Maximum sustainable yield (MSY) and optimum effort of fishing of - - PowerPoint PPT Presentation

Maximum sustainable yield (MSY) and

• ptimum effort of fishing of jack mackerel

(Trachurus murphyi) and pacific mackerel (Scomber japonicus) in Peru (1997-2006)

• Ing. Christian Garcia Gonzales

IMARPE - Callao

Introduction: Introduction:

Industrial fleet works over both species jack mackerel and pacific mackerel We assume that environmental conditions are affecting on similar way to both species. The model is apply to a multispecífic stock, similar to other fisheries, as a practical form to stablish a reference point for management ( Ref. D. Pauly). CPUE obtained could be considerer as availability index of jack mackerel and pacific mackerel on peruvian coast..

Calculate maximum sustainable yield (MSY) and optimum effort (OE). by applied Surplus Production Model, tipe Fox, based on catch and effort data In the jack mackerel and pacific mackerel fisheries for period 1997 - 2006 GOAL METHODS

Study Área Data

PBP

(Programa Bitácoras de Pesca)

1996 - 2007

Sampling in situ

Effective unit effort, based in hours per trip average of the total annual trips

Results

% C

• m

pos ition between J urel y C aballa 7 % 8 % 9 % 1 %

Catches Jurel y Caballa (1997-2006)

2 4 6 8 1 1 2 1 9 9 7 1 9 9 8 1 9 9 9 2 2 1 2 2 2 3 2 4 2 5 2 6 C a p t u r a ( t J u re l C a b a lla T

• ta

l % 1 % 2 % 3 % 4 % 5 % 6 % 7 % 1 9 9 7 1 9 9 8 1 9 9 9 2 2 1 2 2 2 3 2 4 2 5 2 6 J u re l C a b a lla E s fuerzo ( H rs de v iaje) Pes queria de J urel y C aballa (1 9 9 7

• 2

6 ) 2 4 6 8 1 1 2 1 4 1 9 9 7 1 9 9 8 1 9 9 9 2 2 1 2 2 2 3 2 4 2 5 2 6 C a p t u r a ( t

Results

DATOS

Capturas (t): JUREL + CABALLA Esfuerzo:

• Durac. Vjs Prom año (hrs)

Nº Emb

Modelo FOX

m (parámetro ecuación)

1.00

n 10 r

• 0.85

r2 0.69 MRS (t) 562 170 Limite Sup 618 925 Limite Inf 469 185 Nº Emb 86 600000

FOX

MODELO DE PRODUCCION GENERALIZADO

Y (t)

200 400 600 800 1000 1200 20 40 60 80 100 120

Captura vs Esfuerzo

f (horas promedio de viaje) C(t)

1997 1999 1998 2000 2005 2006 2004 2003 2002 2001

El año biológico de jurel corresponde al máximo pico de desove dándose entre octubre/noviembre (Dioses, 1995). 100000 200000 300000 400000 500000

1 11 21 31 41 51 61 71 81 91 101 111 121 131 141

FOX

f (horas promedio de viaje) f (Nº Embarcaciones)

25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475

Conclusions:

MSY for both species Jurel + Caballa was 562 thousands tons, with limits between 469 thousands tons and 619 thousands tons, showing r2= 0.69 and Optimum Effort = 30 hours per trip in average. From MSY and optimum effort obtained, it was calculated for management, the number of boats and holding capacity necessary. For these results we the number of boats and holding capacity necessary. For these results we use some indicators as number of annual trips average, efficiency (catch between holding capacity displacement) and number of trips by vessel by year.