Effects of tidal currents on Pacific salmon migration: results from a fine-resolution coastal model

Authored by PH Leblond, MC Bourque, PF Cummins

Date Published: 1999

DOI: 10.1139/cjfas-56-5-839

Sponsors: National Science and Engineering Research Council of Canada (NSERC)

Platforms: No platforms listed

Model Documentation: Other Narrative

Model Code URLs: Model code not found

Abstract

Experiments with a numerical model of salmon homing migration show that tidal currents can significantly affect return timing of sockeye salmon (Oncorhynchus nerka) off the northern coast of British Columbia. The numerical model combines results from a fine-resolution hydrodynamic model of the waters off northern British Columbia with an individual-based model of salmon migration. Results suggest that coastal tidal currents affect the return timing by causing the number of returning salmon to vary at a cycle corresponding to the dominant tidal period of 12.4 h. Such variations are associated with a patchiness that develops in the spatial distribution of simulated salmon. These features occur as the salmon swim through an oscillating tidal current that exhibits relatively sharp gradients in amplitude. The results may be of use to the design of sampling strategies where aliasing problems may occur.

Tags

Spatially explicit Computer-simulations Ocean River sockeye-salmon Larvae Sea Advection