Orientation des déplacements de crabes des neiges mâles ( Chionoecetes opilio ) marqués dans le sud-ouest du golfe du Saint-Laurent
A total of 7760 Chionoecetes opilio males were marked and released on the bottom at the entrance to Chaleur Bay and near the Îles-de-la-Madeleine in the southwestern Gulf of St. Lawrence in 1986 and 1987. Of this number, 976 individuals, all morphometrically mature, were recovered between 1987 and 1...
| Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Canadian Science Publishing
1991
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/f91-140 http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-140 |
| Summary: | A total of 7760 Chionoecetes opilio males were marked and released on the bottom at the entrance to Chaleur Bay and near the Îles-de-la-Madeleine in the southwestern Gulf of St. Lawrence in 1986 and 1987. Of this number, 976 individuals, all morphometrically mature, were recovered between 1987 and 1989. The average distance covered was 9.6 km for Chaleur Bay (maximum 47.0 km) and 13.7 km for the Îles-de-la-Madeleine (maximum 89.5 km). Size had no significant effect on distance covered or direction of movement. Individuals released at higher or intermediate bottom depths followed the slope downward. In the Chaleur Bay sector, the crabs at greater depth showed a tendency to move up the slope. Near the Îles-de-la-Madeleine, most of the individuals released at greater depth stayed on the valley floor, but there was also a tendency to move upward. It appears that there are two types of travel, a general downward movement, disturbed by seasonal shifts which are undoubtedly related to reproduction. Large movements suggest the possible existence of contacts between local substocks. |
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