areas of ocean and dispersal of the species, dedicated surveys are not an option for this type of fishery. Two abundance indices are available for the entire time series covering the majority range of the stock. The Japanese and Chinese Taipei s longline indices account for the longest time series and majority of the catch. The external review panel recommended, among other things, that efforts continue to be made to improve the timeliness and accuracy of fisheries data. This accuracy and coverage of the monitoring program is adequate for the limited current harvest control rule (see PI 1.2.2), and available indicators would also support better defined rules based on fishing mortality and biomass estimates. Therefore, the fisheries meet the SG80. The monitoring does MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 11

18 not cover all information, and not all information from all fleets is recorded with a high degree of certainty. Uncertainties are known to occur from many sources, but their precise nature is also not known. For example, landings rejected by canneries and sold in local West African markets ( faux poisson ) since 1980s consist of many species and sizes, and yellowfin tuna sold this way can only be estimated approximately. Therefore the fisheries do not meet the SG100. ICCAT has put considerable effort in getting countries to record and report catches. The current level of reporting is far from perfect given the number of small countries involved and difficulties in monitoring small vessels and activities in oceanic waters well away from the coast. This illustrates the on-going problems ICCAT faces with the contracting parties. Nevertheless, catches are recorded increasingly well with decreasing IUU fishing activity, and data are sufficiently well recorded for the stock assessment and for assessing the level of control sought by ICCAT over landed catches. OPAGAC vessels in the Atlantic Ocean have 100% observer coverage and are also moving towards the use of electronic monitoring which can both be used to monitor catch and bycatch onboard vessels. This meets the SG80. Note that this is in contrast to the Mediterranean fisheries, where information provision to ICCAT appears currently inadequate. All SG60 and SG80, but no SG100, are met. Score 1.2.3: 80 ICCAT, 2008a ICCAT, 2009 ICCAT, 2011b Assessment of stock status: There is an adequate assessment of the stock status a Appropriateness of assessment to stock under consideration The assessment is appropriate for the stock and for the harvest control rule. The assessment takes into account the major features relevant to the biology of the species and the nature of the fishery b Assessment approach The assessment estimates stock status relative to reference points c Uncertainty in assessment The assessment identifies major sources of uncertainty. The assessment takes uncertainty into account. The assessment takes into account uncertainty and is evaluating stock status relative to reference points in a probabilistic way d Evaluation of assessment The assessment has been tested and shown to be robust. Alternative hypotheses and assessment approaches have been rigorously explored e Peer review of assessment The assessment of stock status is subject to peer review. The assessment has been internally and externally peer reviewed. MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 12

19 Various stock assessment models and software are applied. All methods and model structures are generic, but are structured to take advantage of the available data. Available software includes a variety of methods also used in other tuna fisheries and for other national stocks (including stock synthesis, VPA, production models, Multifan-CL and Bayesian biomass dynamics models). The main advice is obtained from a relatively simple, but robust, virtual population analysis model and a production model, which makes use of the estimated catch-at-age. The stock assessment has not been carried out frequently, considering the stock is rebuilding from below the MSY level. However, this frequency is still consistent with the current harvest control rule. The assessment attempts to account for some features of the species biology and the fishery, but the approach remains broadly generic, meeting the SG80, but not the SG100. Uncertainty varies among different data sources, but these are treated in much the same way in the assessment. Also, improved information on the biology from, for example, tagging studies, could lead to an improved assessment meeting the SG100. The stock assessment can be used to estimate the MSY reference point, and this is used to determine stock status. Although the assessments undertaken include fully stochastic (Bayesian) and sampling simulation or bootstrap methods, these results are reported along with other assessment approaches, also accounting for structural errors in this assessment. The working group was unable to choose between two structures for the catch-at-age model used for management advice, and therefore combined the estimates from both together with results from a production model. Point estimates are combined from stochastic simulations of the selected models to represent final density functions for the values of interest. This takes account of uncertainty and treats the results in a probabilistic way, meeting the SG100. Alternative software has been applied to the available data, although this falls short of a rigorous exploration of alternative hypotheses and approaches to assessment. An age-structured population (VPA) and production model are being used as the main source of management advice. The VPA has been fitted with many different configurations in terms of data used and assumptions made in the model. The other assessment methods are used to provide indications of uncertainty by providing a range of possible results. There are recommendations to continue work on developing improved statistical models. Overall, the stock assessment has not been tested against many alternative hypotheses, so whether it is robust is not clear. This does not meet the SG100. The stock assessment is subject to review through a working group process. SCRS meet annually and review models, data and research on the main tuna species, as well as other species within ICCAT jurisdiction. Although external review of the management system has taken place, there is no external technical review of the stock assessments. The SG80 is met, but without external review the SG100 is not. All SG60 and SG80, and 1 out of 4 SG100, are met. Score 1.2.4: 85 ICCAT, 2008a ICCAT, 2011a ICCAT, 2011b MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 13

20 Atlantic Bigeye 1.1 Management Outcomes Stock Status: The stock is at a level which maintains high productivity and has a low probability of recruitment overfishing a Stock Status It is likely that the stock is It is highly likely that the stock above the point where is above the point where recruitment would be impaired. recruitment would be impaired. There is a high degree of certainty that the stock is above the point where recruitment would be impaired b Stock status in relation to target reference point The stock is at or fluctuating around its target reference point. There is a high degree of certainty that the stock has been fluctuating around its target reference point, or has been above its target reference point, over recent years. The most recent stock assessment (2010) estimated that the stock biomass is approximately 101% of the B MSY level in 2009, which is highly likely to be above the point where recruitment would be impaired the default value for this being around 50% of the B MSY level (ISSF, 2014). This also indicates that overfishing is not occurring. This meets the SG80, however it does not meet the SG100 as there is considerable uncertainty as to where recruitment would be impaired and the point estimate of current biomass is not high enough (i.e. not above the MSY level) to meet the SG100. Based on the most recent assessment which considers catch, size and effort since the 1950s, it is likely that the stock is around the maximum sustainable yield (MSY) level in 2009, while fishing mortality rate is about 95% of F MSY. Catches are currently at an appropriate level to allow the stock to continue to rise above the MSY level as they are lower than the calculated MSY of 92,000 tonnes (catch of 70,500 tonnes in 2012) (ICCAT, 2013). The stock has only recently recovered to the MSY level, and was recently below it. The stock will only meet the SG100 if it continues to rise and remains close to or above the MSY level for the next five years. All SG60 and SG80, but no SG100, are met. Score 1.1.1: 80 FCI, 2010 ICCAT, 2008b ICCAT, 2009 ICCAT, 2010a ICCAT, 2011c ICCAT, 2013 MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 14

21 1.1.2 Reference Points: Limit and target reference points are appropriate for the stock a Appropriateness of reference points Reference points are appropriate for the stock and can be estimated. Generic limit and target reference points are based on justifiable and reasonable practice appropriate for the species category b Level of limit reference point The limit reference point is set above the level at which there is an appreciable risk of impairing reproductive capacity. The limit reference point is set above the level at which there is an appreciable risk of impairing reproductive capacity following consideration of relevant precautionary issues c Level of target reference point The target reference point is such that the stock is maintained at a level consistent with B MSY or some measure or surrogate with similar intent or outcome. The target reference point is such that the stock is maintained at a level consistent with B MSY or some measure or surrogate with similar intent or outcome, or a higher level, and takes into account relevant precautionary issues such as the ecological role of the stock with a high degree of certainty. The reference points are estimated based on MSY and are appropriate for tuna stocks. MSY is estimated as part of the stock assessment and reported within the management system. The relation of the stock relative to MSY is reported as part of the determination of stock status. Although there is no specific limit point, there is a limit region defined below the trigger reference point. The trigger is set above the level at which there is an appreciable risk of impairing reproductive capacity and therefore there is an implied limit below this point. The default 50% B MSY is assumed here for purposes of defining stock status. However, the lack of a well-defined point indicates that the 80 guidepost is not met. The intention implied by the scientific advice and management response is to maintain the stock at or above the MSY level. Therefore, although no target reference point is defined, the target region is effectively defined as the biomass above the MSY level. This meets the SG80. However, a more precise definition justified through scientific analysis and research would be necessary before the higher guidepost could be met. All SG60 and 2 out of 3 SG80. Score 1.1.2: 75 ICCAT, 2008b ICCAT, 2010a Restrepo, 2009 MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 15

22 1.1.3 Stock Rebuilding: Where the stock is depleted, there is evidence of stock rebuilding. Because the stock is not considered as depleted, this performance indicator is not scored. 1.2 Harvest Strategy (Management) Harvest Strategy: There is a robust and precautionary harvest strategy in place a Harvest strategy design The harvest strategy is The harvest strategy is expected to achieve stock responsive to the state of the management objectives stock and the elements of the reflected in the target and limit reference points. harvest strategy work together towards achieving management objectives reflected in the target The harvest strategy is responsive to the state of the stock and is designed to achieve stock management objectives reflected in the target and limit reference points. and limit reference points b Harvest strategy evaluation The harvest strategy is likely to work based on prior experience or plausible argument. The harvest strategy may not have been fully tested but monitoring is in place and evidence exists that it is achieving its objectives. The performance of the harvest strategy has been fully evaluated and evidence exists to show that it is achieving its objectives including being clearly able to maintain stocks at target levels c Harvest strategy monitoring Monitoring is in place that is expected to determine whether the harvest strategy is working d Harvest strategy review The harvest strategy is periodically reviewed and improved as necessary. ICCAT s objective is embedded in the preamble of its Convention finalised in The preamble states: The Governments ( ) considering their mutual interest in the populations of tuna and tunalike fishes found in the Atlantic ocean, and desiring to cooperate in maintaining the populations of these fishes at levels which will permit the maximum sustainable catch for food and other purposes. ICCAT s objective is therefore to maintain populations of tunas and tuna-like fishes at levels that will permit maximum sustainable yield (MSY). ICCAT, being a regional organisation, provides a forum where the various countries exploiting tunas can work together to implement the strategy to meet this objective. The current strategy is to limit catches to sustainable levels based on a feedback process implemented by the Commission and reduce bycatch of small bigeye tunas. Scientific advice is provided and a TAC with a seasonal closed area agreed through this process, which therefore also includes evaluation of, and adaptation to, changing circumstance. The external review panel found that the objectives of ICCAT appeared to be met for 4 of the 14 stocks examined (29%), which included bigeye and yellowfin tuna. However, it is noticeable that recent changes appear to have been made to the seasonal closure without reference to scientific advice, rendering this management action less effective. The external review panel indicated that they thought more effective measures were needed to deal with the catch of small bigeye tuna. The designed aspect of the strategy to change overall selectivity therefore cannot be given full credit. In the case of the bigeye stock, the present TAC is t, but recent catches were below the TAC level. The assessment showed that the bigeye stock is not overfished, and catches between t will result in the stock being likely (>70%) to be above the MSY level. For catches around t, this remains likely (>60%), although the risk of overfishing would increase. MRAG OPAGAC/AGAC Tuna Purse Seine Pre-assessment Page 16