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• 1. [Article] The salmon resources of the Willamette Basin

  This document describes the life history and abundance of both the spring Chinook salmon and the Silver salmon in the Willamette River. It also goes into detail about various factors affecting Willamette ...

  Citation × Citation Citation Abstract Copy Title: The salmon resources of the Willamette Basin Author: Oregon. Fish Commission This document describes the life history and abundance of both the spring Chinook salmon and the Silver salmon in the Willamette River. It also goes into detail about various factors affecting Willamette salmon runs., including pollution, dams, and logging. Title: The salmon resources of the Willamette Basin Author: Oregon. Fish Commission This document describes the life history and abundance of both the spring Chinook salmon and the Silver salmon in the Willamette River. It also goes into detail about various factors affecting Willamette salmon runs., including pollution, dams, and logging. Close

• 2. [Article] The future of the Columbia River salmon fisheries

  The salmon runs of the Columbia River constitute one of the most important natural resources of the states of Oregon and Washington. Thousands of people are dependent, wholly or in part, upon these resources ...

  Citation × Citation Citation Abstract Copy Title: The future of the Columbia River salmon fisheries Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 The salmon runs of the Columbia River constitute one of the most important natural resources of the states of Oregon and Washington. Thousands of people are dependent, wholly or in part, upon these resources for their livelihood; and their welfare is dependent upon the maintenance of the salmon runs. It is to the special interest of these people that the salmon supply be maintained at the level of maximum productivity and, indirectly, it is to the interest of all the citizens of these states that this be done. In recent years it has become increasingly evident that these resources, taken as. a whole, are decreasing in productivity and it has been frequently pointed out that this decrease is due primarily to the operation of two factors-- a very intensive fishery and a reduction in spawning and rearing areas due to the utilization of the water resources of the Columbia basin for other purposes. These influences, however, have affected the several species of salmon that are found in the Columbia River quite differently; the more valuable species, Chinooks and bluebacks, showing more evidence of depletion than do the other species, silver salmon, chums and steelhead. Title: The future of the Columbia River salmon fisheries Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 The salmon runs of the Columbia River constitute one of the most important natural resources of the states of Oregon and Washington. Thousands of people are dependent, wholly or in part, upon these resources for their livelihood; and their welfare is dependent upon the maintenance of the salmon runs. It is to the special interest of these people that the salmon supply be maintained at the level of maximum productivity and, indirectly, it is to the interest of all the citizens of these states that this be done. In recent years it has become increasingly evident that these resources, taken as. a whole, are decreasing in productivity and it has been frequently pointed out that this decrease is due primarily to the operation of two factors-- a very intensive fishery and a reduction in spawning and rearing areas due to the utilization of the water resources of the Columbia basin for other purposes. These influences, however, have affected the several species of salmon that are found in the Columbia River quite differently; the more valuable species, Chinooks and bluebacks, showing more evidence of depletion than do the other species, silver salmon, chums and steelhead. Close

• 3. [Article] Seasonal variations in weight of Columbia River chinook salmon

  A study of the fishery problems raised by the construction of the Grand Coulee Dam on the upper Columbia River was done. Part of the study was to estimate the number of salmon taken in commercial fishery ...

  Citation × Citation Citation Abstract Copy Title: Seasonal variations in weight of Columbia River chinook salmon Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 A study of the fishery problems raised by the construction of the Grand Coulee Dam on the upper Columbia River was done. Part of the study was to estimate the number of salmon taken in commercial fishery for the purpose of comparing this with the number counted as they passed the dam at Bonneville. Title: Seasonal variations in weight of Columbia River chinook salmon Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 A study of the fishery problems raised by the construction of the Grand Coulee Dam on the upper Columbia River was done. Part of the study was to estimate the number of salmon taken in commercial fishery for the purpose of comparing this with the number counted as they passed the dam at Bonneville. Close

• 4. [Article] The salmon runs of the Columbia River in 1938

  Exceptional data are available for the study of the salmon runs of the Columbia River in 1938. Detailed figures on catch were supplied by Oregon and Washington in such form that they could readily be combined ...

  Citation × Citation Citation Abstract Copy Title: The salmon runs of the Columbia River in 1938 Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 Exceptional data are available for the study of the salmon runs of the Columbia River in 1938. Detailed figures on catch were supplied by Oregon and Washington in such form that they could readily be combined with the counts at Bonneville Dam to provide a basis for estimating the escapement. Tables show the catch of each species for each week in each of six zones, and the counts at Bonneville and Rock Island dams. The general course of the run of each species is shown. The numbers of fish bound for the spawning grounds above Rock Island Dam are estimated as follows: Chinook salmon entering Columbia River before May 1, 4 percent; during May, 6 percent; June and July, 15 percent; and August to December, 1 percent. Blueback salmon entering the river during the above periods, 40 percent. Steelhead trout entering the river during June to September, 1 percent; during the rest of the year, 10 percent. Fishing intensities are shown by escapement to catch ratios. Percentages of chinook salmon escapement are less than 15 during May; 17 during June and July; and 33 during the remainder of the year. The June and July runs are now greatly depleted, and an important part of these runs spawns above Rock Island Dam. The blueback salmon escapement is about 20 percent, and of steelhead trout about 33 percent. Weekly and seasonal closed periods are shown to be almost entirely ineffective for increasing the spawning escapement. Exploitation is further increased by the intensive troll fishery conducted from Monterey Bay to southeastern Alaska. Chinook salmon are also subjected to a sport fishery of considerable importance. Main runs of salmon to the Columbia River are practically unprotected and are fished with destructive intensity. Title: The salmon runs of the Columbia River in 1938 Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 Exceptional data are available for the study of the salmon runs of the Columbia River in 1938. Detailed figures on catch were supplied by Oregon and Washington in such form that they could readily be combined with the counts at Bonneville Dam to provide a basis for estimating the escapement. Tables show the catch of each species for each week in each of six zones, and the counts at Bonneville and Rock Island dams. The general course of the run of each species is shown. The numbers of fish bound for the spawning grounds above Rock Island Dam are estimated as follows: Chinook salmon entering Columbia River before May 1, 4 percent; during May, 6 percent; June and July, 15 percent; and August to December, 1 percent. Blueback salmon entering the river during the above periods, 40 percent. Steelhead trout entering the river during June to September, 1 percent; during the rest of the year, 10 percent. Fishing intensities are shown by escapement to catch ratios. Percentages of chinook salmon escapement are less than 15 during May; 17 during June and July; and 33 during the remainder of the year. The June and July runs are now greatly depleted, and an important part of these runs spawns above Rock Island Dam. The blueback salmon escapement is about 20 percent, and of steelhead trout about 33 percent. Weekly and seasonal closed periods are shown to be almost entirely ineffective for increasing the spawning escapement. Exploitation is further increased by the intensive troll fishery conducted from Monterey Bay to southeastern Alaska. Chinook salmon are also subjected to a sport fishery of considerable importance. Main runs of salmon to the Columbia River are practically unprotected and are fished with destructive intensity. Close

• 5. [Article] Age, length and weight studies of three species of Columbia River salmon (Oncorhynchus keta, O. gorbuscha and O. kisutch)

  Samples, consisting of scales, length and weight measurements, and sex determinations of chum, pink, and silver salmons, were taken from the commercial catch in the Columbia River in 1914. Five hundred ...

  Citation × Citation Citation Abstract Copy Title: Age, length and weight studies of three species of Columbia River salmon (Oncorhynchus keta, O. gorbuscha and O. kisutch) Author: Marr, John C., Oregon. Fish Commission Samples, consisting of scales, length and weight measurements, and sex determinations of chum, pink, and silver salmons, were taken from the commercial catch in the Columbia River in 1914. Five hundred eighteen chum scales were examined. All fish had gone to sea early in their first year; and 70.5 percent had returned in their third year, 28.7 percent in their fourth, and 0.8 percent in their fifth. Growth curves, based on scale and fish measurements, are given for all sex-age groups. The length-weight relationship may be expressed by the equation Weight = 0.0001378 x Length [superscript 2.6004]. Tendencies were noted, during the course of the run, for older fish and for males to be relatively more abundant in the earlier portions of the run. In comparisons with data from other localities, it was demonstrated that, from south to north: (1) there is a decrease in mean length at the same age; (2) older fish are progressively more abundant; and (3) the runs are progressively earlier. Pink salmon are uncommon in the Columbia River, and only six were examined. All had gone to sea early in their first year, and all had returned in their second year. Eight hundred eighty-five silver salmon scales were examined. Of the total, 6.1 percent had gone to sea early in their second year, and returned late in their second year (2 [subscript 2]); 0.3 percent had gone to sea early in their third, and returned late in their third (3 [subscript 3]); 83.9 percent had gone to sea in their second, and returned in their third (3 [subscript 2]); and 9.7 percent had gone to sea in their third year, and returned during their fourth year (4 [subscript 3]). Growth curves are given for all, age groups. The length-weight relationship may be expressed by the equation Weight = 0.0000373 x Length [superscript 2.8945]. As in the case of the chums, changes were noted during the run in the sex ratio and the percentage of age classes. Comparison with data from other localities revealed south-to-north changes in size and in abundance of different age groups, similar to those demonstrated for the chums. It is felt that the differences between races of a single river system will prove to be of the same nature as those here demonstrated between populations of different river systems. Knowledge of the differences between the races of salmons entering the Columbia River may be of extreme importance in the management of the fisheries. Title: Age, length and weight studies of three species of Columbia River salmon (Oncorhynchus keta, O. gorbuscha and O. kisutch) Author: Marr, John C., Oregon. Fish Commission Samples, consisting of scales, length and weight measurements, and sex determinations of chum, pink, and silver salmons, were taken from the commercial catch in the Columbia River in 1914. Five hundred eighteen chum scales were examined. All fish had gone to sea early in their first year; and 70.5 percent had returned in their third year, 28.7 percent in their fourth, and 0.8 percent in their fifth. Growth curves, based on scale and fish measurements, are given for all sex-age groups. The length-weight relationship may be expressed by the equation Weight = 0.0001378 x Length [superscript 2.6004]. Tendencies were noted, during the course of the run, for older fish and for males to be relatively more abundant in the earlier portions of the run. In comparisons with data from other localities, it was demonstrated that, from south to north: (1) there is a decrease in mean length at the same age; (2) older fish are progressively more abundant; and (3) the runs are progressively earlier. Pink salmon are uncommon in the Columbia River, and only six were examined. All had gone to sea early in their first year, and all had returned in their second year. Eight hundred eighty-five silver salmon scales were examined. Of the total, 6.1 percent had gone to sea early in their second year, and returned late in their second year (2 [subscript 2]); 0.3 percent had gone to sea early in their third, and returned late in their third (3 [subscript 3]); 83.9 percent had gone to sea in their second, and returned in their third (3 [subscript 2]); and 9.7 percent had gone to sea in their third year, and returned during their fourth year (4 [subscript 3]). Growth curves are given for all, age groups. The length-weight relationship may be expressed by the equation Weight = 0.0000373 x Length [superscript 2.8945]. As in the case of the chums, changes were noted during the run in the sex ratio and the percentage of age classes. Comparison with data from other localities revealed south-to-north changes in size and in abundance of different age groups, similar to those demonstrated for the chums. It is felt that the differences between races of a single river system will prove to be of the same nature as those here demonstrated between populations of different river systems. Knowledge of the differences between the races of salmons entering the Columbia River may be of extreme importance in the management of the fisheries. Close

• 6. [Article] The effects on salmon populations of the partial elimination of fixed fishing gear on the Columbia River in 1935

  1. Six major types of commercial gear have been used to take salmon and steelhead on the Columbia River; namely, gill nets, set nets, seines, traps, fish wheels and dip nets. 2. The five important commercial ...

  Citation × Citation Citation Abstract Copy Title: The effects on salmon populations of the partial elimination of fixed fishing gear on the Columbia River in 1935 Author: Johnson, Donald R., Chapman, Wilbert McLeod, 1910-1970, Oregon. Fish Commission, Schoning, Robert W. 1. Six major types of commercial gear have been used to take salmon and steelhead on the Columbia River; namely, gill nets, set nets, seines, traps, fish wheels and dip nets. 2. The five important commercial species in the Columbia River are chinook, silver, blueback and chum salmon and steelhead trout. 3. In 1927 fish wheels were eliminated in Oregon. In 1935 fish wheels, traps, seines and set nets were eliminated in Washington. 4. The effect of the gear change in Washington in 1935 has been to increase the take in other gears, while the previous trend of total landings has not changed appreciably. 5. There is no conclusive evidence that the elimination of fixed gear in Washington increased the escapement of salmon and steelhead. 6. There is no conclusive evidence that any gear is injurious to the run except by subtracting fish from the run. 7. Measures designed to increase the escapement should apply to all gears and cover the entire life history of each species. Title: The effects on salmon populations of the partial elimination of fixed fishing gear on the Columbia River in 1935 Author: Johnson, Donald R., Chapman, Wilbert McLeod, 1910-1970, Oregon. Fish Commission, Schoning, Robert W. 1. Six major types of commercial gear have been used to take salmon and steelhead on the Columbia River; namely, gill nets, set nets, seines, traps, fish wheels and dip nets. 2. The five important commercial species in the Columbia River are chinook, silver, blueback and chum salmon and steelhead trout. 3. In 1927 fish wheels were eliminated in Oregon. In 1935 fish wheels, traps, seines and set nets were eliminated in Washington. 4. The effect of the gear change in Washington in 1935 has been to increase the take in other gears, while the previous trend of total landings has not changed appreciably. 5. There is no conclusive evidence that the elimination of fixed gear in Washington increased the escapement of salmon and steelhead. 6. There is no conclusive evidence that any gear is injurious to the run except by subtracting fish from the run. 7. Measures designed to increase the escapement should apply to all gears and cover the entire life history of each species. Close

• 7. [Article] The development and testing of techniques for studying the behavior of juvenile salmonids in reservoirs

  "The Oregon Fish Commission received a contract from the U. S. Fish and Wildlife Service, Bureau of Commercial Fisheries, under the Saltonstall-Kennedy Act for a study to develop methods for determining ...

  Citation × Citation Citation Abstract Copy Title: The development and testing of techniques for studying the behavior of juvenile salmonids in reservoirs Author: Gunsolus, Robert T., Korn, Lawrence, Oregon. Fish Commission "The Oregon Fish Commission received a contract from the U. S. Fish and Wildlife Service, Bureau of Commercial Fisheries, under the Saltonstall-Kennedy Act for a study to develop methods for determining the behavior of juvenile salmonids in reservoirs. The study, consisting of a literature survey and field program, was conducted in Felton and North Fork Reservoirs on the Deschutes and Clackamas Rivers, Oregon, between September 30, 1959 and January 31, 1962. Pelton Reservoir contains chinook salmon (Oncorhynchus tshawytscha), blueback salmon (0. nerka), and summer-run steelhead trout (Salmo airdneri); North Fork Reservoir contains chinook salmon, silver salmon (0. kisutch 1 and winter-run steelhead trout. Equipment tested included SCUBA (self-contained underwater breathing apparatus) for direct observation, gill nets for capture, and sonar for indirect observation of fish." (Abstract From Author) Title: The development and testing of techniques for studying the behavior of juvenile salmonids in reservoirs Author: Gunsolus, Robert T., Korn, Lawrence, Oregon. Fish Commission "The Oregon Fish Commission received a contract from the U. S. Fish and Wildlife Service, Bureau of Commercial Fisheries, under the Saltonstall-Kennedy Act for a study to develop methods for determining the behavior of juvenile salmonids in reservoirs. The study, consisting of a literature survey and field program, was conducted in Felton and North Fork Reservoirs on the Deschutes and Clackamas Rivers, Oregon, between September 30, 1959 and January 31, 1962. Pelton Reservoir contains chinook salmon (Oncorhynchus tshawytscha), blueback salmon (0. nerka), and summer-run steelhead trout (Salmo airdneri); North Fork Reservoir contains chinook salmon, silver salmon (0. kisutch 1 and winter-run steelhead trout. Equipment tested included SCUBA (self-contained underwater breathing apparatus) for direct observation, gill nets for capture, and sonar for indirect observation of fish." (Abstract From Author) Close

• 8. [Article] Some factors influencing the trends of salmon populations in Oregon

  Three factors were found to be significantly correlated with the fluctuations and trends in silver salmon production in Oregon. Logging was found to adversely affect the runs of salmon in later years. ...

  Citation × Citation Citation Abstract Copy Title: Some factors influencing the trends of salmon populations in Oregon Author: Johnson, Donald R., Oregon. Fish Commission, Hodges, John I., McKernan, Donald L. (Donald Lynn), 1918-1979 Three factors were found to be significantly correlated with the fluctuations and trends in silver salmon production in Oregon. Logging was found to adversely affect the runs of salmon in later years. Exceptional winter floods seem to produce poor resulting runs. Low summer water flows also appear to produce lower than average runs on some rivers, while higher summer flows appear to be followed by an increase in the resultant runs. The intensity of fishing was also found to affect the subsequent productivity of the fisheries. Increases in fishing effort on the rivers studied were followed in succeeding cycles by a lower catch, and when the fishing effort declined the ensuing production of silver salmon generally increased. Other factors studied did not bear a significant relationship to the fluctuations or trends of productivity of silver salmon. Title: Some factors influencing the trends of salmon populations in Oregon Author: Johnson, Donald R., Oregon. Fish Commission, Hodges, John I., McKernan, Donald L. (Donald Lynn), 1918-1979 Three factors were found to be significantly correlated with the fluctuations and trends in silver salmon production in Oregon. Logging was found to adversely affect the runs of salmon in later years. Exceptional winter floods seem to produce poor resulting runs. Low summer water flows also appear to produce lower than average runs on some rivers, while higher summer flows appear to be followed by an increase in the resultant runs. The intensity of fishing was also found to affect the subsequent productivity of the fisheries. Increases in fishing effort on the rivers studied were followed in succeeding cycles by a lower catch, and when the fishing effort declined the ensuing production of silver salmon generally increased. Other factors studied did not bear a significant relationship to the fluctuations or trends of productivity of silver salmon. Close

• 9. [Article] An application of the control chart method to the analysis of fisheries data

  In a paper now in press as a Bulletin of the U. S. Fish and Wildlife Services the writer has discussed the downward trend of the catch of Columbia River Chinook salmon since 1920 and has stated that the ...

  Citation × Citation Citation Abstract Copy Title: An application of the control chart method to the analysis of fisheries data Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 In a paper now in press as a Bulletin of the U. S. Fish and Wildlife Services the writer has discussed the downward trend of the catch of Columbia River Chinook salmon since 1920 and has stated that the decline is doubtless an indication that the runs of this species are seriously depleted. Recently the same data have been studied by means of the control chart method and the results show so clearly that the productivity has dropped to a new and much lower level that it has seemed worth while to present a brief note amplifying the discussion in the bulletin. Title: An application of the control chart method to the analysis of fisheries data Author: Oregon. Fish Commission, Rich, Willis H. (Willis Horton), 1885-1972 In a paper now in press as a Bulletin of the U. S. Fish and Wildlife Services the writer has discussed the downward trend of the catch of Columbia River Chinook salmon since 1920 and has stated that the decline is doubtless an indication that the runs of this species are seriously depleted. Recently the same data have been studied by means of the control chart method and the results show so clearly that the productivity has dropped to a new and much lower level that it has seemed worth while to present a brief note amplifying the discussion in the bulletin. Close

• 10. [Article] The ocean salmon troll fishery of Oregon

  1. The Oregon troll salmon fishery developed rapidly prior to World War I to reach a peak of between one and three thousand boats fishing off the mouth of the Columbia River during 1919. The fishery later ...

  Citation × Citation Citation Abstract Copy Title: The ocean salmon troll fishery of Oregon Author: Oregon. Fish Commission, Van Hyning, Jack M. 1. The Oregon troll salmon fishery developed rapidly prior to World War I to reach a peak of between one and three thousand boats fishing off the mouth of the Columbia River during 1919. The fishery later expanded to the other coastal areas. There has been a decrease in the number of boats fishing, but a great increase in their efficiency. The development of the tuna fishery resulted in the larger trollers fishing for tuna during the late summer and concentrating on salmon during the spring and early summer. There are about 500 trollers which make Oregon ports their base of operations at the present time. Since 1940 the Oregon troll fishery has landed about 3,000,000 pounds of chinook and silver salmon per year. The troll fishery was practically unregulated until 1948, at which time, preliminary regulations were imposed. 2. Preliminary troll regulations which were imposed since 1948 and altered somewhat in 1949 include a 26 inch minimum size limit and a closed season from November 1 to March 15 on chinook salmon. A closed season for silver salmon extends from November 1 to June 15 to prevent the landing of small silvers during the late spring. 3. This report covers in part the tagging and biological data gathered by the staff of the Oregon Fish Commission during 1946, 1947, 1948 and 1949. 4. There were 506 silvers tagged off Oregon in 1948 and 1949, and 29 (5.7 percent) were recovered. By far the greater percentage were recovered north of their tagging location, indicating a northward migration of silvers in their third and last year to their spawning streams. 5. The recovery of marked silver salmon in the ocean, confirms the findings of the tagging in that early in the season (June) the marked fish were found south of their home streams, and as the season advanced they moved north until during September they were grouped around the mouths of the rivers. 6. The length-weight relationship of troll-caught silver salmon was found to be an exponential type of relationship, and the equation for 1947 is W = 0.23215 x 1.0535 [superscript L]; that for 1948 is W = 0.27952 x 1.04949 [superscript L]. 7. The commercial catch of silver salmon is composed largely of individuals in their third year. There seems to be a considerable difference between the growth rates of different years, but the silvers show an average increase in mean weight from about 4.5 pounds on June first to about eight pounds by November first, dressed weight. They showed an increase in modal length in 1948 from 25.2 inches (total length) in June to 30.4 inches (total length) in November. 8. There were 221 chinook salmon tagged in 1948 and 1949 and eleven recoveries were made. No consistent migration pattern is apparent, but it is apparent that the chinook move both north and south of their natal streams and probably migrate farther than do the silver salmon. 9. The length-weight relationship of the chinook salmon was found to conform to the usual parabolic relationship, W = AL [superscript b]. The equation for 1947 was W = 0.000013126 [superscript L 3.17008] and for 1948, W = 0.000009256 [superscript L 3.24142]. 10. The age and growth of the troll caught chinook salmon was studied. The 2+ group was the dominant year class in the catch of 1919, 1946, and probably 1948, but in 1947 there was slightly more of the 3+ group. The 3+ group was next in abundance in 1919 and 1946, with the 1+ group age class comprising a relatively small part of the catch. There is a considerable variation in the sizes and ages of chinooks found in the different areas at different times, and also between years. 11. During April and May, trolling is concentrated off the mouth of the Columbia River. Usually there is a slight peaking in average weight in the spring, followed by a decline and a subsequent rise to a peak in August. In all cases average weight dropped appreciably after August. 12. The ocean sport fishery operates mainly out of Depoe Bay and Newport, with smaller fleets out of nearly every port on the Oregon Coast. The estimated ocean sport catch in 1949 was 700 chinooks (9,000 pounds) and 9,000 silvers (70,000 pounds). Title: The ocean salmon troll fishery of Oregon Author: Oregon. Fish Commission, Van Hyning, Jack M. 1. The Oregon troll salmon fishery developed rapidly prior to World War I to reach a peak of between one and three thousand boats fishing off the mouth of the Columbia River during 1919. The fishery later expanded to the other coastal areas. There has been a decrease in the number of boats fishing, but a great increase in their efficiency. The development of the tuna fishery resulted in the larger trollers fishing for tuna during the late summer and concentrating on salmon during the spring and early summer. There are about 500 trollers which make Oregon ports their base of operations at the present time. Since 1940 the Oregon troll fishery has landed about 3,000,000 pounds of chinook and silver salmon per year. The troll fishery was practically unregulated until 1948, at which time, preliminary regulations were imposed. 2. Preliminary troll regulations which were imposed since 1948 and altered somewhat in 1949 include a 26 inch minimum size limit and a closed season from November 1 to March 15 on chinook salmon. A closed season for silver salmon extends from November 1 to June 15 to prevent the landing of small silvers during the late spring. 3. This report covers in part the tagging and biological data gathered by the staff of the Oregon Fish Commission during 1946, 1947, 1948 and 1949. 4. There were 506 silvers tagged off Oregon in 1948 and 1949, and 29 (5.7 percent) were recovered. By far the greater percentage were recovered north of their tagging location, indicating a northward migration of silvers in their third and last year to their spawning streams. 5. The recovery of marked silver salmon in the ocean, confirms the findings of the tagging in that early in the season (June) the marked fish were found south of their home streams, and as the season advanced they moved north until during September they were grouped around the mouths of the rivers. 6. The length-weight relationship of troll-caught silver salmon was found to be an exponential type of relationship, and the equation for 1947 is W = 0.23215 x 1.0535 [superscript L]; that for 1948 is W = 0.27952 x 1.04949 [superscript L]. 7. The commercial catch of silver salmon is composed largely of individuals in their third year. There seems to be a considerable difference between the growth rates of different years, but the silvers show an average increase in mean weight from about 4.5 pounds on June first to about eight pounds by November first, dressed weight. They showed an increase in modal length in 1948 from 25.2 inches (total length) in June to 30.4 inches (total length) in November. 8. There were 221 chinook salmon tagged in 1948 and 1949 and eleven recoveries were made. No consistent migration pattern is apparent, but it is apparent that the chinook move both north and south of their natal streams and probably migrate farther than do the silver salmon. 9. The length-weight relationship of the chinook salmon was found to conform to the usual parabolic relationship, W = AL [superscript b]. The equation for 1947 was W = 0.000013126 [superscript L 3.17008] and for 1948, W = 0.000009256 [superscript L 3.24142]. 10. The age and growth of the troll caught chinook salmon was studied. The 2+ group was the dominant year class in the catch of 1919, 1946, and probably 1948, but in 1947 there was slightly more of the 3+ group. The 3+ group was next in abundance in 1919 and 1946, with the 1+ group age class comprising a relatively small part of the catch. There is a considerable variation in the sizes and ages of chinooks found in the different areas at different times, and also between years. 11. During April and May, trolling is concentrated off the mouth of the Columbia River. Usually there is a slight peaking in average weight in the spring, followed by a decline and a subsequent rise to a peak in August. In all cases average weight dropped appreciably after August. 12. The ocean sport fishery operates mainly out of Depoe Bay and Newport, with smaller fleets out of nearly every port on the Oregon Coast. The estimated ocean sport catch in 1949 was 700 chinooks (9,000 pounds) and 9,000 silvers (70,000 pounds). Close