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Description: |
7 pages : tables ; 26 cm. |
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With Note: |
With: Accumulation and loss of 2,́ 5-dichloro-4-́nitrosalicylanilide (Bayer 73) by fish : laboratory studies. by Verdel K. Dawson, Joe B. Sills, and Charles W. Luhning. (No. 90). |
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Bibliography Note: |
Includes bibliographical references (page 7). |
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Summary, Etc. Note: |
Abstract: Applications of 2- or 5 microliter/liter concentrations of synergized rotenone (2.5%) in the Pro-Noxfish formulation to two shallow 0.05-ha ponds caused a temporary reduction in both total numbers and diversity of benthic invertebrates and a total mortality of cagesd Asiatic clams in both ponds, and a partial mortality of a resident population of larval leopard frogs in the 5 microliter/liter treatment. At day 7 after treatment, benthic organisms(no./meter squared) were reduced 67% by the 2-microliter/ liter concentation and 96% by the 5 microliter/liter application. The diversity index declined sharply in both days between days 3 and 7 after treatment, the lowest values being recorded on day 7 and day 37 in the 2- or 5 microliter/liter treatments respectively. The equitability index declined from day 3 to day 37 in both ponds. By day 69, however, total numbers of benthic organisms had more than doubled over those originally present in the 2 microliter/liter treatment (121% increase), had more than tripled in the 5 microliter/liter treatment (223% incres), and were virtually unchanged in the control pond (2% increase). Pretreatment zooplankton populations were low; no significant deleterious effects from the treatments were observed. |