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The views and opinions expressed or implied in this article are those of the author (or authors) and do not necessarily reflect the position of the National Marine Fisheries Service, NOAA. Abstract—The red deepsea crab (Chaceon quinquedens) supports a small fishery of <2000 metric tons annually along the U.S. East Coast, but little is known about the life history of this crab. We sampled red deepsea crab from 4 sites and 3 depth strata (250–450 m, 450–700 m, and 700–850 m) in the Mid-Atlantic Bight in January 2011 and 2012 and in July 2013. Crab size decreased with depth, whereas shell age indices increased with depth. Crab occurred at temperatures from 4.6°C to 10.6°C (mean: 6.37°C) and there was little difference between sexes. Size at 50% maturity (SM50) could not be determined with chela or abdomen allometry, but SM50 was estimated at 61.6 mm in carapace length for females on the basis of gonopore condition. Sex ratios (M:F) involving female crab above the SM50 were <0.5, indicating that large males are depleted in comparison with female abundance. The proportion of ovigerous females was 33% in January 2012 and <6% in July 2013, proportions that support the hypothesis of a biennial (or longer) reproductive cycle. Red deepsea crab probably recruit to deep water (>1000 m), move upslope during adolescence, and become mature in the shallowest strata, before undergoing an ontogenetic migration back to intermediate depths. The red deepsea crab (Chaceon quinquedens) ranges from the Gulf of Maine to the Gulf of Mexico, at depths from 200 to 1800 m, and temperatures of 5–8°C (Haefner and Musick, 1974; Wigley et al., 1975; Serchuk1; Steimle et al., 2001; Wahle et al., 2008; NEFSC2). Stocks along the Atlantic coast are considered a single population and distinct from the stock in the Gulf of Mexico. Red deepsea crab support a small but valuable fishery in federally managed waters along the continental slope of southern New England and the Mid-Atlantic, a fishery that has

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Depth and temperature distribution, morphometrics, and sex ratios of red deepsea crab (Chaceon quinquedens) at 4 sampling sites in the Mid-Atlantic Bight