The majority of the studies attempting to explain fluctuations of mercury (Hg) concentrations in fish from diverse aquatic ecosystems have invoked the influence of physico-chemical or environmental factors but has eluded that of strictly biological factors. In this study, we examine the relationship between Hg concentrations in walleye (Sander vitreus) muscles and their growth rates in 12 natur...

Ojibwe Tribes' approach to the natural world is guided by original treaties between beings (species and spirits) people who reside in lands now known as United States Canada. Relationships with these beings, such ogaa (walleye Stizostedion vitreus), are best characterised taking care of a relative/gift for next seven generations Ojibwe. Initial denial treaty rights state government has strongly...

Invasive species are a major threat to ecosystem structure and function. For example, Bythotrephes cederströmii (Bythotrephes hereafter) invasions have significantly reduced native zooplankton density biomass, resulting in competitive interactions with zooplanktivorous fishes. Young of year (YOY) walleye (Sander vitreus) initially recently been shown display growth Bythotrephes-invaded lakes. H...

BACKGROUND The North American Great Lakes are home to > 140 types of fish and are famous for recreational and commercial fishing. However, the presence of toxic substances has resulted in the issuance of fish consumption advisories that are typically based on the most restrictive contaminant. OBJECTIVES We investigated whether these advisories, which typically neglect the existence of a mixtu...

The extent of bioaccumulation of the syn- and anti-isomers of Dechlorane Plus (DP) is assessed in archived food web samples from Lake Winnipeg and Lake Ontario. Concentrations of the isomers were determined using purified analytical solutions of individual isomers as opposed to the technical mixture. The syn-isomer was consistently detected in all samples from both lakes; the anti-isomer was de...

In the flesh (skinless fillet) of chinook, chum, coho, pink, and sockeye salmon (Oncorhynchus tshawytscha, O. keta, O. kisutch, O. gorbuscha, and O. nerka, respectively), sablefish (Anoplopoma fimbria) and walleye pollock (Theragra chalcogramma) from several sites in the northeast Pacific sampled between 2002 and 2008, tetra- and pentabrominated diphenyl ethers (BDEs) (BDE 47, 49, 99, and 100) ...