Chronic Effects of Methoxychlor on Bluegills and Aquatic Invertebrates
Chronic Effects of Methoxychlor on Bluegills and Aquatic Invertebrates

Author: Harry D. Kennedy

Publisher:

Published: 1970

Total Pages: 22

ISBN-13:

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Significantly higher numbers of aquatic insects were sampled in treated ponds than in untreated, and insect numbers at high-treatment ponds were significantly higher than at low-treatment ponds. Chironomids were dominant and significatnly increased after a certain level of treatment. Chironomids comprised 74 percent of samples from high-treatment ponds, but only 43 and 42 percent respectively fro untreated and low-treatment ponds. Methoxychlor residues were not detectable in pond-bottom mud samples.

Tissue Changes in Puffers Exposed to Methoxychlor and Methyl Parathion
Tissue Changes in Puffers Exposed to Methoxychlor and Methyl Parathion

Author: Ronald Eisler

Publisher:

Published: 1967

Total Pages: 18

ISBN-13:

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Adult northern puffers were exposed for periods up to 45 days to either 30 parts per billion (ppb) of the organochloride insecticide methoxychlor, 20, 200 ppb of the organophosphorous insecticide methyl parathion, or to a combination of 15 ppb of methoxychlor and 10, 100 ppb of methyl parathion. These concentrations will produce approximately 5 percent mortality in 96 hours under the conditions of the experiment. Profiles were constructed on the effects of each insecticide on blood and tissue components. The visual patterns provided by these profiles suggest a means of identifying unfavorable environmental conditions before the appearence of obvious morphological or physiological changes.