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1
Content available remote Gonad maturity in female Chinese mitten crab Eriocheir sinensis from the southern Baltic Sea : the first description of ovigerous females and the embryo developmental stage
Wójcik D., Normant M.
Oceanologia
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2014
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No. 56 (4)
779--789
EN
This paper describes for the first time the gonad maturity stage of Eriocheir sinensis females (carapace width 55.20-78.10 mm) collected in the autumns and winters of 2005–2012 in the Gulf of Gdańsk and Vistula Lagoon (southern Baltic Sea). Seventeen females had gonads in the penultimate stage, which indicates that spawning would shortly take place. Four other females had gonads in the last stage, which means they were already carrying eggs. These accounted, on average, for 17.9± 2.9% of female weight and were in the 3rd and 4th embryo developmental stage. The results show that the low salinity of southern Baltic Sea (≤7 PSU) permits mating and fertilization as well as embryo development in E. sinensis. It is still not clear, whether such a salinity level will enable hatching and the complete larval cycle.
2
Content available remote Epibiotic mites associated with the invasive Chinese mitten crab Eriocheir sinensis : new records of Halacaridae from Poland
Normant M., Zawal A., Chatterjee T., Wójcik D.
Oceanologia
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2013
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No. 55 (4)
901--915
EN
Seven epibiotic halacarid mites (Caspihalacarus hyrcanus, two species of Copidognathus, Halacarellus petiti, Porohalacarus alpinus, Soldanellonyx monardi and S. chappuisi), two oribatid mites (Hydrozetes lacustris and Trhypochthoniellus longisetus) and one water mite (Piona pusilla) were found on the setae-covered claws of eighteen Chinese mitten crabs (Eriocheir sinensis) collected from fresh and brackish waters in Poland and Germany. The most abundant of the 111 mite individuals recorded was one of the Copidognathus species (N = 52); this was followed by H. petiti (N = 38) and C. hyrcanus (N = 13). This is the first record of H. petiti and of the genus Copidognathus from Polish waters. The possibility of migrating over long distances assisted by catadromous mitten crabs enhances mite dispersal, as well as their introduction to new environments.
3
Content available remote Four pathogens found associated with Eriocheir sinensis H. Milne-Edwards, 1853 (Crustacea: Brachyura: Grapsidae) from Lake Dąbie (Poland) [commun.]
Sobecka E., Hajek G.J., Skorupiński Ł.
Oceanological and Hydrobiological Studies
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2011
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Vol. 40, No.1
96-99
EN
Eriocheir sinensis is a habitat for invertebrates living externally and internally. It may transport native and non-native species to new habitats. Present studies on the Chinese mitten crab from Lake Dąbie add four new taxonomic units to the number of pathogens: Ichthyophonus hoferi, Epistylis sp., Branchiobdella sp. and Digenea gen. sp., which until now have not been found in this host.
4
Content available remote Changes in condition and in carapace length and width of the Chinese mitten crab (Eriocheir sinensis H. Milne Edwards, 1853) harvested in the Odra River estuary in 1999-2007
Czerniejewski P.
Oceanological and Hydrobiological Studies
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2010
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Vol. 39, No.2
25-36
EN
Carapace length and width as well as condition were analysed in 2336 Chinese mitten crabs, Eriocheir sinensis, caught in 1999-2007 in the Odra River estuary (Poland). Their condition was assessed using the Fulton coefficient and the carapace width-individual weight relationship. September through November catches netted the highest number of crabs (83.60% of the total sample); males accounted for 53.56% of the crabs caught at that time. Males showed a significantly higher mean individual weight, significantly higher carapace width and length, and a higher Fulton coefficient than the females. The lowest mean individual weight, carapace width and length, and the highest condition coefficients were recorded in those crabs caught in 1999-2000. Later on, the mean carapace width and individual weight increased, and the increase was accompanied by a reduction in condition of the crabs. Causes of the differences are being sought in environmental changes taking place in the Odra estuary.
5
Content available remote Epibiota associated with setae on Chinese mitten crab claws Eriocheir sinensis H. Milne-Edwards, 1853): a first record [commun.]
Normant M., Korthals J., Szaniawska A.
Oceanologia
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2007
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No. 49 (1)
137-143
EN
Eriocheir sinensis H. Milne-Edwards, 1853 is a non-native species found in European waters. Analyses of mitten crabs caught in brackish waters (Gulf of Gdańsk, Poland) and in freshwater (Havel River, Germany) have indicated that numerous epibionts (possibly temporary) inhabit the dense setal mats that cover the chelipeds. Of the 950 associates found on 22 crabs collected from brackish water, the most abundant were Nematoda (82.3%), followed by Bivalvia (10.3%), Crustacea (5.6%), Oligochaeta (1.2%) and Gastropoda (0.6%). In comparison, 1280 specimens (Chironomidae - 67.6% and Halacaridae - 32.4%), were identified from 13 crabs collected in freshwater. As this crab can migrate long distances, it is capable of transporting native and non-native species via its mittened claws to new habitats.
6
Content available remote A comparative analysis of two allochthonous populations of the Chinese mitten crab (Eriocheir sinensis H. Milne-Edwards, 1853) from the Szczecin Lagoon (NW Poland) and San Francisco Bay (US west coast)
Czerniejewski P., Wawrzyniak W., Pasewicz W., Bełdowska A.
Oceanologia
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2007
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No. 49 (3)
353-367
EN
Selected biological and morphometric characters of two populations of the non-indigenous Chinese mitten crab, one from the Szczecin Lagoon (SL) and the other from San Francisco Bay (SFB), both sampled in autumn, were analysed. The SL crabs showed a significantly higher individual weight, length and carapace width. Males accounted for 55% (87 individuals) of the 179 SL crabs, and 62.9% (90 individuals) of the SFB crabs. Statistical analysis of metric characters, expressed as a percentage of carapace width (X2), enabled four diagnostic characters to be identified: abdomen width (X11), carapace height (X3), left claw length (X7) and carapace length (X1). These jointly explain 71.75% of the differences between the SL and SFB crabs and are indicative of the distinctness of the populations.
7
Content available remote Body weight, condition, and carapace width and length in the Chinese mitten crab (Eriocheir sinensis H. Milne-Edwards, 1853) collected from the Szczecin Lagoon (NW Poland) in spring and autumn 2001
Czerniejewski P., Wawrzyniak W.
Oceanologia
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2006
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No. 48 (2)
275-285
EN
A newcomer to the Baltic Sea, the Chinese mitten crab is especially abundant in the Szczecin Lagoon (NW Poland), where it was first reported in 1927. Body weight, and carapace width and length, were studied in 647 individuals collected with fyke nets in the Szczecin Lagoon from 30 March-18 April 2001 and from 5-21 November 2001. 51.01 of the 543 autumn specimens were males, but only 30.97% of the 113 spring specimens were males. Body weight varied from 45.1 to 306.5 g, carapace length from 41.07 to 81.02 mm and carapace width from 46.68 to 88.85 mm. The autumn crabs were significantly heavier than the spring specimens.
8
Content available remote The Chinese mitten crab Eriocheir sinensis - an immigrant from Asia in the Gulf of Gdańsk [commun.]
Normant M., Chrobak M., Skóra K.
Oceanologia
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2002
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No. 44 (1)
123-125
EN
The present paper reports the occurrence of the Chinese mitten crab Eriocheir sinensis H. Milne Edwards, 1854 in the coastal waters of the Gulf of Gdansk, and attempts an initial characterization of the crabs occurring in this area.
9
Content available remote The Chinese mitten crab Eriocheir sinensis (Decapoda: Grapsidae) from Polish waters [commun.]
Normant M., Wiszniewska J., Szaniawska A.
Oceanologia
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2000
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No. 42 (3)
375-383
EN
The Chinese mitten crab Eriocheir sinensis Milne-Edwards, 1854 is a newcomer to the Baltic Sea. Previous studies have shown that since the 1940s single large specimens of this species have been caught annually in Polish waters. The invasion of the Chinese mitten crab has been reported from many European countries, including Poland, where it is especially abundant in the Odra Estuary. Of 186 specimens captured in Lake Dabie in August 1998, 45% were females and 55\% males. The carapace width of these crabs varied between 53 and 88 mm and the average wet weight was 169 š 45.3 g.
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