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CORNWALL RIVER AUTHORITY SALMON SCALE READING INVESTIGATION 1972 St Johns. Launceston Cornwall

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CORNWALL RIVER AUTHORITY SALMON SCALE READING INVESTIGATION 1972 St Johns. Launceston Cornwall Salmon Scale Reading Investigation 1972 Item Type monograph Publisher Cornwall River Authority Download date 30/09/2021 22:54:03 Link to Item http://hdl.handle.net/1834/27169 CORNWALL RIVER AUTHORITY SALMON SCALE READING INVESTIGATION 1972 St Johns. Launceston Cornwall CORNWALL RIVER AUTHORITY SALMON SCALE READING INVESTIGATION - 1972 1 RIVER TAMAR 1.1 Scale Reading 1.1.1 Net Caught Salmon Prom a total reported oatch of 2,642 salmon, 845 sets of scales were received of which 58 sets were unreadable} all scales having replacement centres. The results of the scale reading are summarised in Table TABLE 1 Percentages in Each Age Group SEA LI BE RIVER ca LIFE C4 .1+ .2 . 24- a .3* .4 * « Total 1 1,7 1.8 1.4 0.4 0 0 0 5.3 CO 2 22.6 28.8 3 6.6 K\ 0.1 0.1 0.4 92.4 3 0 1.7 0.5 0 0 0 2.3 Total 24.3 32.3 38.5 4.3 0.1 0.1 0.4 1.1.2 Rod Caught Salmon From a total reported catch of 671 salmon, 180 sets of scales were received of which nine sets we re unreadable. The results of the scale reading are shown in Table 2. TABIE 2 Percentages in Each Age Group SEA LIFE RIVER LIFE . 1+ .2 . 2+ •3 •3+ .4 P.s. Total 1 2.9 1.8 2.3 3.5 0 0 0 10.5 2 27.5 29.8 23.4 8.2 0 0 0 88.9 3 0.6 0 0 0 0 0 0 0.6 Total 31.0 31.6 25.7, 11.7 0 0 0 Length and Weight Data The mean lengths and weights of each sea age group have been calculated for the nets and rods samples separately. The results are given in Tables 3 and 4. TABLE 3 Mean Lengths in Inches Age Nets Rods . 1+ 25.7 25.5 .2 28.7 29.4 .2+ 30.3 3 0 .8 * only one in sample 3 9 . 0* - .4 - P»S i 31*5 - TABIE 4 Mean Weights in Pounds Age Nets Rods . 1+ 6.5 6.2 .2 9*9 9.6 . 2+ 10.6 10.2 14.6 1 3 .2 * only one in sample • > 1 7 .5* - .4 2 3 .O* - P.S. 11.7 - Mean condition factors (K) have been calculated according to the formula 100 x W = T 3 where W is the mean weight in grams and L the mean length in centimetres. The results are shown in Table 5* 3 TABIE 5 Moan Condition Factors Age Nets Rods .1+ 1.06 1.04 .2 1.16 1.05 .2+ 1.05 0.97 • 3 0.99 1.00 •3+ 0.82 .4 - - P.S. 1.05 .. Length and weight frequency distribution histoprams have been plotted to show the size distribution of f'he various sea age groups (Figures 1-4). These show the considerable overlaps in size between the various age groups. Over 25$ of the nets catch of grilse weighed more than 7 l.b. 2 RIVER TAVY 2.1 Scale Reading 2.1.1 Net Caught Salmon From a to ta l reported catch of 549 salmon, 215 sets of scales were received, of which five sets were unreadable. The results of the scale re a. ding are summarised in Table 6. TABLE 6 Percentages in Each Age Group SEA LIES RIVER LIFE . 1+ .2 . 2+ • 3 • 3+ .4 P.S. Total 1 1.9 1.9 5*7 0 0.5 0 0 10.0 2 28.1 17.6 37 *6 1.9 0.5 0.5 0 86.2 3 1.9 1.0 1.0 0 0 0 0 3*9 Total 31.9 20.5 44.3. 1.9 1.0 0.5 0 4. 2.1.2 Rod Caught Salmon From a total reported catch of 134 salmon, 56 sets of scales were received, of which one was unreadable. The results of the scale reading are summarised in T a b l e 7 . TABLE 7 Percentages in Each Age Group SEA LIFE RIVER LIFE . 14- .2 • 2 + • 3 •3 + . 4 P . s . T o t a l 1 0 1 . 8 1 . 8 0 0 0 0 3 . 6 2 1 6 . 4 3 4 . 6 3 2 - 7 7 . 3 0 0 0 9 1 . 0 3 1 . 8 1 . 8 1 . 8 0 0 0 0 5 - 4 T o t a l 1 8 . 2 3 8 . 2 3 6 . 3 7 . 3 0 0 0 2.2 Length and Weight Data The mean lengths, weights and condition factors of each sea age group have been calculated for the nets and rods samples separately. The results are given in Tables 8, 9 a n d 1 0 . TABLBl 8 Mean Lengths in Inches A ge .N e ts R o d s .1 + 2 6 . 9 2 6 . 4 .2 2 9 . 9 2 9 . 4 *2+ 3 0 . 8 3 0 . 9 * only one in sample • 3 3 3 - 0 3 7 . 4 . 3"i~ 3 6 . 0* - . 4 3 5 * 0* - 5 TABIE 9 j Mean Weights in Pounds Age Nets Rods .1+ 7.4 6.6 .2 9.6 9.2 • 2+ 10.9 10.3 * only one in sample O 11.8 15.5 • 3+ 18. 0* .4 20.0* - TABIE 10 Mean Condition Factors Age Nets Rods • 1+ 1.05 0.99 .2 0.99 1.00 • 2-1- 1.03. O.96 * only one in sample •3 . 0.91 0.82 •3+ 1 . 07* ~ .4 1.29* - Length and weight frequency distribution histograms have been plotted to show the size distribution of the various sea age groups (Figures 5-8). A small number of unusually large grilse (up to 14 lb) was taken by the nets. Unfortunately the number of rod caught grilse scales obtained was insufficient for size analysis. 3 RIVER LYNHER 3.1 Scale Reading 3.1.1 Net Caught Salmon From a to ta l reported catch of 451 salmon, 105 sets of scales were received of which one set was unreadable. The results of the scale reading are summarised in Table x l . 6 TABIE .11 Percentages in Each Age Group SEA LI BE RIVER LIBS . 1+ .2 • 2+ •3 *3+ < 4 P.s. Total 1 1.0 0 2.9 0 0 0 0 3.9 2 2.5.0 16.4 49-0 1.9 0 0 2.9 95.2 3 0 0 1.0 0 0 0 0 1.0 T 0 bs x 26.0 16.4 52.9 1.9 0 0 2.9 1.2 Rod Caught Salmon Prom a total reported catch of 245 salmon, 84 sets of scales were received., of which two sets were unreadable . The results of the scale reading are summarised in Table 12. TABLE 12 Percentages In Each Age Group SEA RIVER LIFE KIBE .1+ . 2 « 2+ .3 .3+ .4 P.s. Total 1 0 0 1.2 0 1.2 0 0 2.4 2 17.1 39-0 34.1 4.9 1.2 0 0 96.3 3 0 1.2 0 0 0 0 0 1.2 Total 17.1 40.2 35.3 4.9 2.4 0 0 3.2 Length and Weight Data The mean lengths, weights and condition factors of each sea age group have been calculated for the nets and rods samples separately. The results are given in Tables 1J, 14 and 15* 7 TABLE 13 Mean Lengths in Inches Age Nets Rods . • 1+ 26.6 24.8 .2 30.3 29.2 * 2+ 31*3 30.0 * only one in sample O 34.G* 3^*5 . 3+ - 34.0 P .s . 30.5 - TABLE 14 Mean Weights in Pounds Age Nets Rods » i.-'r 6.6 5-9 .2 9*4 9.1 . 2+ 10.5 9-6 * only one in sample • 3 11.5* 15.0 • 3+ 13.8 P.s. 9*2 - ■ TABLE 15 Mean Condition Factors Age Nets Rods »1+ 0.97 0.90 .2 O.94 O.85 • 2+ 0.95 0.85 * only one in sample • 3 0.81* 0.82 •3+' _ 0.82 P. s. 0.89 8 Length and weight frequency distribution histograms have been plotted to show the size distribution of the various sea age groups (Figures 9-12)„ 4 RIVER FOWEY 4.1 Scale Reading 4.1.1 Net Caught Salmon From a total reported catch of 84 salmon, 27 sets of sca,Ies were received, a ll of which were readable. The results of the scale reading are summarised in' Table 16. TABIE 16 Percentages in Each Age Group SEA LIFE RIVER LIFE .1+ .2 .2+ -3 * 3+ .4 P.s. Total 1 0 0 3*7 0 0 0 0 3-7 2 3-7 33.3 44«4 7-4 0 0 0 88.8 3 0 3*7 0 0 3-7 0 0 7.4 Total _ 3-7 37*0 48.1 7 • 4 3-7 0 0 4.1.2 Rod Caught Salmon .From a to ta l reported catch of 219 salmon, 109 sets of scales we .re received, of which seven were unreadable. The results of the scale reading are summarised in Table 17. TABLE 17 Percentages in Each Age Group SEA LIFE RIVER LIFE . 1+ .2 «2+ *3 . > .4 P.s. Total 1 0 0 3*9 0 0 0 0 3‘ 9 2 41.2 17.7 33*3 2.0 1.0 0 0 95.2 iH 0 3 1.0 0 0 0 0 0 0 c ! Total 42»2 17.7 37-2 2.0 1.0 0 0 9 Many of the rod caught .1+ and .2+ fish had winter bands starting to form on the scale margins indicating that they had been feeding in the sea, into the late autumn and early winter.
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