González-Herraiz, I. (Isabel)

English

Improving scientific advice to fishery managenent for resources of interest for Spain in Atlantic watersIMPRESS projectIMPRES

González-Herraiz, Isabel

Digital.CSIC

Searching FU 25 Nephrops stock reference points with SPiCT

Repositorio Institucional Digital del IEO

IMPRESS – SPICT WK – 30/09/2020 Searching FU 25 Nephrops stock Reference Points with SPiCT 1 FU 25 North Galicia IMPRESS – SPiCT WK SPAIN IMPRESS – SPICT WK – 30/09/2020 FU 25 North Galicia 2 Series STOCK CATCH  1975-2019 Commercial CPUE  1975-2019 DEMERSALES survey 1983-2019 SENTINEL survey  2017-2019 >11 MISREPORTING TOO SHORT POSSIBLE INDICES CATCH >11 MISREPORTING IMPRESS – SPICT WK – 30/09/2020 FU 25 North Galicia 3 010020030040050060070080019751977197919811983198519871989199119931995199719992001200320052007200920112013201520172019Catches (t)FU 25 Catches (t)TAC zero  (2 t) 2012-2016: Individual Transferable Quotas MISREPORTING! in Catches Annual Catch Series IMPRESS – SPICT WK – 30/09/2020 4 Catch Index BMSY (t) FMSY MSY B  (t)  F B /BMSY F/FMSY Catch (t) E (B_inf) 75-19 CPUE 18049 NA NA 1936 (19) 0.001 (19) 0.11 (19) NA 3 (20) NA 75-16 CPUE 21998 NA NA 8006 (16) 0.0016 (16) 0.36 (16) NA 13 (17) NA  75-11 CPUE 12314 NA NA 12461 (11) 0.0037 (11) 1.0 (11) NA  5 (12) NA CORUÑA PORT CPUE BIOMASS 2011 = 12461 t         seems to be very high           vs          Catch 2011 = 44 t Let’s try DEMERSAL survey index IMPRESS – SPICT WK – 30/09/2020 5 Catch index Convergence BMSY (t) FMSY MSY B  (t) 2019.81 F 2019.81 B /BMSY F/ FMSY Catch (t) E (B_inf) 75-19 DEM no 3462 na na  562 0.005  0.16 NA 3 (20) NA (20) DEMERSALES SURVEY INDEX Catch index BMSY (t) FMSY MSY B  (t) 2019.81 F 2019.81 B /BMSY F/FMSY Catch (t) E (B_inf) 83-19 DEM 806 0.07 62 460 0.007  0.57 0.09 3 (20) 2312 (20) 83-16 DEM 2529  0.02 67  411 0.04 0.16 1.6 17 1755 83-11 DEM 10425 0.06 672  141 0.5 0.01 7.6 67 199 USE DATA SINCE 1983 IMPRESS – SPICT WK – 30/09/2020 6 Data  - Annual Stock Commercial Catches  - Abundance Index: Demersales Survey (1983-2019) Stock  Year C_t DEM_kg/lanceFU25 1983 433 0.127FU25 1984 515 0.574FU25 1985 477 0.266FU25 1986 364 0.339FU25 1987 412 0.369FU25 1988 445 0.399FU25 1989 376 0.066FU25 1990 285 0.215FU25 1991 453 1.275FU25 1992 428 0.471FU25 1993 274 0.247FU25 1994 245 0.154FU25 1995 273 0.496FU25 1996 209 0.3FU25 1997 219 0.058FU25 1998 103 0.069FU25 1999 124 0.082FU25 2000 81 0.055FU25 2001 147 0.087FU25 2002 143 0.078FU25 2003 89 0.025FU25 2004 75 0.041FU25 2005 63 0.036FU25 2006 62 0.009FU25 2007 67 0.011FU25 2008 39 0.012FU25 2009 21 0.025FU25 2010 34 0.047FU25 2011 44 0.03FU25 2012 10 0.03FU25 2013 11 0.067FU25 2014 9 0.055FU25 2015 14 0.02FU25 2016 13 0.052FU25 2017 2 0.032FU25 2018 2 0.035FU25 2019 3 0.051IMPRESS – SPICT WK – 30/09/2020 7 INDEX : DEMERSALES 1983-2019 E(B_inf) Optimal effort Negative slope E(B_inf) E(B_inf) IMPRESS – SPICT WK – 30/09/2020 8 Catch BMSY FMSY MSY B 2019.81 F 2019 B/BMSY2019 F/FMSY 2019 Catch 2019.83 E (B_inf) 83-11 10425 t 0.06 672 t 141 t 0.47 0.013 7.6 67 t 199 INDEX : DEMERSALES 1983-2019 K= 48600 t IMPRESS – SPICT WK – 30/09/2020 9 INDEX : DEMERSALES 1983-2019 IMPRESS – SPICT WK – 30/09/2020 10 INDEX : DEMERSALES 1983-2019 Checklist:  1.- Convergence                   yes  2.- Variance        parameters finite           yes  3.- No assumptions        violation               ok   BIOMASS IMPRESS – SPICT WK – 30/09/2020 11 INDEX : DEMERSALES 1983-2019 Checklist:  1.- Convergence                   yes  2.- Variance        parameters finite           yes  3.- No assumptions        violation                           ok  4.- Retro convergence         no  5.- Realistic        production curve           yes  6.- Sensitivity to       ≠ initial values                +/-  7.- B &F IC < 1                      no IMPRESS – SPICT WK – 30/09/2020 12 Thank you IMPRESS – SPICT WK – 30/09/2020 13 Catch index BMSY (t) FMSY MSY B  (t) 2019.81 F 2019.81 B /BMSY F/FMSY Catch (t) E (B_inf) 83-19 DEM 806 0.07 62 460 0.007  0.57 0.09 3 (20) 2312 (20) CPUE 5953 NA NA 1923 0.0015 0.3 NA 3 (20) NA (20) 83-16 DEM 2529  0.02 67  411 0.04 0.16 1.6 17 1755 CPUE 2680 NA NA 2059 0.003 0.76 NA 7 NA 83-11 DEM 10425 0.06 672  141 0.5 0.01 7.6 67 199 CPUE NA NA NA 1483 0.005 NA NA 8 NA SURVEY INDEX vs COMMERCIAL FLEET INDEX IMPRESS – SPICT WK – 30/09/2020 14 Doubts 2.- Technical aspects   

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/11618/1/2020_09_29_IMPRESS_SPICT_NEP_FU_25_V10.pdf

Searching FU 25 Nephrops stock reference points with SPiCT

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