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USGS · 1014353

Short term alleviation of ammonia toxicity by environmental sodium chloride in channel catfish (Ictalurus punctatus)

B.D. Redner·Simco Tomasso
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Journal of the Tennessee Academy of ScienceArticle

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B.D. Redner, Simco Tomasso. 1980. Short term alleviation of ammonia toxicity by environmental sodium chloride in channel catfish (Ictalurus punctatus). https://pubs.usgs.gov/publication/1014353

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We used basking traps and hoop nets to sample turtles in Standing Stone Lake at 2-week intervals from May to November 2006. In alternate weeks, we conducted visual basking surveys. We collected and observed four species of turtles: spiny softshell (Apalone spinifera), northern map turtle (Graptemys geographica), pond slider (Trachernys scripta), and snapping turtle (Chelydra serpentina). Relative abundances varied greatly among sampling methods. To varying degrees, all methods were species selective. Population estimates from mark and recaptures of three species, basking counts, and hoop net catches indicated that pond sliders were the most abundant species, but northern map turtles were 8× more abundant than pond sliders in basking trap catches. We saw relatively few snapping turtles basking even though population estimates indicated they were the second most abundant species. Populations of all species were dominated by adult individuals. Sex ratios of three species differed significantly from 1:1. Visual surveys were the most efficient method for determining the presence of species, but capture methods were necessary to obtain size and sex data.

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