Spawning aggregations of Merluccius hubbsi, in Patagonian waters: evidence for a single stock?

Giácomo, Edgardo Ernesto Di; Calvo, Jorge; Perier, María Raquel; Morriconi, Elba

doi:10.1016/0165-7836(93)90106-h

Cited by 32 publications

(26 citation statements)

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“…The arrival of males prior to females in spawning areas is common among many fish species (McKenzie, 1940;Chrzan, 1950;Green et al, 1966;Eckmann, 1991;Ridgway et al, 1991). A male-biased sex ratio of M. hubbsi schools, related to the reproductive behaviour of the species, has been observed in the north zone of San Matías Gulf during the reproductive season (Calvo, 1985;Di Giacomo et al, 1993). In the northern Patagonian region, the proportion of males during the reproductive season was higher than females except in January when a large number of older females arrived in the spawning area.…”

Section: Discussionmentioning

confidence: 98%

Reproductive pattern of the Patagonian stock of Argentine hake (Merluccius hubbsi)

2005

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Section: Discussionmentioning

confidence: 98%

Reproductive pattern of the Patagonian stock of Argentine hake (Merluccius hubbsi)

2005

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“…A third small stock is located in the semi-enclosed San Matías Gulf (Di Giácomo et al, 1993). These stocks have different historical exploitation patterns and are managed as separated units (Aubone et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal and ontogenetic changes in the diet of the Argentine hakeMerluccius hubbsi

et al. 2014

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The diet and the trophic level of the Argentine hake Merluccius hubbsi was investigated in the south-west Atlantic Ocean. Stomachs from 3405 specimens, ranging from 10 to 94 cm total length, collected on three research cruises carried out during winter 2011 and summer 2012, were examined at the laboratory. Dietary shifts related to sex, maturity stage, size, age, season, region and hour were examined using generalized linear models. The Argentine hake M. hubbsi fed mainly on zooplankton crustaceans (Themisto gaudichaudii, Euphausia lucens and Munida spp.), followed by fish and cephalopods. During summer, cephalopods (mainly Illex argentinus) were the main prey of M. hubbsi, indicating spatio-temporal changes in the diet. This work also revealed ontogenetic dietary changes associated with size, from zooplankton crustaceans during early life stages (E. lucens, T. gaudichaudii and Munida spp.) to fish and cephalopods. The trophic level of M. hubbsi ranged from 3.43 to 4.51 according to season and region. Cannibalism increased with predator length and contributed a maximum of 8.14% to the diet of M. hubbsi during winter on the inner Patagonian continental shelf.

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“…Desde hace más de tres décadas se desarrolla una pesquería dirigida al complejo de especies demersales y demersal-pelágicas. De acuerdo a sus propiedades oceanográficas y biológicas, se ha sugerido que algunas de las especies forman unidades demográficas diferentes a las existentes en la Plataforma Continental Argentina, como es el caso de la merluza común Merluccius hubbsi, principal especie blanco de la pesquería (Di Giácomo et al, 1993;Sardella & Timi, 2004;González et al, 2007). Esta condición de sistema semi-cerrado del golfo San Matías podría generar escenarios particulares para la interacción entre la flota pesquera de arrastre demersal que opera en el golfo y algunos predadores tope del ecosistema.…”

Section: Introductionunclassified

Solapamiento trofico entre el lobo marino de un pelo Otaria flavescens y la pesqueria de arrastre demersal del golfo San Matias, Patagonia, Argentina

Romero

Dans²,

González

et al. 2011

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RESUMEN.A nivel internacional, paralelo a la declinación y al colapso de pesquerías de gran escala, surgió un interés creciente por el estudio de las interacciones entre mamíferos marinos y pesquerías. El golfo San Matías (Patagonia, Argentina) es considerado un ecosistema pesquero independiente de las aguas de la Plataforma Continental Argentina, con condiciones oceanográficas y biológicas particulares. La condición de sistema semi-cerrado podría generar escenarios particulares para la interacción entre la flota pesquera de arrastre de fondo y la población de lobos marinos de un pelo Otaria flavescens. En el presente trabajo se caracterizó la dieta del predador y la composición de las capturas pesqueras a fin de evaluar el solapamiento trófico entre ambos componentes. A partir de este análisis y la comparación de las tallas de las presas consumidas, se encontró que la posibilidad de una interacción competitiva entre la flota pesquera y los lobos marinos, a partir de la utilización de recursos similares, sería baja en el ecosistema del golfo San Matías. Palabras clave: Otaria flavescens, lobo marino, golfo San Matías, pesquería de arrastre, solapamiento trófico, Patagonia argentina.Trophic overlap between the South American sea lion Otaria flavescens and the demersal trawl fishery in San Matías Gulf, Patagonia, Argentina ABSTRACT. As world fisheries began to decline and massive collapses were observed, the competition between marine mammals and fisheries became an issue of growing concern. San Matías Gulf (Patagonia, Argentina) is considered to be a fishery ecosystem independent of the Argentine Continental Shelf waters, with particular oceanographic and biological properties. As a semi-enclosed ecosystem, this gulf may generate particular scenarios for interactions between the demersal trawl fishery fleet and the population of South American sea lions Otaria flavescens. In this paper, the diet of the top predator and the composition of fishery catches were characterized in order to assess the trophic overlap between these two components. This analysis and a comparison of the sizes of prey consumed revealed a low probability of competition for similar resources between the fishing fleet and the marine mammals in the San Matías Gulf ecosystem.

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Spawning aggregations of Merluccius hubbsi, in Patagonian waters: evidence for a single stock?

Cited by 32 publications

References 1 publication

Reproductive pattern of the Patagonian stock of Argentine hake (Merluccius hubbsi)

Reproductive pattern of the Patagonian stock of Argentine hake (Merluccius hubbsi)

Spatio-temporal and ontogenetic changes in the diet of the Argentine hakeMerluccius hubbsi

Solapamiento trofico entre el lobo marino de un pelo Otaria flavescens y la pesqueria de arrastre demersal del golfo San Matias, Patagonia, Argentina

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