Early life-stage toxicity test methods for gulf toadfish (Opsanus beta) and results using chlorpyrifos
Gulf toadfish (Opsanus beta) were continuously exposed as embryos, sac fry, and juveniles to technical chlorpyrifos in two 49-day early life-stage toxicity tests. Survival was significantly (alpha = 0.05) reduced only in 150 micrograms/liter. However, toadfish exposed to chlorpyrifos concentrations from 3.7 to 150 micrograms/liter weighted significantly less than control fish: 9% lower in 3.7 micrograms/liter to 62% lower in 150 micrograms/liter. The 96-hr LC50 for juvenile fish was 520 micrograms/liter. Concentrations of chlorpyrifos in toadfish and bioconcentration factors increased with increasing exposure concentration, a condition not generally observed with other marine fishes and other test chemicals. These results demonstrated the procedures for, and the practicality of, early life-stage tests with this marine species. We recommend the use of the gulf toadfish for comparative toxicity testing and for evaluating the toxicity of substances in conjunction with ontogenetical, physiological, and histological investigations of this considerably studied genus. We do not recommend it for routine effects testing.
- Research Organization:
- Environmental Protection Agency, Gulf Breeze, FL
- OSTI ID:
- 5527099
- Journal Information:
- Ecotoxicol. Environ. Saf.; (United States), Vol. 1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC CHLORINE COMPOUNDS
TOXICITY
DOSE-RESPONSE RELATIONSHIPS
FISHES
LIFE CYCLE
SEAWATER
SURVIVAL TIME
ANIMALS
AQUATIC ORGANISMS
HYDROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
VERTEBRATES
WATER
560305* - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)