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Survival and Growth of Fingerling Brown Trout (Salmo Fario) Reared under Different Hatchery Conditions and Planted in Fast and Slow Water
Author(s) -
Schuck Howard A.,
Kingsbury Oliver R.
Publication year - 1948
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(1945)75[147:sagofb]2.0.co;2
Subject(s) - salmo , trout , hatchery , sowing , brown trout , fishery , zoology , biology , environmental science , fish <actinopterygii> , agronomy
Data obtained on Crystal Creek, New York, relative to the effectiveness of planting brown trout in slow and in fast water are presented. Of three plantings of fingerlings made throughout the length of tile stream, annual electrical inventories showed a significantly greater number of fish present in fast‐water sections than in slow‐water sections. Of the June 1940 planting, 20.2 trout per fast‐water section and 10.1 per slow‐water section were found after 3 months; of the September 1941 planting, 6.8 per fast‐water section and 2.6 per slow‐water section were recovered after one year; of the October 1940 planting, 1.00 per fast‐water section and 0.62 per slow‐water section were taken after one year. In other experiments over a summer period only, where fish were planted in screened‐off areas of fast or slow water, inventories after short periods of time also showed the survival to be greater in fast water. Of two plantings in each water type, after 4 weeks there were 2.2 times as many fish surviving in the fast water as in the slow water. Growth rates of planted brown trout in both series of experiments were also greater in fast water. One experiment was designed to measure the effect of rearing trout in the hatcheries on a diet composed of meat and dry foods as contrasted to a diet of straight meat. The criteria employed were relative survival and growth rates after planting of trout reared under these conditions. No differences in the survival or growth associated with hatchery diets could be found. The amount of data available for this test was limited, however. Differences in survival and growth of successive plantings made in the same sections of stream indicate the variability of stocking results and suggest the necessity of valuating further the effects of various hatchery procedures and stocking methods upon the success of plantings.