Item Details

Print View

Aspects of Growth, Reproduction, Distribution and Abundance of the Jonah Crab, (Cancer Borealis) Stimpson, in Norfolk Canyon and the Adjacent Slope

Carpenter, Richard Kemper
Format
Thesis/Dissertation; Online
Author
Carpenter, Richard Kemper
Advisor
Musick, John A
Haefner, Jr., Paul
Grant, George C
Abstract
Cancer borealis was found to be contagiously distributed on the continental shelf and upper slope in Norfolk Canyon and the adjacent slope in depths of 47-500 m and temperatures of 5.0-15.4°C. Maximum abundance was observed betweenl50° and 350 meters and 6.0-ll.9°C, Female crabs were more abundant than males at depths less than 150 m and males more abundant in deeper water. Male C. borealis attain a larger size than do females. Molting takes place throughout the year for small crabs but larger crabs molt less frequently in winter than during the remainder of the year, Male crabs appear to become sexually mature at a long carapace width of 90-100 mm as do females although maturity may be reached at a smaller size for females. C. borealis mates throughout the summer and fall with a peak in late summer, Spawning appears to take place in late winter and early spring. Morphometric analysis revealed changes in the growth rate of abdomen and carapace of female C. borealis at 80-90 mm long carapace width. No such changes were observed in the males. 
Language
English
Published
University of Virginia, Department of Marine Science, MA (Master of Arts), 1978
Published Date
1978
Degree
MA (Master of Arts)
Collection
Libra ETD Repository
In CopyrightIn Copyright
▾See more
▴See less

Availability

Read Online