Introduction:

            Construction and operation of the outlet from Devils Lake connects a closed basin in North Dakota to the Hudson Bay drainage through the Sheyenne River then Red River. The outlet could potentially transfer parasites and pathogens from Devils Lake into the Hudson Bay drainage to the detriment of fish populations in that basin, especially to commercial and sport fish populations in the Red River and Lake Winnipeg.

Lake Winnipeg has a sustainable $30 million commercial fishery for walleye, sauger, and lake whitefish that is Freshwater Fish Marketing Corporation. In addition to this recorded catch, fishers sell some of their catch directly to the public, and there is a substantial First Nations fishery for local consumption. The Red River supports a significant sport fishery in both the United States and Canada.

In response to the potential threat to downstream aquatic ecosystems in Canada and the United States from the Devils Lake outlet, the International Joint Commission requested that the International Red River Board prepare a proposal that provides:

Phase I: 2007 Summer Field Sampling. The Service proposes to survey key locations in Devil’s lake for aquatic animal pathogens. Under the guidance of the National Wild Fish Health Survey, the project will attempt to sample a statistically valid number from each fish species found in the lake and river systems. This sampling schematic will provide an additional tool to facilitate scientifically defensible management decisions regarding the Devil’s Lake Basin.

Phase II: of the proposal will include a seasonal sampling approach. The occurrence and prevalence of certain fish pathogens may be variably affected by several life history characteristics and elements of environment, especially those causing increased stress.

An annual monitoring program should consider sample collections at two or more times during the year. It may be particularly important and interesting to examine fish during or immediately following spawning activities.

Pathogen Survey Objectives:

1-     Determine the presence, if any, and estimate the prevalence of specific fish pathogens and parasites in resident fish from Devil’s Lake.                                                                                                              

2-     Provide fish health specialists, fisheries managers, and decision makers with a comprehensive pathogen survey report that may be used in performing risk analysis associated with biota transfer from an outlet on Devil’s Lake.

3-     Provide survey results for viewing on the World Wide Web via the U. S. Fish & Wildlife Service National Wild Fish Health Survey database and graphical interface.

Devil’s Lake:

            Based on information provided by North Dakota Game and Fish Department, nine species of fish were known to occur in Devil’s lake and proposed for collection. Species include: Northern pike, Black crappie, fathead minnow, White sucker, White bass, Walleye, Yellow perch.

Analysis of pathogen prevalence:

Samples were assayed for specific fish pathogens according to protocols and procedures for the National Wild Health Survey and the AFS-FHS/FWS Blue Book.

List of primary fish pathogens for the National Wild Fish Health Survey:

Virus:  Channel Catfish Virus, CCV disease

            Infectious Hematopoietic Necrosis Virus, IHN

            Infectious Pancreatic Necrosis Virus, IPN

            Largemouth Bass Virus, LMBV disease

            Oncorhynchus masou Virus, OMV disease

            Viral hemorrhagic septicemia Virus, VHS

Bacteria:  Aeomonas salmonicida, furunculosis and ulcer disease

               Renibacterium salmoninarum, bacterial kidney disease

               Yersinia ruckeri, enteric redmouth disease

               Edwardsiella ictaluri, entericsepticemia of catfish

               Edwardsiella tarda, edwardsiellsis

Parasite:  Myxobolus cerebralis, whirling disease

Two sampling trips will be completed this Summer, one during the week of June 11-15, 2007 and the other during the week of June 25-29, 2007. U.S. Partners included Service Fish Health Laboratories, Bozeman FHC, MT; La Crosse FHC, WI; Dexter FHC, NM;  Spirit Lake First Nation; North Dakota and South Dakota Game & Fish; IJC and International Red River Board (U. S. Representatives).

Results are being processed and the results reported by August, 2007.