| Autor: |
NAFKHA, Basma, ROCHA, Francisco, BEN ABDALLAH-BEN HADJ HAMIDA, Olfa, BEN HADJ HAMIDA, Nader, CHEMMAM, Bachra, VELASCO, Cristina, EZZEDDINE-NAJAI, Soufia, JARBOUI, Othman |
| Rok vydání: |
2019 |
| DOI: |
10.21411/cbm.a.de35b895 |
| Popis: |
Age and growth of Octopus vulgaris were estimated for the first time by using stylets of 200 specimens (97 males, 103 females) collected from the Tunisian southern coasts (the Gulf of Gabès), between June 2011 and May 2012. Females ranged in age from 215 days (7.5 months) to a maximum of 889 days (29.6 months), corresponding to weights of 380 to 5800 g. Males ranged in age from 102 days (3.4 months) to a maximum of 1251 days (41.7 months), corresponding to weights of 280 to 6350 g. A strong positive relationship between estimated age and both dorsal mantle length and body weight was observed. Our results indicated that under favourable conditions the life cycle of Octopus vulgaris could be extended to 2.5 years for most of the population and exceptionally to 3.5 years for some males in the Tunisian waters. Our data provided also a high growth individual variability and suggest the existence of octopus sub-annual cohorts which hatch through the year. The highest growth rate for both sexes was observed for individuals hatched in summer. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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