Evaluación de la pesquería multiespecífica de charales (Chirostoma spp., Pisces, Atherinidae)del Lago de Pátzcuaro, Michoacán, México

Abstract

AN ASSESSMENT OF THE MULTIESPECIFIC ATHERINIDAE FISH FISHERY OF LAGO DE PATZCUARO, MEXICO, IS DONE BASED ON THEIR ECOLOGICAL CHARACTERISTICS THAT CONFORM THEM AS GUILD. SAMPLING WAS CARRIED MONTHLY USING A HAUL NET DURING AN ANNUAL CYCLE (1988-1989). FISHERY AND POPULATION PARAMETERS WERE ESTIMATED THROUGH LENGTH FREQUENCY ANALYSIS. GROWTH PARAMETERS OF CHIROSTOMA GENUS WERE L00=14.25CM, K=0.179 AND T0=0.444. MORTALITY RATES WERE ESTIMATED ON 0.80, 0.42 AND 0.38 FOR TOTAL, NATURAL AND FISHING MORTALITY, RESPECTIVELY. EXPORTATION RATE FOR THE MULTIESPECIFIC FISHERY WAS 0.475. RECRUITMENT IS PROTRACTED ALMOST ALL THE YEAR WITH TWOM PEAKS IN MAY-AUGUST AND DECEMBER-JANURY.OPTIMAL YIELD PER RECRUIT OF THE FISHERY IN 1988-1989 WAS ESTIMATED ON 1.169 G PER RECRUIT SIMULATION ANALYSIS SUGGEST THAT THE RESOURCE WAS SUBUTILIZED AND A HIGHER YIELD PER RECRUIT OF 1.419 CAN BE ACHIVIEVED IF THE MESH SIZE IS INCREASED.