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Study of the growth of Octopus vulgaris in the Moroccan Mediterranean Sea by direct age estimation through the analysis of upper beaks

Published online by Cambridge University Press:  27 April 2023

Ahmed Faiki Open the ORCID record for Ahmed Faiki [Opens in a new window] ,
Hicham Chairi ,
Mohammed Malouli Idrissi  and
Jilali Bensbai
Ahmed Faiki*
Affiliation:
Research team in Biological Engineering, Food Processing and Aquaculture, Polydisciplinary Faculty of Larache, B.P 745, Main Post 92000, Abdelmalek Essaadi University, Tetouan, Morocco
Hicham Chairi
Affiliation:
Research team in Biological Engineering, Food Processing and Aquaculture, Polydisciplinary Faculty of Larache, B.P 745, Main Post 92000, Abdelmalek Essaadi University, Tetouan, Morocco
Mohammed Malouli Idrissi
Affiliation:
National Fisheries Research Institute (INRH), Regional Centre of Tangier, P.O. Box 5268, Tangier, Morocco
Jilali Bensbai
Affiliation:
National Fisheries Research Institute (INRH), Bd Sidi Abderrahmane 2, Ain Diab, Casablanca, Morocco
*
Corresponding author: Ahmed Faiki; E-mail: ahmed.faiki@mpm.gov.ma
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Abstract

Beaks are one of the most important sclerochronological structures used to study the age and growth of cephalopods, in particular Octopus vulgaris Cuvier, 1797. The present study provides results of ageing of 128 O. vulgaris (56–239 mm dorsal mantle length, DML; 121–5974 g total weight, TW) collected in the southern Moroccan Mediterranean coasts between Fnideq and Jebha. The number of increments corresponding to the age (days since hatching) varied from 137–368 in females and from 129–382 in males. There was a significant correlation between beak and somatic growth. The correlation coefficients of the growth curves DML-Age and TW-Age were similar for both power and exponential models: DML = 0.185Age1.188 (R2 = 0.547), DML = 35.933e0.005Age (R2 = 0.546), TW = 0.00002Age3.260 (R2 = 0.532), TW = 29.56e0.014Age (R2 = 0.541). The average width of the increments was similar between females and males. It varied significantly with season and stage of sexual maturity. Comparison of the growth curve with those estimated by other authors showed that Moroccan Mediterranean O. vulgaris grew faster than that of Sardinia (Italy) and slower than that of the Mauritanian coast.

Keywords

Age studybeakscorrelationgrowth curvegrowth incrementsOctopus vulgaris
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 103 , 2023 , e33
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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