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Age structure and life cycles of the Argentine shortfin squid Illex argentinus (Cephalopoda: Ommastrephidae) in southern Brazil

Published online by Cambridge University Press:  25 April 2012

R. Schwarz  and
J.A.A. Perez
R. Schwarz*
Affiliation:
Grupo de Estudos Pesqueiros (GEP), Centro de Ciências Tecnológicas da Terra e do Mar, Universidade do Vale do Itajaí, Rua Uruguai, 458 Centro, Itajaí, SC, Brasil
J.A.A. Perez
Affiliation:
Grupo de Estudos Pesqueiros (GEP), Centro de Ciências Tecnológicas da Terra e do Mar, Universidade do Vale do Itajaí, Rua Uruguai, 458 Centro, Itajaí, SC, Brasil
*
Correspondence should be addressed to: R. Schwarz, Grupo de Estudos Pesqueiros (GEP) Centro de Ciências Tecnológicas da Terra e do Mar, Universidade do Vale do Itajaí, Rua Uruguai, 458 Centro, Itajaí, SC, Brasil email: [email protected]
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Abstract

Age structure and hatchling dates of the squid Illex argentinus collected by bottom-trawl fishery in southern Brazilian waters were assessed by the analysis of statolith growth increments. Catches occurred between 2001 and 2002, from 23° to 32°S at depths of 100–700 m. Squid from juvenile to post-spawning stages were collected year round, with age estimated from 98 to 320 days and mantle lengths ranging from 112 to 376 mm. Duration of life cycle events based on statolith growth zones revealed that squids can spend about 14% of their lifespan as paralarva (~30 days), 70% as juvenile (~130 days), leaving maturity and spawning condition to the terminal 10–20% (~30–60 days). The results suggest that, unlike estimates available for Patagonian populations, a general 0.5 year lifespan is predicted for I. argentinus off Brazil. The wide range of size-at-ages implied that catches of shortfin squid off southern Brazil probably include squid hatched throughout the year. Mature and spawning squid caught in summer months hatched in winter and spring, while winter catches revealed mature-spawning individuals hatched both in summer/autumn (~6 months of age) and winter/spring periods (~10–11 months of age). It has been argued that such groups may combine both squid resident of Brazilian outer shelf and slope (22°–34°S) with a six months' lifespan and migrating squid originated from the northern Patagonian shelf (~42°S) with 10–11 months' lifespan.

Keywords

Illex argentinusstatolithsagepopulation structuresouthern Brazil
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Special Issue 2: Fish and Fisheries , March 2013 , pp. 557 - 565
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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