Abundance and population structure of the blue crab Callinectes sapidus (Decapoda, Portunidae) in Thermaikos Gulf (Methoni Bay), northern Aegean Sea
| Autor: | Chryssanthi Antoniadou, Kosmas Kevrekidis |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
geography education.field_of_study geography.geographical_feature_category Callinectes biology 010604 marine biology & hydrobiology Crab fisheries Population Estuary 04 agricultural and veterinary sciences Aquatic Science biology.organism_classification 01 natural sciences Fishery Mediterranean sea Abundance (ecology) 040102 fisheries 0401 agriculture forestry and fisheries Animal Science and Zoology education Portunidae Bay |
| Zdroj: | Crustaceana. 91:641-657 |
| ISSN: | 1568-5403 |
| DOI: | 10.1163/15685403-00003795 |
| Popis: | The blue crabCallinectes sapidusis an alien decapod established in the Mediterranean Sea. Since 2007, increased abundance has been reported from the northern Aegean Sea sustaining local scale fishery. The present work aims to assess the abundance and population structure ofC. sapidusin Thermaikos Gulf using fyke nets. Population abundance, estimated as CPUE, exhibited strong temporal variability with decreased values in the cold season; this pattern was correlated with seawater temperature. Females exhibited also spatial differences with increased abundance close to the Aliakmon estuary. In total, 543 individuals were measured for carapace width. Males prevailed in the population; however, mean size was similar between sexes. Larger individuals were caught from deeper waters and the estuarine areas, whereas mean size decreased temporally. The fyke nets used proved to be size-selective, thus preventing fisheries mortality for juveniles. However, recurrent monitoring is necessary for a sustainable management of blue crab fisheries in the gulf. |
| Databáze: | OpenAIRE |
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