Food Habits of Crabs in Ise Bay, Central Japan.

Narita, Teruyoshi; Sekiguchi, Hideo

doi:10.5179/benthos.57.1

Cited by 4 publications

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“…Previous studies on the biology of C. bimaculata have reported the morphological characteristics of the zoea and megalopa (Hwang and Kim, 1995), the growth, spawning season, and size of sexual maturity of females in the Seto Inland Sea (Ogawa, 1998), the stomach contents in Ise Bay (Narita and Sekiguchi, 2002), cheliped handedness (Lee, 1995;Yamaguchi and Tokunaga, 1995), and genetic relationships with other species (Heo et al, 2003). There are numerous reports on the population biology of other portunid crabs, but most of them are limited to large-sized and/or commercially important species.…”

Section: Introductionmentioning

confidence: 99%

“…In Japan, this crab is found predominantly in inner bays (Kubo and Asada 1957;Ogawa, 1998;Narita and Sekiguchi, 2002;Narita et al, 2003;Doi et al 2004), where it inhabits the sandy bottom between the intertidal and depths up to 439 m (Miyake, 1998). This species is a common by-catch in the small beam trawling for an edible mantis shrimp in Tokyo Bay, but is discarded because of its small size (Miyake, 1998) and the lack of commercial value.…”

Section: Introductionmentioning

confidence: 99%

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Growth and Reproduction of the Portunid Crab Charybdis Bimaculata (Decapoda: Brachyura) in Tokyo Bay

Doi

Yokota²,

Strüssmann

et al. 2008

Journal of Crustacean Biology

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A B S T R A C TThe abundance, sex ratio, growth, sexual maturity, morphological sex dimorphism, and reproduction of the portunid crab Charybdis bimaculata was studied in Tokyo Bay, Japan, between November 2002 and October 2003. Relative abundance [inferred from catch-perunit-effort (CPUE)] was higher and lower during summer and winter months, respectively. The proportion of males varied between 0.2-0.5 throughout the year and the overall sex ratio was greatly biased toward females. The population had a unimodal size frequency distribution and the life-span was estimated to be about one year. Growth was not depressed in winter and was adequately described by the von Bertalanffy growth equation. The puberty molt in males brought about changes in the relative size of the chelipeds and gonopods and was estimated to occur within a carapace length (CL) range of 12.50-16.00 mm. Puberty in females was evidenced by a sharp increase in the pleon width and was estimated to occur at CLs between 11.34 and 16.74 mm. Morphological sexual dimorphism was observed in all features which showed secondary sexual development (cheliped dimensions, carapace and pleon width, and body weight). Ovarian development was uniformly arrested only during winter but began developing in early spring, and mating (insemination) increased in frequency between spring and summer. Ovigerous females were found in all seasons except for winter, but were more common during the warmer months. Batch fecundity ranged from 8,300 to 38,400 eggs per female and was positively correlated with body size. C. bimaculata displays the typical reproductive features and spawning pattern of temperate portunid crabs in spite of its short life-span.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Growth and Reproduction of the Portunid Crab Charybdis Bimaculata (Decapoda: Brachyura) in Tokyo Bay

Doi

Yokota²,

Strüssmann

et al. 2008

Journal of Crustacean Biology

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“…It is important to know the population dynamics of this crab for successful use of fishery resources in order to clarify the megabenthos community structure in Ise Bay, central Japan. Based on short-term observations, seasonal variations in the abundance and biomass, spawning season, sex ratio 2,11 and food habits of the crab 14 have been reported, whereas those based on long-term observations have been reported only by Hossain 5 and Narita et al 6 According to these studies, 5,6 the abundance and biomass of the crab decreased in summer when oxygen-poor water developed in the central or inner parts of the bay, and then increased from autumn to the following spring when the oxygen-poor water disappeared. To clarify the population dynamics of the crab in the bay, it is necessary to examine its migration or larval recruitment events in relation to the development/disappearance of the oxygen-poor water in the bay, based on detailed observations through the life cycle of the crab.…”

Section: Introductionmentioning

confidence: 99%

Population dynamics of portunid crab Charybdis bimaculata in Ise Bay, central Japan

2008

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The present study dealt with seasonal and interannual variations in the abundance and biomass, and spatio-temporal distributions of the portunid crab Charybdis bimaculata dominant in Ise Bay, central Japan. The abundance and biomass of the crab decreased in summer when the oxygen-poor water developed in central or inner parts of the bay, and then increased through new recruits from autumn (October-November) to the following spring (March-May) when the oxygenpoor water disappeared. Berried females were collected mainly from spring to autumn. Recruits were collected in any season. Particularly in winter, most recruits were located in the innermost part of the bay. According to the cohort separation based on size frequency distribution in carapace width of the crab specimens, the cohorts that were derived from spawning in spring to summer largely contributed to establishing and maintaining the benthic populations for the following year in the bay, whereas those from other seasons failed to recruit because of serious damage caused by the oxygen-poor water. Most crab individuals one year post hatch contributed to spawning and then died by the winter of the same year.

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Oocyte and embryonic development, size at sexual maturity, and spawning season of Charybdis bimaculata

2022

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Food Habits of Crabs in Ise Bay, Central Japan.

Cited by 4 publications

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Growth and Reproduction of the Portunid Crab Charybdis Bimaculata (Decapoda: Brachyura) in Tokyo Bay

Growth and Reproduction of the Portunid Crab Charybdis Bimaculata (Decapoda: Brachyura) in Tokyo Bay

Population dynamics of portunid crab Charybdis bimaculata in Ise Bay, central Japan

Oocyte and embryonic development, size at sexual maturity, and spawning season of Charybdis bimaculata

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