Ecosystem-based fisheries resources assessment and management system in Jeonnam marine ranching in Korea

Transcription

1 PICES 17 th annual meetng, Dalan, Chna 29.Oct.2008 Ecosystem-based fsheres resources assessment and management system n Jeonnam marne ranchng n Korea Hee Won Park and Chang-Ik Zhang Pukyong Natonal Unversty

2 Current fsheres management n Korea waters TAC-based management for 10 speces Resource rebuldng actvtes by artfcal reefs Releasng fres and juvenles, seaweed beds Buy-back program to reduce fshng vessels MPAs Marne ranchng program Self-regulatory fsheres management

3 Ecosystem based fsheres approach n Korea Ecosystem modelng - Apply to marne ranchng ecosystems (Lee, 2007) - Apply to Korean waters (East/Japan sea, Yellow sea) Ecosystem-based ntegrated fsheres assessment approach Ecologcal Rsk Assessment - Analyss for Large purse sene fshery (Park, 2007; Kwon,2007) Ecosystem-based fsheres assessment and management - Marne ranchng -Stock rebuldng -TAC fsheres

4 In ths study Introducton for ecosystem-based fsheres assessment usng Jeonnam marne ranchng data Effectveness of marne ranchng program between pre-, post constructon by ecosystem-based fshers assessment approach

5 Jeonnam Marne ranchng program Locaton - Western part of East-Chna Sea Study perods ~2008 (7 years) Areas - Total area : 203Km 2 - Marne ranchng area : 151km 2 Target speces - Black seabream, Rock bream, Black rockfsh

6 Data and Methods Usng data - MOMAF, Study on the foundaton-layng of Jeonnam archpelago marne ranchng program n Korea ( ) Comparng Perods : Pre-constructon of Jeonnam marne ranchng : Post-constructon of Jeonnam marne ranchng

7 Ecosystem based fsheres assessment? 2 ter system (Ter 1 and Ter 2) Quanttatve analyss Ter 1 Level of nformaton Hgh For target speces 19 ndcators used Sem -quanttatve & qualty analyss Ter 2 Level of nformaton low For bycatch speces 24 ndcators used

8 Rsk Indces ORI (Objectves rsk ndex) ORI n = 0 = n = 1 I W W I : Score of ndcator W : Weghtng factor of ndcator n : Number of ndcators SRI (Speces rsk ndex) SRI = λ S ORI S + λ B ORI B + λ H ORI H FRI (Fsheres rsk ndex) FRI = B SRI B B : Bomass or bomass ndex of speces

9 Rsk Indces MI (Management status mprovement Index) MI O ORIt ORI ORI t+ = t 100 MI S SRI SRI SRI t t+ = t 100 MI F FRIt FRI FRI t+ = t 100

10 Calculaton for rsk scores Reference ponts (RP), Rsk, Management Green zone Yellow zone Red zone Target RP Lmt RP 0 0~ X target > X lmt case (e.g., bomass) -If X lmt X < X target, RS x = RS max X ( X target target X X lmt ), where RS max = 2

11 Indcator and reference ponts Ter 1_ Sustanablty Indcator Reference ponts Target (0) Lmt (0~2) Beyond lmt (2) Bomass (B) B B 40% B 40% >B B 35% B <B 35% or CPUE (U) U U ABC U ABC >U U lmt 1 U <U lmt Fshng mortalty (F) F F 40% (or F 0.1 ) F 40% (or F 0.1 ) < F F MSY F>F MSY or Catch (C) C ABC ABC < C MSY C>MSY Age at frst capture (t) t t target t target >t t lmt 2 t <t lmt Habtat sze (H) H H target H target >H H lmt 3 H <H lmt FIB ndex FIB FIB target FIB target >FIB FIB lmt 4 FIB <FIB lmt FRP ndex FRP FRP target FRP target >FRP FRP lmt 5 FRP<FRP lmt Total producton of ecosystem (P) P P target P target >P P lmt 6 P<P lmt TL TL FIB log( Y (1/ ) ) log( (1/ ) 0 TE FIB (Fsh s balance) = Y0 TE ) (Pauly et al., 2000) Y MR Y MR FRP ( ) ( 0 0 FRP (Fsh Reproducton Potental) = log log ) q f q f (Lee et al,, 2007) 0

12 Indcator and reference ponts Ter 1_ Bodversty Indcator Reference ponts Target (0) Lmt (0~2) Beyond lmt (2) Bycatch rate (BC/C) (BC/C) (BC/C) target (BC/C) target <(BC/C) (BC/C) lmt 1 (BC/C) >(BC/C) lmt Dscard rate (DC/C) (DC/C) (DC/C) target (DC/C) target <(DC/C) (DC/C) lmt 2 (DC/C) >(DC/C) lmt Mean trophc level (TL) TL TL target TL target >TL TL lmt 3 TL <Tl lmt Dversty ndex (DI) DI DI target DI target >DI DI lmt 4 DI <DI lmt Invasve/Tradtonal speces n catch (I/T) (I/T) (I/T) target (I/T) target <(I/T) (I/T) lmt 5 (I/T) >(I/T) lmt N Dversty ndex: DI = P j ln P j (Modfed from Shannon and Wener (1963)) j= 1 where N : s the total number of ndvduals, P j : proporton of each speces

13 Indcator and reference ponts Ter 1_ Habtats Indcator Reference ponts Target (0) Lmt (0~2) Beyond lmt (2) Crtcal habtat damage rate (DH/H) (DH/H) (DH/H) target (DH/H) target <(DH/H) (DH/H) lmt 1 (DH/H) >(DH/H) lmt Polluton rate of spawnng and nursery ground (PG/G) (PG/G) (PG/G) target (PG/G) target <(PG/G) (PG/G) lmt 2 (PG/G) >(PG/G) lmt Lost fshng gear (Frequency, FR) FR FR target FR target < FR FR lmt 3 FR > FR lmt Dscarded wastes (DW) DW DW target DW target < DW DW lmt 4 DW > DW lmt Prohbted area from fshng (PA) PA PA target PA target >PA PA lmt 5 PA <PA lmt No. of artfcal reefs (N) N-N target 0.2N target < 0.2N target N-N target 0.4N target N-N target >0.4N target Area of artfcal seaweed bed (A) A-A target 0.2A target 0.2A target < A-A target 0.4A target A-A target >0.4A target

14 Indcator and reference ponts Ter 2_ Sustanablty Indcator Reference ponts Target (0) Lmt (1) Beyond lmt (2) CPUE CPUE data are avalable and not declnng CPUE data are avalable, but declnng CPUE data are not avalable Precautonary approach and senstvty of stock assessment Adequate stock assessment s provded and precautonary approach s adopted Inadequate stock assessment s provded, but precautonary approach s adopted Inadequate stock assessment, and precautonary approach s not adopted Restrcted access Fxed access, lttle latent effort exsts ( 30% of lcenses nactve) New entrants can be lcensed >30% latent effort n fshery Open access Fshery montorng and samplng Observer program n place, samplng for all fshery data Montorng and samplng for a lmted number of fsheres Neglgble montorng or samplng Fshng method All fshng methods and patterns are evaluated and changes montored Fshng methods and patterns are evaluated for man methods and some geographcal areas Man fshng methods and patterns are not evaluated Sze at entry Sze at maturty <Sze at maturty, but less than 20% of catch mmature Greater than 20% of the catch mmature or sze at maturty unknown

15 Applcaton for Jeonnam marne ranchng Target Area - Jeonnam marne ranchng (151Km 2 ) Target fshery - Pole and lne fshery Target speces - Black sea bream Bycatch speces (6 speces) - Jacopever rockfsh, Black rockfsh, Red sea bream, Sea bass, Yellow tal, Common eel

16 Results _ Rsk score n Jeonnam marne ranchng Objectves Indcator Sustanablty Bodversty Habtat 1. CPUE Catch Age at frst capture Habtat sze FIB ndex FRP ndex Total producton of ecosystem Bycatch rate Dscard rate Mean trophc level Dversty ndex Invasve/Tradtonal speces catch Crtcal habtat damage rate Polluton rate of spawnng and nursery ground Lost fshng gear Dscarded wastes Prohbted area from fshng No. of artfcal reefs Area of artfcal seaweed bed 2 0

17 Results Ter 1 _ Black sea bream (Acanthopagrus schlegel) Objectves ORI (Zone) MI Sgnfcance Sustanablty *** Bodversty * Habtat ** SRI *** FRI *** denotes a sgnfcant dfference at α < level ** denotes a sgnfcant dfference at α < 0.01 level * denotes a sgnfcant dfference at α < 0.05 level

18 Results ORI dagrams_ Ter 1 Pre-constructon (2003) Post-constructon (2007)

19 Result Ter 2 _ Bycatch speces Speces SRI MI Black rockfsh Red sea bream Common seabass Jacoveper rockfsh Yellow tal Common eel

20 Results ORI dagrams_ Ter 2 Pre-constructon (2003) Post-constructon (2007)

21 Concluson Effectveness of Jeonnam marne ranchng area Result of Ter 1(Black seabream) - Improved sustanablty, and SRI at crtcal level - Improved habtat at 0.01 crtcal level - Improved bodversty at 0.05 crtcal level

22 Concluson Assessment methodology hasn t verfed - More consderng of reference ponts - Need to basc study to get nformaton of reference ponts Develop the socal economc effort