The question remains as to how sculpins could potentially
have such significant predatory and demographic effects on
sockeye salmon spawning on the island beaches when their
effects are usually not considered significant in stream habitats
(e.g., Moyle 1977). We believe the answer lies in the large
substrate on the island beaches. Leonetti (1997) reported geometric
mean particle sizes between 35 and 79 mm on Woody
Island and Fuel Dump Island spawning beaches, with particles
of