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Review of the statistical data and fishery trends for tropical tunas (2013)









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    Review of the statistical data and fishery trends for billfish 2013
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    PURPOSE To provide the Working Party on Billfish (WPB) with a review of the status of the information available on billfish species in the databases at the IOTC Secretariat as of July 2013, as well as a range of fishery indicators, including catch and effort trends, for fisheries catching billfish in the IOTC area of competence. It covers data on nomil catches, catch-and-effort, and size-frequency.
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    Report of the Fifteenth Session of the IOTC Working Party on Tropical Tunas 2013
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    The Fifteenth Session of the Indian Ocean Tu Commission‘s (IOTC) Working Party on Tropical Tus (WPTT) was held in San Sebastian, Spain, from 23 to 28 October 2013. The meeting was opened on 23 October 2013 by the Chair, Dr Hilario Murua (EU-Spain), who welcomed participants to San Sebastian, Spain. A total of 46 participants attended the Session (47 in 2012), including one invited expert, Dr. Andrew Cooper, from Simon Fraser University, Cada. The following are a subset of the complete recommenda tions from the WPTT15 to the Scientific Committee, which are provided at Appendix XII. Japan data collection and processing systems The WPTT THANKED Japan for addressing some of the concerns raised by the WPTT in 2012, and RECOMMENDED that Japan and the IOTC Secretariat continue joint work, in cooperation with other countries having longline fisheries, to address other issues identified by the WPTT, as the lack of specimens of small size from the samples and discrepancies in the average weights estimated using the available catch-and-effort and length frequency data. (para. 62) Taiwan,Chi data collection and processing systems NOTING that in recent years fishers from the Taiwan,Chi longline fleet have been collecting both length and weight measurements for the same specimens, the WPTT RECOMMENDED that the measured lengths and lengths derived from weight measurements are compared in order to validate the reliability of this dataset (para. 67) Length Frequency inter-sessiol meeting guide lines NOTING the size data issues (discrepancies in catch, effort and notably size data (low sampling rate, uneven distribution of sampling in regard to the spatial extent of the fishery) in the Japanese and Taiwan,Chi tropical tu data sets) identified by the WPTT in 2012 and 2013 and the Scientific Committee in 2012, the WPTT RECOMMENDED that an inter-sessiol meeting attached to the WPDCS and WPM on data collection and processing systems for size data from the main longline fleets in the Indian Ocean, be carried out in early 2014, under the guidelines contained in Appendix IV. (para. 74) The WPTT NOTED that the data collection and processing systems used for distant-water longline fisheries tend to apply to all oceans AGREEING that it is likely that the issues identified for the Indian Ocean also apply to other areas. In this regard, the WPTT RECOMMENDED that the IOTC Secretariat informs other tu-RFMO Secretariats about the issues identified and facilitates participation of their staf f to the WPDCS, where required. (para. 75) India fisheries NOTING the potential utility of the longline CPUEs derived from the research surveys conducted by the ?Fishery Survey of India?, the WPTT RECOMMENDED that as a high priority, India undertake a standardisation of the CPUE series, with the support of the IOTC Secretariat, and for this to be presented at the next WPTT meeting. (para. 92) Alysis of the Time-Area Closures (including Resolution 12/13) NOTING that the objective of Resolution 12 /13 is to decrease the overall pressure on the main targeted stocks in the Indian Ocean, in particular yellowfin tu and bigeye tu, and also to evaluate the impact of the current time/area closure and any altertive scerios on tropical tu population, the WPTT reiterated its previous RECOMMENDATION that the SC request that the Commission specify the level of reduction or the long term magement objectives to be achieved with the current or altertive time area closures, as these are not contained wit hin Resolution 12/13. (para. 245) Review of the draft, and adoption of the Report of the Fifteenth Session of the WPTT The WPTT RECOMMENDED that the Scientific Committee consider the consolidated set of recommendations arising from WPTT15, provided at Appendix XII, as well as the magement advice provided in the draft resource stock status summary for each of the tropical tu species under the IOTC mandate: (para. 271) o Bigeye tu (Thunnus obesus) – Appendix VII o Skipjack tu (Katsuwonus pelamis) – Appendix VIII o Yellowfin tu (Thunnus albacares) – Appendix IX A summary of the stock status for tropical tu species under the IOTC mandate is provided in Table 1.
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    Report of the Ninth Session of the IOTC Working Party on Data Collection and Statistics 2013
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    The Ninth Session of the Indian Ocean Tu Commission’s (IOTC) Working Party on Data Collection and Statistics (WPDCS) was held in Busan, Rep. of Korea, from 29 to 30 November 2013. A total of 23 participants attended the Session. The following are a subset of the complete recommendations from the WPDCS09 to the Scientific Committee, which are provided at Appendix VI. The WPDCS RECOMMENDED that the IOTC Scientific Committee considers to propose amendments to IOTC Resolution 10/02 to the Commission . (WPDCS09.01 (para. 14)) The WPDCS RECOMMENDED that the total number of days-at-sea covered by observers versus the total number of days-at-sea for each fleet over a year is used to estimate levels of coverage by observers under the Regiol Observer Scheme, instead of the number of trips. (WPDCS09.02 (para. 15)) The WPDCS RECOMMENDED that India reports a revised time-series of catch and effort for its longline fleet to the IOTC. (WPDCS09.04 (para. 25)) The WPDCS RECOMMENDED that Iran reports the available series of catch and effort data for its fisheries as a matter of priority. (WPDCS09.05 (para. 29)) The WPDCS RECOMMENDED that the IOTC Secretariat considers funding scientists and statistical officers from non IOC countries to the IOC-SmartFish funded regiol Workshop to understand the IOTC Data Requirements, in particular scientists and statistical officers from Iran, Indonesia, and Sri Lanka. (WPDCS09.06 (para. 31) The WPDCS RECOMMENDED that joint work on the documentation of procedu res for the collection, processing and reporting of size frequency data continues, based on a template produced by the IOTC Secretariat. (WPDCS09.07 (para. 41)) The WPDCS RECOMMENDED that the Commission considers funding of future activities under the Regiol Observer Scheme, by allocating specific funds to the implementation of capacity building activities in developing coastal countries of the IOTC Region. (WPDCS09.08 (para. 54)) The WPDCS NOTED that Maldives is working with the IOTC Secretaria t in the estimation of ratios of catch yellowfin tu:bigeye tu for its fisheries, and RECOMMENDED that Maldives filizes this work as soon as possible and reports a new series of catch to the IOTC and the results of this alysis to the next Meeting of the WPDCS and WPTT. (WPDCS09.09 (para. 59)) The WPDCS AGREED on the need to select a set of official equations to be used in the preparation of input files for the assessments of stocks of IOTC species and sharks, or other procedures used on those ass essments and RECOMMENDED that document IOTC–2013–WPDCS09–13 Rev_1 is forwarded to the Working Parties concerned for further consideration. The WPDCS further RECOMMENDED that, where possible, the Working Parties contemplate the use of keys to convert from non-standard measurements to standard measurements over deterministic methods. (WPDCS09.10 (para. 67)) The WPDCS RECOMMENDED that the IOTC Secretariat creates a template, preferably using MS Excel, to facilitate reporting of the Observer Trip Re ports, and makes it available through the IOTC Web Page. (WPDCS09.11 (para. 68)) The WPDCS NOTED the plans from the IOTC Secretariat to resume publication of the IOTC Data Summary in electronic form and RECOMMENDED that the IOTC Secretariat carries out this work during 2014 and presents the new Web based system to the next meeting of the WPDCS. (WPDCS09.12 (para. 69)) The WPDCS RECOMMENDED that the Scientific Committee note the new Chairperson, Dr Emmanuel Chassot (EU-France), of the WPDCS for t he next biennium. (WPDCS09.13 (para. 72))

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