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• 1. [Article] Relationship between spawning behavior of spear squids (Loligo bleekeri) and structures of the port

  Research Paper

  Citation × Citation Citation Abstract Copy Title: Relationship between spawning behavior of spear squids (Loligo bleekeri) and structures of the port Author: Yano, Kenji, Honma, Akihiro, Koganezaki, Kiyoto, Narumi, Hideto, Oka, Sadayuki, Kitahara, Shigeshi Research Paper Title: Relationship between spawning behavior of spear squids (Loligo bleekeri) and structures of the port Author: Yano, Kenji, Honma, Akihiro, Koganezaki, Kiyoto, Narumi, Hideto, Oka, Sadayuki, Kitahara, Shigeshi Research Paper Close

• 2. [Article] Use of ELISA to Monitor Bacterial Kidney Disease in Naturally Spawning Chinook Salmon

  Abstract -- Bacterial kidney disease (BKD) caused by Renibacterium salmoninarum (Rs) is a serious problem among Pacific Northwest salmon hatcheries and has raised concerns that salmon reared in hatcheries ...

  Citation × Citation Citation Abstract Copy Title: Use of ELISA to Monitor Bacterial Kidney Disease in Naturally Spawning Chinook Salmon Abstract -- Bacterial kidney disease (BKD) caused by Renibacterium salmoninarum (Rs) is a serious problem among Pacific Northwest salmon hatcheries and has raised concerns that salmon reared in hatcheries may spread BKD to natural populations. In order to monitor the potential spread of this disease to salmon spawning in nature, a method must be available to collect and analyze tissues from naturally spawning salmon. Kidney tissue analyzed by enzyme-linked immunosorbent assay (ELISA) is the standard method to detect the presence of Rs in salmon sampled in hatcheries. In this study, we tested the validity of using ELISA on kidney tissue collected from intact carcasses recovered on the spawning grounds to monitor BKD in naturally spawning populations by comparing ELISA optical density (OD) values from kidney tissue that was subjected to conditions that simulated decomposition in a carcass and collection during a spawning ground survey with samples freshly collected from salmon at a hatchery. Mean ELISA OD levels were 1.060 for the samples prepared by the normal preparation and 1.115 for samples prepared by simulating spawning ground survey collection. There was no significant difference in mean ELISA OD between the 2 sample preparations and the relationship did not significantly differ from 1:1 (slope = 0.946). This demonstrates that BKD prevalence in natural populations can be monitored using ELISA conducted on samples from intact carcasses recovered on spawning ground surveys. This will be an important tool for monitoring the effect of hatchery supplementation on naturally spawning salmon populations. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Title: Use of ELISA to Monitor Bacterial Kidney Disease in Naturally Spawning Chinook Salmon Abstract -- Bacterial kidney disease (BKD) caused by Renibacterium salmoninarum (Rs) is a serious problem among Pacific Northwest salmon hatcheries and has raised concerns that salmon reared in hatcheries may spread BKD to natural populations. In order to monitor the potential spread of this disease to salmon spawning in nature, a method must be available to collect and analyze tissues from naturally spawning salmon. Kidney tissue analyzed by enzyme-linked immunosorbent assay (ELISA) is the standard method to detect the presence of Rs in salmon sampled in hatcheries. In this study, we tested the validity of using ELISA on kidney tissue collected from intact carcasses recovered on the spawning grounds to monitor BKD in naturally spawning populations by comparing ELISA optical density (OD) values from kidney tissue that was subjected to conditions that simulated decomposition in a carcass and collection during a spawning ground survey with samples freshly collected from salmon at a hatchery. Mean ELISA OD levels were 1.060 for the samples prepared by the normal preparation and 1.115 for samples prepared by simulating spawning ground survey collection. There was no significant difference in mean ELISA OD between the 2 sample preparations and the relationship did not significantly differ from 1:1 (slope = 0.946). This demonstrates that BKD prevalence in natural populations can be monitored using ELISA conducted on samples from intact carcasses recovered on spawning ground surveys. This will be an important tool for monitoring the effect of hatchery supplementation on naturally spawning salmon populations. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Close

• 3. [Article] Use of ELISA to Monitor Bacterial Kidney Disease in Naturally Spawning Chinook Salmon - Information Reports 2006

  Abstract -- Bacterial kidney disease (BKD), caused by Renibacterium salmoninarum (Rs), is a serious problem among Pacific Northwest salmon hatcheries, including the concern that salmon reared in hatcheries ...

  Citation × Citation Citation Abstract Copy Title: Use of ELISA to Monitor Bacterial Kidney Disease in Naturally Spawning Chinook Salmon - Information Reports 2006 Abstract -- Bacterial kidney disease (BKD), caused by Renibacterium salmoninarum (Rs), is a serious problem among Pacific Northwest salmon hatcheries, including the concern that salmon reared in hatcheries may spread BKD to natural populations. In order to monitor the potential spread of this disease to salmon spawning in nature, a method must be available to collect and analyze tissues from naturally spawning salmon. Kidney tissue analyzed by enzyme-linked immunosorbent assay (ELISA) is the standard method to detect the presence of Rs in salmon sampled in hatcheries. We tested the ability to use ELISA on kidney tissue collected from intact carcasses recovered on the spawning grounds to monitor BKD in naturally spawning populations. We compared ELISA optical density (OD) values from kidney tissue that was subjected to simulated conditions to which kidney tissue would be exposed in a decomposing carcass and following collection during a spawning ground survey versus samples collected from freshly killed salmon at a hatchery. Mean ELISA OD levels were 1.060 for the samples prepared by the normal preparation and 1.115 for samples prepared by simulating spawning ground survey collection. We found no significant difference in mean ELISA optical density between the sample preparations and the relationship between them was nearly 1:1 (slope = 0.946). This demonstrates that BKD prevalence in natural populations can be monitored using ELISA conducted on samples from intact carcasses on spawning ground surveys. This will be an important tool for monitoring the effect of hatchery supplementation on naturally spawning salmon populations. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Title: Use of ELISA to Monitor Bacterial Kidney Disease in Naturally Spawning Chinook Salmon - Information Reports 2006 Abstract -- Bacterial kidney disease (BKD), caused by Renibacterium salmoninarum (Rs), is a serious problem among Pacific Northwest salmon hatcheries, including the concern that salmon reared in hatcheries may spread BKD to natural populations. In order to monitor the potential spread of this disease to salmon spawning in nature, a method must be available to collect and analyze tissues from naturally spawning salmon. Kidney tissue analyzed by enzyme-linked immunosorbent assay (ELISA) is the standard method to detect the presence of Rs in salmon sampled in hatcheries. We tested the ability to use ELISA on kidney tissue collected from intact carcasses recovered on the spawning grounds to monitor BKD in naturally spawning populations. We compared ELISA optical density (OD) values from kidney tissue that was subjected to simulated conditions to which kidney tissue would be exposed in a decomposing carcass and following collection during a spawning ground survey versus samples collected from freshly killed salmon at a hatchery. Mean ELISA OD levels were 1.060 for the samples prepared by the normal preparation and 1.115 for samples prepared by simulating spawning ground survey collection. We found no significant difference in mean ELISA optical density between the sample preparations and the relationship between them was nearly 1:1 (slope = 0.946). This demonstrates that BKD prevalence in natural populations can be monitored using ELISA conducted on samples from intact carcasses on spawning ground surveys. This will be an important tool for monitoring the effect of hatchery supplementation on naturally spawning salmon populations. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Close

• 4. [Article] Pine Creek and Catherine Creek Bull Trout Surveys - 2011

  Abstract -- Spawning ground index surveys for bull trout in the Pine Creek Basin (Baker County) and the Grande Ronde Basin (Catherine Creek)

  Citation × Citation Citation Abstract Copy Title: Pine Creek and Catherine Creek Bull Trout Surveys - 2011 Abstract -- Spawning ground index surveys for bull trout in the Pine Creek Basin (Baker County) and the Grande Ronde Basin (Catherine Creek) Title: Pine Creek and Catherine Creek Bull Trout Surveys - 2011 Abstract -- Spawning ground index surveys for bull trout in the Pine Creek Basin (Baker County) and the Grande Ronde Basin (Catherine Creek) Close

• 5. [Article] The 1951 Alsea River silver salmon tagging program

  During a tagging operation conducted in 1951 on the Alsea River, 1,142 adult silver salmon were tagged with plastic Petersen-type tags and stainless steel jaw tags. An attempt was made to determine whether ...

  Citation × Citation Citation Abstract Copy Title: The 1951 Alsea River silver salmon tagging program Author: Oregon. Fish Commission, Cleaver, Fred C. (Frederick Charles), 1916-, Morgan, Alfred R. During a tagging operation conducted in 1951 on the Alsea River, 1,142 adult silver salmon were tagged with plastic Petersen-type tags and stainless steel jaw tags. An attempt was made to determine whether tagged fish released in different apparent conditions suffered differential mortalities. Under the hypothesis that the recovery of the fish in the commercial fishery was independent of the apparent condition of the fish when it was released, a significant value of chi-square was obtained. However, it was concluded that this significance was a result of sampling differences and not actually due to differences in mortality. The number of fish taken in the commercial catch each week was calculated by dividing the number of pounds in the weekly catch by the average weight of the fish in the samples for that week. It was calculated that the commercial fishery took approximately 14,000 fish during the season, which was only about 15 per cent of the run available to the fishery. This is an extremely low fishing mortality and is considerably lower than had been expected. The number of tags taken each week by the commercial fishery was calculated by dividing the number of fish in the catch each week by the number of fish per tag in the samples for the week. It was calculated that 67 tags were taken during the season by the commercial fishery. This number of recoveries was 15.5 per cent of the 438 tags available to the fishery. With the cooperation of a number of boat moorages on the Alsea River, an estimate of the sport catch of silver salmon was made. It was calculated that the lower river sport fishery took approximately 3,000 adult silvers with an additional 500 fish being taken by the bank fishery. The weight of the total catch of 3,500 fish was calculated to be about 33,000 pounds. This weight formed 20.2 percent of the combined commercial and sport catches. It was calculated that 18 tagged fish were taken in the sport catch. A total of 44 numbered Petersen and jaw tags were recovered from both dead and live fish which had reached spawning areas. This number includes three tags recovered from the spawning grounds of adjacent streams. When the tagged fish were examined according to areas recovered, it was found that Drift Creek had a smaller number of fish per tag than any other area with one exception. Recoveries appeared to be distributed throughout the drainage from any particular time of tagging. Fish enter the lower river together, then separate to the various spawning areas in the system. Several fish moved from the tagging location in the Alsea River to adjacent streams. About 7 percent of the total recoveries in Table 12 were made from streams other than the Alsea River. The Petersen and jaw tag recoveries in the samples of the commercial catch were examined for selection of the Petersen tags by the nets. The percentage by size group in the catch of fish with each type of tag was about the same as the percentage by size group with each type of tag at the time of release. Large losses of tags in the fishery would have been reflected by a higher number of fish per tag on the spawning grounds. Since the gill-nets did not appear to be selective on either type of tag, the Petersen tags, jaw tags, and tag scars were combined in the calculations involving tag recoveries. After the fish moved beyond the fishing area, many still did not move rapidly to the spawning grounds. Several were taken in tidewater or in the vicinity of tidewater 48-58 days after they had been tagged. The average time between tagging and recovery on the spawning grounds was 63 days for live fish and 70 days for dead fish. Using the method proposed by Schaefer (1951a) for obtaining a population estimate from spawning ground recoveries, an estimate of the population available to the fishery was made from the number of tags recovered by sampling the commercial catch. It was calculated that approximately 90,000 fish were available to the fishery. About 89,000 fish were calculated to be available to the fishery when the equation N = nt/s was used, where N = the population, n = the sample size, t = the number of fish tagged, and s = the number of tag recoveries. The 95 percent limits of confidence for the population estimate derived from the equation N = nt/s were calculated using the method developed by Chapman (1948). The lower limit was found to be 63,736 fish, and the upper limit was 119,371 fish. Approximately 63,000 of the fish available to the commercial fishery continued the migration to the spawning grounds. Spawning ground tag recoveries provided an estimate of the population in the lower river which was in close agreement with the estimate of the population made from tag recoveries in the commercial fishery. Title: The 1951 Alsea River silver salmon tagging program Author: Oregon. Fish Commission, Cleaver, Fred C. (Frederick Charles), 1916-, Morgan, Alfred R. During a tagging operation conducted in 1951 on the Alsea River, 1,142 adult silver salmon were tagged with plastic Petersen-type tags and stainless steel jaw tags. An attempt was made to determine whether tagged fish released in different apparent conditions suffered differential mortalities. Under the hypothesis that the recovery of the fish in the commercial fishery was independent of the apparent condition of the fish when it was released, a significant value of chi-square was obtained. However, it was concluded that this significance was a result of sampling differences and not actually due to differences in mortality. The number of fish taken in the commercial catch each week was calculated by dividing the number of pounds in the weekly catch by the average weight of the fish in the samples for that week. It was calculated that the commercial fishery took approximately 14,000 fish during the season, which was only about 15 per cent of the run available to the fishery. This is an extremely low fishing mortality and is considerably lower than had been expected. The number of tags taken each week by the commercial fishery was calculated by dividing the number of fish in the catch each week by the number of fish per tag in the samples for the week. It was calculated that 67 tags were taken during the season by the commercial fishery. This number of recoveries was 15.5 per cent of the 438 tags available to the fishery. With the cooperation of a number of boat moorages on the Alsea River, an estimate of the sport catch of silver salmon was made. It was calculated that the lower river sport fishery took approximately 3,000 adult silvers with an additional 500 fish being taken by the bank fishery. The weight of the total catch of 3,500 fish was calculated to be about 33,000 pounds. This weight formed 20.2 percent of the combined commercial and sport catches. It was calculated that 18 tagged fish were taken in the sport catch. A total of 44 numbered Petersen and jaw tags were recovered from both dead and live fish which had reached spawning areas. This number includes three tags recovered from the spawning grounds of adjacent streams. When the tagged fish were examined according to areas recovered, it was found that Drift Creek had a smaller number of fish per tag than any other area with one exception. Recoveries appeared to be distributed throughout the drainage from any particular time of tagging. Fish enter the lower river together, then separate to the various spawning areas in the system. Several fish moved from the tagging location in the Alsea River to adjacent streams. About 7 percent of the total recoveries in Table 12 were made from streams other than the Alsea River. The Petersen and jaw tag recoveries in the samples of the commercial catch were examined for selection of the Petersen tags by the nets. The percentage by size group in the catch of fish with each type of tag was about the same as the percentage by size group with each type of tag at the time of release. Large losses of tags in the fishery would have been reflected by a higher number of fish per tag on the spawning grounds. Since the gill-nets did not appear to be selective on either type of tag, the Petersen tags, jaw tags, and tag scars were combined in the calculations involving tag recoveries. After the fish moved beyond the fishing area, many still did not move rapidly to the spawning grounds. Several were taken in tidewater or in the vicinity of tidewater 48-58 days after they had been tagged. The average time between tagging and recovery on the spawning grounds was 63 days for live fish and 70 days for dead fish. Using the method proposed by Schaefer (1951a) for obtaining a population estimate from spawning ground recoveries, an estimate of the population available to the fishery was made from the number of tags recovered by sampling the commercial catch. It was calculated that approximately 90,000 fish were available to the fishery. About 89,000 fish were calculated to be available to the fishery when the equation N = nt/s was used, where N = the population, n = the sample size, t = the number of fish tagged, and s = the number of tag recoveries. The 95 percent limits of confidence for the population estimate derived from the equation N = nt/s were calculated using the method developed by Chapman (1948). The lower limit was found to be 63,736 fish, and the upper limit was 119,371 fish. Approximately 63,000 of the fish available to the commercial fishery continued the migration to the spawning grounds. Spawning ground tag recoveries provided an estimate of the population in the lower river which was in close agreement with the estimate of the population made from tag recoveries in the commercial fishery. Close

• 6. [Article] Run Timing, Spawn Timing, and Spawning Distribution of Hatchery- and Natural-Origin Spring Chinook Salmon in the Imnaha River, Oregon

  Abstract -- We evaluated 16 years (1990-2005) of weir collection and spawning ground survey data to examine differences in run timing, spawn timing, and spawning distribution between naturally and hatchery-reared ...

  Citation × Citation Citation Abstract Copy Title: Run Timing, Spawn Timing, and Spawning Distribution of Hatchery- and Natural-Origin Spring Chinook Salmon in the Imnaha River, Oregon Abstract -- We evaluated 16 years (1990-2005) of weir collection and spawning ground survey data to examine differences in run timing, spawn timing, and spawning distribution between naturally and hatchery-reared Chinook salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon, and to look for changes in these variables over time. We compared run timing based on arrival time at the weir and found that naturally reared Chinook salmon arrived earlier than hatchery-reared fish in all 16 years. Carcasses of naturally reared fish of either or both sexes were recovered on the spawning grounds earlier than carcasses of hatchery-reared fish for all years combined and during 5 of 16 years, indicating earlier spawning by naturally reared fish. We compared spawning distribution using the percent of female carcasses recovered in each spawning ground survey reach. The percent recovery of the carcasses of naturally reared females was greater in reaches above the weir than below the weir and these carcasses were farther upstream than those of hatchery-reared females. For females of hatchery origin, carcasses were more commonly found in reaches closer to and below the weir (the smolt release location). Alternate management strategies designed to improve the maintenance of genetic integrity and life history characteristics of the Imnaha River Chinook salmon population should be considered, implemented, and evaluated. Collection strategies should be modified to ensure that the hatchery broodstock is representative of the entire natural run, and release strategies should be developed to promote a spawning distribution of hatchery adults that mimics the distribution of natural imnaha Chinook salmon. Eastern Oregon Fish Research (EOFR) Title: Run Timing, Spawn Timing, and Spawning Distribution of Hatchery- and Natural-Origin Spring Chinook Salmon in the Imnaha River, Oregon Abstract -- We evaluated 16 years (1990-2005) of weir collection and spawning ground survey data to examine differences in run timing, spawn timing, and spawning distribution between naturally and hatchery-reared Chinook salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon, and to look for changes in these variables over time. We compared run timing based on arrival time at the weir and found that naturally reared Chinook salmon arrived earlier than hatchery-reared fish in all 16 years. Carcasses of naturally reared fish of either or both sexes were recovered on the spawning grounds earlier than carcasses of hatchery-reared fish for all years combined and during 5 of 16 years, indicating earlier spawning by naturally reared fish. We compared spawning distribution using the percent of female carcasses recovered in each spawning ground survey reach. The percent recovery of the carcasses of naturally reared females was greater in reaches above the weir than below the weir and these carcasses were farther upstream than those of hatchery-reared females. For females of hatchery origin, carcasses were more commonly found in reaches closer to and below the weir (the smolt release location). Alternate management strategies designed to improve the maintenance of genetic integrity and life history characteristics of the Imnaha River Chinook salmon population should be considered, implemented, and evaluated. Collection strategies should be modified to ensure that the hatchery broodstock is representative of the entire natural run, and release strategies should be developed to promote a spawning distribution of hatchery adults that mimics the distribution of natural imnaha Chinook salmon. Eastern Oregon Fish Research (EOFR) Close

• 7. [Article] A Comparison of Run Timing, Spawn Timing and Spawning Distribution of Natural and Hatchery Spring Chinook Salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon - Information Reports 2005-03

  Abstract -- We compared fourteen years (1990-2003) of weir collection and spawning ground survey data to examine differences in run timing, spawning distribution and spawn timing between adult natural ...

  Citation × Citation Citation Abstract Copy Title: A Comparison of Run Timing, Spawn Timing and Spawning Distribution of Natural and Hatchery Spring Chinook Salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon - Information Reports 2005-03 Abstract -- We compared fourteen years (1990-2003) of weir collection and spawning ground survey data to examine differences in run timing, spawning distribution and spawn timing between adult natural and hatchery-reared Chinook salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon. We compared run timing using arrival time at the weir and found that natural salmon arrived earlier than hatchery salmon in 12 of 14 years. Natural carcasses, of either or both sexes, were recovered earlier than hatchery carcasses for all years combined and during 6 of 14 years, indicating earlier spawning by natural salmon. We compared spawning distribution using the percent of female carcasses recovered in each spawning ground survey reach. A greater percent of natural female carcasses were recovered in reaches above the weir and further upstream than carcasses of hatchery-reared females, which were more commonly found in reaches closer to and below the weir. Management strategies designed to maintain the genetic integrity and life history characteristics of the Imnaha River Chinook salmon should be considered, implemented and evaluated. Collected broodstock should mimic the wild run and spawn timing. Release strategies should be developed to promote a broader spatial spawning distribution of returning hatchery adults. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Title: A Comparison of Run Timing, Spawn Timing and Spawning Distribution of Natural and Hatchery Spring Chinook Salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon - Information Reports 2005-03 Abstract -- We compared fourteen years (1990-2003) of weir collection and spawning ground survey data to examine differences in run timing, spawning distribution and spawn timing between adult natural and hatchery-reared Chinook salmon Oncorhynchus tshawytscha in the Imnaha River, Oregon. We compared run timing using arrival time at the weir and found that natural salmon arrived earlier than hatchery salmon in 12 of 14 years. Natural carcasses, of either or both sexes, were recovered earlier than hatchery carcasses for all years combined and during 6 of 14 years, indicating earlier spawning by natural salmon. We compared spawning distribution using the percent of female carcasses recovered in each spawning ground survey reach. A greater percent of natural female carcasses were recovered in reaches above the weir and further upstream than carcasses of hatchery-reared females, which were more commonly found in reaches closer to and below the weir. Management strategies designed to maintain the genetic integrity and life history characteristics of the Imnaha River Chinook salmon should be considered, implemented and evaluated. Collected broodstock should mimic the wild run and spawn timing. Release strategies should be developed to promote a broader spatial spawning distribution of returning hatchery adults. Lower Snake River Compensation Plan (LSRCP) ODFW- Eastern Oregon Fish Research (EOFR) Close

• 8. [Article] Three-year Closure of Sailfin sandfish, Arctoscopus japonicus Fisheries and Resources Management in Akita Prefecture, Japan

  Research Paper

  Citation × Citation Citation Abstract Copy Title: Three-year Closure of Sailfin sandfish, Arctoscopus japonicus Fisheries and Resources Management in Akita Prefecture, Japan Author: Sugiyama, Hideki, Sakuramoto, Kazumi Research Paper Title: Three-year Closure of Sailfin sandfish, Arctoscopus japonicus Fisheries and Resources Management in Akita Prefecture, Japan Author: Sugiyama, Hideki, Sakuramoto, Kazumi Research Paper Close

• 9. [Article] Predation and food limitation as causes of mortality in larval herring at a spawning ground in British Columbia

  The published version of this article is copyrighted by Inter-Research and can be found here: http://www.int-res.com/journals/meps/meps-home/

  Citation × Citation Citation Abstract Copy Title: Predation and food limitation as causes of mortality in larval herring at a spawning ground in British Columbia Author: Purcell, Jennifer E., Grover, Jill J. The published version of this article is copyrighted by Inter-Research and can be found here: http://www.int-res.com/journals/meps/meps-home/ Title: Predation and food limitation as causes of mortality in larval herring at a spawning ground in British Columbia Author: Purcell, Jennifer E., Grover, Jill J. The published version of this article is copyrighted by Inter-Research and can be found here: http://www.int-res.com/journals/meps/meps-home/ Close

• 10. [Article] Using Calibrated Index Surveys to Estimate Chinook Spawner Escapement into the Salmon River, Oregon Information Report number 2012-01

  Abstract -- The Pacific Salmon Commission has designated the Salmon River hatchery stock of fall Chinook as an Exploitation Rate Indicator Stock (ERIS) for all 16 naturally produced stocks of fall Chinook ...

  Citation × Citation Citation Abstract Copy Title: Using Calibrated Index Surveys to Estimate Chinook Spawner Escapement into the Salmon River, Oregon Information Report number 2012-01 Abstract -- The Pacific Salmon Commission has designated the Salmon River hatchery stock of fall Chinook as an Exploitation Rate Indicator Stock (ERIS) for all 16 naturally produced stocks of fall Chinook on Oregon’s north coast. The Pacific Salmon Treaty (PST) specifies the necessity of these stocks to model the effects of mixed stock fisheries on wild Chinook salmon. The ocean migration patterns and catch rates of this stock are thought to closely resemble Oregon’s north migrating Chinook from coastal basins ranging from the Necanicum River in the north to the Siuslaw River in the south. A relatively long and continuous history of mark and recapture experiments with corresponding extensive spawning ground surveys and harvest estimates from a fresh water creel, serves as the foundation for a predictive model of spawner abundance. Peak counts from two spawning ground surveys were identified as an index that strongly correlates with relatively precise abundance estimates derived from a Peterson two event mark-recapture model. Index surveys are less labor intensive than previous mark-recapture activities, and evidence suggests they are an efficient and cost effective method to estimate spawner abundance. Title: Using Calibrated Index Surveys to Estimate Chinook Spawner Escapement into the Salmon River, Oregon Information Report number 2012-01 Abstract -- The Pacific Salmon Commission has designated the Salmon River hatchery stock of fall Chinook as an Exploitation Rate Indicator Stock (ERIS) for all 16 naturally produced stocks of fall Chinook on Oregon’s north coast. The Pacific Salmon Treaty (PST) specifies the necessity of these stocks to model the effects of mixed stock fisheries on wild Chinook salmon. The ocean migration patterns and catch rates of this stock are thought to closely resemble Oregon’s north migrating Chinook from coastal basins ranging from the Necanicum River in the north to the Siuslaw River in the south. A relatively long and continuous history of mark and recapture experiments with corresponding extensive spawning ground surveys and harvest estimates from a fresh water creel, serves as the foundation for a predictive model of spawner abundance. Peak counts from two spawning ground surveys were identified as an index that strongly correlates with relatively precise abundance estimates derived from a Peterson two event mark-recapture model. Index surveys are less labor intensive than previous mark-recapture activities, and evidence suggests they are an efficient and cost effective method to estimate spawner abundance. Close