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Claudia S Bremec - One of the best experts on this subject based on the ideXlab platform.
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Are hakes truly opportunistic feeders? A case of prey selection by the Argentine hake Merluccius hubbsi off southwestern Atlantic
Fisheries Research, 2019Co-Authors: Mauro Belleggia, Brenda Temperoni, Gustavo Álvarez-colombo, Nadia Marina Alves, Melisa Mariana Leyton, Diego Giberto, Claudia S BremecAbstract:Abstract Prey selection and feeding strategy of the Argentine hake Merluccius hubbsi were investigated by analyzing the diet and prey availability in the main nursery area of the Patagonian stock (42.4°–46.4 °S, 70–102 m depth). Stomach contents from fish captured using a bottom Trawl Net, and zooplankton samples collected with a Bongo Net, were analyzed. Acoustic data were examined to identify pelagic aggregations and quantify relative prey abundance. The Argentine hake M. hubbsi fed mainly on crustaceans (92.7%IRI), followed by fish (7.1%IRI) and cephalopods (0.2%IRI). Among crustaceans, the diet was dominated by euphausiids ( Euphausia spp.), the lobster krill Munida gregaria , and the hyperiid amphipod Themisto gaudichaudii . The most consumed fish was other hake by cannibalism. Prey availability was also numerically dominated by the euphausiids ( Euphausia spp.), followed by the hyperiid amphipod T. gaudichaudii and the lobster krill M. gregaria . OntogeNetic dietary changes were detected: consumption of euphausiids and amphipods decreased with predator´s total length, and the consumption of the lobster krill M. gregaria was higher in adult specimens. The Argentine hake M. hubbsi showed positive prey selection for lobster krill M. gregaria. The consumption of Euphausiids decreased with the increasing acoustic abundance of the lobster krill M. gregaria. The cannibalism was denso-independent. The Argentine hake appeared to be opportunistic when the proportion of prey eaten to the proportion present in the environment was compared, but deeper analyses confirmed that zooplankter with increased abundances and higher energy density was the preferred prey.
H Aguirrevillasenor - One of the best experts on this subject based on the ideXlab platform.
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effect of the artisanal shrimp fishery on the ichthyofauna in the coastal lagoon of santa maria la reforma southeastern gulf of california
Ciencias Marinas, 2006Co-Authors: Felipe Amezcua, Juan Madridvera, H AguirrevillasenorAbstract:Se evaluo el impacto de la pesca artesanal de camaron sobre la fauna de peces en el sistema lagunar de Santa Maria la Reforma. Para ello, se muestrearon diariamente, durante cinco dias, 29 estaciones a lo largo del sistema lagunar, con los artes de pesca utilizados en el area de estudio para capturar camaron, que fueron la red de arrastre, la red agallera y la red suripera. Los muestreos fueron mensuales de diciembre de 2001 a mayo de 2002. Se recolectaron un total de 11,368 organismos correspondientes a 173 especies. Las especies mas importantes en cuanto a abundancia y biomasa incluyeron organismos de interes comercial tales como Eucinostomus entomelas, Sphoeroides annulatus, Urotrygon chilensis y Diapterus peruvianus. La mayor abundancia y biomasa de organismos, de acuerdo con el bootstrapping del estimador log normal, fue capturada con la red de arrastre. El promedio de la longitud de los peces capturados fue de 17.4 cm para la red agallera, 15.8 cm para la red de arrastre y 13.4 cm para la suripera. Los artes de pesca que presentaron un mayor impacto sobre la comunidad de peces fueron la red de arrastre y la red agallera, ya que estas dos artes capturaron la mayor abundancia, biomasa y diversidad de peces, entre los que se incluyen una gran cantidad de organismos de tallas pequenas. Estos dos artes capturaron peces del fondo asi como de la columna de agua, ademas fueron las que presentaron la menor proporcion en kg pez:camaron; la red de arrastre capturo una proporcion de 6:1, la red agallera capturo una proporcion de 15:1, mientras que la red suripera capturo una proporcion de 1:1. The effect of the artisanal shrimp fishery on the fish fauna in the coastal lagoon of Santa Maria la Reforma, Mexico, was assessed. Twenty-nine stations were sampled monthly for shrimp and fin fish during six months, from December 2001 to May 2002, using small boats fitted with outboard engines and the three fishing gears employed by shrimp fishermen in the area: small shrimp Trawl Net, gillNet, and suripera Net. Each sampling period lasted five days. In total, 11,368 individuals were caught, comprising 173 fish species. The species best represented in terms of number and biomass included the commercially important species Eucinostomus entomelas, Sphoeroides annulatus, Urotrygon chilensis, and Diapterus peruvianus. The highest abundance and biomass, as determined by boostrapping of the lognormal-based estimator, were caught with the shrimp Trawl Net. The mean total length of the fish captured was 17.4 cm for the gillNet, 15.8 cm for the shrimp Trawl Net, and 13.4 cm for the suripera Net. The fishing gear that had a greater impact on the fish fauna were the shrimp Trawl Net and the gillNet, because they caught the greatest number of fish, biomass and diversity, and a large quantity of small individuals. These two fishing gears caught fish fauna from both the bottom and the water column, and showed the lowest fish/shrimp ratio in kilograms. The shrimp Trawl Net caught a 6:1 ratio, the gillNet a 15:1 ratio, and the suripera Net a 1:1 ratio.
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efecto de la pesca artesanal de camaron sobre la ictiofauna en el sistema lagunar de santa maria la reforma suroeste del golfo de california effect of the artisanal shrimp fishery on the ichthyofauna in the coastal lagoon of santa maria la reforma southeastern gulf of california
2006Co-Authors: Felipe Amezcua, Juan Madridvera, H AguirrevillasenorAbstract:The effect of the artisanal shrimp fishery on the fish fauna in the coastal lagoon of Santa Maria la Reforma, Mexico, was assessed. Twenty-nine stations were sampled monthly for shrimp and fin fish during six months, from December 2001 to May 2002, using small boats fitted with outboard engines and the three fishing gears employed by shrimp fishermen in the area: small shrimp Trawl Net, gillNet, and suripera Net. Each sampling period lasted five days. In total, 11,368 individuals were caught, comprising 173 fish species. The species best represented in terms of number and biomass included the commercially important species Eucinostomus entomelas, Sphoeroides annulatus, Urotrygon chilensis, and Diapterus peruvianus. The highest abundance and biomass, as determined by boostrapping of the lognormal-based estimator, were caught with the shrimp Trawl Net. The mean total length of the fish captured was 17.4 cm for the gillNet, 15.8 cm for the shrimp Trawl Net, and 13.4 cm for the suripera Net. The fishing gear that had a greater impact on the fish fauna were the shrimp Trawl Net and the gillNet, because they caught the greatest number of fish, biomass and diversity, and a large quantity of small individuals. These two fishing gears caught fish fauna from both the bottom and the water column, and showed the lowest fish/shrimp ratio in kilograms. The shrimp Trawl Net caught a 6:1 ratio, the gillNet a 15:1 ratio, and the suripera Net a 1:1 ratio.
Felipe Amezcua - One of the best experts on this subject based on the ideXlab platform.
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incidental capture of juvenile fish from an artisanal fishery in a coastal lagoon in the gulf of california
North American Journal of Fisheries Management, 2009Co-Authors: Felipe Amezcua, Juan Madridvera, Hugo AguirreAbstract:Abstract Fishing gear used in artisanal penaeid shrimp fisheries in the southwestern Gulf of California usually consists of the Trawl Net, gill Net, and suripera Net. These Net types are known to capture a high quantity of fish bycatch and are likely to cause high levels of juvenile fish mortality. However, juvenile bycatch mortality has not been documented in previous studies. The aim of this work was to study the effect of a local artisanal shrimp fishery on the juvenile fish community in the coastal lagoon of Santa Maria la Reforma, Sinaloa, Mexico. Length at first maturity was estimated for the seven most abundant species; based on this information, a generalized linear model and a Bayesian approach were used to estimate the probabilities of juvenile fish capture for different types of fishing gear. We found that the three Net types captured juveniles, even those of species maturing at small lengths, and were likely to impact the recruitment of the analyzed species, as the probability of juvenile capt...
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effect of the artisanal shrimp fishery on the ichthyofauna in the coastal lagoon of santa maria la reforma southeastern gulf of california
Ciencias Marinas, 2006Co-Authors: Felipe Amezcua, Juan Madridvera, H AguirrevillasenorAbstract:Se evaluo el impacto de la pesca artesanal de camaron sobre la fauna de peces en el sistema lagunar de Santa Maria la Reforma. Para ello, se muestrearon diariamente, durante cinco dias, 29 estaciones a lo largo del sistema lagunar, con los artes de pesca utilizados en el area de estudio para capturar camaron, que fueron la red de arrastre, la red agallera y la red suripera. Los muestreos fueron mensuales de diciembre de 2001 a mayo de 2002. Se recolectaron un total de 11,368 organismos correspondientes a 173 especies. Las especies mas importantes en cuanto a abundancia y biomasa incluyeron organismos de interes comercial tales como Eucinostomus entomelas, Sphoeroides annulatus, Urotrygon chilensis y Diapterus peruvianus. La mayor abundancia y biomasa de organismos, de acuerdo con el bootstrapping del estimador log normal, fue capturada con la red de arrastre. El promedio de la longitud de los peces capturados fue de 17.4 cm para la red agallera, 15.8 cm para la red de arrastre y 13.4 cm para la suripera. Los artes de pesca que presentaron un mayor impacto sobre la comunidad de peces fueron la red de arrastre y la red agallera, ya que estas dos artes capturaron la mayor abundancia, biomasa y diversidad de peces, entre los que se incluyen una gran cantidad de organismos de tallas pequenas. Estos dos artes capturaron peces del fondo asi como de la columna de agua, ademas fueron las que presentaron la menor proporcion en kg pez:camaron; la red de arrastre capturo una proporcion de 6:1, la red agallera capturo una proporcion de 15:1, mientras que la red suripera capturo una proporcion de 1:1. The effect of the artisanal shrimp fishery on the fish fauna in the coastal lagoon of Santa Maria la Reforma, Mexico, was assessed. Twenty-nine stations were sampled monthly for shrimp and fin fish during six months, from December 2001 to May 2002, using small boats fitted with outboard engines and the three fishing gears employed by shrimp fishermen in the area: small shrimp Trawl Net, gillNet, and suripera Net. Each sampling period lasted five days. In total, 11,368 individuals were caught, comprising 173 fish species. The species best represented in terms of number and biomass included the commercially important species Eucinostomus entomelas, Sphoeroides annulatus, Urotrygon chilensis, and Diapterus peruvianus. The highest abundance and biomass, as determined by boostrapping of the lognormal-based estimator, were caught with the shrimp Trawl Net. The mean total length of the fish captured was 17.4 cm for the gillNet, 15.8 cm for the shrimp Trawl Net, and 13.4 cm for the suripera Net. The fishing gear that had a greater impact on the fish fauna were the shrimp Trawl Net and the gillNet, because they caught the greatest number of fish, biomass and diversity, and a large quantity of small individuals. These two fishing gears caught fish fauna from both the bottom and the water column, and showed the lowest fish/shrimp ratio in kilograms. The shrimp Trawl Net caught a 6:1 ratio, the gillNet a 15:1 ratio, and the suripera Net a 1:1 ratio.
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efecto de la pesca artesanal de camaron sobre la ictiofauna en el sistema lagunar de santa maria la reforma suroeste del golfo de california effect of the artisanal shrimp fishery on the ichthyofauna in the coastal lagoon of santa maria la reforma southeastern gulf of california
2006Co-Authors: Felipe Amezcua, Juan Madridvera, H AguirrevillasenorAbstract:The effect of the artisanal shrimp fishery on the fish fauna in the coastal lagoon of Santa Maria la Reforma, Mexico, was assessed. Twenty-nine stations were sampled monthly for shrimp and fin fish during six months, from December 2001 to May 2002, using small boats fitted with outboard engines and the three fishing gears employed by shrimp fishermen in the area: small shrimp Trawl Net, gillNet, and suripera Net. Each sampling period lasted five days. In total, 11,368 individuals were caught, comprising 173 fish species. The species best represented in terms of number and biomass included the commercially important species Eucinostomus entomelas, Sphoeroides annulatus, Urotrygon chilensis, and Diapterus peruvianus. The highest abundance and biomass, as determined by boostrapping of the lognormal-based estimator, were caught with the shrimp Trawl Net. The mean total length of the fish captured was 17.4 cm for the gillNet, 15.8 cm for the shrimp Trawl Net, and 13.4 cm for the suripera Net. The fishing gear that had a greater impact on the fish fauna were the shrimp Trawl Net and the gillNet, because they caught the greatest number of fish, biomass and diversity, and a large quantity of small individuals. These two fishing gears caught fish fauna from both the bottom and the water column, and showed the lowest fish/shrimp ratio in kilograms. The shrimp Trawl Net caught a 6:1 ratio, the gillNet a 15:1 ratio, and the suripera Net a 1:1 ratio.
Paola Betti - One of the best experts on this subject based on the ideXlab platform.
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Daylight vertical segregation of young-of-the-year Argentine hake Merluccius hubbsi: Advances in assessment of juvenile abundance with acoustic methods
Fisheries Research, 2014Co-Authors: G Álvarez-colombo, Claudia Dato, L. Machinandiarena, F Castro-machado, Paola BettiAbstract:Abstract Assessing juvenile Argentine hake stocks from the area swept by bottom-Trawls has systematically produced underestimates, given the adult population levels recruited from them. To gain insight into the behavior and vertical distribution of first-year Argentine hake, acoustic data and both pelagic and bottom-Trawl Net samples were collected in the nursery ground of the southern stock. Five surveys were carried out in the austral winters and summers from June 2011 to February 2013. Daylight echograms at 38 kHz showed horizontally extended aggregations of young-of-the-year (YOY) hake as layers 10–20 m thick separated from the seabed at average distances of 15–20 m in winter and 10–15 m in summer. They were above the reach of the bottom Trawl Nets routinely used in hake assessments. While close agreement of total length distributions was found between Net samples and acoustic fish-track data in the juvenile's first winter, only the smaller fraction of the bimodal distribution shown by the acoustic data was present in pelagic Trawl catches six months later, in the following summer. That suggests the larger fish can avoid the survey Nets. Detection and assessment with acoustic methods allowed determination of the mean densities and horizontal distribution patterns of early juveniles in their main nursery ground. The mean juvenile densities obtained with acoustic methods were above one order of magnitude higher than those obtained by bottom Trawls using the swept-area method.
Mauro Belleggia - One of the best experts on this subject based on the ideXlab platform.
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Are hakes truly opportunistic feeders? A case of prey selection by the Argentine hake Merluccius hubbsi off southwestern Atlantic
Fisheries Research, 2019Co-Authors: Mauro Belleggia, Brenda Temperoni, Gustavo Álvarez-colombo, Nadia Marina Alves, Melisa Mariana Leyton, Diego Giberto, Claudia S BremecAbstract:Abstract Prey selection and feeding strategy of the Argentine hake Merluccius hubbsi were investigated by analyzing the diet and prey availability in the main nursery area of the Patagonian stock (42.4°–46.4 °S, 70–102 m depth). Stomach contents from fish captured using a bottom Trawl Net, and zooplankton samples collected with a Bongo Net, were analyzed. Acoustic data were examined to identify pelagic aggregations and quantify relative prey abundance. The Argentine hake M. hubbsi fed mainly on crustaceans (92.7%IRI), followed by fish (7.1%IRI) and cephalopods (0.2%IRI). Among crustaceans, the diet was dominated by euphausiids ( Euphausia spp.), the lobster krill Munida gregaria , and the hyperiid amphipod Themisto gaudichaudii . The most consumed fish was other hake by cannibalism. Prey availability was also numerically dominated by the euphausiids ( Euphausia spp.), followed by the hyperiid amphipod T. gaudichaudii and the lobster krill M. gregaria . OntogeNetic dietary changes were detected: consumption of euphausiids and amphipods decreased with predator´s total length, and the consumption of the lobster krill M. gregaria was higher in adult specimens. The Argentine hake M. hubbsi showed positive prey selection for lobster krill M. gregaria. The consumption of Euphausiids decreased with the increasing acoustic abundance of the lobster krill M. gregaria. The cannibalism was denso-independent. The Argentine hake appeared to be opportunistic when the proportion of prey eaten to the proportion present in the environment was compared, but deeper analyses confirmed that zooplankter with increased abundances and higher energy density was the preferred prey.
