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Seasonal Changes in Growth, Mortality, and Condition of Rainbow Trout following Planting
Author(s) -
Needham P. R.,
Slater Daniel W.
Publication year - 1945
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1943)73[117:scigma]2.0.co;2
Subject(s) - rainbow trout , hatchery , sowing , trout , zoology , biology , fishery , fish <actinopterygii> , agronomy
The results of experimental plantings of rainbow trout in Convict Creek (California) are presented as related principally to changes in growth, mortality, and condition from month to mouth over two summer seasons. Survivals are discussed in relation to a food‐requirement ratio that has been shown to correlate positively with survival rates obtained. Survivals of 33 per cent and 56 per cent were obtained over periods of 151 days and 179 days, respectively. Wild fish grew approximately twice as fast as planted fish each season. The coefficient of condition of the planted rainbow trout fell consistently for the first few months following planting. A parallel loss in condition of wild trout occurred but was less marked. “Conditioning” of hatchery trout for from 1 to 3 weeks prior to planting had no appreciable effect on survival rates.