Tests of rhodamine WT dye for toxicity to oysters and fish
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Abstract
Because of the toxicity to oyster larvae and eggs of rhodamine B dye in concentrations greater than 1 mg/l in earlier tests, there was a concern that rhodamine WT, a similar tracer dye, would have a detrimental effect on marine life being developed under the aquaculture program of the Lummi Indian Tribe near Bellingham, Wash. Tests showed that 48-hour exposures at 24° C of 11,000 oyster eggs per liter and 6,000 12-day-old larvae per liter, in sea water with concentrations of rhodamine WT ranging from 1 μg/l to 10 mg/l, resulted in development of the eggs to normal straight-hinge larvae and no abnormalities in the larvae development. Tests made on the smolt of both silver salmon and Donaldson trout, with the fish held for 17.5 hours in a tankfull of sea water with a dye concentration of 10 mg/l at 22°C showed no mortalities or respiratory problems. With the concentration increased to 375 mg/l, and the time extended an additional 3.2 hours, still no mortalities or abnormalities were noted. The fish remained healthy in dye-free water when last checked a month after the test.
Suggested Citation
Parker, G.G., 1973, Tests of rhodamine WT dye for toxicity to oysters and fish: Journal of Research of the U.S. Geological Survey, v. 1, no. 4, p. 499-499.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Tests of rhodamine WT dye for toxicity to oysters and fish |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 1 |
| Issue | 4 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 1 p. |
| First page | 499 |
| Last page | 499 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |