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Seasonal population dynamics of Octopus vulgaris in the eastern Mediterranean
Authors
S. Katsanevakis Verriopoulos, G.
Publication date
1 January 2006
Publisher
Abstract
The population density of Octopus vulgaris was measured by visual census with scuba diving in coastal areas in Greece (eastern Mediterranean). A time-variant, stage-classified, matrix population model was developed to interpret the seasonal variation of octopus stage densities and to estimate several life cycle parameters. An annual and a semi-annual periodic cycle were found in the stage densities. A main peak of benthic settlement was observed during summer and a secondary, irregular one during late autumn. Two spawning peaks were estimated, a main one during late winter-spring and a secondary one during late summer-early autumn. More than 50% of the just-settled individuals will eventually die after 3 months. Mortality rate declines, as individuals grow larger, reaches a minimum approximately 6 months after settlement, and then grows again probably because of terminal spawning. The life expectancy of recently settled individuals (<50 g) during their summer peak is approximately 5 months. The lifespan of the common octopus is estimated to be between 12 and 15 months. The octopuses' mean specific growth rates (±s.d.) in their natural environment were 1.61 ± 0.30 d -1 for 50-200 g individuals and 1.19 ± 0.31 d-1 for 200-500 g individuals. © 2005 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All rights reserved
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Last time updated on 10/02/2023