Gladius and statolith as tools for age and growth studies of the squid Loligo plei (Teuthida: Loliginidae) off southern Brazil

Abstract

Statolith and gladius were investigated for their suitability as tools for age and growth studies in the loliginid squid

Benthic community structure and organic matter variation in response to oceanographic events on the Brazilian SE inner shelf

“…The statoliths of D. plei described here seemed to be very similar to those described by Perez et al (2006) for squid caught off the Santa Catarina coast. In the strata of both populations, the statolith area was characterised by having a prominent dorsal and lateral dome, but in juvenile squid, this area was more rounded and smaller.…”

“…In the strata of both populations, the statolith area was characterised by having a prominent dorsal and lateral dome, but in juvenile squid, this area was more rounded and smaller. However, the size of the specimens analysed in our study (range: 25-291 mm; average: 112.06 mm) was smaller than those sampled by Perez et al (2006); range: 35-342 mm.…”

“…Previous SL-ML relationships for the species have also been described by the logarithmic function, but with poorer fits (Aguiar 2002;Perez et al 2006). In the southwestern Atlantic Ocean, for the Illex argentinus squid, the power function showed the best fit for the relationship between SL and ML (Brunetti and Ivanovic 1991).…”

“…In Brazil, statoliths have been used for studies of age and growth of some species, such as Doryteuthis plei caught off the Santa Catarina coast (25-29°S) through the reading of growth increments on polished statoliths (Aguiar 2002;Perez et al 2006). Hence, the statolith morphometrics were preliminarily used to establish relationships between statolith length and mantle length (Aguiar 2002).…”

Morphology and morphometry ofDoryteuthis plei(Cephalopoda: Loliginidae) statoliths from the northern shelf off São Paulo, southeastern Brazil

“…Age and growth estimates can be obtained by identifying and interpreting growth increments deposited in statoliths (Villanueva et al 2003;Boyle and Rodhouse 2005;Perez et al 2006). …”