Abstract
Abstract Fish sampling with detonating cord (Primacord) in blocked areas of warmwater impoundments or drainable ponds was inferior to sampling with rotenone (followed by detoxification) in terms of efficiency of fish retrieval, cost, personnel, and convenience. Twenty-one enclosures, including 13 blocked areas in impoundments and 8 experimental ponds, were treated with either rotenone at 3 mg/L (active ingredient) or with Primacord laid in parallel with spacing of 4 m between lines. Marked fish were added to blocked areas and experimental ponds were stocked with known populations prior to detonation or rotenone treatment. Retrieval efficiency with either method depended on fish length but not on species. When similar enclosures were compared, fish retrieval efficiency was always greater for rotenone samples than for Primacord samples. Draining of the experimental ponds indicated that the difference in efficiency could be accounted for by the quantity of fish surviving the Primacord detonation. Primacord i...
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