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West Coast Vancouver Island Sockeye

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West Coast Vancouver Island Sockeye DFO Science Pacific Region Stock Status Report D6-05 (1999) West Coast Vancouver Island Sockeye Background Anadromous sockeye salmon spend portions of their life cycle in freshwater and marine environments (rivers, lakes, ocean habitats) on both sides of the North Pacific. In the eastern Pacific, sockeye range from the Columbia River to the Bering Sea. Sockeye exhibit great life history The Fishery and Resource Status variation but generally spend their first 1 to 3 years in freshwater lakes, after which they migrate seaward to Average WCVI Sockeye Catch spend another 1-3 years rearing in the North Pacific. (in thousands of fish) Adult sockeye enter coastal fisheries and typically return to spawn in their rivers and lakes of origin between Barkley Sound ages 3 and 6. 1911-30 1931-50 1951-70 1971-90 1991-98 27 46 29 418 383 More than 20 distinctive stocks of sockeye originate from the west coast of Vancouver Island (WCVI). Clayoquot Sound However, more than 80 % of all WCVI sockeye, taken 1887-1910 1911-30 1951-70 1971-90 1991-98 as catch prior to the end of July, originates from stocks 89 60 36 1 0 returning through Barkley Sound to Great Central, Sproat and Henderson lakes. Barkley Sound sockeye have been the subject of more than a century of From the late 1800s to the mid-1900s, terminal management, research and enhancement activities. net fisheries harvested small quantities of sockeye From 1890 to 1972, average returns were less than from several WCVI stocks to supply canneries 100,000 fish. From 1972 to present, lake fertilization at Nitinat Inlet, Barkley and Clayoquot Sounds. and management designed to increase spawner The two largest fisheries occurred in Clayoquot abundance have been used to increase production of and Barkley Sounds, where average annual Barkley Sound sockeye. Annual harvests now average harvests ranged from 27,000 to 89,000 fish. more than 400,000 fish. Although other WCVI sockeye, Smaller quantities were harvested principally for such as the Hobiton, Kennedy, Megin, and Muchalot subsistence purposes at other WCVI sites. stocks, are too unproductive to support commercial Although Clayoquot Sound once supported the harvests, they remain important to First Nations for largest WCVI sockeye fishery, persistent stock food, ceremonial and cultural purposes. declines since early in the century led to the collapse of the fishery in the mid to late 1970s. October 1999 Pacific Region West Cost Vancouver Island Sockeye Stock declines appear to have been related to over- Great Central (1970-73, 1977-98), Henderson exploitation and unfavourable environmental (1976-98) and Sproat Lakes. Lake fertilization in conditions in both freshwater and marine combination with management to increase environments. In spite of 25 years of continuous spawner abundance has been used to increase the closure to commercial fishing, these stocks have production of Barkley Sound sockeye to failed to recover. historically unprecedented levels and has made them the focus of major aboriginal, recreational The history of Barkley Sound sockeye stocks and and commercial fisheries since the early 1970s. fisheries contrasts sharply with that of Clayoquot However, it is doubtful that this would have been Sound. The fishery has passed through several achieved in the absence of the other stock phases including a largely terminal subsistence protection and enhancement activities that have fishery that probably harvested no more than contributed over the past century to the 50,000 sockeye per year (pre-1900); a terminal maintenance or development of the Barkley beach seine and gillnet fishery that provided Sound stocks. catches as high as 125,000 sockeye (1900-40); a more diffuse gillnet fishery that exploited Barkley Sound Sockeye Returns (in thousands) mixtures of sockeye in Alberni Inlet and the outer 2000 Returns depressed by strong El Nino events waters of Barkley Sound yielding catches of 5,000 1800 to 76,000 sockeye (1940-70); and finally, a 1600 mixed-gear, mixed-stock fishery in which gillnet, 1400 purse-seine, recreational and aboriginal fisheries 1200 1000 harvest an average of more than 400,000 sockeye 800 per year (1971-1998). 600 400 Barkley Sound sockeye are currently managed to: 200 0 meet a target of no less than 200,000 adult 1900 1920 1940 1960 1980 2000 spawners to ensure long-term sustainability of the Year stocks, provide for the food, ceremonial and cultural needs of aboriginal peoples, and create Climatic Factors and Stock Status and identify opportunities for surplus sockeye to be taken by recreational and commercial fisheries. Recently, production and catches of Barkley Sound sockeye have declined dramatically. Habitat protection measures have on at least three Research by Fisheries and Oceans Canada has occasions prevented the almost certain destruction shown that marine growth and survival of WCVI of one or more of the Barkley Sound sockeye sockeye, including those from Barkley Sound, are stocks. Gear and area restrictions within the sensitive to periodic variations in ocean climate commercial fishery have been used with varying that occur at intervals of 3 to 20 years. effectiveness throughout the past century to focus Barkley Sound Catch (in thousands) exploitation or stock rebuilding efforts alternately 1991 1992 1993 1994 1995 1996 1997 1998 on Henderson, Great Central or Sproat Lake 1,121 567 738 200 30 55 144 207 sockeye. Stock development and enhancement activities have included: removal of obstructions to fish passage (1901, 1903, 1912-16, 1936); Recurring shifts in ocean climate result in changes construction and maintenance of fishways at in community structure and productivity of both Stamp Falls (1927, 1954), Sproat Falls (1951), coastal and offshore ecosystems where WCVI and the outlet of Great Central Lake (1929, 1957); sockeye spend 1 to 3 years of their life. operation of a sockeye hatchery on Henderson Consequently, returns of several WCVI sockeye Lake (1909-35, 1993-98); and fertilization of stocks (Barkley Sound and Hobiton, for example,) fluctuate together. 2 Pacific Region West Coast Vancouver Island Sockeye sport and commercial harvest, stock declines Barkley Sound vs Hobiton Sockeye Returns associated with the recurrence of strong El Niño Ranked in Order of Abundance for 1975 - 1995 20 events have been severe enough to entirely 18 eliminate commercial harvest there in 1989, 1990, 16 1995 and 1996. These same events have likely 14 contributed to simultaneous declines from 12 thousands of adults to record lows of fewer than 10 8 100 adults returning to each of several small 6 WCVI stocks (e.g. the Muriel Lake and Clayoquot Hobiton Rank 4 Arm stocks in the Kennedy Watershed) even in 2 the absence of any exploitation. 0 0 2 4 6 8 10 12 14 16 18 20 Outlook and Forecasts Barkley Sound Rank Barkley Sound and other WCVI sockeye stocks exhibit highly variable returns in response to a Marine conditions are especially unfavourable for multitude of natural or man-induced changes in juvenile sockeye survival when coastal ocean environmental conditions in both the freshwater temperatures are high and salinities are low and marine ecosystems they occupy throughout because migratory predators, including Pacific their life history. Future returns may be expected hake and mackerel, arrive earlier and in greater to exhibit even more extreme interannual to abundance in such years. Pacific mackerel interdecadal variations because WCVI sockeye reached such high abundance during recent warm stocks reside at the southern end of the range for El Niño summers that ocean survival of sockeye the species where they are likely to be especially that migrated seaward during these years are the sensitive to climate change (e.g. global warming lowest on record for WCVI stocks. Indeed, strong or cooling) and the increasing influence of human El Niño events accompanied by above-average populations on critical freshwater and coastal temperatures in the nearshore marine environment marine habitats. have been followed 2 and 3 years later by declines in sockeye returns throughout the 100-year period Our understanding of the complex mechanisms of records for Barkley Sound sockeye. Research that control both short and long term variations conducted over the past 15 years suggests that in salmon returns is still rudimentary. For juvenile sockeye migrating seaward from WCVI example, we still can’t explain the collapse of the nursery lakes experience survival rates 2 to 5 Clayoquot Sound sockeye stock in the early times higher during years when the coastal ocean 1970’s or its failure to recover in the absence of exhibits cool, high-salinity waters compared with any commercial exploitation for the past 25 years. years when coastal waters are warm and less However, research conducted by federal fisheries saline. scientists over the past decade has provided a basis for new procedures to forecast annual return Rapid changes from one ocean climate state to variations of WCVI sockeye. Recent forecasts of another can lead to steep increases or dramatic total returns of sockeye are based on models that “crashes” in WCVI sockeye returns. Prior to the account for annual variations in marine survival, 1992-94 El Niño event, for example, Barkley as well as the abundance of juvenile sockeye Sound sockeye returns peaked at almost 2 million migrating seaward from various nursery lakes. fish in 1991 followed by a 10-fold decline to only Marine survival predictions are based on direct 200,000 returning fish in 1995. Although Barkley observations of strong associations between Sound sockeye returns have remained high coastal ocean climate indicators (salinity and enough in most recent years to satisfy spawning temperature during ocean entry by juveniles) and requirements as well as to support aboriginal, 3 Pacific Region West Cost Vancouver Island Sockeye return rates. Pre-season forecasts generated or: annually since 1988 have been applied with excellent success by fisheries managers to Contact anticipate when to plan for either strict stock Wilf Luedke conservation or progressive harvest measures for Stock Assessment Division WCVI sockeye.
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