Population and catch structure of the edible crab (Cancer pagurus) in the English Channel

Brown, C. G.; Bennett, David

doi:10.1093/icesjms/39.1.88

Cited by 41 publications

(43 citation statements)

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“…Haefner (1978) reported that the Armstrong-Reproduction of Ovalipes catharus 535 lack of mature ovaries in female Geryon quinquedens in November corresponded to a peak of ovigerous females at that time which suggested that most females had extruded their eggs. Similarly, peak abundance of ovigerous female Cancer pagurus coincided with the greatest percentage of females with undeveloped ovaries (Brown & Bennett 1980). Gonad index analysis also showed a spread in reproductive activity in female 0. catharus over 4-5 months.…”

Section: Discussionmentioning

confidence: 80%

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Reproduction in the paddle crabOvalipes catharus(Decapoda: Portunidae) from Blueskin Bay, Otago, New Zealand

Armstrong

1988

New Zealand Journal of Marine and Freshwater Research

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Reproduction was investigated in the paddle crab (Ovalipes catharus) in Blueskin Bay, Otago, from March 1984 to April 1985. From oocyte size-frequency analysis it appeared that one clutch of oocytes was developed and spawned completely. No evidence of multiple spawning using sperm from a single copulation was found. Seasonal ovarian development and the presence of ovigerous females showed that spawning occurred from September to February inclusive. However, few ovigerous females were caught during sampling. No spermatogenic cycles were observed in males and they appeared to be able to copulate at any time. Size at first sexual maturity was estimated on the basis of gonadal condition and relative growth to occur at a carapace width of 55-65 mm. O. catharus from Wellington and Canterbury were estimated to mature at a smaller size than those in Blueskin Bay. This difference may be caused by decreasing water temperature associated with increasing latitude.

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Section: Discussionmentioning

confidence: 80%

“…The peak for females probably occurs at the time of copulation and then 5-6 months elapse before spawning. This is not unusual among the Brachyura and a delay of 2 to 9 months, and 12 months occurs for Callinectes sapidus (Van Engel 1958) and Cancerpagurus (Brown & Bennett 1980), respectively.…”

Section: Discussionmentioning

confidence: 92%

Reproduction in the paddle crabOvalipes catharus(Decapoda: Portunidae) from Blueskin Bay, Otago, New Zealand

Armstrong

1988

New Zealand Journal of Marine and Freshwater Research

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“…Larger individuals (>l20 mm CW) that will moult once, or less than once, in a season (Hancock & Edwards 1967) will probably not do so until the food availability has been sufficiently high to allow adequate feeding. Excluding immature (prepubescent) crabs, Edwards (1979), Brown & Bennett (1980 and Karlsson & Christiansen (1996) all report that the peak in the moulting period occurs earlier in females than males. Higher numbers of large males onshore throughout most of the moulting season may indicate male polygamy, as shown in laboratory studies by Edwards (1966), and a tendency for males to hold back their moult until most of the females have moved to offshore waters to find sediment suitable for the spawning of their eggs.…”

Section: Discussionmentioning

confidence: 99%

Epidemiology and dynamics of shell disease in the edible crab Cancer pagurus:a preliminary study of Langland Bay, Swansea, UK

Vogan¹,

Llewellyn²,

Rowley³

1999

Dis. Aquat. Org.

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The prevalence and severity of shell disease in the edible crab Cancer pagurus (L.) was investigated in animals collected from Langland Bay, Gower, South Wales, UK, at monthly intervals from 1997 to 1998. Shell disease is the progressive degradation of exoskeletal chitin accompanied by melanisation of the affected region. Over 50% of the crabs sampled had 1 or more black-spot lesions. The proportion of exoskeleton affected increased with the size of the crab. Male crabs showed significantly higher levels of the disease than females, a higher prevalence of black-spot lesions (63% in males, 40% in females) and a higher mean percentage of body covered by lesions (1 % in males, 0.2% in females). This difference between the sexes corresponded to an increase in ventral surface and chela infection in males. For both sexes, the dorsal carapace was the area most affected by the disease. Dorsal carapace regional breakdown revealed the areas most commonly affected were located to the posterior of the crab. Lesion location patterns suggested that sand abrasion injuries during back-burrowing behaviour of C. pagurus lead to the formation of shell disease lesions. Seasonal trends in shell disease were seen to be dependent on the onshore migration patterns of the different size classes and sexes over the sampling period.

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“…For round goby the weight-length relationship was found to be weight=5 * 10 −6 standard length 3.2458 (R 2 =0.9856) calculated from data in Almqvist et al (unpubl. data), whereas, relationships for invertebrate prey organisms were found in the literature (Ankar and Elmgren 1976;Mauchline 1977;Brown and Bennett 1980;Rumohr et al 1987;ICES CM 2000).…”

Section: Stomach Analysesmentioning

confidence: 92%

Has the invasive round goby caused new links in Baltic food webs?

2010

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Population and catch structure of the edible crab (Cancer pagurus) in the English Channel

Cited by 41 publications

References 0 publications

Reproduction in the paddle crabOvalipes catharus(Decapoda: Portunidae) from Blueskin Bay, Otago, New Zealand

Reproduction in the paddle crabOvalipes catharus(Decapoda: Portunidae) from Blueskin Bay, Otago, New Zealand

Epidemiology and dynamics of shell disease in the edible crab Cancer pagurus:a preliminary study of Langland Bay, Swansea, UK

Has the invasive round goby caused new links in Baltic food webs?

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