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The greenback cutthroat trout (Oncorhynchus clarki stomias) is native to the mountain and foothill waters of the South Platte and Arkansas river basins in Colorado. This taxon declined rapidly beginning near the turn of the century and was listed under the Endangered Species Act in 1973. We assembled all available information from a variety of sources to document recovery efforts from 1957 to 1999. For each greenback cutthroat trout population, we noted (1) the characteristics of recovery waters and dates of population discovery or introduction; (2) fish abundance estimates; (3) analyses of genetic purity; (4) salmonid fauna, removal efforts, and reinvasions; and (5) dates, sources, and numbers of fish used to establish populations. For each hatchery used to assist recovery, we noted (1) sources and numbers of fish delivered to them; (2) sources, sex ratios, and production of fish used to create particular year classes; and (3) dates, numbers, and sizes of hatchery fish shipped to establish wild populations or supplement other hatchery stocks.
Greenback cutthroat trout --- Greenback cutthroat trout --- Wildlife recovery --- Wildlife recovery
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Salmon stock management --- Fish habitat improvement --- Wildlife recovery
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Pacific salmon fisheries --- Steelhead fisheries --- Fishery management --- Wildlife recovery --- Costs.
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Endangered species --- Wildlife recovery --- United States. --- Endangered Species Act of 1973 (United States)
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Greenhouses --- Greenhouses --- Construction materials --- Construction materials --- glass --- glass --- Plastic film --- Plastic film --- Heat --- Heat --- Heat recovery --- Heat recovery --- humidity --- humidity --- Measurement --- Measurement --- Radiation --- Radiation --- Solar energy --- Solar energy --- Europe --- Europe
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Protection of our environment is now a global priority and legislation is being introduced in regions such as the European Union to ensure that material usage is maximised. Much of the development work has been pioneered in Germany which introduced very strict recycling laws. This report examines the issue of converting plastics waste into energy and/or useful chemicals. Polymers are generally derived from fossil fuels which are being gradually depleted. Much plastic material is discarded as waste, such as packaging and end-of-life vehicle components. It is essential that we find means to pres
Plastics --- Recycling (Waste, etc.) --- Conversion of waste products --- Recovery of natural resources --- Recovery of waste materials --- Resource recovery --- Waste recycling --- Waste reuse --- Conservation of natural resources --- Refuse and refuse disposal --- Energy conservation --- Salvage (Waste, etc.) --- Waste products --- Plastic materials --- Plastic products --- Polymers --- Synthetic products --- Condensation products (Chemistry) --- Elastomers --- Plasticity --- Recycling. --- Waste disposal.
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