Chronic toxicity of waterborne thiocyanate to the fathead minnow (Pimephales promelas): A partial life-cycle study
- Univ. of Waterloo, Ontario (Canada). Dept. of Biology
Juvenile fathead minnows (Pimephales promelas) were exposed to thiocyanate (SCN[sup [minus]]) concentrations of 0, 1.1, 7.3, 16.6, or 32.6 mg/L for 124 d while monitoring growth, physiological, reproductive, and histological parameters. The NOEC for decreased egg production, increased time to first spawn, and development of overt goiter was 1.1 mg/L, whereas the LOEC for these parameters was 7.3 mg/L. Histological changes in thyroidal tissue were the most sensitive parameter observed, with an LOEC of 1.1 mg/L. Fish exposed to 16.6 or 32.6 mg SCN[sup [minus]]/L neither completed development of secondary sexual characteristics nor spawned. The LOEC for decreased growth and hematocrit was 32.6 mg/L. SCN[sup [minus]] accumulated in the plasma of fish exposed to 16.6 and 32.6 mg/L, with BCFs of 2.7 and 13.8, respectively. Development and mortality of embryos and larvae to 3 d post-hatch were also monitored in eggs spawned by adults exposed to 0 or 1.1 mg SCN[sup [minus]]/L and subsequently incubated and hatched at 0, 1.1, 7.3, 16.6, or 32.6 mg/L.Eggs spawned by adults exposed to 1.1 mg SCN[sup [minus]]/L exhibited increased percentage of eyeup and hatch, while decreasing time to hatch and mortality. There were no effects of SCN[sup [minus]] concentration during incubation on egg viability. After the 124-d exposure, adults were transferred to SCN[sup [minus]]-free water for 30 d. Insufficient numbers of adults were available from groups exposed to 32.6 mg/L to be included in the recovery study. Eggs were spawned by all groups during the recovery period, regardless of the SCN[sup [minus]] preexposure level, although time to first spawn increased with preexposure concentration.
- OSTI ID:
- 6910186
- Journal Information:
- Environmental Toxicology and Chemistry; (United States), Vol. 13:9; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
FATHEAD MINNOW
SENSITIVITY
THIOCYANATES
TOXICITY
WATER POLLUTION
ANIMALS
ANTITHYROID DRUGS
AQUATIC ORGANISMS
CARBONIC ACID DERIVATIVES
DRUGS
FISHES
HORMONE ANTAGONISTS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLLUTION
VERTEBRATES
560300* - Chemicals Metabolism & Toxicology
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)