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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Water quality modulation of aluminum toxicity to rainbow trout (Oncorhynchus mykiss) : biological and physiological approaches

Gundersen, Deke T. 13 December 1994 (has links)
Graduation date: 1995
2

DEVELOPMENT OF HIGH PH IN MOUNTAIN LAKES OF ARIZONA.

Jones, David Earl, 1950- January 1982 (has links)
No description available.
3

Influence of water hardness on gill accumulation and acute toxicity of aluminum in rainbow trout

Bustaman, Sjahrul 14 January 1992 (has links)
Rainbow trout were exposed to aluminum at pH 7.25 and 8.25 and four hardnesses (10, 30, 80, and 120 ppm CaCO₃) for 96 hours in a continuous-flow system and mortality and aluminum accumulation in the gills were determined. Temperature, pH, and dissolved oxygen were measured daily for each treatment. Dissolved and total aluminum concentrations and hardness were determined following exposure periods of 48 and 96 hours. Aluminum was most toxic at pH 8.25, and was more toxic at lower than at higher hardnesses. Water hardness provided a significant protective effect against aluminum-induced mortality (p < 0.05), and there were no significant effects for water hardness on gill accumulation at either of pH. At pH 7.25 no mortalities occurred under any conditions. At pH 8.25, the accumulation of aluminum in gill tissues was higher than for pH 7.25 following exposure for 96 hours. In addition, aluminum concentration and exposure time had a significantly cumulative effect on fish mortality (p < 0.05). Possible mechanisms for aluminum toxicity and the accumulation of aluminum in the gills of rainbow trout were attributed to the forms and solubilities of aluminum species at different pH values. Competition between Ca²⁺ and aluminum for binding sites on the gills likely influenced aluminum toxic action. / Graduation date: 1992

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