| parasitological analysis and gill histopathology of pearl dace (semotilus margarita) and brook stickleback (culaea inconstans) collected from the athabasca oil sands area (canada). | pearl dace (semotilus margarita) and brook stickleback (culaea inconstans) were collected from tributaries of the athabasca river (alberta, canada), upstream (reference site) and downstream of oil sands deposits where fish were expected to be exposed to naturally occurring oil sands constituents. the objective was to determine if fish collected from these sites exhibited differences in the prevalence or intensity of infection by parasites or in gill histology. dace did not display significant di ... | 2017 | 28378278 |