DESCRIPTION
The Samish Indian Nation used this funding to examine nearshore utilization by juvenile salmon in San Juan County, WA. Juvenile salmon from throughout Puget Sound and the Fraser River pass through the San Juan Islands on their outbound migrations, but relatively little is known about the how they use the mosaic of nearshore habitats offered by the islands. An effective strategy for salmon recovery must take account of how juvenile salmon make use of habitat diversity
The study sampled nine sites from northern Waldron Island, along San Juan Channel, to southern San Juan Island. The final report covers results and conclusions from two years of sampling. The focus was on coarse-sediment beaches because they are potential juvenile salmon habitat and are impacted by human development and boat landings. Nearshore habitats occupied by juvenile salmon had varying temperature and salinity characteristics during each year of this study, which indicates at least part of the range of conditions that these juveniles are adapted to. Monitoring of these nearshore physical conditions would need to occur over several years in order to capture the inter-annual variability that is indicated by these two years of data.
Findings included that juvenile salmon (chum and pink salmon) were present in the nearshore in February and that juvenile Chinook appeared in the nearshore later in the year and were a larger size than the early arrivals. Juvenile salmon appeared in the nearshore at the beginning of the sampling and were distributed at 7 of the 9 sites. Densities increased slightly in March and April and by May and June densities and distribution were at their peak. In July and August the occurrence of fish tailed off and no juvenile salmonids were caught in the nearshore sampling in September or October.