Rapid Assessment of Water Quality Using the Fingernail Clam, Musculium Transversum : Final Report

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66 growth, e.g. growth was not reduced below that of the control (Figure 34).
However, growth was not good during the experiments with a maximum growth of only 0.5 mm in 42 days. It was suspected that the slow growth was due to the small size of clams that were used at the initiation of the experi- ment (2.1-2.3 mm) and the possibility that the clams were born in the laboratory under stress conditions. Subsequent work showed that using clams that averaged 2.5 mm or greater in length resulted in
... better growth.
2.6 -I IE t£3 -D = 0.20(0.11-0.27) -• = 0.10(0.05-0.13) -A = CONTROL 0.01(0.004-0.01) -O = 0.35(0.17-0.49) — = 0.59(0.34-0.82) •- = 0.93(0.46-1.53] "» 1 — I — I 1 1 1 — I — i 1 — I 1 1 1 — I 1 — I — I 1 — r ^2 4 6 8 10 12 li| 16 18 20 22 2A 26 28 30 32 5^ 36 38 40 42 DAYS OF EXPOSURE Figure 34. Results of chronic bioassay NH 2. Un-ionized ammonia concentrations of 0.10 and 0.20 mg/1 actually stimulated the growth of fingernail clams, presumably by stimulating the growth of bacteria upon which the clams feed.


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