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Restigouche River System 1974 and 1975 Ages of Atlantic Salmon

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Restigouche River System 1974 and 1975 Ages of Atlantic Salmon Canada. Fisheries and Marine Service. Maritimes Region. Resource Development Branch. DATA RECORD SERIES MAR/D 1* Environment Canada Envitonnement Canada Fisheries Service des peches and Marine Service et des sciences de la mer Ages of Atlantic Salmon Collected From Sport Fisheries in the Restigouche River System . Ar 1974 and 1975 by J. L. Peppar, J. J. 0' Neill and P. R. Pickard Data Record Series No. MAR/ D-76-6 Freshwater and Anadromous Division Resource Branch Maritimes Region '06 AGES OF ATLANTIC SALMON COLLECTED FROM SPORT FISHERIES IN THE RESTIGOUCHE RIVER SYSTEM, 1974 AND 1975 J.L. PEPPAR, J.J. O'NEILL AND P.R. PICKARD JULY, 1976 DATA RECORD SERIES NO. MAR/D-76-6 FRESHWATER AND ANADROMOUS DIVISION RESOURCE BRANCH FISHERIES AND MARINE SERVICE DEPARTMENT OF THE ENVIRONMENT HALIFAX, NOVA SCOTIA iii CONTENTS INTRODUCTION 1 METHODS AND PRESENTATION OF DATA 2 ACKNOWLEDGEMENT 15 LIST OF TABLES TABLE 1. Percentage composition of sea ages of large salmon caught during successive semi-monthly periods on the Restigouche River system, 1974 3 TABLE 2. Percentage composition of freshwater (smolt) in each sea-age group of large salmon caught in the Restigouche River system, 1974 4 TABLE 3. Age composition (age structure) of large salmon of the Restigouche River system, 1974 5 TABLE 4. Age composition (total age in years) of large salmon of the Restigouche River system, 1974. 6 TABLE 5. Numbers of grilse samples taken over successive semi-monthly periods on the Restigouche River system, 19 74 7 TABLE 6. Percentage compOsition of freshwater (smolt) ages in grilse of the Restigouche River system, 1974 7 TABLE 7. Age composition (age structure and total age in years) of grilse of the Restigouche River system, 1974 8 TABLE 8. Percentage composition of sea ages of large salmon caught during successive semi- monthly periods on the Restigouche River system, 1975 9 TABLE 9. Percentage composition of freshwater (smolt) ages in each sea-age group of large salmon caught in the Restigouche River system, 1975 10 TABLE 10. Age composition (age structure) of large salmon of the Restigouche River system, 19 75 10 TABLE 11. Age composition (total age in years) of large salmon of the Restigouche River system, 19 75 11 iv TABLE 12. Numbers of grilse samples taken over successive semi-monthly periods on the Restigouche River system, 19 75 12 TABLE 13. Percentage composition of freshwater (smolt) ages in grilse of the Restigouche River system, 1975 12 TABLE 14. Age composition (age structure and total age in years) of grilse of the Restigouche River system, 1975 13 INTRODUCTION This report presents data on the ages of Atlantic salmon collected in 1974 and 1975 from sport fisheries of the Upsalquitch, Northwest Upsalquitch, Southeast Upsalquitch, Patapedia, Kedgwick and Little Main Restigouche rivers of the Restigouche River system, New Brunswick (Fig. 1). Patapedia Matapedia QUEBEC Dalhousie Ca mpbellton Restigouche Upsalquitch 0 15 Kilometers 11;'erZtt eSke SE Upsalquitch NW Upsalquitch Mop esce3 .„ Restigouche Co. Northumberland Co. Little Main Restigouche FIG. 1. Map of Restigouche River system, New Brunswick. Samples originated from a sampling program conducted by_the New Brunswick Fish and Wildlife Branch (Department of Natural Resources) throughout the sport fisheries of the Restigouche system during the 1974 and 1975 angling seasons (June 1-August 31). This sampling program is conducted each year by the Branch as part of their general census of sport fishery statistics of the Restigouche River system. Length, weight and sex are recorded, and scale samples are obtained from angled fish. At the close of the 1974 and 1975 angling seasons, scale samples were forwarded to the Resource Development Branch for subsequent examination. All ages were determined by scale reading. METHODS AND PRESENTATION OF DATA Each scale sample was examined under a binocular microscope and those scales with suitable (entire) centres were used for the 2 age determinations. To read the scales, a micro-projector was employed to project the scale image on a white background. Scale samples were independently read twice; additional readings were made of those samples in which the first two readings disagreed, and final ages were assigned on the basis of majority agreement. Differences in sample sizes recorded in the tables reflect the proportion of scales for which ages could not be determined; some scales did not provide suitable centres for determination of freshwater age. The method used to record data in this report divides total age into two parts — freshwater (smolt) and sea ages; for example, a fish recorded as "3.2" has spent three years in freshwater and all or part of the succeeding two years in the sea. This is commonly referred to as a "two-sea-winter" salmon. In presenting the age composition data, grilse (fish returning to spawn after spending only one winter at sea) and large salmon (fish returning to spawn after spending two or more winters at sea) are treated separately in the tables. Previously spawned fish are "lumped" in the large-salmon sea-age tables, regardless of at what age they spawned or how many times they had previously spawned. In the large-salmon freshwater-age (smolt) tables, the previously spawned fish have been separated according to their sea age when entering the river for the first time. Remaining tables present final age (i.e., present age) at year of sampling, irregardless of previous spawning. 3 TABLE 1. Percentage composition of sea ages of large salmon caught during successive semi-monthly periods on the Restigouche River system, 1974. Semi- No. of Maiden fish Previous monthly fish in Sea age-2 yr Sea age-3 yr Sea age-4 yr spawners period sample No. % No. % No. No. % Upsalctuitch River June 16-30 9 8 88.9 1 11.1 0 - 0 - July 1-15 38 37 97.4 1 2.6 0 - 0 - July 16-31 14 13 92.9 0 - 0 - 1 7.1 Aug. 1-15 4 4 100.0 0 - 0 - 0 Aug. 16-31 1 1 100.0 0 - 0 - 0 - Overall 66 63 95.5 2 3.0 0 - 1 1.5 Northwest Upealguitch River June 16-30 3 3 100.0 0 - 0 - 0 - July 1-15 6 6 100.0 0 - 0 - 0 - July 16-31 14 13 92.9 0 - 0 - 1 7.1 Aug. 1-15 3 3 100.0 0 - 0 - 0 Overall 26 25 96.2 0 - 0 - 1 3.9 Kedgwick River June 1-15 4 2 50.0 2 50.0 0 - 0 - June 16-30 59 11 18.6 44 74.6 1 1.7 3 5.1 July 1-15 54 35 64.8 19 35.2 0 - 0 - July 16-31 37 29 78.4 8 21.6 0 - 0 - Aug. 1-15 12 6 50.0 6 50.0 0 - 0 - Aug. 16-31 5 3 60.0 1 20.0 0 - 1 20.0 Overall 171 86 50.3 80 46.8 1 0.6 4 2.3 Little Main Restigouche River July 1-15 18 16 88.9 2 11.1 0 - 0 - July 16-31 15 13 86.7 1 6.7 0 - 1 6.7 Aug. 1-15 3 3 100.0 0 0 - 0 - Overall 36 32 88.9 3 8.3 0 - 1 2.8 Patapedia River June 16-30 7 4 57.1 2 28.6 0 - 1 14.3 July 1-15 15 12 80.0 3 20.0 0 - 0 - Overall 22 16 72.7 5 22.7 0 - 1 4.6 4 TABLE 2. Percentage composition of freshwater (smolt) ages in each sea-age group of large salmon caught in the Restigouche River system, 1974. No. of Smolt age Sea age fish in 2 yr 3 yr 4 yr (years) sample No. No. No. Upsalquitch River 2 64 52 81.3 11 17.2 1 1.6 3 2 2 100.0 0 0 Overall 66 54 81.8 11 16.7 1 1.5 Northwest Upsalquitch River 1 1 1 100.0 0 - 0 2 25 21 84.0 4 16.0 0 Overall 26 22 84.6 4 15.4 0 Kedgwick River 2 84 29 34.5 54 64.3 1 1.2 3 83 8 9.6 74 89.2 1 1.2 4 1 1 100.0 0 - 0 Overall 168 38 22.6 128 76.2 2 1.2 Little Main Restigouche River 1 1 0 - 1 100.0 0 2 32 18 56.3 14 43.8 0 3 3 0 3 100.0 0 Overall 36 18 50.0 18 50.0 0 Patapedia River 2 17 5 29.4 12 70.6 0 3 5 0 5 100.0 0 Overall 22 5 22.7 17 77.3 0 TABLE 3. Age composition (age structure) of large salmon of the Restigouche River system, 1974. Northwest Little Main Upsalquitch Upsaiguitch Kedgwick Restigouche Patapedia Age No. of % of No. of % of No. of % of No. of % of No. of % of structure fish sample fish sample fish sample fish sample fish sample 2.2 51 77.3 22 84.6 29 17.3 18 50.0 5 22.7 2.3 2 3.0 0 - 8 4.8 0 - 0 - 2.4 1 1.5 0 - 1 0.6 0 - 0 - 3.2 11 16.7 4 15.4 54 32.1 14 38.9 11 50.0 3.3 0 - 0 - 70 41.7 3 8.3 5 22.7 3.4 0 - 0 - 0 - 1 2.8 1 4.6 3.5 0 - 0 - 4 2.4 0 - 0 - 4.2 1 1.5 0 - 1 0.6 0 - 0 - 4.3 0 0 - 1 0.6 0 - 0 - Totals 66 100.0 26 100.0 168 100.0 36 100.0 22 100.0 01 0 TABLE 4.
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