Differences in Sexual Maturity and Related Characteristics Between Populations of Thorny Skate (Raja radiata) in the Northwest Atlantic

Source - Journal of Northwest Atlantic Fishery Science, Volume 7(2): 155-167
ISSN-0250-6408

Templeman, W. 1987. Differences in Sexual Maturity and Related Characteristics Between Populations of Thorny Skate (Raja radiata) in the Northwest Atlantic. J. Northw. Atl. Fish. Sci. 7(2): 155-167. https://doi.org/10.2960/J.v7.a1

Abstract

Sexual maturity of the thorny Skate (Raja radiata) occurs at relatively small sizes off northern Iceland and West Greenland, off Baffin Island and Labrador, on the Northeast Newfoundland Shelf and in the Gulf of St. Lawrence, and at considerably larger sizes on the Grand Bank and St. Pierre Bank. In areas with sexual maturity at a small length, the maximum fish lengths were typically small, and in areas with sexual maturity only at much greater lengths, the maximum lengths were considerably larger. The largest thorny skate was a 104-cm male from the Southern Grand Bank. The lengthsats maturity and themaximum lengths for males were greater than those for females. One hermaphrodite was noted. There was a higher maximal number of rows of alar spines in areas with sexual maturity at a larger size. From the great differences between areas in length at sexual maturity, it is concluded that no large-scale migrations of thorny skate occurred between these areas.

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Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - December 1987
Publication Type - Journal Article

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