RESEARCH PAPER
Growth rates of the chokka squid Loligo reynaudii d’Orbigny, 1845 (Cephalopoda: Myopsida: Loliginidae) off South Africa, investigated over two years
 
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1
National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources, Swakopmund, Namibia
2
Department of Ichthyology and Fisheries Science, Rhodes University, South Africa
3
Branch, Fisheries Management, Department of Environment, Forestry and Fisheries, Cape Town, South Africa
4
South African Institute of Aquatic Biodiversity (SAIAB), Grahamstown, South Africa
CORRESPONDING AUTHOR
Marek R. Lipiński   

Department of Ichthyology and Fisheries Science, Rhodes University, P.O. Box 94, 6140 Grahamstown, South Africa
Submission date: 2021-03-22
Final revision date: 2021-06-14
Acceptance date: 2021-06-23
Online publication date: 2021-07-11
 
 
KEYWORDS
ABSTRACT
Growth of adult chokka squid Loligo reynaudii d’Orbigny was modelled using mantle length and age data derived from samples collected over two years (2003 and 2004) from a single, large cohort of mature and spawning squid. A total of 588 statoliths were examined (310 males, 278 females) from individuals of 71–425 mm mantle length (ML). The maximum size of chokka squid was 425 mm ML for males and 263 mm ML for females. The Francis Growth Model and Linear Growth model were selected for further analysis from six models considered. Males and females attain similar ages, although mantle length-based daily growth rates ranged from 0.75 to 1.02 (0.88 quantile _50) mm/day for males and 0.32–0.45 (0.38 quantile _50) mm/day for females, explaining the sexual dimorphism apparent in the sizes of individuals of this species.
 
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