The Antarctic Oscillation index as an environmental parameter for predicting catches of the Argentine shortfin squid (Illex argentinus) Cephalopoda: Ommastrephidae) in southwest Atlantic waters

The jumbo flying squid Dosidicus gigas is a highly migratory species distributed throughout the Eastern Pacific Ocean. An integrated habitat suitability index (HSI) model was developed to evaluate the effects of climate variability (i.e. El Niño-Southern Oscillation) on the habitat suitability for D. gigas in the Southeast Pacific Ocean off Peru. The data used in the analysis included catch and fishing effort from the Chinese squid-jigging fishery over 2006-2013, as well as remotely sensed environmental data including sea surface temperature, chlorophyll a and sea surface height anomaly. Arithmetic mean HSI model was shown to have a better predictive performance and used to predict the HSI values and identify the suitable habitat for D. gigas over 2006-2012. Fishery and environmental data in 2013 was used to validate the model. The latitudinal location of suitable habitat was found to be important in determining the distribution of fishing efforts. Cross-correlation plot exhibited a significantly negative relationship between the average HSI values on the fishing ground and the Niño 3.4 indices with time-lags from 21 to 3 months, implying that the squid habitat responded quickly to the climate variability. Both suitable habitat areas and catches of D. gigas increased in La Niña periods and decreased in El Niño periods. The La Niña conditions tended to strengthen upwelling coupled with cool and nutrient-enhanced waters, which yielded favourable habitat conditions and high catches; whereas the El Niño conditions weakened upwelling coupled with warm and nutrient-depleted waters, which were unfavourable for squid habitat and reduced catches. Our findings indicated that large-scale climate variabilities could have great effects on squid habitat and such variabilities could be quantified by climate indices such as Oceanic Niño index.

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“…Oscillation index could be used as crucial environmental parameters to predict squid habitat quality (Chen et al, 2007;Chang et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Modelling the effects of climate variability on habitat suitability of jumbo flying squid,Dosidicus gigas, in the Southeast Pacific Ocean off Peru

Qian

Chen

et al. 2015

ICES J. Mar. Sci.

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“…Conversely, as represented by the lowabundance year 2004, the spherical structure of the squid abundance was preserved under the condition of a relative low-value domain. Cooler subsurface seawater temperatures are crucial for the high Argentine shortfin squid abundance (Chang et al 2015). The Argentine shortfin squid aggregates in the cold water area along the convergence of the Brazilian and Falkland currents (Chen et al 2005) and forages in the Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…However, intensive data collection is required to achieve the proposed management target for sustainable fishery. Another approach for estimating squid abundance involves establishing empirical, heuristic models that relate squid abundance to environmental factors such as sea surface temperature (SST), sea bottom temperature, sea surface salinity, and atmospheric forcing (Pierce and Boyle 2003;Robinson et al 2013;Chang et al 2015). Oceanographic conditions have been reported to explain variability in squid abundance and distribution patterns (Waluda et al 1999(Waluda et al , 2001a(Waluda et al , b, 2004Agnew et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Argentine Shortfin Squid (Illex argentinus) Stock Assessment in the Southwest Atlantic Using Geostatistical Techniques

Chang¹,

Chen²,

Chiu³

et al. 2016

Terr. Atmos. Ocean. Sci.

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The spatial and temporal variation in Argentine shortfin squid Illex argentinus abundance distribution was examined over its fishing phase on the Patagonia Shelf and shelf break, Southwest Atlantic (SWA), using Taiwanese jigger's fishery data. Geostatistical techniques were applied to characterize the spatial and temporal variability in the squid abundance and its relation to seawater temperature. The experimental semivariograms indicated that the abundance of Argentine shortfin squid was spatially structured in the SWA, with various abundance levels. The spherical models for all years, except 2010, explained most spatial information from the annual squid abundance distribution patterns. The linear regression analysis confirmed a negative relationship between the annual squid abundance and seawater temperature in the studied years. High squid abundance was estimated using Kriging interpolations along the 200-m isobath from 40°S to as far south as 50°S. The elliptical isopleth lines extended a longer distance from the 200-m isobath to the shelf side in high abundance years, such as 1999 and 2007. Scattered patches of low values were observed in the very low-abundance year of 2004. The integrated total squid biomass using Kriging interpolation upheld a healthy stock status in the SWA fishing ground. Our research showed that the geostatistical procedure is effective in describing the annual spatial pattern, and the parameters resulting from stationary modeling are valuable and useful in estimating the annual total biomass in the realized fishing ground.

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“…Because I. argentinus is a semelparous species, and their generations do not overlap, we employed catch per unit effort (CPUE) of the jigging fleet as a surrogate for annual recruitment, as in other ommastrephid squids recruitment studies (Chang et al., 2015; Waluda et al., 2001; Wang et al., 2018). Fishery data of the international fleet targeting SPS are not available, so we employed data of the argentine and charted vessels that fished this stock over the continental shelf and slope between 44° and 54°S.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of the Confluence of Malvinas and Brazil currents, and a southern Patagonian spawning ground, explain recruitment fluctuations of the main stock of Illex argentinus

Alberto

Bodnariuk

Ivanovic

et al. 2020

Fisheries Oceanography

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The Argentine shortfin squid (Illex argentinus) sustains one of the world's largest squid fisheries. This squid presents strong interannual fluctuations in abundance, attributed to its semelparous life strategy coupled with environmental influences on recruitment. Several stocks have been identified, but the south patagonic stock (SPS) is the most abundant and the main support (ca. 80%) of the Argentine fishery. SPS spawns in autumn–winter, but there are controversies regarding the spawning ground location. We studied the relationship between the recruitment variability and oceanographic conditions to which eggs and paralarvae are exposed, considering two possible spawning ground locations: Patagonia and Southern Brazil. We tested the hypothesis that the SPS recruitment variability could be controlled by oceanographic fluctuations related to the transport of the egg masses spawned on each of the two grounds, to their retention on the continental shelf and to the attainment of the thermal habitat required for eggs hatching. We used a 24‐ years long time series (1993–2017) of catch per unit effort of the squid fishery, and a shorter stock‐assessment series as recruitment proxies; and satellite data of SST and of geostrophic velocities derived from sea surface height. This information was employed to model the advection of the squid egg masses along the external shelf and slope and to estimate the annual recruitment success. Results show that if spawning occurs in Patagonia, 52% of the recruitment variability could be explained. On the other hand, if spawning occurs in southern Brazil, it does not result in successful recruitments for the SPS.

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The Antarctic Oscillation index as an environmental parameter for predicting catches of the Argentine shortfin squid (Illex argentinus) Cephalopoda: Ommastrephidae) in southwest Atlantic waters

Abstract: Abstract-With data from Taiwan-

Cited by 8 publications

References 29 publications

Modelling the effects of climate variability on habitat suitability of jumbo flying squid,Dosidicus gigas, in the Southeast Pacific Ocean off Peru

Modelling the effects of climate variability on habitat suitability of jumbo flying squid,Dosidicus gigas, in the Southeast Pacific Ocean off Peru

Argentine Shortfin Squid (Illex argentinus) Stock Assessment in the Southwest Atlantic Using Geostatistical Techniques

Dynamics of the Confluence of Malvinas and Brazil currents, and a southern Patagonian spawning ground, explain recruitment fluctuations of the main stock of Illex argentinus

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