Interim Harvest Strategy Framework for Tropical Tuna in IAW

Transcription

1 Interim Harvest Strategy Framework for Tropical Tuna in IAW Campbell Davies, on behalf of the Harvest Strategy Steering Committee and Technical Working Group 3 rd Bali Tuna Conference, Padma Hotel, Bali 31 May 2018

2 What is a harvest strategy? An agreed basis for monitoring and assessing a fishery AND; adjusting the level of fishing; using a specified management measure, BASED ON the harvest control rule to meet specific objectives Monitoring Analysis HCR Adaptive Feedback Loop Implementation Management

3 Objectives and Reference Points Objective to ensure the sustainability of yellowfin tuna, bigeye tuna and skipjack tuna resources through harvest strategy implementation. Interim Limit Reference Point To maintain spawning stock biomass above 0.2 of the unfished level with a probability of 90%. Rationale Reduce the risk of declines in average recruitment to the stock Maintain average higher catches over the long term

4 Objectives and Reference Points Target Reference Point A target reference point for tuna in archipelagic waters has not been decided as it requires more detailed consideration of implications for social and economic objectives for the fishery. WCPFC TRP for Skipjack = 50% unfished spawning biomass IOTC Interim TRP for SKJ = 40% unfished spawning biomass Rationale To maximise the long-term social and ecocomic benefits from the fishery. Will be investigated further through stakeholder consultation and MSE

5 Role of Stock Assessment Advice on stock status is provided by regional stock assessments from WCPFC. Harvest Strategy Framework uses them in two ways: 1. Compare stock status to Reference Points 2. Use output to condition simulation models for harvest strategy testing

6 Current WCPFC advice on stock status - SKJ Region 4 Depletion 2015 = 0.25 Overall Depletion = 0.58

7 Current WCPFC advice on stock status - YFT Region 7 Depletion = 0.27 Overall Depletion = 0.33

8 Operating models for SKJ for MSE Use fishery and stock parameters from regional stock assessment to characterise Operating Models for case study area for MSE Virtual reality for testing harvest strategies and defining reference points, given best available science

9 Operating Models for YFT for MSE Preliminary Operating Models for MSE developed based on Area 7 From 2017 WCPFC Stock Assessment OMs require further development to represent plausible uncertainty in biology, monitoring and management.

10 Skipjack framework 1. PL catch & Effort 2. Size dist of Catch Analysis CPUE standardisation Trend in mean size Options for Empirical HCR Implementation (TBD) Effort Limit (TBD)

11 Yellowfin framework 1. HL catch & Effort 2. Size dist of Catch Analysis CPUE standardisation Trend in mean size Options for Empirical HCR Implementation (TBD) Effort Limit (TBD)

12 Available Management Measures Limit on use of Fish Aggregating Device. Spatial closure (of important spawning or nursery grounds) and temporal closure (during important events, such as spawning). Number of fishing days (per gear, for semi industrial and industrial vessels). Number of vessels limited entry (per gear; for semi industrial and industrial vessels through licensing, permits, taxing, royalties). Total Allowable Catch (TAC) limits per Fishery Management Area.

13 Catch by gear by stock assessment region Yellowfin Skipjack

14 Specific Management Measures Need to define practically feasible, affordable, effective management measures to control fishing Must cover the major sources of fishing mortality to be effective and equitable Design process must be consultative and draw on Industry, NGO and provincial and local government experience and expertise to account for regional differences in the fisheries and result in practical options. Simplicity is a virtue; the more complex a management measure, generally, the more difficult and expensive it is to monitor and enforce.

15 Action Plan Maintenance, extension and improvement of fisheries monitoring and data collection programs Targeted research for biology and improved CPUE standardisation Testing, refinement and selection of operational objectives and harvest strategy (MSE process) Specification and implementation of management measures Confirmation of regulatory and institutional arrangements required for harvest strategy implementation Policy, stakeholder and science capacity development for harvest strategy implementation

16 Summary Harvest Strategy Framework provides a foundation on which to build and identifies requirements for practical implementation The HS process has: Consolidated and reviewed available monitoring series and identified those fit for purpose for harvest strategies for SKJ and YFT. Engaged a wide range of Industry, government and NGO stakeholders Build understanding and technical capacity in operational fisheries management and HS and MSE Developed MSE models required to test and select harvest strategies Contributed to meeting some elements of the MSC FIP process. Provided a draft action plan for further development and implementation But!

17 Next Steps This is just the start of the journey. High quality monitoring data is a guiding light.. Practical, effective management measures will keep you on course and avoid unpleasant experiences Communication, consultation and collaboration are the essential companions for an interesting and successful journey.

18 Acknowledgements MMAF (DGCF, CFR) Indonesian Tuna Harvest Strategy Steering Committee Indonesian Tuna Harvest Strategy Technical Working Group WPEA MDPI IPLNF AP2HL SFP Stakeholder Workshop participants

19 Example of MSE Target HCR Slope HCR

20 Stock assessment and projections Focus on estimating: Stock status relative to Reference Points Fishing mortality relative to Reference Points Productivity and population dynamics Management Advice based on Best Assessment and projections Constant catch projections relative to Reference Points Short term (next 1-3 years) Advice can change between updates of stock assessment model(s)

21 What is a harvest strategy? An agreed basis for monitoring and assessing a fishery AND; adjusting the level of fishing; using a specified management measure, BASED ON the harvest control rule to meet specific objectives Monitoring Analysis HCR Adaptive Feedback Loop Implementation Management

22 Different components = different strategy MP1 MP2 MP3 Monitoring (CPUE) Analysis (CPUE index) HCR Implementation Effort limit

23 Different components = different strategy MP1 MP2 MP3 Monitoring (Tagging) Analysis (Fishing Mortality) HCR Implementation Effort Limit

24 Different components = different strategy MP3 MP2 Monitoring MP1 Monitoring (size distribution) (Tagging) Analysis Analysis (trend in Ave (Fishing Size) Mortality) Decision HCR Rule / HCR Implementation Implementation Effort Limit Management Measure

25 Compare performance between Strategies Trip/year Size Lim Gear

26 Management Strategy Evaluation - MSE MSE involves developing and testing a range of harvest strategies through modelling and stakeholder consultation to select a final harvest strategy for to implement in the real fishery

27 Summary of Harvest Strategy Framework Development Date Meeting type Location October 30-31, Preparation meeting Bogor, Java 2014 March 25-27, 2015 Harvest strategy preparation and Bogor, Java introduction meeting May 18-22, 2015 Stakeholder consultation and expert Bogor, Java meeting August 10, 2015 Pre-workshop for data analysis Bogor, Java November 16-18, Stakeholder consultation Kuta, Bali 2015 November Baseline data to develop harvest Kuta, Bali strategies April 4-7, st Technical meeting for harvest Bogor, Java strategy development November 10-11, 2 nd Technical meeting for harvest Denpasar, Bali 2016 strategy development November 14-16, Stakeholder consultation Bogor, Java 2016 March 6-7, rd technical meeting for harvest Jakarta, Java strategy development March 8-10, th Stakeholder consultation Jakarta, Java July 12-13, th Stakeholder consultation Loka Tuna, Bali October th Technical Meeting Bogor, Java November th Stakeholder consultation Bogor, Java