Maximum sustainable yield (MSY) and optimum 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 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). We assume that environmental conditions are affecting on similar way to both species. CPUE obtained could be considerer as availability index of jack mackerel and pacific mackerel on peruvian coast..
GOAL 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 METHODS Data Study Área PBP (Programa Bitácoras de Pesca) Sampling in situ 1996 - 2007 Effective unit effort, based in hours per trip average of the total annual trips
Results Catches Jurel y Caballa (1997-2006) 1 2 0 0 0 0 0 1 0 0 0 0 0 0 8 0 0 0 0 0 t ( a r u t p 6 0 0 0 0 0 a C 4 0 0 0 0 0 2 0 0 0 0 0 0 1 9 9 7 1 9 9 8 1 9 9 9 2 0 0 0 2 0 0 1 2 0 0 2 2 0 0 3 2 0 0 4 2 0 0 5 2 0 0 6 J u re l C a b a lla T o ta l % C om pos ition between J urel y C aballa 1 0 0 % 9 0 % 8 0 % 7 7 0 0 % % 6 0 % 5 0 % 4 0 % 3 0 % 2 0 % 1 0 % 0 % 1 9 9 7 1 9 9 8 1 9 9 9 2 0 0 0 2 0 0 1 2 0 0 2 2 0 0 3 2 0 0 4 2 0 0 5 2 0 0 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 0 0 6 ) 1 4 0 1 2 0 1 0 0 t ( a r 8 0 u p t a C 6 0 4 0 2 0 0 1 9 9 7 1 9 9 8 1 9 9 9 2 0 0 0 2 0 0 1 2 0 0 2 2 0 0 3 2 0 0 4 2 0 0 5 2 0 0 6
Results DATOS Captura vs Esfuerzo C(t) Capturas (t): JUREL + CABALLA 1200 Esfuerzo: Durac. Vjs Prom año (hrs) 2001 Nº Emb 1000 Modelo FOX 800 1998 1.00 m (parámetro ecuación) n 10 600 r -0.85 1999 2006 r 2 0.69 1997 400 2003 MRS (t) 562 170 2000 2002 2004 Limite Sup 200 2005 618 925 Limite Inf 469 185 0 Nº Emb 86 0 20 40 60 80 100 120 f (horas promedio de viaje) Y (t) MODELO DE PRODUCCION GENERALIZADO 600000 FOX FOX 500000 400000 300000 200000 100000 0 El año biológico de jurel corresponde al máximo pico de desove 1 11 21 31 41 51 61 71 81 91 101 111 121 131 141 f (horas promedio de viaje) dándose entre octubre/noviembre (Dioses, 1995). 0 0 25 25 50 50 75 75 100 100 125 125 150 150 175 175 200 200 225 225 250 250 275 275 300 300 325 325 350 350 375 375 400 400 425 425 450 450 475 475 f (Nº Embarcaciones)
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.
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