摘要:

The effects of sublethal concentrations of copper on the structure and activity of schools of the Atlantic silverside Menidia menidia were studied. A computerized video technique was employed to provide three-dimensional analysis. Ten experiments were conducted in which the behavior of a school exposed to from 0 to approximately 100 μg/L of copper was compared to the behavior of the same school on the previous day (control). Fish schools exposed to copper differed significantly (P < 0.05) from control schools in distance to nearest neighbor, swimming speed, mean direction of travel, rate of change of direction, and depth of the school in the tank. At low concentrations of copper, schools increased their swimming speed, decreased their rate of change of direction and their nearest-neighbor distances, and swam more in parallel orientation than schools under control conditions.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1985)114<413:EOSCCO>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Five acidic clear (pH 3.7–4.9), three acidic colored (pH 4.1–4.6), and three neutral (pH 6.9–7.3) north-central Florida lakes were surveyed in 1983 to determine plasma osmotic and electrolyte concentrations, growth, and coefficients of condition for largemouth bass Micropterus salmoides floridanus. Plasma osmotic concentrations averaged greater than 273 milliosmoles/kg in fish from acidic colored and circumneutral lakes, but averaged less than 269 milliosmoles/kg in four of the acidic clear lakes. Growth and coefficients of condition of largemouth bass > 305 mm total length in the acidic lakes were significantly lower than in the neutral lakes. Reductions in fish growth and condition, however, could be related to either acidic conditions or lake trophic status.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1985)114<423:POAECO>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Immediate mortality of juvenile alosids, American shad Alosa sapidissima and blueback herring A. aestivalis, passed through the 17-MW Kaplan turbine at Holyoke Dam on the Connecticut River was estimated with mark-capture methods. Turbine-induced mortality was 62% at 16.5-MW generation, 82% at 12 MW, and 82% at 5.5 MW. The significantly lower mortality of fish at full power output is thought to be related to greater turbine efficiency.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1985)114<430:MOJASA>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/1548-8659(1985)114<436:DCC>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1984.10492797

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor