In tropical countries, a large number of finfish species and invertebrates are captured as by-catch, including several species of crustaceans, due to the low selectivity of the fishing methods. By-catch presents and optimal opportunity to study populations of crustaceans. Here, the goal was to determine the community structure, specifically through the size structure, as well as the average sizes at first maturity of crustacean species present in the shrimp by-catch caught aboard a fishing vessel operating in the Mexican Pacific, from Sinaloa to Guerrero, Mexico. From the 18 crustaceans found in this study, the crabs Euphylax robustus and Achelous asper were the dominant species, whereas four species were considered casual (i.e., not frequent). Interestingly, more than 40% of the organisms analysed were in the juvenile stage, and 19% were ovigerous females. The results demonstrate the negative impact of the low selectivity of shrimp trawls on the communities of species of Crustacea.

The shrimp fishery is one of the most important fisheries in the world, although the low selectivity from trawling nets has led to the capture of a large number of non-target species. Shrimp-bycatch species include a large number of fish and invertebrate species, of which fish species are the most abundant. The present study aims to determine the community structure as well as the average sizes at first maturity of the fish species from shrimp-bycatch caught from industrial fisheries in the Mexican Pacific from Sinaloa to Guerrero, from January to March 2015. The shrimp-bycatch fish diversity value was found to be 2.22. A total of 37 species of finfish were found, of which five were considered rare. The fish species with the highest Importance Value Index (IVI) levels were Pseudupeneus grandisquamis, Paralichthys woolmani, Lutjanus peru and Diapterus peruvianus. The average size at first maturity was calculated for all species. Of the analysed organisms, 90% were in the juvenile stage, including species with riverine and artisanal fisheries. The present study demonstrates the risk within marine populations to different non-target species due to the poor selectivity of shrimp trawls.

Reproduction and community structure of fish from winter shrimp bycatch from the Southeast Gulf of California Shrimp fishery is one of the most important fisheries of the world. However, the low selectivity from trawl nets leads the capture of a large number of non-target species.Shrimp bycatch include a large number of fish and invertebrate species; of which fish species are the most abundant. The present study aims to determine the community structure as well as the average sizes at first maturity of the fish species from shrimp bycatch caught from industrial fisheries at the southeast of the Gulf of California from Sinaloa to Guerrero, Mexico; from January to March 2015. A total of 37 species of finfish were found; of which five were considered rare. Shrimp fishery is one of the most important fisheries of the world. However, the low selectivity 19 from trawl nets leads the capture of a large number of non-target species. Shrimp bycatch include 20 a large number of fish and invertebrate species; of which fish species are the most abundant. The 21 present study aims to determine the community structure as well as the average sizes at first 22 maturity of the fish species from shrimp bycatch caught from industrial fisheries at the southeast 23 of the Gulf of California from Sinaloa to Guerrero, Mexico; from January to March 2015. A total 24 of 37 species of finfish were found; of which five were considered rare. The fish species with the 25 highest Importance Value Index (IVI) were Pseudupeneus grandisquamis, Paralichthys 26 woolmani, Lutjanus peru y Diapterus peruvianus. The average size at first maturity of 12 fish 27 species was determined; nine of which have not been previously reported. Of the analyzed 28 organisms 90% were in juvenile stage; including species with riverine and artisanal fisheries. 29 The present study demonstrates the risk in marine populations of different non-target species due 30 to the low selectivity of shrimp trawls.

Reproduction and community structure of fish from winter catch sites from industrial shrimp bycatch from the northeast and southeast Mexican Pacific.PeerJ 6:e4460 https://doi.org/10.7717/peerj.4460Reproduction and community structure of fish from winter shrimp bycatch from the Southeast Gulf of California Shrimp fishery is one of the most important fisheries of the world. However, the low selectivity from trawl nets leads the capture of a large number of non-target species.Shrimp bycatch include a large number of fish and invertebrate species; of which fish species are the most abundant. The present study aims to determine the community structure as well as the average sizes at first maturity of the fish species from shrimp bycatch caught from industrial fisheries at the southeast of the Gulf of California from Sinaloa to Guerrero, Mexico; from January to March 2015. A total of 37 species of finfish were found; of which five were considered rare. Shrimp fishery is one of the most important fisheries of the world. However, the low selectivity 19 from trawl nets leads the capture of a large number of non-target species. Shrimp bycatch include 20 a large number of fish and invertebrate species; of which fish species are the most abundant. The 21 present study aims to determine the community structure as well as the average sizes at first 22 maturity of the fish species from shrimp bycatch caught from industrial fisheries at the southeast 23 of the Gulf of California from Sinaloa to Guerrero, Mexico; from January to March 2015. A total 24 of 37 species of finfish were found; of which five were considered rare. The fish species with the 25 highest Importance Value Index (IVI) were Pseudupeneus grandisquamis, Paralichthys 26 woolmani, Lutjanus peru y Diapterus peruvianus. The average size at first maturity of 12 fish 27 species was determined; nine of which have not been previously reported. Of the analyzed 28 organisms 90% were in juvenile stage; including species with riverine and artisanal fisheries. 29 The present study demonstrates the risk in marine populations of different non-target species due 30 to the low selectivity of shrimp trawls.31 Key words. Community structure, Length of maturity, Finfish, Shrimp bycatch.PeerJ Preprints | https://doi.org/10.7287/peerj.preprints.3274v1 | CC BY 4.0 Open Access |