Abstract
Rainbow trout distribution and abundance in lakes and reservoirs has been correlated with a wide range of physical, chemical and biological factors. In North American lakes and reservoirs, distribution and abundance are affected by variables such as lake elevation, water chemistry, and lake morphology, as well as biological factors such as food availability and competition with other fish species. Chemical and physical features that serve as indices of biological productivity, including pH, alkalinity, total dissolved solids and morpho-edaphic index, have been related positively to trout abundance. Rainbow trout occurrence and distribution in lakes and reservoirs is determined mostly by a combination of factors, notably the concentration of dissolved oxygen, water temperature and food. The upper water temperature threshold for rainbow trout habitat in lakes is generally around 21°C, while a dissolved oxygen concentration of 2.5 mg L−1 is generally taken as the lower limit for distribution.
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