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The Effect of Natural and Artificial Propagation in Maintaining a Run of Atlantic Salmon in the Penobscot River
Author(s) -
Roundsefell George A.
Publication year - 1947
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(1944)74[188:teonaa]2.0.co;2
Subject(s) - hatchery , stocking , fishery , fish <actinopterygii> , fish hatchery , period (music) , environmental science , biology , fish farming , aquaculture , acoustics , physics
Analysis of the effect of hatchery plants of Atlantic salmon over a 70‐year period on the maintenance of the Penobscot River salmon run shows that artificial propagation was not significantly more effective than natural propagation, but was more effective in later than in earlier years. The numbers that can be raised to a sufficiently large size before stocking to gain a material advantage over natural propagation are too limited to employ hatcheries for the maintenance of large runs. The chief role of the hatchery is to provide young fish for reestablishing former runs, and to increase the survival of young during the early period of restoration when the hatcheries can handle a significant proportion of the total eggs in the spawning run.