Of the fin whale stomachs sampled off British Columbia between 1963 and 1967, euphausiids dominated the diet for four of the five years (82.3 to 100% of the diet), while copepods only formed a major portion of the diet in 1965 (35.7%). Miscellaneous fish, squid, and octopus played only a very minor part of the diet in two of the five years (3.6 to 4.8%). Fin whales caught off California between 1959 and 1970 fed on the pelagic euphausiid "Euphausia pacifica" (86% of sampled individuals), the more neritic euphausiid "Thysanoessa spinifera" (9%), and the northern anchovy ("Engraulis mordax") (7%); only trace amounts (<0.5% each) were found of Pacific saury ("C. saira") and juvenile rockfish ("Sebastes jordani"). In the Gulf of California, they have been observed feeding on swarms of the euphausiid "Nyctiphanes simplex".