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Piscine Prospecting: Fish Inventories in Yukon-Charley Rivers National Preserve Nate Cathcart and Joe Giefer

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Piscine Prospecting: Fish Inventories in Yukon-Charley Rivers National Preserve Nate Cathcart and Joe Giefer Piscine Prospecting: Fish Inventories in Yukon-Charley Rivers National Preserve Nate Cathcart and Joe Giefer 3 American Currents Vol. 45, No. 4 PISCINE PROSPECTING: FISH INVENTORIES IN YUKON-CHARLEY RIVERS NATIONAL PRESERVE Nate Cathcart and Joe Giefer Alaska Department of Fish & Game, Division of Sport Fish – Research and Technical Services, Alaska Freshwater Fish Inventory Program, Anchorage, AK INTRODUCTION Each year AFFI staff identify a project area with a high con- The Alaska Freshwater Fish Inventory (AFFI) program was es- centration of water bodies with limited or no fish-distribution tablished by the Alaska Department of Fish & Game (ADF&G) information. Typically, helicopters are used to access remote in 2002. Tasked with documenting freshwater fish species as- areas where rapid, systematic fish inventories are performed us- semblages throughout the state, this program’s annual inven- ing multiple gear types including electrofishers, minnow traps, tories are a major contributor to ADF&G’s “Catalog of Waters seines, and angling. Data on aquatic and riparian habitats are Important for the Spawning Rearing or Migration of Anadro- also gathered at each site. Ultimately, the information collected mous Fishes,” also known as the Anadromous Waters Catalog is added to the AFFI database and streams found to support (AWC). Alaska state law affords special protection to lakes and anadromous fish species are nominated to the AWC. All col- rivers that support anadromous fish species under the Anad- lected data are available through an interactive mapping ap- romous Fish Act (Alaska Statute 16.05.871). Qualifying water plication available on the ADF&G website at http://www.adfg. bodies are recorded in the AWC. There are physical maps and alaska.gov/index.cfm?adfg=ffinventory.interactive. The mapper an online mapping application of the AWC that specify the is updated every June. location and extent of water bodies that are documented by ADF&G to support anadromous fishes and are therefore pro- 2019 PROJECT BACKGROUND tected by state law. Anadromous describes a life history strat- In 2019, the Alaska Sustainable Salmon Fund funded AFFI staff egy where fish are born in freshwater, migrate to the ocean to collaborate with the National Park Service (NPS) to work as juveniles, then return to fresh water to spawn as adults. out of Coal Creek Camp and sample fishes in streams within Well known species of anadromous fishes in Alaska are the or tributary to Yukon-Charley National Preserve (YUCH), a five species of Pacific salmon, but there are at least 21 species park in far eastern interior Alaska along the upper Yukon River. of anadromous fishess documented in Alaska including Dolly This area is important to inventory because it contains known Varden Salvelinus malma and Inconnu Stenodus leucichthys. spawning habitats of Chinook Salmon Oncorhynchus tshawyts- These inventory efforts also document the various freshwater cha and Chum Salmon O. keta, but it has relatively limited doc- resident fish species such as Round Whitefish Prosopium cylin- umentation of juvenile Chinook Salmon rearing habitat. This draceum, Longnose Sucker Catostomus catostomus, Northern area not only serves as a corridor for migrating spawning salm- Pike Esox lucius, and Burbot Lota lota. Some Alaskan fish spe- on and habitat for rearing juvenile salmon but also supports cies have variable life histories where one drainage supports subsistence fishers who rely on harvesting these (and other) populations of both freshwater resident and anadromous life fishes in eastern Alaska and the Yukon Territory, Canada. Thus, histories such as Dolly Varden, Rainbow Trout Oncorhynchus knowing the distribution of all age classes of salmon in this area mykiss, and Inconnu. can more accurately portray how the landscape contributes to salmon species of commercial and subsistence importance. Photos by the authors. Nate Cathcart, Habitat Biologist II, ADF&G Division of Sport of field and technical research experience to the AFFI program. Fish, Anchorage. Mr. Cathcart joined the AFFI program in 2018 Joe Giefer, Habitat Biologist III, ADF&G Division of Sport and served as the program’s Fish & Wildlife Technician III for two Fish, Anchorage. Mr. Giefer was hired into the AFFI program field seasons prior to promotion to his current position as proj- in October 2013 but has participated as a crew member during ect biologist in October 2019. Earning a Bachelor’s degree from multiple AFFI surveys since 2005. He has 15 years of experience Colorado State University and a Master’s degree from Kansas as a Habitat Biologist with the Division of Sport Fish. He has a State University, Mr. Cathcart has a variety of research experience Bachelor’s degree in Fisheries and Wildlife Biology from Utah from studying Razorback Sucker and Colorado Pikeminnow mi- State University. Mr. Giefer is currently the project biologist for grations in the Colorado River Basin to quantifying logjam use the department’s Anadromous Water Program and supervisor by juvenile Chinook Salmon in Alaska. He has published and co- for the AFFI programs project biologist. authored several articles for fisheries journals and brings a wealth Both authors are from Minnesota, just south of the Twin Cities. Fall 2020 American Currents 4 native North American Athabascan groups: the Gwich’in and the Han. The name “Gwich’in” generally translates as “people who live at a certain place,” with most Gwich’in bands speci- fied by a landmark or feature, such as a specific river, whereas Han translates as “people of the [Yukon] River.” Artifacts indi- cate human occupation over 4,000 years ago within YUCH but nearby areas of the upper Yukon River drainage have ancient Athabascan sites dated in excess of 14,000 years ago (Buvit and Rasic 2011). Early use and eventual settlement of this region is thought to have occurred due to the unglaciated Yukon River being an important travel corridor to access productive hunting areas (Buvit and Rasic 2011). Euro-American trappers and traders did not arrive until the mid-1800s, but their pioneering legacy inspired mining and entre- preneurship at the turn of the century. In the 1890s along the Yu- kon River, the thick spruce forests interwoven with rocky streams near the Alaskan-Canadian border served as the backdrop for the Klondike gold rush that spilled over into Alaska (Allan 2015). The landscape that sustained people with fish, game, and forage for millennia was transformed into booming, short-lived communi- ties of prospectors seeking the earth’s riches. The rush dissipated, causing most miners to abandon the area and, if still willing, to chase rumors of gold elsewhere. Today, this land supports far less people than it did 120 years ago, yet vestiges of past prospecting remain among the wilder- ness. In 1980, the Alaska National Interest Lands Claim Act (ANILCA) was signed into law by President Jimmy Carter, creat- Figure 1. Study area and surveyed sites of Yukon-Charley ing YUCH among many other conservation units managed by the National Preserve and surrounding drainages that Alaska NPS, Bureau of Land Management, and the Fish & Wildlife Ser- Freshwater Fish Inventory program staff sampled in August vice (National Park Service 2012). Some larger-scale gold mining 2019. Site numbers correspond to waterbodies in Tables 1, 2, operations, such as at Coal Creek Camp, continued into the 1980s and 3. (Allan 2015). In 1980, not only did ANILCA create YUCH, but the United States Congress designated the entire Charley River water- STUDY AREA AND HISTORY shed (1.1 million acres) as part of the National Wild and Scenic Excluding the Yukon River upstream of the border with Canada, Rivers System. Now, the YUCH and surrounding river corridors the YUCH portion of the 2019 study drains 7,728 mi2 of the up- are strongholds for Peregrine Falcon, Caribou, and Dall Sheep per Yukon River basin (Figure 1). The study area landscape was while still supporting gold mining, subsistence fisheries (where within the Yukon-Tanana Uplands and is largely made up of fishwheels and gillnets target anadromous salmon and migratory low, rolling mountains, although the headwaters of the Charley whitefish), and outdoor recreation such as rafting (National Park River drain peaks of the Ogilvie Mountains that exceed 5,000 ft Service 2012). tall. Spruce forest underlain by permafrost is interspersed across boggy lowlands, especially within the Yukon River corridor. This METHODS study involves rivers within and accessible by YUCH including Using ArcMap GIS software, we defined two stream size the Yukon and its smaller tributaries, totaling 1,837 mi2 of drain- classes based on upstream drainage (catchment) area: “head- age, Charley (1,728 mi2), Kandik (1,186 mi2), Nation (950 mi2), water” stream sites that drain an approximately 20 mi2 (50 Tatonduk (1,379 mi2), and Seventymile (648 mi2). Some streams km2) catchment and “un-wadeable” stream sites that drain an and watersheds herein had been previously sampled by aerial sur- approximately 77 mi2 (200 km2) catchment. From these two veys, telemetry, and minnow trapping but lacked extensive spatial classes, downstream points are created, which are used as tar- coverage in many areas, especially on tributaries to the Charley, get sample sites and prioritized depending on the amount of Seventymile, and Yukon rivers (Daum and Flannery 2011; John- potential mileage that could be added to the AWC. Headwater son and Blossom 2019). Although the border of YUCH ends at its sites are wadeable streams where backpack electrofishing is mouth, the Seventymile River was included in this report because used whereas un-wadeable streams require raft-mounted elec- anadromous fishes using this watershed must travel through trofishing to sample. Often, tributary sites were sampled near YUCH. Similarly, sites on tributaries to streams flowing through confluences with larger rivers because they have been demon- YUCH yet outside its border, such as those on tributaries of the strated to be productive areas for juvenile salmon catch (e.g., Nation and Kandik rivers are also included.
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