INSTITUTE FUR~~h~ E2A0 212 iUpLm A:-x 88-8 Ann Arbor, P01 48109 FISHERIES DIVISION TECHNICAL REPORT Medusa Creek Harvest Wemir Report, 1987 r 9 qlzz) I I I I U I Mi~chigan Department of Natural Resources 'K MICHIGAN DEPARTMENT OF NATURAL RESOURCES FISHERIES DIVISION Fisheries Technical Report No. 88-8 August 8, 1988 MEDUSA CREEK HARVEST WEIR REPORT, 1987 Janice L. Fenske 2 INTRODUCTION Chinook salmon were stocked in the northern end of Lake Michigan (Antrim, Charlevoix, and Emmet counties) in the early phase of the salmon program, 1970 to 1976; however, no more chinook were added until 1983, when the Jordan River (Antrim County) was planted. It was subsequently decided that large numbers of Pacific salmon were undesirable in this river and the planting location was moved to Medusa Creek (Charlevoix County) beginning in 1984. An average of 337,526 spring fingerling chinook have been planted annually in Medusa Creek for the past 4 years (Table 1). Medusa Creek is a small, man-made stream that is a tributary to northern Lake Michigan in Charlevoix County. It's flow is due to the operation of one to three pumps used to drain the limestone quarries of the Medusa Cement Company. This stream was chosen because (1) it was located in a good area for a salmon lake fishery and (2) because large numbers of returning surplus salmon could be controlled due to its small size and private ownership. All of the salmon that run Medusa Creek in the fall are harvested by and sold to a private contractor. An agreement exists between the private contractor and Medusa Cement Company for the use of the harvest site. The location of the salmon blocking weir and harvest operation is approximately 150 feet upstream of the creek mouth. The harvest site was constructed in the fall of 1986 by a private contractor. A permanent harvest pond was dug adjacent to the creek, with an inlet at the upstream end to divert a portion of the creek flow through the pond and a fish ladder at the downstream end to allow passage of salmon into the pond (Figure 1). During fall harvest operations, a temporary wood rack weir is installed in the creek to prevent the salmon from migrating further upstream and to force them into the harvest pond. Salmon harvest operations on Medusa Creek began in 1986. Few salmon returned in 1986, as would be expected since stocking at this location only began in 1984. An estimated 1,500 chinook salmon weighing 14,676 pounds were harvested during the period October 3 to November 7, 1986 (M. Shouder, unpublished data, Michigan Department of Natural Resources, Newberry). HARVEST WEIR OPERATIONS, 1987 The harvest pond was filled and the blocking weir was installed during the second week of September. The harvest operation was completed on November 10, resulting in a total harvest season of 62 days. The salmon were harvested by Tempotech Industries personnel and all salmon were sold to this contractor. Fisheries Division personnel were on-site during harvest operations to monitor the harvest and collect biological data. 3 The first major run of chinook salmon occurred during the third week of 'September and the first harvest took place on September 21. The last date of harvest was November 10, for a total of 50 -days of harvest operations. There were two peaks in the number of salmon harvested. The first and largest peak occurred during the week of September 28 and the second, somewhat small peak, occurred during the week of October 12 (Table 2). The total number of chinook salmon harvested was estimated at 11,230 with an estimated round weight of 131,132 pounds (Table 3). Biological samples were taken during weeks 1, 2, 3, and 7 of the harvest operation. Each sample was randomly selected and consisted of 150 to 300 chinook. Data collected included length, weight, sex, number of lamprey scars, and fin clips. No scale samples were taken for age analysis because the reabsorption of scales on spawning chinook makes analysis from such scales inaccurate. Ages were assigned to the chinook sample based on a length -age key (Table 4). This table was derived from data collected during a sport fishery creel census at several sites on Lake Michigan from September through November 1987. (Insufficient creel census data were collected in 1987 from sites in Antrim, Charlevoix, and Emmet counties for use in assigning ages.) When assigning ages to fish in the biological samples from the weir there were some cases when inch groups represented by more than one age resulted in fractions of a fish. When this occurred, the fractions were assigned to,'an age group based on weight. The chinook harvest was composed of fish from ages 0.1 to 0.5, with 13.0% age 0.1, 9.5% age 0.2, 37.3% age 0.3, 37.4% age 0.4, and 2.8% age 0.5 (Table 5). Based on the four biological samples, the run was composed of 24.6% females and 75.4% males (Table 5). Mean lengths and weights for the sexes combined were as follows: age 0.1, 22.7 inches and 4.2 pounds; age 0.2, 27.0 inches and 6.7 pounds; age 0.3, 33.5 inches and 11.7 pounds; age 0.4, 36.0 inches and 15.0 pounds; and age 0.5, 38.0 inches and 18.6 pounds (Table 6, Figure 2). Chinook salmon have only been stocked in Medusa Creek since 1984, so no total return rate can be derived for any year class. Comparison of the percent of a year class returning to the Medusa Creek weir at each age to similar data for the Little Manistee River weir (Hay 1988) indicate that total year class return rates for chinook stocked in Medusa Creek may be low. The percent return for age -0.1 fish at the Little Manistee River weir has ranged from 0.4% to 1.9% (4 years). The percent of the 1986 plant returning to the Medusa Creek weir in 1987 was 0.5% (Table 7), which falls within the range reported at the Little Manistee weir. HoeeAge %-0 A__A.2X!1_-And-ae-03!fsh eturingto eduar Creek_ I-!I^n 197Iwrenly0.% And 0.8^ % i 4 straying from the Medusa plants. This was already recognized as a potential problem after the 1986 harvest season and, in 1987, the spring fingerlings planted in Medusa Creek were held in the harvest pond for about 2 weeks in an attempt to better imprint the fish to this stream. No fish were stocked in Medusa Creek in 1983, but chinook were stocked in the Jordan River that year (Table 1) and it is believed that the age-0.4 fish harvested at the Medusa weir in 1987 represent straying from this plant. The percent of the 1983 plant in the Jordan River returning to the Medusa weir in 1987 as age-0.4 fish was 1.3%, which is very similar to the range of 1.1% to 1.2% reported for the Little Manistee weir. There was also a large run of chinook in the Jordan River in 1987 and, although these fish were not sampled, some of them would have been age 0.4 which suggests very good survival of the 1983 plant. There were also some age-0.5 chinook taken at the Medusa Creek weir in 1987. Since no chinook were stocked in any nearby streams in 1982, these fish were either assigned to the wrong age group, were produced naturally in nearby streams, or strayed from plants at more distant streams. Lamprey scarring rates were very low for the chinook salmon. Only 0.5% of the fish sampled had fresh lamprey scars and 0.9% had healed lamprey scars. Two fin-clipped chinook were sampled. These fish were both age-0.2 females. One was 26.5 inches and 6.0 pounds with a right ventral (RV) clip, and the second was 29.0 inches and 7.0 pounds with a right pectoral (RP) clip. The origin of these fish could not be positively determined, but the RP clip did match chinook planted in 1985 at Chicago, Illinois. No species of fish other than chinook salmon entered Medusa Creek during harvest operationS, however, one dead pink salmon was found on the beach at the mouth of the creek. SUMMARY Harvest operations took place at the Medusa Creek weir in 1987 from September 21 to November 10, a total of 50 days. An estimated 11,230 chinook salmon weighing 131,132 pounds were harvested during this period. The run consisted of 24.6% females and 75.4% males. The age composition of the run was 13.0% age 0.1 (0.5% of the 1986 plant), 9.5% age 0.2 (0.4% of the 1985 plant), 37.3% age 0.3 (0.8% of the 1984 plant); 37.4% age 0.4, and 2.8% age 0.5. Mean lengths and weights for the combined sexes were 22.7 inches and 4.2 pounds for age 0.1, 27.0 inches and 6.7 pounds for age 0.2, 33.5 inches and 11.7 pounds for age 0.3, 36.0 inches and 15.0 pounds for age 0.4, and 38.0 inches and 18.6 pounds for age 0.5. 5 RECOMMENDATIONS FOR 1988 It is recommended that the practice of holding the spring fingerlings in the harvest pond for a few weeks to better imprint the salmon be continued in order to attain better return rates. In addition, biological samples should be collected on a weekly basis during the entire harvest season. Finally, stream banks upstream of the harvest operation should be stabilized to retard the accumulation of sediment in the bottom of the harvest pond, the presence of which makes operation of the crowding gate difficult. ACKNOWLEDGMENTS Data collection and tabulation were done by Harold Miller, Lyle Hollenbaugh, Jim Holser, and Brian Hoxie. Scale reading for age analysis was done by Alfred Allen, Steve Lazar, Janice Sapak, Simeon Syrewicze, and Peter Makoweski. Technical advice was given by Ralph Hay, Mason Shouder, Kelley Smith, and Steve Swan. Kelley Smith edited the report. 6 N I Lake Michigan Weir, Ladder Inlet Medusa Creek Figure 1. Location and schematic diagram of the Medusa Creek weir complex. 7 40 () Q) C 0 35 - I-. 30 -c') C 25 -0) (D 20 -20,g-. 15 3 0)," O 10..c - - -0 r) a) 5 - ~ 0 0.1 0.2 0.3 0.4 0.5 Age Figure 2. Mean total length (inches) and round weight (pounds), by age, of chinook salmon harvested at the Medusa Creek weir, fall 1987. Vertical bars represent two standard errors. 8 Table 1. Number of spring fingerling chinook salmon planted in Medusa Creek, Charlevoix County, 1984-87. Planting Number year planted 1984 500,108 1985 243,820 1986 299,975 1987 306,200 Total 1,350,103 Table 2. Number, by week, of chinook salmon harvested at the Medusa Creek weir, fall 1987. Week Number Week beginning harvested 1 09/21 950 2 09/28 4,336 3 10/05 978 4 10/12 2,958 5 10/19 696 6 10/26 555 7 11/02 609 8 11/09 148 Total 11,230 Table 3. Number, by age, of chinook salmon harvested at the Medusa Creek weir, fall 1987. Weight (pounds) is in parentheses and was estimated using seasonal means. Age Year 0.1 0.2 0.3 0.4 0.5 Total 1987 1,460 1,067 4,189 4,200 314 11,230 (6,132) (7,149) (49,011) (63,000) (5,840) (131,132) 9 Table 4. Length-age distribution (in percent by inch group) for chinook salmon scale sampled during the creel census at Pentwater, Ludington, Manistee, Frankfort, Leland, Grand Traverse Bay, Manistee Lake, Big Manistee River, Betsie River, and Platte River, September-November, 19871. Age Length (inches) 0.1 0.2 0.3 0.4 0.5 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40+ 100 100 100 100 25 75 100 100 100 100 50 50 15 50 50 85 85 60 60 30 10 15 40 40 70 80 85 80 75 10 15 20 25 100 'Table developed by District 6 personnel at the Harietta warehouse. 10 Table 5. Number and weight, by age and sex, of chinook salmon harvested at the Medusa Creek weir, fall 1987. Male Female Total Week beginning Number Pounds Number Pounds Number Pounds Age 0.1 09/21 09/28 10/05 11/02 Total (Percent) Age 0.2 09/21 09/28 10/05 11/02 Total (Percent) Age 03 09/21 09/28 10/05 11/02 Total (Percent) Age 0.4 09/21 09/28 10/05 11/02 Total (Percent) Age 0.5 09/21 09/28 10/05 11/02 Total (Percent) 162 643 73 12 638 2,670 342 50 162 643 73 12 890 (13.0) 890 3,700 (13.0) (4.6) 638 2,670 342 50 3,700 (4.6) 616 2,870 675 258 86 364 93 32 575 (8.4) 162 1,147 226 77 541 2,436 608 184 3,769 (4.7) 1,817 12,981 2,486 845 10 56 7 8 81 (1.2) 75 434 67 74 650 (0.8) 1,620 7,982 1,197 986 96 420 100 40 656 4,419 (9.5) (5.5) 130 643 100 81 292 1,790 326 158 3,437 20,963 3,683 1,831 1,612 18,129 (23.5) (22.6) 954 11,785 (13.9) (14.7) 2,566 29,914 (37.3) (37.3) 289 1,147 233 254 1,923 (28.0) 16 84 40 44 4,230 17,233 3,532 3,800 28,795 (35.9) 95 252 206 93 646 (9.4) 1,506 3,766 3,077 1,460 9,809 (12.2) 152 384 1,399 439 347 5,736 20,999 6,609 5,260 2,569 38,604 (37.4) (48.1) 315 1,540 743 818 8 16 84 40 52 192 (2.8) 315 1,540 743 970 3,568 (4.4) 184 3,416 (2.7) (4.3) 8 152 (0.1) (0.2) Table 6. Mean total length (inches) and weight (pounds), by age and sex, of chinook salmon harvested at the Medusa Cekwifl 97 Two standard errors in parentheses. Age 0.1 0.20. Week Measure - ___________ beginning ment Male Female Male Female Male Fml 09/21 Length 22.5 26.2 28.5 33.4 3. (0.259) (0.933) (2.082) (0.492)(048 Weight 3.9- 6.3 7.5 11.2 1. (0.167)- (0.545) (2.082) (0.363)(035 09/28 Length 22.8- 26.8 30.8 33.5 3. (0.257)- (1.448) (1.500) (0.407)(046 Weight 4.2- 6.7 7.8 11.3 1. (0.183)- (0.951) (2.500) (0.325)(065 10/05 Length 22.5- 26.1 30.0 32.8 3. (.0.579)- (1,143) (0.619)(069 Weight 4.7- 6.5 9.5 11.0 1. (0.310)- (0.722) (0.373)(063 11/02 Length 23.3- 25.9 30.5 32.8 3. (1.453)- (1.130) (1.000) (0.515)(047 Weight 4.2- 5.8 9.3 11.0 1. (0.333)- (0.535) (0.500) (0.346)(04) Weighted Length 22.7- 26.5 30.4 33.3 3. seasonal (0.192)- (0.925) (1.143) (0.299)(034 mean Weight 4.2 6.6 8.0 11.2 1. (0.134)- (0.605) (1.873) (0.235)(046 Sexes Length 22.7 27.0 3. combined (0.192) (0.934)(023 Weight 4.2 6.7 1. (0.134) (0.568)(021 Table 6. Continued: Age 0.4 0.5 Week Measurebeginning ment Male Female Male Female 09/21 Length 36.1 35.3 39.1 (0.347) (0.412) (0.970) Weight 14.6 15.9 19.7 (0.366) (0.427) (1.166) 09/28 Length 36.6 35.3 38.3 (0.397) (0.816) (1.667) Weight 15.0 14.9 18.3 (0.496) (0.841) (1.202) 10/05 Length 35.8 34.3 37.7 (0.492) (0.414) (0.760) Weight 15.2 14.9 18.6 (0.557) (0.465) (1.276) 11/02 Length 35.7 34.8 37.5 36.5 (0.414) (0.489) (0.625) (1.000) Weight 15.0 15.7 18.6 19.0 (0.484) (0.670) (0.711) Weighted Length 36.3 34.9 38.0 36.5 seasonal (0.247) (0.345) (0.777) (0.866) mean Weight 15.0 15.2 18.6 19.0 (0.306) (0.364) (0.620) Sexes Length 36.0 38.0 combined (0.219) (0.746) Weight 15.0 18.6 (0.245) (0.594) 13 Table 7. Numbers, and in parentheses percent, by age, of chinook salmon in various year classes returning to Medusa Creek weir 1 to 5 years after stocking. Age Year Number class stocked 0.1 0.2 0.3 0.4 0.5 Total 1983 315,4951 - - - 4,200 - 4,200 - - - (1.3) - (1.3) 1984 500,108 - - 4,189 - - 4,189 - - (0.8) - - (0.8) 1985 243,820 - 1,067 - - - 1,067 - (0.4) - - - (0.4) 1986 299,975 1,460 - - - - 1,460 (0.5) - - - - (0.5) 'Stocked in the Jordan River. 14 LITERATURE CITED Hay, R. L. 1988. Little Manistee River harvest weir and chinook salmon egg-take report, 1986. Michigan Department of Natural Resources, Fisheries Technical Report 88-3, Ann Arbor. iReport approved by W. C. Latta Report approved by W. C. Latta Typed by G. M. Zurek I, II ý:".'-, --, ý..", I -:,:, ý,.,, ",:, ý ý -,ý...... ýý. -,-- - -- ' - ',---,,ý., -.,, -,:r'.:, - ý -,, 'ýý, ý,.:ý. " ':, -- ý, I,. 11.,,,ý..,,. ",ý, -, I,I, - -.,,,. - - I -,:, ý -, ý:;-ýý, --, -, I I, ", -. -:., ý., -. I - - ý 1, hý -ý,.''- ý ý,-,-.,`?,ý - ý,,-!,ý,,: '.:.- ý, ",:.-- I 1., -,,, ",,,- iý',,ýý -,.. I - -. 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