Methoxychlor and estradiol-17β affect alevin rainbow trout (Oncorhynchus mykiss) mortality, growth, and pigmentation

• Published in: Bulletin of environmental contamination and toxicology Vol. 61; no. 4; pp. 519 - 526
• Main Authors: KRISFALUSI, M, EROSCHENKO, V. P, CLOUD, J. G
• Format: Journal Article
• Language: English
• Published: New York, NY Springer-Verlag 01.10.1998
• Subjects: 17 beta -Estradiol; Agnatha. Pisces; Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Catostomus commersoni; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on vertebrates; estradiol-17b; Fundamental and applied biological sciences. Psychology; Jordanella floridae; methoxychlor; Oncorhynchus mykiss; Steroid; Insecticide; Poison interaction; Toxicity; Pesticides; 17β-Estradiol; Fry; Methoxychlor; Oncorhynchus mykiss; Toxic association; Vertebrata; Organochlorine compounds; Pisces
• ISSN: 0007-4861; 1432-0800
• DOI: 10.1007/s001289900793

Alevin rainbow trout, Oncorhynchus mykiss, were exposed to varying concentrations of methoxychlor and estradiol-17 beta , and effects on mortality, growth, and pigmentation were determined. The embryos were exposed to the chemicals for 2-h periods every third day for a total of ten treatments. Results showed that exposure to methoxychlor increased trout mortality in a dose-dependent manner, but trout exposed to estradiol-17 beta exhibited significantly higher mortality. At 24 d post-hatch, the groups treated with either compound weighed less than controls, but in the methoxychlor-treated fish, this correlation was negative, while in the estradiol-17 beta -treated fish it was not. By day 6 post-hatch, the skin of the methoxychlor-treated fish was lighter in color than controls, whereas that of the estradiol-17 beta -treated fish was darker than controls. This alteration in pigmentation was only temporary, however.