Size Structure and Biomass of the Panama Grunt (Pomadasys panamensis) from Bycatch inthe Southeastern Gulf of California

Abstract

A population analysis was made using data of the grunt Pomadasys panamensis. The information is from the catch from 260 hauls in estuarine waters, open-ocean waters, and off the coast of Sinaloa and northern Nayarit, Mexico, in the southeastern Gulf of California. The area of influence is about 120,000 km2 and includes about a third of the drag area of the largest shrimp fleet of the American Pacific. The average length in the population was 210 mm. The maximum length was 430 mm and the minimum was 50 mm. The analysis for the frequency distributions of the lengths and the multinomial solution produced representative modal groups for 160 mm, 190 mm, and 230 mm. The simulation of the biomass density gave an estimate close to 90 t, with 650,000 organisms before starting the fishing season in the region. The density was 0.19 kg ha–1. The colonization was 0.42% or 42 %. The model was validated using the Aikaikae criterion (AIC). The results provide an overview of the initial biomass densities and population structure of the species caught as bycatch, demonstrating the importance of this species abundance in the shrimp fishery, and generating a source of monetary income to the crew of the fishing fleet. The persistence of the species to fishing provides an example to study the mechanisms of survival

Catch, bycatch and discards of the Galapagos Marine Reserve small-scale handline fishery

“…Contrary to a common concern raised by the fishers, the reduction of fishing pressure on threatened target species does not necessarily have to be accompanied by a reduction of income. For example, integrating more resilient, faster growing non-target species in landings has been successfully adopted in a number of fisheries worldwide ( Lobo et al, 2010 ; Rodríguez-Preciado, Madrid-Vera & Meraz-Sánchez, 2012 ). In the Mexican Pacific, bycatch species of the family Haemulidae such as Pomadasys panamensis have become an important part of the commercial catch from the fisheries ( Rodríguez-Preciado, Madrid-Vera & Meraz-Sánchez, 2012 ).…”

“…For example, integrating more resilient, faster growing non-target species in landings has been successfully adopted in a number of fisheries worldwide ( Lobo et al, 2010 ; Rodríguez-Preciado, Madrid-Vera & Meraz-Sánchez, 2012 ). In the Mexican Pacific, bycatch species of the family Haemulidae such as Pomadasys panamensis have become an important part of the commercial catch from the fisheries ( Rodríguez-Preciado, Madrid-Vera & Meraz-Sánchez, 2012 ). The fact that many species which presently are commonly consumed in the Galapagos handline fishery have often been discarded during previous decades indicates a certain flexibility and ability by the fishing sector and the consumer community to adapt to changes in their environment.…”

Catch, bycatch and discards of the Galapagos Marine Reserve small-scale handline fishery

“…For example, integrating more resilient, faster growing non-target species in landings was successfully adopted in a number of fisheries worldwide (Lobo et al, 2010;Rodríguez-Preciado, Madrid-Vera & Meraz-Sánchez, 2012). In the Mexican Pacific, bycatch species of the family Haemulidae such as Pomadasys panamensis have become an important part of the commercial catch from the fisheries (Rodríguez-Preciado, Madrid-Vera & Meraz-Sánchez, 2012). The fact that many species which presently are commonly consumed in the Galapagos handline fishery were often discarded during last decades indicates a certain flexibility and ability by the fishing sector and the consumer community to adapt to changes in their environment.…”

Geographic Variation in the Reproductive Ecology of the Panamic Grunt in the Southeastern Gulf of California

“…; Rodríguez‐Preciado et al. , ). Fishery regulation for this species is nonexistent in the Mexican Pacific, and information on population ecology, demographic parameters, and gonad investment that could form the basis for species management is lacking.…”

“…; Rodríguez‐Preciado et al. ). According to the National Commission for Fisheries and Aquaculture of Mexico (CONAPESCA), reported landings of the Panamic Grunt in the SGC constitute approximately 32% of the total catch in the Mexican Pacific.…”