Microcomputer models for salmonid hatcheries

Three microcomputer models are presented for salmonid fish culture use. They are based on current information compiled from recent literature and unpublished data. They deal with (1) the effect of temperature on egg and larval development rates and oxygen requirements of five species of Pacific salmon (chinook Oncorhynchus tshawytscha , chum O. keta , coho O. kisutch , pink O. gorbuscha , sockeye O. nerka ) and steelhead O. mykiss ; (2) the influence of temperature, fish size, and ration level on oxygen consumption rate and hence on the rearing capacity of a water supply; and (3) gas supersaturation and its effect on juvenile salmonid survival. The biological responses for each program are presented, the data sources are cited, and the mathematical relations are described. This is followed by a description of program inputs and outputs. Finally, illustrative examples are generated for each of the three microcomputer programs, based on commercial spreadsheet software.