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An Assessment of Sampling Mortality of Larval Fishes
Author(s) -
Cada Glenn F.,
Hergenrader Gary L.
Publication year - 1978
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(1978)107<269:aaosmo>2.0.co;2
Subject(s) - entrainment (biomusicology) , ichthyoplankton , sampling (signal processing) , mortality rate , environmental science , larva , biology , hydrology (agriculture) , ecology , fishery , demography , geology , medicine , sociology , rhythm , geotechnical engineering , filter (signal processing) , computer science , computer vision
Abstract A study was initiated to assess the mortality of larval fishes that were entrained in the condenser cooling systems of two nuclear power plants on the Missouri River in Nebraska. High mortalities were observed not only in the discharge collections but also in control samples taken upriver from the plants where no entrainment effects were possible. As a result, entrainment mortality generally could not be demonstrated. A technique was developed which indicated that (1) a significant portion of the observed mortality above the power plants was the result of net‐induced sampling mortality, and (2) a direct relationship existed between observed mortality and water velocity in the nets when sampling at the control sites, which was described by linear regression equations. When these equations were subsequently used to remove the effects of wide differences in sampling velocities between control and discharge collections, significant entrainment mortality was noted in all cases. The equations were also used to derive estimates of the natural mortality of ichthyoplankton in this portion of the Missouri River.