ASSESSMENT AND MONITORING OF THE FISHERY RESOURCES AND THE ECOSYSTEMS IN THE STRAITS OF SICILY MEDSUDMED GCP/RER/010/ITA

Transcription

1 ASSESSMENT AND MONITORING OF THE FISHERY RESOURCES AND THE ECOSYSTEMS IN THE STRAITS OF SICILY MEDSUDMED GCP/RER/010/ITA MiPAAF FAO-MedSudMed CC/10/Info th Meeting of the MedSudMed Coordination Committee Djerba, Tunisia, March 2012 Stock Assessment Forms on Demersal Fisheries Resources, namely Merluccius merluccius. Data presented at the GFCM-SAC Working Group on Stock Assessment on Demersal Species (Greece, October 2011)

2 SAC GFCM Sub-Committee on Stock Assessment 1 DAY MONTH YEAR Date* 20 October 2011 Code* HKE9911S. Authors* S. Ben Meriem, F.Fiorentino, A.Arneri, L. Ceriola, V. Gancitano, O. Jarboui, R. Mifsud Affiliation* Institut National des Sciences et Technologies de la Mer (INSTM), Tunisia; IAMC-CNR Mazara del Vallo, Italy; Ministry for Resources and Rural Affairs (MRRA), Malta GFCM Priority S Merluccius merluccius - HKE HKE Species Scientific name* Source: GFCM Priority Species Source: Source: - Geographical area* GSA 12, 13, 14, 15 and 16 Geographical Sub-Area (GSA)* Combination of GSAs Combination of GSAs 16 - South of Sicily 15 - Malta Island 12 - Northern Tunisia

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4 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet #0 Assessment form Basic data on the assessment Code: HKE9911S. 1 Date* 20 Oct 2011 Authors* S. Ben Meriem, F.Fiorentino, A.Arneri, L. Ceriola, V. Gancitano, O. Jarboui, R. Mifsud Species Scientific name* Merluccius merluccius - HKE Merluccius merluccius - HKE Data Source Species common name* HAKE GSA* 16 - South of Sicily, 15 - Malta Island, 12 - Northern Tunisia Period of time* South of Sicily, 15 - Malta Island, 12 - Northern Tunisia Description of the analysis Type of data* Method of assessment* LFD from commercial catches, landings data LCA, Y/R analysis Tunisian national data collection Data source* programme, EU Data Collection Framework Analen, VIT4win Software used* Sheets filled out B P1 P2a P2b G A1 A2 A3 Y Other D Z C Comments, bibliography, etc. 1500

5 Comments, bibliography, etc Sheet #0 (page 2)

6 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet B Assessment form Biology of the species Code: HKE9911S. Biology Somatic magnitude measured (LH, LC, etc)* TL Sex Fem Mal Both Unsexed Maximum size observed Size at first maturity Recruitment size Units* Reproduction season Reproduction areas Nursery areas cm all year yes yes Parameters used (state units and information sources) Growth model Length weight relationship L K t0 Data source a b M sex ratio (mal/fem) Sex Units female male both unsexed cm year Comments 1877 The sex ratio is calculated as F/F+M. For the analysis used the growth and a, b parameters from Italian and Tunisian data.

7 Comments 4000 Sheet B (page 2)

8 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet P1 Assessment form General information about the fishery Code: HKE9911S. Data source* Tunisian National Data Collection Programme, EU Data Collection Framework Year (s)* 2010 Data aggregation (by year, average figures between years, etc.)* By year Fleet and catches (please state units) Country GSA Fleet Segment Fishing Gear Class Group of Target Species Species Operational Unit 1* Operational Unit 2 Operational Unit 3 Operational Unit 4 Operational Unit 5 ITA ITA TUN TUN E - Trawl (12-24 metres) F - Trawl (>24 metres) F - Trawl (>24 metres) H - Purse Seine (12-24 metres) 03 - Trawls 03 - Trawls 03 - Trawls 03 - Trawls 34 - Demersal slope species 34 - Demersal slope species 34 - Demersal slope species 34 - Demersal slope species HKE HKE HKE HKE Operational Units* Fleet (n of boats)* Kilos or Tons Catch (species assessed) Other species caught Discards (species assessed) Discards (other species caught) Effort units ITA 99 E HKE ITA 99 F HKE TUN 99 F HKE TUN 99 H HKE 133 Tons Tons Tons Tons Total Legal minimum size EU: 20mm CL (EC 1967/2006) Comments

9 Sheet P1 (page 2) Comments

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11 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet P2a Assessment form Fishery by Operational Unit Code: HKE9911S. Page 1 / 4 Data source* EU Data Collection Framework OpUnit 1* ITA 99 E HKE Time series Year* 2010 Catch 1041 Minimum size Average size Lc Maximum size Fleet Year Catch Minimum size Average size Lc Maximum size Fleet Selectivity L25 L50 L75 Selection factor Remarks 200 Structure by size or age TL (cm) Sex Combined

12 Sheet P2a (Page 1 / 4-2 sheet) Structure by size or age

13 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet P2a Assessment form Fishery by Operational Unit Code: HKE9911S. Page 2 / 4 Data source* EU Data Collection Framework OpUnit 2* ITA 99 F HKE Time series Year* 2010 Catch 446 Minimum size Average size Lc Maximum size Fleet Year Catch Minimum size Average size Lc Maximum size Fleet Selectivity L25 L50 L75 Selection factor Remarks 200 Structure by size or age TL (cm) Sex Combined

14 Sheet P2a (Page 2 / 4-2 sheet)

15 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet P2a Assessment form Fishery by Operational Unit Code: HKE9911S. Page 3 / 4 Data source* Tunisian National Data Collection Programme OpUnit 3* TUN 99 F HKE Time series Year* 2010 Catch 599 Minimum size Average size Lc Maximum size Fleet Year Catch Minimum size Average size Lc Maximum size Fleet Selectivity L25 L50 L75 Selection factor Remarks 200 Structure by size or age TL (cm) Sex Combined

16 Sheet P2a (Page 3 / 4-2 sheet)

17 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet P2a Assessment form Fishery by Operational Unit Code: HKE9911S. Page 4 / 4 Data source* Tunisian National Data Collection Programme OpUnit 4* TUN 99 H HKE Time series Year* 2010 Catch 80 Minimum size Average size Lc Maximum size Fleet Year Catch Minimum size Average size Lc Maximum size Fleet Selectivity L25 L50 L75 Selection factor Remarks 200 Structure by size or age TL (cm) Sex Combined

18 Sheet P2a (Page 4 / 4-2 sheet)

19 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Assessment form Sheet A1 Indirect methods: VPA, LCA Code: HKE9911S. Sex* F+M 2010 Page 1 / 2 Time series Analysis # * LCA Data (mark with X) Size X Age Model (mark with X) Cohorts Pseudocohorts X Equation used # of gears VPA 4 Tunig method Software VIT 4 win F terminal Fterm 0.28 SC; Population results (please state units) Sizes Minimum 8 Average 21.4 Maximum 72 Critical 20 Ages Amount Recruitment Average population Virgin population 1.36 Turnover Biomass 2651 cm year millions t Average mortality Total Italian Italian >24 F Gear TUN TRW TUN TRAM F 2 Z (F1 and F2 represent different possible calculations. Please state them) Comments 1500

20 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Assessment form Sheet A1 Indirect methods: VPA, LCA Code: HKE9911S. Sex* Sex combined Page 2 / 2 Time series Analysis # * LCA Data (mark with X) Size X Age Model (mark with X) Cohorts Pseudocohorts X Equation used # of gears VPA 4 Tunig method Software vit 4 win F terminal Fterm SC; Population results (please state units) Minimum Average Maximum Critical Sizes Ages Amount Biomass 0.08 Recruitment Average population Virgin population 0.4 Turnover cm year millions t Average mortality F 1 Total 1.32 Gear Italian Italian >24 TUN TRW TUN TRAM F 2 Z (F1 and F2 represent different possible calculations. Please state them) Comments 1500

21 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet A2 Assessment form Indirect methods: data Code: HKE9911S. Sex* Sex combined Gear* TRAWL& Trammel Analysis # * VPA Data source LFD Data N individuals ITA 12_24 Sex combined ITA>24 Sex combined TUN TRW Sex combined TUN TRAM Sex combined TL (cm)

22 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet A3 Assessment form Indirect methods: VPA results Code: HKE9911S. Page 1 / 2 Sex* Sex comb Gear* Trawl &trammel Analysis #* VPA Population in figures Mean popolation at sea Number at sea TL (cm) Population in biomass Mean biomass at sea Biomass at sea (g) TL (cm) Fishing mortality rates Fishing mortality by metier - sex combined

23 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet A3 Assessment form Indirect methods: VPA results Sex* SC Gear* Trawl&trammel Analysis #* Code: HKE9911S. Page 2 / 2 VPA Population in figures N at sea Mean popolation at sea TL (cm) Population in biomass Biomass at sea (g) Mean biomass at sea TL (cm) Fishing mortality rates Fishing mortality by metier - sex combined TL (cm)

24 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet Y Assessment form Indirect methods: Y/R Sex Code: HKE9911S. Analysis # # of gears Software Parameters used Vector F Vector M Vector N Model characteristics Values of VPA and Y/R analysis were estimated by sex combined only 2010 data. Results Current YR Maximum Y/R Y/R 0.1 Total ITA 12_24 ITA >24 Gear TUN TRAWL TUN TRAM F max F 0.1 Current B/R Maximum B/R B/R 0.1 Current SSB/R SSB/R 0.1 SSB/R virgin value left value right by ITA param. by TUN param. Comments Y7R (g) Y/R (g) total SSB/R (g) Y/R (g) ITA 12_24 Y/R (g) ITA >24 Y/R (g) TUN TRAM Y/R (g) TUN TRW Effort level SSB/R (g)

25 Sheet Y (page 2) Comments Y/R (g) Y/R tot ITA 12_24 ITA>24 TUN_TRW TUN_TRAM SSB/R effort level SSB/R (g)

26 Assessment form SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Sheet D Diagnosis Code: HKE9911S. Indicators and reference points Criterion Current value Units Reference Point Trend Comments B SSB F Y CPUE Stock Status* Use one (or both) of the following two systems for the stock assessment status description Unidimensional FALSE FALSE FALSE FALSE FALSE FALSE? - (or blank) Not known or uncertain. Not much information is available to make a judgment; U - Underexploited, undeveloped or new fishery. Believed to have a significant potential for expansion in total production; M - Moderately exploited, exploited with a low level of fishing effort. Believed to have some limited potential for expansion in total production; F - Fully exploited. The fishery is operating at or close to an optimal yield level, with no expected room for further expansion; O - Overexploited. The fishery is being exploited at above a level which is believed to be sustainable in the long term, with no potential room for further expansion and a higher risk of stock depletion/collapse; D - Depleted. Catches are well below historical levels, irrespective of the amount of fishing effort exerted; FALSE R - Recovering. Catches are again increasing after having been depleted or a collapse from a previous; Bidimensional FALSE FALSE FALSE FALSE FALSE FALSE Exploitation rate No or low fishing Moderate fishing High fishing mortality Uncertain / Not assessed FALSE FALSE Stock abundance Virgin or high abundance Intermediate abundance Low abundance FALSE Depleted Uncertain / Not assessed

27 Sheet D (page 2) Comments 4000

28 SAC GFCM - Sub-Committee on Stock Assessment (SCSA) Abstract for SCSA reporting Authors S. Ben Meriem, F.Fiorentino, A.Arneri, L. Ceriola, V. Gancitano, O. Jarboui, R. Mifsud Year Species Scientific name Merluccius merluccius - HKE Source: GFCM Priority Species Source: - Source: - Geographical Sub-Area 16 - South of Sicily, 15 - Malta Island, 12 - Northern Tunisia Fisheries (brief description of the fishery)* 1500

29 Source of management advice* (brief description of material -data- and methods used for the assessment) 1500 Stock Status* Exploitation rate Stock abundance Comments

30 Management advice and recommendations* 0

31 Advice for scientific research* 0