This excel workbook contains data from a study of trophic transfer of radiolabeled (C-14) chlorpyrifos from organophosphate-resistant Hyalella azteca to a known predator, the Inland silverside Menidia beryllina. Fish were fed 15 dosed (~ 1 ng/animal) or control H. azteca for 7 days at two temperatures, 18 and 23°C, to simulate changes anticipated under global climate change (GCC). Following feeding, fish were analyzed for critical swimming speed (Ucrit) and brain acetylcholinesterase (AChE) activity. Total chlorpyrifos concentrations, as well as percent parent compound as a a measure of biotransformation, were measured in both H. azteca and M. beryllina.

Date created


File format

Excel (xlsx)

File size

754 kB

Geographic coverage

not applicable (lab study)

Scientific names

Hyalella azteca, Menidia beryllina


Chlorpyrifos; Bioaccumulation; Menidia beryllina; Swimming Performance