Progress Report on the EPO Silky Shark Stock Assessment
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1 Progress Report on the EPO Silky Shark Stock Assessment Comisión Interamericana del Atún tropical Inter-American Tropical Tuna Commission (IATTC) 3 rd Meeting of the Scientific Advisory Committee La Jolla, USA, May 15-18, 2012
2 Topics Background Silky sharks and the IATTC IATTC Shark Technical Meetings Review of silky shark assessment work Assessment modeling work (Stock Synthesis) Update on data availability: progress and challenges Workplan for SAC4 assessment
3 Background Shark catch (bycatch) in EPO tuna fisheries: Purse seine High-seas longline Artisanal fisheries (coastal nations) Indices of abundance presently only available for purse-seine fishery These trends are cause for concern
4 SIL assessment a regional task Tibu rón sedoso one color Silky shark 30 C. falciformis present
5
6 Standardized CPUE trends, floating-object sets all all large medium medium small large
7 Standardized trends, dolphin and unassociated sets
8 Shark research activities Bycatch mitigation Fishing gear (catchability and selectivity) But some fisheries target sharks Stock assessment Highlights areas where information is missing Provides guidance on utility of mitigation measures Evaluate fishery impacts, spatio-temporal closures Information to guide management
9 Progress towards assessment Three IATTC Technical meetings November 2009 May 2011 November 2011 ( Workshop ) Achievements Identified data requirements, sources and gaps Obtained and compiled several data sources Developed an assessment model framework (Stock Synthesis)
10 Model framework update SS model developed at the workshop Stock recruitment relationship for low-fecund species (based on number of pups per female) More flexible selectivity curves Implementation of stock definitions (north and south)
11 Data availability update Biological Stock structure (genetics) Growth Length-length, Length-weight Reproduction (Maturity/fecundity/frequency) Fishery Catch/effort Indices of abundance (CPUE) Composition (size/stage)
12 Stock structure: Spatial distribution by life-stage School and dolphin sets Floating object sets Silky sharks 30 Silky sharks 30 Dolphin and School sets Floating-object sets SmallSize SmallSize 20 MedSize 20 MedSize 20 LargeSize LargeSize Roman-Verdesoto and Orozco-Zoller, 2005
13 Stock structure genetic data John Hyde and Carol Kimbrell, NOAA-SWFSC
14 Shark catches in the EPO Bycatch of tuna purse seine fishery Large vessels (class 6, >363 tons) Medium-size vessels (class 1-5, 363 tons) Bycatch of tuna longline fishery High seas longline fleets Artisanal fisheries Bycatch/target EPO coastal nations
15 Data purse seine catch Catch estimates are available, By shark size category (<90cm TL, cm; >150cm)
16 Data high-seas longline catch Catch estimates do not exist for all fleets Effort data are available Workshop contribution: limited observer (CHI, KOR) and training-vessel CPUE data (JPN) Task underway: estimate longline catches,
17 Data coastal nations Data available No SIL catches for many nations, but estimates of total/gray shark landings are available from various sources Effort data does not exist Challenges Landings of international high seas LL fleet landing in Central America may be duplicated with IATTC estimates of LL SIL catches Species composition data not available (%SIL) Total-to-dressed Weight conversion factors not available
18 Data coastal nations Workshop contribution Total/gray/SIL shark landing estimates (Mexico, Central-America, Ecuador); assumptions made for missing data Tasks underway Obtain catch estimates from total/gray data Work on duplication issues Obtain weight conversion factors
19 Data indices of abundance Purse-seine CPUE data are available for class-6 vessels Workshop contribution: Limited artisanal CPUE data for the northern area Tasks underway: Estimate standardized indices from these data
20 Data catch size composition Purse-seine size composition data are available for size-class Workshop contribution: Limited size composition data for some high-seas longline fleets (CHI, KOR) Limited size composition data for some artisanal fleets
21 Challenges Stock structure uncertain Definition of stock boundary around Galapagos unclear Potential data duplication issues High seas international fleet landing in Central-America Species identification SIL is contained on gray shark category Dressed to total weight conversions needed Costa Rica example
22 Plan for SAC4 SIL assessment Ongoing work with to reduce remaining uncertainties: Stock structure (N-S split) Potential duplication of Central-American sources Species composition (%SIL) Weight conversion factors Full assessment workshop (early 2013) Present assessment to SAC4
23 See report of 3 rd meeting Shark-workshop-Meeting-report-Dec- 2011ENG.pdf
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