31 Ball, Orville P., and Oliver B. Cope 1961 USDOI U.S. Fish and Wildlife Service 62p. 1961 American white pelican, animal studies, ecology, fish eggs, fish, fishery, mortality, population dynamics, predators, spawning, trout, Oncorhynchusnidae, westslope cutthroat trout, wildlife health, Yellowstone Lake, general wildlife health studies, Peleca In a study of the Yellowstone cutthroat trout, Salmo clarki lewisi, by the US Fish and Wildlife Service, effects of environment on mortality of eggs, immature fish, spawners, and postspawners were measured for various components of the population in Yellowstone Lake. Five methods for estimating mortality of adults on spawning runs are described, with counting and tagging as the principal procedures. The white pelican is a serious predator on cutthroat trout in Yellowstone Lake. Found at Yellowstone Research LibraryNatureBib ID: 80297