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Dolly Varden (Salvelinus Malma) Data: Alaska Department of Fish & Game Partners: AK______

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Dolly Varden (Salvelinus Malma) Data: Alaska Department of Fish & Game Partners: AK______ Dolly Varden (Salvelinus malma) Data: Alaska Department of Fish & Game Partners: AK__________________________ Species Status Review: into the various saltwater habitats. Freshwater habitat requirements of Dolly Varden range from Populations of Dolly Varden are generally headwater streams to large deep lakes and large thought to be stable throughout Alaska with some rivers. Saltwater habitat ranges from estuaries concerns about specific stocks, primarily around and coastal shorelines to the open ocean. urban centers. Unimpeded migrations within and between freshwater habitats and passage to and from the Sportfishing Status of Dolly Varden: ocean are essential to maintain the different life histories expressed by Dolly Varden populations. Dolly Varden are a popular sport and subsistence fish throughout much of their range. Annually, Range of Dolly Varden: sport anglers in Alaska catch approximately 500,000 and harvest over 50,000 fish. The range of Dolly Varden extends throughout the coastal areas of the state from Southeast Distribution of Dolly Varden: Alaska across the Gulf of Alaska and the Bering Sea into the Chukchi and Beaufort seas to the Dolly Varden are the most widely-distributed Mackenzie River in northern Canada. Dolly salmonid in Alaska and occupy most coastal Varden also occur in streams in Interior Alaska waters in the state. Two forms or sub-species of and the Brooks Range. Elsewhere, their range Dolly Varden have been described in Alaska. stretches along the Pacific coast of North The northern (S. m. malma) form is distributed America from Washington to the Arctic coast of from the Mackenzie River to the north side of the Canada, and along the Pacific coast of Asia from Alaska Peninsula while the southern form (S. m. Russia south to Japan and Korea. lordi) is distributed on the south side of the Alaska Peninsula to the southern tip of Southeast Alaska, including Kodiak and the Aleutian Islands. The distribution of each form has changed in recent years with knowledge gained from genetic analysis. Both forms have anadromous and stream-resident forms but the lacustrine (lake dwelling) form is rare in the northern form but common in the southern form. The forms may differ greatly in the distance they travel during their marine migrations (Crane et al. 2004). The southern form typically migrates 60 km while the northern form may migrate much further and have been documented migrating from northwest Alaska to Russian freshwaters to Concerns, Issues, or Obstacles relative to the spawn or overwinter (DeCicco 1997). Conservation and Improvement of the status of Dolly Varden: Dolly Varden Habitat Requirements: Population Viability Concerns Dolly Varden typically spend most of their time in cool, freshwater habitats but may also migrate None to date. Western Native Trout Status report 1 Dolly Varden (Salvelinus malma) Genetic Considerations Introduced Species Concerns To date there are no concerns regarding While northern form Dolly Varden migrate home interactions with introduced species. However, to their natal stream to spawn, tagging studies Dolly Varden apparently can hybridize with have shown that overwintering fish can be from introduced brook trout possibly producing fertile multiple river systems (DeCicco 1997; offspring. Between 1917 and 1950, brook trout Armstrong and Morrow 1980). This suggests were stocked in many streams and lakes in that subsistence and sport harvests in a particular Southeast Alaska. Since then, they have location may be comprised of populations from disappeared from all but about 20 lakes. Much of several different natal streams (Everett et al. the brook trout stocking occurred in areas already 1997). Mixed-stock analysis using genetic data occupied with native Dolly Varden. No genetic can provide an effective method for estimating studies have been performed to evaluate the the stock composition of Dolly Varden impact these brook trout may have had on Dolly aggregations in overwintering areas and fishery Varden populations. Introduction of other harvests (Crane et al. 2005). A key management salmonids through barrier removal or aquaculture objective for effective management of practices could increase competition for subsistence fisheries is to estimate stock resources. composition and relative contributions harvested. Overutilization Concerns Disease Concerns There is currently little concern regarding over There are no specific disease concerns that are utilization of Dolly Varden in Alaska. In the past not addressed in existing policies designed to there have been concerns for localized stocks prevent the introduction or spread of pathogens. around larger communities. These concerns have lead to the adoption of regulations reducing bag Habitat Concerns and possession limits. Monitoring of angler catch and harvest in these areas should continue. Major habitat concerns are related to the development of hydroelectric dams and Oil and Gas Development Concerns introduction of other salmonid species as part of salmon aquaculture programs. Localized Natural resource development may present populations of Dolly Varden are also vulnerable significant challenges for the health of many to urbanization and other land use activities such Dolly Varden populations. In Alaska, oil and gas as mining, logging, gas development and road exploration occurs on a large scale on the North construction. Also, climate change may have Slope, and development of mineral extraction profound effects on Dolly Varden, including projects are beginning on the Alaska Peninsula. changes in marine environment movement As resource development increases in Alaska, patterns resulting from alterations in ocean environmental monitoring and utilization of productivity and fish metabolism. Additionally, mechanisms to protect fish habitats will there may be shifts in the location and usage of continue to be important to minimize impacts to overwintering areas resulting from alterations in Dolly Varden populations. stream discharge and freeze cycles (Crane et al. 2005). Western Native Trout Status report Dolly Varden (Salvelinus malma) Opportunities and Strategies for Improving Habitat Manipulations: Dolly Varden Status: Key Actions: Restoration of disturbed habitat following mining or other human activities. Protect existing habitat to maintain Removal of barriers to migration caused by distribution. human activities. Secure reservations of water to protect Obtain reservations of water to protect and Dolly Varden habitat. maintain existing populations of Dolly Varden. Monitor potential climate change effects on Genetic studies to identify and better define habitat. origins of mixed-stocks of Dolly Varden Regulatory and Administrative Actions: Population surveys, genetic analyses, and fish population manipulation: Harvest regulations and collecting reliable harvest data to maintain sustainable harvests will Conduct stock assessments of Dolly Varden be an important component of maintaining the populations utilized by subsistence fisheries. health of Dolly Varden populations. In addition, Use mixed-stock analysis to obtain stock- working with other entities to maintain specific information to further identify important appropriate regulations for prevention of disease, overwintering aggregates. water quality impairment, and habitat disturbance Maintain and enforce existing regulatory are important considerations. statutes (fishing regulations, water use, land management, etc.). Key Actions: Use stock assessment tools like radio and Maintain and protect Dolly Varden habitat satellite telemetry and mark/recapture from degradation by achieving compliance experiments to better understand their with existing habitat protection laws, policies, movements and populations dynamics. and guidelines. Key Actions: Enforce regulatory mechanisms that prevent negative impacts associated with subsistence Continue management regulations to users and recreational angling. maintain current distribution Identify and protect unique genetic Characterize, conserve, and monitor populations of Dolly Varden. genetic diversity of Dolly Varden. Develop methodology and implement Recommended Actions to improve the status standardized surveys and genetic analyses. of Dolly Varden: Locate and assess genetically unique populations. 1. Conduct fish surveys to identify and Minimize potential effects of resource document distribution of Dolly Varden development. 2. Conduct genetic analysis to evaluate and Conduct periodic stock status assessments on identify unique stocks of Dolly Varden. exploited populations. 3. Maintain and enforce regulatory actions Attempt to understand the degree to which related to water and land use, as well as western Alaska Dolly Varden interact with sport and subsistence fisheries. Russian Far East Dolly Varden, and 4. Describe marine movements, feeding consequently their associated habitats and behavior, and use of Russian Far East fishing pressures. freshwaters. Western Native Trout Status report Dolly Varden (Salvelinus malma) Completed or on-going WNTI Projectsa 1. Protect Coastal Cutthroat Habitat via Water Reservations in SE AK (71440-2009-916). 2. Protect Coastal Cutthroat Habitat in SE Alaska Water reservations Phase II (71440- 2012-938). a Both Dolly Varden and kokanee habitat will be protected by obtaining water reservations under these coastal cutthroat trout projects. References: Armstrong, R. H. and J. E. Morrow. 1980. The Dolly Varden charr, Salvelinus malma. Pages 99-140 in Balon, E., editor. Charrs: salmonid
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