Skate egg cases (family Rajidae) on the Scotian Shelf : spatial distributions and an identification guide to the common species / by Daphne E. Themelis and James E. Simon. : Fs97-6/3413E-PDF

"Population declines have been observed for several skate species inhabiting the Scotian Shelf in the Northwest Atlantic, causing conservation concerns and considerations for listing under the federal Species at Risk Act. Skate reproductive strategies involve low fecundity and high parental investment, therefore the relative mortality of early life stages is important for population health. Information on the length of gestation and spatial distribution of egg cases, and overlap with commercial fisheries or other marine industries is needed to identify potential threats during embryo development. Egg case and juvenile skate distributions on the Scotian Shelf and Georges Bank were mapped using data collected by Fisheries and Oceans Canada (DFO) science programs. Winter Skate eggs held in aquaria hatched after 22 months. Identification of important areas for early life stages of skates was hampered by the sparsity of appropriate data. A picture guide is included for identifying egg cases of common skate species"--Abstract, page iv.

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publications.gc.ca/pub?id=9.894135&sl=1

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