Fishery bulletin of the Fish and Wildlife Service - NOAA

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SALMON RUNS OF THE COLUMBIA RIVEE IN 1938 127 Before adopting the policy of treating all of the data on the basis of time units of 1 week, the daily records were examined and it soon appeared that there was, especially in June and July 1938, a very definite weekly cycle of abundance as indicated by the catch in Zones 1 and 2. The Sunday closed season, of course, resulted in
128 FISHEEY BULLETIN OF THE FISH AND WILDLIFE SERVICE entire day; 6 pm. Saturday to 6 pm. Sunday. The effect of this accumulation was to increase the catch during the following day or two, but it wore off until, by the end of the week, little if any effect of the closed period remained. The character of the cycle obviously has been determined by the combined influence of a Sunday closed period and a very intensive fishery which, as shown above, takes approximately 80 percent of the fish entering the river during these 2 months. As an additional line of evidence of a dangerous intensity of fishing we have examined in some detail the daily catches and, for comparison, the daily count at Bonneville Dam for the months of June and July, with attention to the variations in catch and count within weeks; in other words, with respect to the variation that is associated with the day of the week on which the catch or the count was made. The data are presented in table 17, together with certain derived figures. From the figures of catch and count given we have calculated for each week day, excluding Sunday in dealing with catches, (1) the mean of the total deliveries for that day of the week during the 8 weeks under investigation, (2) the mean percentage of the total catch for the week, (3) the mean delivery per gill net, and (4) the mean percentage of the weekly total count at Bonneville. These values are presented in table 18. It is apparent that all three measures relating to the catch show much the same thing; namely, that there is a fairly constant and uniform decrease during the first half of the week, while the catch during the last half is relatively stable and at a much lower level. On the other hand, no such progression is apparent in the count at Bonneville. This is as one would expect in view of the fact that has just been demonstrated—that the intensive fishery takes out of the run during the first 3 days of the fishing week a very large part of the fish that have entered the river during the Sunday closed period. TABLE 17.—Daily catch of chinook salmon in Zones 1 and £, June 5 to July SO, 1938, and Bonneville count for corresponding runs, June 19 to August 13, with derived figures showing fluctuations in catch during the week JtipA Я Rn _ Date JUDO 7 Tu June 8 W June 9 Th -- . June 10 F jpne 11 Sfi Jim« 12 SN /une 13 M June 14 Tu June 15 W June 16 Th June 17 F June 18 Sa June 19 Su Jjinp 20 M June 21 Tu June 22 W Jilnfl 2Я Th June 24 P Juri** 25 Rn June 26 Su . Jiinn 27 M June 28 Tu June 29 W limn ЯП Til July 1 F _ - - - ... - - Total, all gear Pounds 605 17, 612 16,047 13, 499 15, 867 14,353 12, 139 19 462 20,542 23,412 19, 502 21, 767 24,681 368 40,894 39,249 32, 141 27,200 23,979 32,808 389 42,683 38,411 33,043 27,712 23.605 Total, gill nets only Poundt 605 17 612 16,047 13, 499 15, 867 14 353 12, 139 19 462 20 519 23,134 19, 025 20 804 21 915 368 35 627 35 039 26,481 21 596 19 678 23 850 37 596 34 601 31 638 25,871 21.462 Number of gill-net deliveries 7 288 291 244 240 246 236 335 336 358 324 318 337 4 416 429 374 332 308 366 421 419 391 354 328 ï The ladders were closed this day because of manipulation of the water levels, the count of the following day was divided equally between the two days, Mean catch per delivery 86 61 65 55 66 58 61 58 61 65 59 65 65 92 86 82 71 65 64 65 89 82 81 73 66 Percentage of weekly total 0 7 19 5 17 8 16 0 17.6 16 0 13 6 0.0 16 1 16 8 18 1 16.1 16 8 19 1 0.2 20 8 20.0 16.3 13 8 12.2 16.7 0.2 22.2 20.0 17.2 14.4 12.3 Bonneville count 260 283 318 422 283 446 218 191 191 167 159 243 159 130 231 243 128 113 133 36 i Q 149 79 l Q 618 471 261 Percentage of weekly total П.7 ]2 7 14 3 18 9 12.7 20 0 9 8 15 4 15 4 13 5 12 8 19 6 12 8 10 5 24 1 25 4 13 4 11 8 13 9 3 8 7 7 4 2 4 4 17 3 17 3 26 4 14.6 In calculating the percentage of the weekly total,
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UNITED STATES DEPARTMENT OF THE INT
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UNITED STATES DEPARTMENT OP THE INT
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ABSTRACT The results of an investig
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Fish and Wildlife Service, Fishery
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FLUCTUATIONS IN ABUNDANCE OF RED SA
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Cold Creek« Spring Creek Moraine C
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THE WHITEFISH FISHERY OF LAKES HURO
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PART II FLUCTUATIONS IN THE PRODUCT
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PART IV OBSERVATIONS ON THE FISHING
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