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Age and growth analysis of Loliginidae squid paralarvae in the NW Spanish coast using statolith increment counts
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Age and growth analysis of Loliginidae squid paralarvae in the NW Spanish coast using statolith increment counts
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Age and growth analysis of Loliginidae squid paralarvae in the NW Spanish coast using statolith increment counts
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Journal Article
Age and growth analysis of Loliginidae squid paralarvae in the NW Spanish coast using statolith increment counts
2024
Overview
Knowledge of recruitment to a fishery is particularly important in short-lived species, like most cephalopods, in which there is a complete turnover of individual every 1 or 2 years. In this study, age, body length, statolith length and growth rates of loliginid paralarvae (
Alloteuthis media
,
A. subulata
and
Loligo vulgaris
) were determined to evaluate the form of the growth curve and differences between species and hatching seasons. A total of 222 paralarvae collected in zooplankton samples along the Galician coast (NW Spain) were used to determine relationships between dorsal mantle length (DML), statolith length (SL) and the number of increments (NI)) deposited in the statolith. The paralarvae of
L. vulgaris
were between 1 and 35 days old, while both
Alloteuthis
species ranged in age from 1 to 54 days
.
Generalised additive models (GAMs) revealed non-linear growth in DML, with
L. vulgaris
exhibiting higher DML-at-age than
Alloteuthis
species. The best parametric model fit for these data was obtained using exponential regressions. The SL–NI relationship also differed between species, with
L. vulgaris
having larger statolith length at age
.
The paralarvae of
L. vulgaris
and
A. media
had two well-differentiated hatching peaks, one in late spring-early summer (beginning of the upwelling season) and another peak in late autumn (end of the upwelling season).
Alloteuthis subulata
had an earlier hatching peak in spring than in the other two loliginid species—and the second peak in autumn was barely visible, possibly because this species occurs further north in areas not sampled in autumn.
