Search

Search Results

• 11. [Article] 2006 Borax Lake Chub Investigations Progress Reports 2006

  Abstract -- Borax Lake chub (Gila boraxobius) is represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake in Harney County, Oregon. The Borax Lake chub is a small ...

  Citation × Citation Citation Abstract Copy Title: 2006 Borax Lake Chub Investigations Progress Reports 2006 Abstract -- Borax Lake chub (Gila boraxobius) is represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake in Harney County, Oregon. The Borax Lake chub is a small minnow endemic to Borax Lake and adjacent wetlands in Oregon’s Alvord Basin (Williams and Bond 1980). Borax Lake is a natural lake, perched 10 meters above the desert floor on sinter deposits, which is fed almost exclusively by thermal groundwater. The Borax Lake chub was listed as endangered under the federal Endangered Species Act in 1982 (U.S. Fish and Wildlife Service 1982). Population abundance estimates obtained in 1991-1996 indicated a fluctuating population ranging from a low of 8,144 fish to a high of 34,634 fish (Salzer 1997). The basis for the Borax Lake chub’s listed status was not population size, but the security of a very limited, unique, isolated, and vulnerable habitat. Because Borax Lake is situated above salt deposits on the desert floor, alteration of the salt crust shoreline could reduce lake levels and the habitat quantity and quality available to Borax Lake chub. At the time of the listing, Borax Lake was threatened by habitat alteration caused by geothermal energy development and alteration of the lake shore crust to provide irrigation to surrounding pasture lands. The Borax Lake chub federal recovery plan, completed in 1987, advocated protection of the lake ecosystem through the acquisition of key private lands, protection of groundwater and surface waters, controls on access, and the removal of livestock grazing (U.S. Fish and Wildlife Service 1987). Numerous recovery measures implemented since listing have improved the conservation status of Borax Lake chub and protection of its habitat (Williams and Macdonald 2003). When the species was listed, critical habitat was designated on 259 hectares of land surrounding the lake, including 129 hectares of public lands and two 65- hectare parcels of private land. In 1983, the U.S. Bureau of Land Management designated the public land as an Area of Critical Environmental Concern. The Nature Conservancy began leasing the private lands in 1983 and purchased them in 1993, bringing the entire critical habitat into public or conservation ownership. The Nature Conservancy ended water diversion from the lake for irrigation and livestock grazing within the critical habitat. Passage of the Steens Mountain Cooperative Management and Protection Act of 2000 removed the public BLM lands from mineral and geothermal development within a majority of the basin. These actions, combined with detailed studies of the chub and their habitat have added substantially to our knowledge of the Borax Lake ecosystem (Scoppettone et al. 1995, Salzer 1992, Perkins et al. 1996). However, three primary threats remain. These include the threat to the fragile lake shoreline, wetlands, and soils from a recent increase in recreational use around the lake (particularly off-road vehicle usage), the threat of introduction of nonnative species, and potential negative impacts to the aquifer from geothermal groundwater withdrawal if groundwater pumping were to occur on private lands outside the protected areas (Williams and Macdonald 2003). Although an increase in abundance is not a goal in the successful recovery of this species, monitoring trends in abundance over time is an important management tool to assess species status. From 1998-2004, data describing the abundance of the Borax Lake chub population are not available. Abundance estimates were obtained from 1986- 1997 by The Nature Conservancy (Salzer 1997) (Figure 1). Abundance estimates for 1986-1990 are not comparable with those obtained in 1991-1997. Prior to 1991, estimates were obtained only from traps set around the perimeter of the lake. In 1991, estimates were obtained from traps set on a regularly spaced grid throughout the lake. A study comparing the methods suggests that prior to 1991 abundance was under estimated, perhaps by as much as 50 percent (Salzer 1992). A recent review of the conservation status of the Borax Lake chub by Williams and Macdonald (2003) cited the lack of recent and ongoing population and ecosystem monitoring as one argument against downlisting or delisting the species at this time. The chub population has experienced substantial fluctuations in abundance over the time period (1986-1997) when abundance data are available (Figure 1). At the time of the review, the most recent abundance estimates that were obtained in 1996 and 1997 were some of the lowest estimates since 1991. Borax Lake chub population abundance estimates from 1986 to 1997 and 2005 to 2006. Horizontal bars represent 95% confidence limits. In 1986-1990 (solid symbols), only the perimeter of the lake was trapped. After 1990 (open symbols) the entire lake was trapped. Estimates are not directly comparable across these time periods. There are limited data on population age structure that offer valuable insight into the productivity of Borax Lake chub. Williams and Bond (1983) examined lengthfrequency data and concluded that the population consisted primarily of age 1 fish, with few age 2 and age 3 fish present. Limited opercle bone aging of chub collected in 1992- 1993 also indicated that most Borax Lake were less than one year of age (67-79%), yet a few individuals were aged at 10+ years (Scoppettone 1995). Because Borax Lake chub are only found in one location and the population is apparently dominated by a single year-class of adults, the species has a high inherent risk of extinction. 3 The objectives of this study were to: 1) obtain a mark-recapture population estimate of Borax Lake chub, and 2) to evaluate ways to reduce handling of Borax Lake chub when monitoring population abundance both by modifying previous mark-recapture protocols and by developing snorkeling survey protocols to use as an alternative to mark-recapture estimates. In addition, we collected data regarding lake temperatures, chub size (age) structure, and the condition of the fragile lake shoreline and outflows. Title: 2006 Borax Lake Chub Investigations Progress Reports 2006 Abstract -- Borax Lake chub (Gila boraxobius) is represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake in Harney County, Oregon. The Borax Lake chub is a small minnow endemic to Borax Lake and adjacent wetlands in Oregon’s Alvord Basin (Williams and Bond 1980). Borax Lake is a natural lake, perched 10 meters above the desert floor on sinter deposits, which is fed almost exclusively by thermal groundwater. The Borax Lake chub was listed as endangered under the federal Endangered Species Act in 1982 (U.S. Fish and Wildlife Service 1982). Population abundance estimates obtained in 1991-1996 indicated a fluctuating population ranging from a low of 8,144 fish to a high of 34,634 fish (Salzer 1997). The basis for the Borax Lake chub’s listed status was not population size, but the security of a very limited, unique, isolated, and vulnerable habitat. Because Borax Lake is situated above salt deposits on the desert floor, alteration of the salt crust shoreline could reduce lake levels and the habitat quantity and quality available to Borax Lake chub. At the time of the listing, Borax Lake was threatened by habitat alteration caused by geothermal energy development and alteration of the lake shore crust to provide irrigation to surrounding pasture lands. The Borax Lake chub federal recovery plan, completed in 1987, advocated protection of the lake ecosystem through the acquisition of key private lands, protection of groundwater and surface waters, controls on access, and the removal of livestock grazing (U.S. Fish and Wildlife Service 1987). Numerous recovery measures implemented since listing have improved the conservation status of Borax Lake chub and protection of its habitat (Williams and Macdonald 2003). When the species was listed, critical habitat was designated on 259 hectares of land surrounding the lake, including 129 hectares of public lands and two 65- hectare parcels of private land. In 1983, the U.S. Bureau of Land Management designated the public land as an Area of Critical Environmental Concern. The Nature Conservancy began leasing the private lands in 1983 and purchased them in 1993, bringing the entire critical habitat into public or conservation ownership. The Nature Conservancy ended water diversion from the lake for irrigation and livestock grazing within the critical habitat. Passage of the Steens Mountain Cooperative Management and Protection Act of 2000 removed the public BLM lands from mineral and geothermal development within a majority of the basin. These actions, combined with detailed studies of the chub and their habitat have added substantially to our knowledge of the Borax Lake ecosystem (Scoppettone et al. 1995, Salzer 1992, Perkins et al. 1996). However, three primary threats remain. These include the threat to the fragile lake shoreline, wetlands, and soils from a recent increase in recreational use around the lake (particularly off-road vehicle usage), the threat of introduction of nonnative species, and potential negative impacts to the aquifer from geothermal groundwater withdrawal if groundwater pumping were to occur on private lands outside the protected areas (Williams and Macdonald 2003). Although an increase in abundance is not a goal in the successful recovery of this species, monitoring trends in abundance over time is an important management tool to assess species status. From 1998-2004, data describing the abundance of the Borax Lake chub population are not available. Abundance estimates were obtained from 1986- 1997 by The Nature Conservancy (Salzer 1997) (Figure 1). Abundance estimates for 1986-1990 are not comparable with those obtained in 1991-1997. Prior to 1991, estimates were obtained only from traps set around the perimeter of the lake. In 1991, estimates were obtained from traps set on a regularly spaced grid throughout the lake. A study comparing the methods suggests that prior to 1991 abundance was under estimated, perhaps by as much as 50 percent (Salzer 1992). A recent review of the conservation status of the Borax Lake chub by Williams and Macdonald (2003) cited the lack of recent and ongoing population and ecosystem monitoring as one argument against downlisting or delisting the species at this time. The chub population has experienced substantial fluctuations in abundance over the time period (1986-1997) when abundance data are available (Figure 1). At the time of the review, the most recent abundance estimates that were obtained in 1996 and 1997 were some of the lowest estimates since 1991. Borax Lake chub population abundance estimates from 1986 to 1997 and 2005 to 2006. Horizontal bars represent 95% confidence limits. In 1986-1990 (solid symbols), only the perimeter of the lake was trapped. After 1990 (open symbols) the entire lake was trapped. Estimates are not directly comparable across these time periods. There are limited data on population age structure that offer valuable insight into the productivity of Borax Lake chub. Williams and Bond (1983) examined lengthfrequency data and concluded that the population consisted primarily of age 1 fish, with few age 2 and age 3 fish present. Limited opercle bone aging of chub collected in 1992- 1993 also indicated that most Borax Lake were less than one year of age (67-79%), yet a few individuals were aged at 10+ years (Scoppettone 1995). Because Borax Lake chub are only found in one location and the population is apparently dominated by a single year-class of adults, the species has a high inherent risk of extinction. 3 The objectives of this study were to: 1) obtain a mark-recapture population estimate of Borax Lake chub, and 2) to evaluate ways to reduce handling of Borax Lake chub when monitoring population abundance both by modifying previous mark-recapture protocols and by developing snorkeling survey protocols to use as an alternative to mark-recapture estimates. In addition, we collected data regarding lake temperatures, chub size (age) structure, and the condition of the fragile lake shoreline and outflows. Close

• 12. [Article] Standard operating procedures for collection and preparation of fish scales and data management

  Abstract -- The project maintains high standards of quality in estimation of life history parameters, based on reads of fish scales, including accuracy, precision and efficiency from sample and data handling ...

  Citation × Citation Citation Abstract Copy Title: Standard operating procedures for collection and preparation of fish scales and data management Abstract -- The project maintains high standards of quality in estimation of life history parameters, based on reads of fish scales, including accuracy, precision and efficiency from sample and data handling through age estimations and other life history analyses and data dissemination. Title: Standard operating procedures for collection and preparation of fish scales and data management Abstract -- The project maintains high standards of quality in estimation of life history parameters, based on reads of fish scales, including accuracy, precision and efficiency from sample and data handling through age estimations and other life history analyses and data dissemination. Close

• 13. [Article] Development of a system-wide Predator Control Program: Indexing and Fisheries Evaluation - Columbia and Snake Rivers

  Abstract -- The Northern Pikeminnow Management Program (NPMP), a fishery aimed at reducing predation on juvenile salmonids by northern pikeminnow (Ptychocheilus oregonensis), was implemented for the 16th ...

  Citation × Citation Citation Abstract Copy Title: Development of a system-wide Predator Control Program: Indexing and Fisheries Evaluation - Columbia and Snake Rivers Abstract -- The Northern Pikeminnow Management Program (NPMP), a fishery aimed at reducing predation on juvenile salmonids by northern pikeminnow (Ptychocheilus oregonensis), was implemented for the 16th consecutive year in the mainstem Columbia and Snake rivers. We report on (1) northern pikeminnow exploitation rates, predation estimates, spaghetti tag loss rates, and age validation work; (2) population parameters of northern pikeminnow, smallmouth bass (Micropterus dolomieu), and walleye (Sander vitreus) in The Dalles and John Day reservoirs, and (3) possible compensatory responses by these species. Title: Development of a system-wide Predator Control Program: Indexing and Fisheries Evaluation - Columbia and Snake Rivers Abstract -- The Northern Pikeminnow Management Program (NPMP), a fishery aimed at reducing predation on juvenile salmonids by northern pikeminnow (Ptychocheilus oregonensis), was implemented for the 16th consecutive year in the mainstem Columbia and Snake rivers. We report on (1) northern pikeminnow exploitation rates, predation estimates, spaghetti tag loss rates, and age validation work; (2) population parameters of northern pikeminnow, smallmouth bass (Micropterus dolomieu), and walleye (Sander vitreus) in The Dalles and John Day reservoirs, and (3) possible compensatory responses by these species. Close

• 14. [Article] Grande Ronde River Subbasin Salmonid Juvenile Life History Study - Migratory Year 2016

  Abstract -- Field data from the Grande Ronde River Subbasin (northeast Oregon) for a study designed to document and describe status and life history strategies of spring Chinook salmon and summer steelhead. ...

  Citation × Citation Citation Abstract Copy Title: Grande Ronde River Subbasin Salmonid Juvenile Life History Study - Migratory Year 2016 Abstract -- Field data from the Grande Ronde River Subbasin (northeast Oregon) for a study designed to document and describe status and life history strategies of spring Chinook salmon and summer steelhead. Data include rotary screw trap catch and associated trap efficiency estimates, length and weight data for spring Chinook salmon and summer steelhead, age data for summer steelhead, and water temperature and discharge data for select streams in the Grande Ronde River Subbasin. Title: Grande Ronde River Subbasin Salmonid Juvenile Life History Study - Migratory Year 2016 Abstract -- Field data from the Grande Ronde River Subbasin (northeast Oregon) for a study designed to document and describe status and life history strategies of spring Chinook salmon and summer steelhead. Data include rotary screw trap catch and associated trap efficiency estimates, length and weight data for spring Chinook salmon and summer steelhead, age data for summer steelhead, and water temperature and discharge data for select streams in the Grande Ronde River Subbasin. Close

• 15. [Article] Little Sheep Creek, Imnaha River Subbasin, Rotary Screw Trap Data - Migratory Year 2016

  Abstract -- Field data from Little Sheep Creek, Imnaha River Subbasin (northeast Oregon)for a project designed to collect tissue samples from and enumerate summer steelhead outmigrants for an ongoing study ...

  Citation × Citation Citation Abstract Copy Title: Little Sheep Creek, Imnaha River Subbasin, Rotary Screw Trap Data - Migratory Year 2016 Abstract -- Field data from Little Sheep Creek, Imnaha River Subbasin (northeast Oregon)for a project designed to collect tissue samples from and enumerate summer steelhead outmigrants for an ongoing study of the relative reproductive success (RRS) of natural and hatchery origin summer steelhead adults released to spawn in the wild. Title: Little Sheep Creek, Imnaha River Subbasin, Rotary Screw Trap Data - Migratory Year 2016 Abstract -- Field data from Little Sheep Creek, Imnaha River Subbasin (northeast Oregon)for a project designed to collect tissue samples from and enumerate summer steelhead outmigrants for an ongoing study of the relative reproductive success (RRS) of natural and hatchery origin summer steelhead adults released to spawn in the wild. Close

• 16. [Article] 2016 Oregon pink shrimp biological sampling data

  Abstract -- The Oregon pink shrimp fishery depends on Virtual Population Analysis (VPA) to form a Virtual Population Estimate (VPE) for appropriate management. Two key metrics are incorporated into each ...

  Citation × Citation Citation Abstract Copy Title: 2016 Oregon pink shrimp biological sampling data Abstract -- The Oregon pink shrimp fishery depends on Virtual Population Analysis (VPA) to form a Virtual Population Estimate (VPE) for appropriate management. Two key metrics are incorporated into each VPE, 1) abundance (pounds of shrimp caught in each area) and 2) catch composition (size and age of shrimp by each month and area). This data describes the catch composition by year of shrimp biological sampling. These data are raw, to allow flexible analysis. Previous data published by Zirges, then Hannah/Jones shows summaries from time periods. These data are regarding the pink shrimp delivered into Oregon ports in 2016. Title: 2016 Oregon pink shrimp biological sampling data Abstract -- The Oregon pink shrimp fishery depends on Virtual Population Analysis (VPA) to form a Virtual Population Estimate (VPE) for appropriate management. Two key metrics are incorporated into each VPE, 1) abundance (pounds of shrimp caught in each area) and 2) catch composition (size and age of shrimp by each month and area). This data describes the catch composition by year of shrimp biological sampling. These data are raw, to allow flexible analysis. Previous data published by Zirges, then Hannah/Jones shows summaries from time periods. These data are regarding the pink shrimp delivered into Oregon ports in 2016. Close

• 17. [Article] A Survey of Shrimp Abundance, Sex Composition, Bycatch and Trawl Gear Performance on the Northern Oregon Shrimp Grounds - Fall 2004, Information Reports 2005-01

  Abstract -- This reports summarizes the sampling activities and results from a fall 2004 research cruise to investigate selected aspects of the ecology of the ocean shrimp (Pandalus jordani) grounds as ...

  Citation × Citation Citation Abstract Copy Title: A Survey of Shrimp Abundance, Sex Composition, Bycatch and Trawl Gear Performance on the Northern Oregon Shrimp Grounds - Fall 2004, Information Reports 2005-01 Abstract -- This reports summarizes the sampling activities and results from a fall 2004 research cruise to investigate selected aspects of the ecology of the ocean shrimp (Pandalus jordani) grounds as they relate to the commercial shrimp trawl fishery. The cruise investigated questions related to the fine-scale distribution of shrimp by age, sex and depth as well as the species composition of juvenile rockfish bycatch in the fishery. Title: A Survey of Shrimp Abundance, Sex Composition, Bycatch and Trawl Gear Performance on the Northern Oregon Shrimp Grounds - Fall 2004, Information Reports 2005-01 Abstract -- This reports summarizes the sampling activities and results from a fall 2004 research cruise to investigate selected aspects of the ecology of the ocean shrimp (Pandalus jordani) grounds as they relate to the commercial shrimp trawl fishery. The cruise investigated questions related to the fine-scale distribution of shrimp by age, sex and depth as well as the species composition of juvenile rockfish bycatch in the fishery. Close

• 18. [Article] 2017 Oregon pink shrimp biological sampling data

  Abstract -- The Oregon pink shrimp fishery depends on Virtual Population Analysis (VPA) to form a Virtual Population Estimate (VPE) for appropriate management. Two key metrics are incorporated into each ...

  Citation × Citation Citation Abstract Copy Title: 2017 Oregon pink shrimp biological sampling data Abstract -- The Oregon pink shrimp fishery depends on Virtual Population Analysis (VPA) to form a Virtual Population Estimate (VPE) for appropriate management. Two key metrics are incorporated into each VPE, 1) abundance (pounds of shrimp caught in each area) and 2) catch composition (size and age of shrimp by each month and area). This data describes the catch composition by year of shrimp biological sampling. These data are raw, to allow flexible analysis. Previous data published by Zirges, then Hannah/Jones shows summaries from time periods. These data are regarding the pink shrimp delivered into Oregon ports in 2017. Title: 2017 Oregon pink shrimp biological sampling data Abstract -- The Oregon pink shrimp fishery depends on Virtual Population Analysis (VPA) to form a Virtual Population Estimate (VPE) for appropriate management. Two key metrics are incorporated into each VPE, 1) abundance (pounds of shrimp caught in each area) and 2) catch composition (size and age of shrimp by each month and area). This data describes the catch composition by year of shrimp biological sampling. These data are raw, to allow flexible analysis. Previous data published by Zirges, then Hannah/Jones shows summaries from time periods. These data are regarding the pink shrimp delivered into Oregon ports in 2017. Close

• 19. [Article] Abundance and life history characteristics of steelhead (Oncorhynchus mykiss) and Coho Salmon (Oncorhynchus kisutch) smolts in two direct ocean tributaries on the central Oregon coast, Information Report 2018-07

  Abstract -- In 1991, the Oregon Department of Fish and Wildlife (ODFW) began an intensive research study at Tenmile Creek on the central Oregon coast to evaluate the effects of a large wood addition on ...

  Citation × Citation Citation Abstract Copy Title: Abundance and life history characteristics of steelhead (Oncorhynchus mykiss) and Coho Salmon (Oncorhynchus kisutch) smolts in two direct ocean tributaries on the central Oregon coast, Information Report 2018-07 Abstract -- In 1991, the Oregon Department of Fish and Wildlife (ODFW) began an intensive research study at Tenmile Creek on the central Oregon coast to evaluate the effects of a large wood addition on juvenile salmonid populations. Nearby Cummins Creek served as a reference site. Annual monitoring of juvenile salmonid out-migrants began in 1992 at the two sites, continued through 2012 at Cummins Creek, and is ongoing at Tenmile Creek. These data offer an unusually long time-series of smolt abundance and life history characteristics for steelhead and Coho Salmon at monitoring sites located less than a kilometer from the point of ocean entry. Annual estimates of steelhead smolt abundance ranged from 740 to 3,236 smolts at Cummins Creek, and from 2,464 to 19,602 smolts at Tenmile Creek. For Coho Salmon, annual estimates ranged from 319 to 3,164 smolts at Cummins Creek, and from 1,637 to 11,553 smolts at Tenmile Creek. Steelhead smolt production at Tenmile Creek appeared to increase significantly relative to Cummins Creek following the large wood addition in 1996, but there was no evidence of a similar effect on Coho Salmon smolt production. Most steelhead smolts spent 2 years rearing in freshwater before out-migration, and we observed a higher proportion of age-1 smolts and lower proportion of age-3 smolts than several other studies in Oregon coastal streams. Coho Salmon smolt out-migrants were dominated by age-1 individuals at both sites, but there was evidence that some juvenile Coho Salmon out-migrated as age-0 smolts. Smolts of both species tended to be larger at Tenmile Creek than at Cummins Creek, and negative relationships between mean smolt size and smolt abundance suggest that rearing density may influence growth for juvenile salmonids in these streams. The median migration date of steelhead smolts was consistent over time and tracked closely between the two sites. Coho Salmon smolt out-migration timing was more variable and tended to be slightly later than for steelhead, particularly at Tenmile Creek. During peak migration, a high proportion of steelhead migrants classified as smolts based on length had body coloration consistent with smoltification. External signs of smoltification were not as prevalent among steelhead captured early in the season, particularly among smaller migrants. This long term out-migrant monitoring at the ocean entrance illustrates the variation that occurs in freshwater production and the patterns that occur in salmonid smolt life history but also shows that without spawner abundance data conclusions about freshwater production are limited. Title: Abundance and life history characteristics of steelhead (Oncorhynchus mykiss) and Coho Salmon (Oncorhynchus kisutch) smolts in two direct ocean tributaries on the central Oregon coast, Information Report 2018-07 Abstract -- In 1991, the Oregon Department of Fish and Wildlife (ODFW) began an intensive research study at Tenmile Creek on the central Oregon coast to evaluate the effects of a large wood addition on juvenile salmonid populations. Nearby Cummins Creek served as a reference site. Annual monitoring of juvenile salmonid out-migrants began in 1992 at the two sites, continued through 2012 at Cummins Creek, and is ongoing at Tenmile Creek. These data offer an unusually long time-series of smolt abundance and life history characteristics for steelhead and Coho Salmon at monitoring sites located less than a kilometer from the point of ocean entry. Annual estimates of steelhead smolt abundance ranged from 740 to 3,236 smolts at Cummins Creek, and from 2,464 to 19,602 smolts at Tenmile Creek. For Coho Salmon, annual estimates ranged from 319 to 3,164 smolts at Cummins Creek, and from 1,637 to 11,553 smolts at Tenmile Creek. Steelhead smolt production at Tenmile Creek appeared to increase significantly relative to Cummins Creek following the large wood addition in 1996, but there was no evidence of a similar effect on Coho Salmon smolt production. Most steelhead smolts spent 2 years rearing in freshwater before out-migration, and we observed a higher proportion of age-1 smolts and lower proportion of age-3 smolts than several other studies in Oregon coastal streams. Coho Salmon smolt out-migrants were dominated by age-1 individuals at both sites, but there was evidence that some juvenile Coho Salmon out-migrated as age-0 smolts. Smolts of both species tended to be larger at Tenmile Creek than at Cummins Creek, and negative relationships between mean smolt size and smolt abundance suggest that rearing density may influence growth for juvenile salmonids in these streams. The median migration date of steelhead smolts was consistent over time and tracked closely between the two sites. Coho Salmon smolt out-migration timing was more variable and tended to be slightly later than for steelhead, particularly at Tenmile Creek. During peak migration, a high proportion of steelhead migrants classified as smolts based on length had body coloration consistent with smoltification. External signs of smoltification were not as prevalent among steelhead captured early in the season, particularly among smaller migrants. This long term out-migrant monitoring at the ocean entrance illustrates the variation that occurs in freshwater production and the patterns that occur in salmonid smolt life history but also shows that without spawner abundance data conclusions about freshwater production are limited. Close

• 20. [Article] Lower Snake River Compensation Plan; Oregon Spring Chinook Salmon Evaluation Studies - 2014 Annual Progress Report

  Abstract -- This annual progress report summarizes spring-summer Chinook Salmon monitoring data collected by ODFW for the Lower Snake River Compensation Plan (LSRCP) facilities in 2014. Also summarized ...

  Citation × Citation Citation Abstract Copy Title: Lower Snake River Compensation Plan; Oregon Spring Chinook Salmon Evaluation Studies - 2014 Annual Progress Report Abstract -- This annual progress report summarizes spring-summer Chinook Salmon monitoring data collected by ODFW for the Lower Snake River Compensation Plan (LSRCP) facilities in 2014. Also summarized are the associated broodstock monitoring data collected at weirs in the Grande Ronde Basin that are operated by our co-managers, the Nez Perce Tribe (NPT; Lostine River) and Confederated Tribes of the Umatilla Indian Reservation (CTUIR; Catherine Creek and Upper Grande Ronde River). The main objectives of this report are to document and evaluate spring-sumer Chinook Salmon culture performance for hatchery programs and achievement of management objectives in the Imnaha and Grande Ronde river basins (CTUIR and NPT have specific program goals for Chinook returns to Catherine Creek, the Upper Grande Ronde River, Lookingglass Creek, and the Lostine River that are discussed and evaluated in separate reports prepared by each co-management agency). Overall, these data are used to adaptively manage salmon culture practices in order to optimize egg-to-smolt survival rate, smolt quality, smolt-toadult survival rate, the recruits-per-spawner (R:S) ratio, and to monitor spawning in nature by hatchery-reared salmon. This report provides information on rearing and release operations for brood year (BY) 2012 of juvenile Chinook Salmon smolts, the collection of eggs for BY 2014, numbers and characteristics (e.g., age composition) of mature Chinook Salmon in the 2014 return year, the 2014 spawning year at Lookingglass Fish Hatchery and in nature, bacterial kidney disease (BKD) monitoring, and survival information (e.g., SAR, R:S) for BY 2009. These metrics document the success of these programs in meeting the LSRCP objectives for mature salmon returning to the mitigation area above Lower Granite Dam (LGD) and for harvest below LGD. In order to avoid confusion around whether jacks (age 3) are included with adult metrics, we will use the convention that “adults” include only ages 4 and 5 and “total” or “mature salmon” include all sexually mature salmon ages 3–5. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Title: Lower Snake River Compensation Plan; Oregon Spring Chinook Salmon Evaluation Studies - 2014 Annual Progress Report Abstract -- This annual progress report summarizes spring-summer Chinook Salmon monitoring data collected by ODFW for the Lower Snake River Compensation Plan (LSRCP) facilities in 2014. Also summarized are the associated broodstock monitoring data collected at weirs in the Grande Ronde Basin that are operated by our co-managers, the Nez Perce Tribe (NPT; Lostine River) and Confederated Tribes of the Umatilla Indian Reservation (CTUIR; Catherine Creek and Upper Grande Ronde River). The main objectives of this report are to document and evaluate spring-sumer Chinook Salmon culture performance for hatchery programs and achievement of management objectives in the Imnaha and Grande Ronde river basins (CTUIR and NPT have specific program goals for Chinook returns to Catherine Creek, the Upper Grande Ronde River, Lookingglass Creek, and the Lostine River that are discussed and evaluated in separate reports prepared by each co-management agency). Overall, these data are used to adaptively manage salmon culture practices in order to optimize egg-to-smolt survival rate, smolt quality, smolt-toadult survival rate, the recruits-per-spawner (R:S) ratio, and to monitor spawning in nature by hatchery-reared salmon. This report provides information on rearing and release operations for brood year (BY) 2012 of juvenile Chinook Salmon smolts, the collection of eggs for BY 2014, numbers and characteristics (e.g., age composition) of mature Chinook Salmon in the 2014 return year, the 2014 spawning year at Lookingglass Fish Hatchery and in nature, bacterial kidney disease (BKD) monitoring, and survival information (e.g., SAR, R:S) for BY 2009. These metrics document the success of these programs in meeting the LSRCP objectives for mature salmon returning to the mitigation area above Lower Granite Dam (LGD) and for harvest below LGD. In order to avoid confusion around whether jacks (age 3) are included with adult metrics, we will use the convention that “adults” include only ages 4 and 5 and “total” or “mature salmon” include all sexually mature salmon ages 3–5. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Close