Abstract
Argentine Shortfin Squid (<i>Illex argentinus</i>) Stock Assessment in the Southwest Atlantic Using Geostatistical Techniques
Highlights
The Argentine shortfin squid Illex argentinus is commonly distributed in the Southwest Atlantic (SWA) from 22 - 54°S, and is concentrated between 35 and 52°S along a 200-m isobath (Brunetti and Ivanovic 1992; Leta 1992; Jereb and Roper 2010)
The annual squid abundance distribution patterns were categorized into 3 groups, namely high, ordinary, and low, according to the annual abundance index (Fig. 2)
Box-and-whisker plots revealed a few outliers within specific year, for instance lower ones in high abundance year 1999, and higher ones in low abundance year 2004
Summary
The Argentine shortfin squid Illex argentinus is commonly distributed in the Southwest Atlantic (SWA) from 22 - 54°S, and is concentrated between 35 and 52°S along a 200-m isobath (Brunetti and Ivanovic 1992; Leta 1992; Jereb and Roper 2010). The precise Argentine shortfin squid identification from its sympatric congeners was improved using morphometric tools and beak characteristics (Martínez et al 2002). The Argentine shortfin squid biology has been well-studied and a summary can be found in the reports published by Brunetti et al (1998a) and Haimovici et al (1998). The Argentine shortfin squid is a semelparous. Argentine shortfin squid is suggested to spawn throughout the year (Rodhouse and Hatfield 1990; Rodhouse et al 1995). The winter spawners form the most prevalent group, of which two geographic stocks, i.e., the Bonaerensis-North Patagonia (BNPS) and the south Patagonia stocks (SPS), are recognized (Brunetti et al 1998a; Haimovici et al 1998)
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