Distribution and abundance of early life stages of squid (Illex argentinus) in the south-west Atlantic

Brunetti, Norma E.; Ivanovic, Marcela L

doi:10.1093/icesjms/49.2.175

Cited by 46 publications

(40 citation statements)

References 6 publications

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“…Illex argentinus migrates between spawning grounds in the northern Patagonian shelf and feeding grounds in the south. The SPS is thought to spawn in the austral winter in the waters of either the Falkland Current (Brunetti & Ivanovic 1992, Leta 1992, Rodhouse et al 1995 or the Brazil Current (Hatanaka 1988). The eggs are carried towards the subtrop~cal confluence (Hatanaka 1986, 1988, Haimovici et al 1998 and are thought to develop in the waters of the Brazil Current.…”

Section: Introductionmentioning

confidence: 99%

Influence of oceanographic variability on recruitment in the Illex argentinus (Cephalopoda:Ommastrephidae) fishery in the South Atlantic

Waluda¹,

Trathan²,

Rodhouse³

1999

Mar. Ecol. Prog. Ser.

124

114

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'~e p a r t m e n t of Zoology, University of Aberdeen. Tillydrone Avenue, Aberdeen AB24 2TZ, United Kingdom ABSTRACT: The fishery for IUex argentinus in the Southwest Atlantic is subject to large inter-annual variability in recruitment strength. In this paper we attempt to build a predictive model using sea surface temperature (SST) to examine links between recruitment to the Falkland Islands fishery and environmental variability during the juvenile and adult life history stages. SST data from the National Center for Atmospheric Research (NCAR) were found to be comparable with near-surface data derived from in situ expendable bathy-thermograph (XBT) profiles in the southern Patagonian shelf. Variation in SST during the early Me stages appears to be important in determining recruitment of I. argentinus.SST in the hatching grounds of the northern Patagonian shelf during the period of hatching (particularly June and July) was negatively correlated with catches in the fishery in the following season. SST anomaly data from positions in the Pacific and Southwest Atlantic were used to examine teleconnections between these areas. Links were seen at a lag of 2 yr between the Pacific and southern Patagonian shelf, and at about 5 yr between the Pacific and northern Patagonian shelf. This is consistent with SST anomalies associated with El Nifio in the Pacific propagating around the globe via the Antarctic Circumpolar Wave (ACW). Predicting cold events via teleconnections between SST anomalies in the Pacific and Atlantic would appear to have the potential to predict the recruitment strength of I. argentinus in the Southwest Atlantic.

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Section: Introductionmentioning

confidence: 99%

Influence of oceanographic variability on recruitment in the Illex argentinus (Cephalopoda:Ommastrephidae) fishery in the South Atlantic

Waluda¹,

Trathan²,

Rodhouse³

1999

Mar. Ecol. Prog. Ser.

124

114

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“…I. argentinus is widely distributed across the Patagonian Shelf and adjacent oceanic waters between 22 and 54°S Chen 2005, Chen et al 2008b).The population structure of I. argentinus is complex and based on length at maturity, area and timing of spawning, and the distribution of early juveniles and adult life stages, divided into four stocks: the South Patagonia Stock (SPS), the Bonaerensis-Northpatagonia Stock, the Summer Spawning Stock and the Southern Brazil Stock (Hatanaka 1986). The Falkland Islands fishery consists almost exclusively of winter spawners and fishery managers assume that it target a single stock (SPS) south of 45°S (Brunetti and Ivanovic 1992). China (Lu and Chen 2013), Chinese Taipei (Chen and Chiu 2009) and the Falkland Islandshave exploited the SPS cohort of I. argentinus since 2000 (Waluda et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Environmental influences on commercial oceanic ommastrephid squids: a stock assessment perspective

et al. 2017

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Summary:Ommastrephid squids are short-lived ecological opportunists and their recruitment is largely driven by the surrounding environment. While recent studies suggest that recruitment variability in several squid species can be partially explained by environmental variability derived from synoptic oceanographic data, assessment of ommastrephid stocks using environmental variability is rare. In thisstudy, we modified asurplus production model to incorporate environmental variability into the assessment of threeommastrephid squids (Ommastrephes bartramii in the northwest Pacific, Illex argentinus in the southwest Atlantic and Dosidicus gigas in the southwest Pacific). We assumed that the key environmental variablessuitable sea surface temperature on spawning grounds during the spawning seasons and feeding grounds during the feeding seasons-have effects on the carrying capacity and the instantaneous population growth rate, respectively, in the surplus production model. For each squid stock, the assessment model with environmental variability had the highest fitting accuracy and the lowest mean squared error and coefficient of variation, and the management reference points based on the optimal model were more precautionary. This study advances our understanding of the interactions between the environment and ommastrephid squid population dynamics and can therefore improve the management of these commercially valuable stocks with a short life cycle.Keywords: Ommastrephid squids; Ommastrephes bartramii; Illex argentinus; Dosidicus gigas; stock assessment; environmental factors.Influencia de factores ambientales sobre potas oceánicas (Cephalopoda: Ommastrephidae) explotadas comercialmente: un enfoque para la gestión de stocks Resumen: Los miembros de la familia Ommastrephidae (potas) son cefalópodos de vida breve y oportunistas ecológicos, estando sus reclutamientos profundamente influidos por el ambiente circundante. Aunque algunos estudios recientes sugirieron que la variabilidad del reclutamiento en varias especies de esta familia podría explicarse parcialmente por la variabilidad ambiental derivada de datos oceanográficos sinópticos, la gestión de los stocks de omastréfidos empleando factores medioambientales es muy poco frecuente. En el presente trabajo, se ha modificado un modelo de producción generalizada incorporando en él factores ambientales con objeto de ofrecer una herramienta para la gestión y manejo de tres pesquerías: la de Ommastrephes bartramii en el Pacífico Noroeste, la Illex argentinus en el Atlántico sudoeste y la de Dosidicus gigas en el Pacífico sudoeste. Se asumió que los factores ambientales clave: una apropiada temperatura superficial en las áreas de puesta durante las épocas de freza y en las áreas de alimentación durante las estaciones de nutrición, tenían efectos sobre la capacidad de carga y el crecimiento instantáneo de la tasa de crecimiento de la población, respectivamente, en el modelo de producción generalizada. Para el stock de cada especie, el modelo de gestión con las variables a...

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“…The southward-flowing Brazil current dominates the northern part of the region while the northwardflowing Malvinas (Falkland) current affects the southern part (Olson et al, 1988). According to several authors (Brunetti & Ivanovic, 1992;Haimovici et al, 1998;Waluda et al, 2001), their confluence, near the mouth of La Plata River, generate oceanographic conditions that support embryonic and paralarvae development.…”

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confidence: 99%

“…Additionally, the presence of juveniles reveals the existence of a populational unit (Summer Spawning Stock) spawning on the mid-shelf (Brunetti & Ivanovic, 1992;Haimovici et al, 1998).…”

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confidence: 99%

“…It has been demonstrated that several areas along mid and outer shelf off Argentina present physical and biological conditions such that they act as spawning and nursery grounds (e.g. tidal frontal zones) (Brunetti, 1990;Brunetti & Ivanovic, 1992;Haimovici et al, 1998;Waluda et al, 2001;Rivas et al, 2006;Romero et al, 2006). In contrast, efforts directed to determine if near-shore waters are suitable habitats for early-life stages of the species have been sparse and unsuccessful in detecting their presence (Brunetti & Ivanovic, 1992;Leta, 1992;Haimovici et al, 1998).…”

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confidence: 99%

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On the presence of Illex argentinus (Castellanos, 1960) (Cephalopoda:Ommastrephidae), paralarvae and juveniles in near shore waters of Nuevo Gulf, Argentina

Crespi-Abril

Dellatorre

Barón

2010

LAJAR

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ABSTRACT. In this study we report the presence of paralarvae and juveniles of Illex argentinus in the waters of Nuevo Gulf (42°45'S-64°45'W, Argentina) during three consecutive years (2004)(2005)(2006)(2007). Paralarvae were caught using a Hensen net of 295 µm mesh size. Juveniles were found stranded on the coast in September 2007. These findings show that the species uses near-shore waters for breeding.

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Distribution and abundance of early life stages of squid (Illex argentinus) in the south-west Atlantic

Cited by 46 publications

References 6 publications

Influence of oceanographic variability on recruitment in the Illex argentinus (Cephalopoda:Ommastrephidae) fishery in the South Atlantic

Influence of oceanographic variability on recruitment in the Illex argentinus (Cephalopoda:Ommastrephidae) fishery in the South Atlantic

Environmental influences on commercial oceanic ommastrephid squids: a stock assessment perspective

On the presence of Illex argentinus (Castellanos, 1960) (Cephalopoda:Ommastrephidae), paralarvae and juveniles in near shore waters of Nuevo Gulf, Argentina

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