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THE WESTERN PACIFIC BRACHYURAN HEMIGRAPSUS SANGUINEUS (GRAPSIDAE) IN ITS NEW HABITAT ALONG THE ATLANTIC COAST OF THE UNITED STATES: REPRODUCTION

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ABSTRACT The Asiatic crab Hemigrapsus sanguineus, originally found as a single specimen in a rocky intertidal location in New Jersey in 1988, now has a geographical range in the western Atlantic from Massachusetts to North Carolina. In New Jersey, the crab reproduces from late April through September, and laboratory observations revealed that some crabs produce at least 2 broods in a season. Ovigerous females ranged from 12.1-35.8 mm in carapace width (CW), but relatively few females were sufficiently developed to reproduce at the lower end of this range. The abdominal width/CW ratio must be ≥0.60 for female crabs to be considered mature. Analysis of 300 females ≥12.0 mm CW revealed that crabs ≥17.0 mm are likely to be mature. The mean time required for embryo development to hatching of zoeae in the laboratory at 19-20°C was 22.3 ± 1.8 days (range 20-25 days; N = 8). Viable second broods produced in the laboratory did not require a second copulation. The number of embryos in broods of H. sanguineus was positively correlated with CW (N = 50), with some crabs ovipositing >40,000 eggs.

10.2307/1549324
/content/journals/10.2307/1549324
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/content/journals/10.2307/1549324
2017-09-22

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