From an evolutionary perspective, migration is favored when the benefits of moving to a different habitat outweigh the costs of this behavior and therefore positively impact fitness ( Gross 1987 Hendry et al.
Migrations occur at various spatial and temporal scales and are related to activities such as feeding, seeking environmental refugia or shelter, and reproduction ( Wootton 1998). Migration has been defined as “those movements, often nonrandom or directed, that result in an alternation between two or more separate habitats, occur with a regular periodicity and involve a large fraction of the population” ( Northcote 1978, 1984). Many fish undertake migrations during some stage of their life. Our study provides novel information that aids the management of Striped Bass at both small (e.g., setting of fishing seasons in the Roanoke River) and large spatial scales (e.g., stock identification of Roanoke River fish in the mixed-stock ocean fishery) and more broadly highlights the utility of large-scale cooperative telemetry arrays in studying fish migration. Cooler ocean water temperatures in 2013 delayed the spring spawning run by nearly 3 weeks relative to a year of average spring temperatures (2012). Our results showed no evidence of straying or skipped spawning, as all migrants successfully returned (homed) to the Roanoke River the next spring to spawn. They then migrated southward in the fall to overwintering habitats off Virginia and North Carolina and completed their migration circuit the following spring by returning to the Roanoke River to spawn. We found that large Roanoke River Striped Bass (>900 mm TL) rapidly emigrated (∼59 km/d) after spawning to distant (>1,000 km) northern ocean waters (New Jersey to Massachusetts), where they spent their summers.
American harvest stockmaster drivers#
Atlantic coast (480 total receivers, including the Roanoke River) were used to evaluate the seasonal migration and distribution of telemetered fish, their degree of homing and skipped spawning, their migration speeds, and the environmental drivers of migration timing. Data from a large-scale acoustic telemetry array along the U.S. To this end, we telemetered and released 19 large Roanoke River Striped Bass (750–1,146 mm TL) on their spawning grounds during the springs of 20. Anadromy in Roanoke River Striped Bass Morone saxatilis has been documented however, the specifics of the ocean migration and the degree of homing in this population remain unstudied and would greatly benefit the management of this economically important species.
0 kommentar(er)
