Rainbow smelt, which colonized numerous waters in the upper Rainy Lakewatershed after being introduced by humans, first appeared in the waters of Voyageurs National Park in 199 . Based on studies conducted elsewhere, the smelt could have significant negative effects on the parks aquatic ecosystem, and in particular its cool- and cold-water fish species. This is particularly true for cisco, (Coregonus artedii) and lake whitefish (Coregonus clupeaformis), the two native coregonines in the park.
On the basis of morphological measurements, previous investigators concluded that three cyprinid species, fathead minnow (Pimephales promelas), blacknose shiner (Notropis heterolepis), and pearl dace (Margariscus margarita), from Harvey Lake in Isle Royale National Park were unique enough to warrant subspecific status. Other investigators, however, have questioned these designations and concluded the Harvey Lake fish do not merit such designation.
The introduction, both incidental and intentional, of non-native fishspecies into national parks, including Voyageurs National Park, is a significant issue both from the biological and political perspective. Although these introductions often have strong public support, in many instances they have the potential to negatively impact the parks aquatic ecosystem, including the native fish stocks. Six of Voyageurs National Parks small lakes have established populations of non-native largemouth bass as a result of plantings made before establishing the park.
The National Contaminant Biomonitoring Program(NCBP)was established todocument trends in the occurrence of persistent toxic chemicals that may threaten fish and wildlife resources.Begun in the early 196 s as part of the National Pesticide Monitoring Program,the NCBP has expanded its initial focus on persistent organochlorine insecti- cides to include industrial chemicals,herbicides,and potentially Toxic elemental contaminants.The program also provides necessary feedback to the process by documenting the success(or failure)of regulatory actions related to environmental contami
The objectives of this study are to: (1) determine the number of daily foraging trips and distance that cormorants travel from their breeding colony to forage on western Lake Erie; and (2) determine the distribution of fish based on foraging behavior of DCCOs in western Lake Erie. Keywords:Assessment, Diet, Double-crested, Fish-eating birds, Fishes Movement
A revised and expanded contaminant monitoring program is necessary toassess existing, and anticipate future, contaminant-related impacts to fish and wildlife and their habitats. To achieve these objectives, the revised program, to be named Biomonitoring of Environmental Status and Trends (BEST), will use a biologically integrated approach to monitor. Keyword: Analytical chemistry, Aquatic, Biological, Contaminant, Development, Fisheries Mgmt., Indicator, Invertebrate, Lead, Methods
The most sensitive portion of a fishs life to the toxic effects of chemicalcontaminants is from embryonic development through the fry stages. This has been demonstrated to be true for numerous classes of chemicals. However, there are two shortcomings of the standard protocols for testing the toxicity of chemicals to early life stages of fish. First, the current tests to determine the toxicity of chemicals to early life stages of fishes rely upon waterborne exposure.
These studies will evaluate commercial immunoassay kits, improve our understanding of the capabilities and limitations of this new methodology for contaminant analysis, and develop immunochemical assays for new chemicals. We are investigating the extent to which thiaminase activity in forage fish and the food chain of Great Lakes salmonids may be causing a depletion of thiamine in the eggs of these fish and resulting in an early mortality syndrome. Keyword: Biochemical, Contaminant, Enzyme, Fish
Determining the significance of contaminants in sediments to aquaticorganisms is a challenging new topic in environmental toxicology. Mounting evidence exists of environmental degradation in areas where water quality criteria are not exceeded, yet organisms are adversely affected. Historically, emphasis has been placed on evaluating contaminant effects in surface waters, not sediment. Most assessments of water quality focus on water-soluble compounds, and sediment is considered a safe repository of sorbed contaminants.