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Lake Francis Case, a Missouri River Reservoir

其他書名	Changes in the Fish Population in 1954-75, and Suggestions for Management
出版	U.S. Department of the Interior, Fish and Wildlife Service, 1977
URL	http://books.google.com.hk/books?id=8U9pirN2tiwC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋Changes in fish abundance and species composition were mainly a result of poor reproductive success caused by water-level fluctuations during the spring and early summer, and physical changes in the shoreline environment. Fish reproduction was most successful in years when the reservoir was filled in the spring and a nearly constant level was maintained through July. Survival and growth would probably improve if the pool drawdown in the fall were reduced. Fish abundance could be increased if water-level management conformed more closely to requirements for fish reproduction. However this is only possible in some years because of the multipurpose function of the reservoir. In consideration with this restraint, a 3-year cycle in pool level management was recommended with a relatively low level maintained for two years to encourage growth of shoreline vegetation followed by a high level during the 3rd year, through July, to encourage successful spawing and survival of young of a number of important game species, as well as increase the abundance of forage fishes and invertebrates.