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In a study of the feeding habits of the world's largest stock of blue whales (Balaenoptera musculus), near the Channel Islands off southern California, the krill species Thysanoessa spinifera and Euphasia pacifica were found to be a major component of the diet of blue whales, with a preference shown for the larger, more coastal E. spinifera (Fiedler et al. 1998). These same two krill species were found to dominate the diets of blue whales foraging in Monterey Bay (central coast of California, USA) (Croll et al. 2005). A blue whale may consume up to two tons of krill each day (Rice 1978, cited in Fiedler et al. 1998).