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Hymenodora glacialis (Decapoda: Natantia) from the Arctic Basin





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A study was made of the shrimp Hymenodora glacialis (Buchholz) collected from Fletcher's Ice Island from June 1965 to January 1967, when the island drifted over the deep water of the Canada Basin. A vertical distribution was determined by means of horizontal and vertical plankton net hauls, which accounted for most of the catch; the animal is most abundant from 350-1000 m, less abundant from 1000-3800 m, and least abundant from 0-350 m. In addition, some specimens were taken from near the bottom using a small biological dredge at depths of about 2000 and 3800 m. No seasonal or geographical variations in abundance, or size variations with depth, etc. were indicated. An analysis of sampling gear used indicated that more shrimp were caught when a higher tow speed was employed or a larger sized mesh used: there was no correlation between the size of the animals caught and tow speed. Most of the animals captured were from 10 to 30 mm long; a study of secondary sexual characteristics indicated that few specimens were mature, and that sex determination is difficult with individuals under 40 mm, small males resembling females. Only a few females were ovigerous. A study of gut contents suggests that the species has a diverse diet, but that the most important food is copepods, with chaetognaths and radiolarians also being fairly important. Gut contents were often nearly intact in large specimens. Two larger animals had ellobiopsid parasites.