Journal
OCEANOLOGIA
Volume 56, Issue 4, Pages 805-824Publisher
POLISH ACAD SCIENCES INST OCEANOLOGY
DOI: 10.5697/oc.56-4.805
Keywords
North American; Harris mud crab; Introduced; Crustacean; Invasive; Poland; Condition factor
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Funding
- Polish National Science Centre [3016/B/P01/2011/40]
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The aim of this study was to characterise the introduced North American Harris mud crab Rhithropanopeus harrisii, which occurs in the Gulf of Gdansk, Poland (southern Baltic Sea). Of the 920 specimens caught between 2006 and 2010, males and females made up 44 and 40% respectively, whereas juveniles (< 4.4 mm carapace width) comprised 16%. Overall carapace widths ranged from 1.96 mm to 21.40 mm (mean 9.03 +/- 4.11 mm) Ovigerous females (mean 11.12 +/- 2.76 mm) were present in the population from June to October. Most of the adult specimens collected (n = 158) had carapace widths between 10.1 and 12.0 mm. The wet weight of R. harrisii varied from 0.005 to 4.446 g (mean 0.410 +/- 0.569 g). Females exhibited a negative allometric increase in weight (b = 2.77), males an isometric increase in weight (b = 3.02). The condition factor (K) in R. harrisii varied from 0.02 to 0.08 (mean 0.05 +/- 0.01).
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