Average growth rates of fishes in Michigan. (Fisheries research report: 1675)
Laarman, P. W.
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Page  1 INSTITUTE FOR FISHERIES RESEARCH DIVISION OF FISHERIES MICHIGAN DEPARTMENT OF CONSERVATION COOPERATING WITH THE UNIVERSITY OF MICHIGAN GERALD P. COOPER PH.D. Report No. 1675 ADDRESS DIRECTOR UNIVERSITY MUSEUMS ANNEX ANN ARBOR. MICHIGAN August 29, 1963 AVERAGE GROWTH RATES OF FISHES IN MICHIGAN By Percy W. Laarman State-wide average growth rates for several fishes in Michigan were determined previously (Fish Division Pamphlet No. 26, by Wm. C. Latta). Age and growth data obtained more recently have been added and a new summary of average growth rates prepared. A total of 121. 419 fish representing 17 species are involved in the present summary. For 8 species sufficient data were available to permit the computation of reliable averages for lengths attained at various months of the growing season. For fishes collected after January 1 but before the annulus had formed in the spring, the scale margin is counted as an annulus. in other words, all fish have a "birthday" on January 1. Lengths were recorded as total length at time of capture. Information on sex and method of collecting was often lacking; therefore sexes were combined and collecting methods are not treated here in establishing the averages. The average length for each age group of each species in each daily collection for each body of water is the basic statistical unit; each daily average was given equal weight in determining the growth-rate averages

Page  2 -2 - Revised averages for 17 species of Michigan fishes are shown in Table 1; averages compiled earlier are included for purposes of comparison. Generally, the greatest differences between the "old" and "new" averages occur where relatively few samples are represented in the old averages. Differences between the two averages trend toward an increase in mean length for the more important game fishes. The monthly growth averages (Table 2) are valuable in that they make possible a more precise evaluation of rate of growth in any given body of water. With only the annual averages for comparison it is difficult to judge the quality of growth in different waters when collection dates are scattered throughout the growing season which, for fish, lasts about 6 months (May to October). The monthly growth averages are given only for those species and age groups (0-IV) for which collections are adequate for this purpose. In this monthly summary, samples were combined for the months of January through April, and again for October through December, because very little growth takes place then. Theoretically, the average for October through December for a given'age group should be the same as the average for January through April of the next older age group. Discrepancies that occurred were probably due to an insufficient number of samples or to selectivity of collecting gear. INSTITUTE FOR FISHERIES RESEARCH Percy W. Laarman Report approved by G. P. Cooper Typed by M. S. McClure

Page  3 Table 1. — Average total lengths in inches, for each age group of several fishes in Michigan (Number of fish in parentheses. Asterisk denotes revised average. The "old" average is below.) Sp s Age-group Spec I II III- IV V VI VII VIII IX X XI XII XIII Yellow perch* Yellow perch 3. 1 (289) 2. 5 (85) 4. 6 (2, 861) 4. 2 (782) 6.1 7.0 (6, 199)(6, 874) 5.8 6.8 (1, 958)(2, 439) 8. 0 9.0 (5, 213)(2, 686) 7.9 8.8 (1, 878)(1, 106) 9.9 (1, 300) 9. 8 (581) 10.7 (666) 10.4 (313) 11.3 (297) 10.8 (194) 11.8 (144) 11.4 (78) 12. 3 (24) 12. 2 (19) 12. 3 (4) 13. 3 (2) 13. 9 (5) 13. 9 (4) 13. 2 (3) 13. 1 (2) Blue gill* Blue gill 2.3 3.4 (278)(3, 090) 2. 1 (51) 2. 9 (1, 521) 4.4 5.5 (6, 252) (10,160) 4.3 5.5 (1, 713)(2, 679) 4.4 5.2 (3, 220) (4, 152) 6.4 7. O (10,306) (4, 988) 6.5 7.3 (2, 620)(1, 767) 5.9 6.4 (2, 864)(1, 171) 7. 5 (2, 346) 7. 8 (1, 258) 6.9 (507) 7.9 (890) 8. 0 (577) 7. 3 (186) 8. 6 (402) 8. 5 (237) 7.8 (51) 8. 8 (147) 8. 5 (95) 7.4 (8) 9. 1 (37) 9. 2 (31) 8. 1 (6) 9. 8 (11) 9.7 (6) 9. 7 (9) 8.4 (2) 12.1 (1) Pumpkinseed' 2.8 3.3 (82)(1, 260) 9. 8 (1) Pumpkinseed 2.0 (20) 2.9 (326) 4.1 4.9 (494)(1, 224) 5. 7 (681) 6. 2 (455) 6. 8 (231) 7.3 (77) 7. 8 (26) Black crappie*^ 3.6 5.1 (49)(1, 155) 6.8 8.2 (2, 118)(1, 573) 9.0 (1, 009) 9.5 (448) 10. 6 (199) 10.9 (83) 11. 8 (22) 12. 2 (12) Black crappie 5. 9 8.0 (430) (336) 9.0 (253) 9. 9 (143) 10.7 (113) 11. 3 (40) 11.6 (8) Rock basso 1.27) (27) 3. 1 (299) 4.5 5.6 (1. 273) (1, 658) 6.5 7.4 (1,770)(1, 094) 8. 2 (661) 8. 9 (386) 9. 6 (198) 9. 9 (93) 10.1 1 1. 6 11 7 (34) (3) (1) Rock bass 1. 5 (17) 3. 2 (176) 4.3 5.2 (348) (498) 6. 2 (630) 7, 3 (338) 7. 9 (183) 8. 8 (129) 9.0 (92) 9.9 10.5 (42) (13)

Page  4 Table 1. — continued Age-group Species I II III IV V VI VII VII IX X XI XII _.... _...... XIII Largemouth bass* 3.6 6.1 8.6 10.6 (696)(1, 874) (2, 599)(1, 885) 12. 2 (1,224) 12. 1 (368) 13.6 (660) 13.7 (285) 15.1 (299) 15.1 (111) 16.7 17.7 18.8 (179) (74) (45) 19.8 19.6 (22) (10) 20. 8 (2) Largemouth bass 3. 3 (174) 6.1 (321) 8.7 10.0 (419) (505) 16.1 17.7 17.9 (71) (33) (20) Smallmouth bass'' Smallmouth bass 3.4 (232) 6.1 (383) 9. 2 11.3 (801) (574) 9.0 11.2 (95) (158) 13. 3 (376) 13. 3 (128) 14. 9 (238) 15. 0 (79) 15. 7 (147) 15. 3 (45) 16.8 17.5 (81) (44) 18. 5 (28) 19.2... (14) 19.2. (1) 3.3 5.9 (33) (53) 16.4 16.8 (20) (9) Northern pike'* Northern pike 10.2 15.6 (186) (1, 929) 7.9 15.5 (16) (498) 19.4 22.2 (2, 394)(1, 193) 24. 6 (513) 23. 9 (257) 26. 5 (212) 25. 4 (131) 28. 9 (123) 27.7 (62) 32.7 33.4 (50) (19) 32.5 37.1 (33) (9) 38.7 (7) 34. 8 (6) 39.6 42.0 (4) (1) 44.4 (4) 4'8.0 (1)... 30. 5 (1) 19.4 (1, 329) 22. 2 (623) Walleye* 7.1 9.5 (42) (256) 13. 3 (567) 12.0 (91) 15.2 (386) 17 2 (551) 18. 6 (500) 19. 2 (433) 19.6 21.6 (259) (103) 21.4 (45) 25.2 23.7 (23) (9) 26. 5 (9) Walleye 6.6 (4) 9.1( (42) 15. 9 (138) 17. 8 (316) 18. 9 (256) 18. 8 (209) 18.8 21.4 (130) (44) 19. 7 (10) 22. 6 (3) 28.5 (3) Muskellunge * 6. 8 (52) 15.7 (3) 19. 9 (20) 25.4 (32) 31.9 (12) 34. 7 (24) 36. 8 (29) 39.2 41.7 (37) (39) 45. 3 (11) 48.7 47.5 49.7 (4) (12) (5) Muskellunge 6. 8 (52) 15. 8 (2) 19. 9 (13) 26. 2 (21) 32.4 34. 6 (11) (23) 36.8 39 2 41.1 (28) (37) (28) 45. 3 (11) 51.9 47 5 (3) (12) 51.8 (3) Grass pickerel* 3.1 7.8 (1) (15) 9.5 (6) 9. 6 (15) 10. 2 (10) 10.4 (14) 10.9 (3) Grass pickerel 3. 1 (1) 7.0 (4) 7.7 (1) 10 3 (5) 10.5 9.1 (5) (11)

Page  5 Table 1. —concluded Age-group Species O I I VI VII VIII IX X XI Xil XIII Warmouth:: 3. 1 (19) 4. 4 (118) 5. 2 (334) 5. 5 (244) 6.2 (160) 6.7 6.9 6.6 7.5 7 3 (116) (55) (18) (4) (1) Warmouth 2.0 (3) 4. 2 (29) 4. 8 (89) 5. 5 (127) 6. 1 (105) 6.5 6.7 6. 7 (70) (48) (18) 7.9 (2) 7. 3 (1) Green sunfish'^ Green sunfish o 3.0 (47) 3, 2 (6) 3,9 4.7 5 1 (125) (219) (139) 5.7 (54) 5, 1 (23) 5. 7 (5) 5. 8 (3) 5. 0 (2) 4. 3 (1) 3.7 4 5 (55) (65) 5. 0 (59) Longear sunfish' 1.5 (1) 2. 5 (22) 3. 2 (65) 3. 8 (78) 4. 0 (65) 4. 3 (7) 3.7 (1) 4 3 (1) I I Longear sunfish 1.5 (1) 2,4 (19) 3 2 (22) 3. 8 (35) Smelt: 5.3 6.9 7.7 (20) (379) (198) Smelt Cisco; Cisco 4. 2 (12) 7.0 (93) 8.4 9.7 (161) (286) 7. 8 (100) 10. 6 (311) 10. 3 (253) 4, 1 (39) 8. 1 (35) 8, 2 (35) 11 6 (36 6 11. 5 (183) 8. 7 (2) 4. 2 (5) 8. 8 (3) 12. 8 (216) 11.5 (111). 4.3 (1) 9.6 o.6 (1) 13. 9 (141) 13. 5 (72) 13. 9 (56) 13. 2 (32) 15. 6 (20) 13. 9 (2) 15 7 (4) 12.4 (1) 14 3 (1) 14. 2 (1) 19, 2 (1) 0 9.0 (33) 9, 6 (212) White sucker" 3. 5 (70) 8. 6 (261) 12. 0 (373) 14. 3 (443) 16, 3 (245) 16. 9 (9f7) 18. 1 18, 1 (20) (8)... 17.7 (1) 20. 9 (1.) White sucker 7,2 (40) 11. 6 (50) 13 9 (21) 18. 6 (9) 16.4 17 3 18.1 (3) (2) (1)

Page  6 Table 2. — State-wide average lengths at various months for several fishes of Michigan (Total lengths to nearest 0. 1 inch, number of fish in parentheses) Month AgeA ge - --------------------------------------- Species Jan. - Oct. - group group April May June July Aug. Sept. Dec. average Yellow perch 0..... 1.2 2.1 2.5 3, 7 3.3 3.1 (1) (20) (58) (181) (29) (289) I 3.9 3.7 4.3 4.8 5.2 5.2 4.6 4.6 (37) (230) (331) (549) (642) -(767) (305) (2, 861) II 5.3 5.5 5.8 5.8 6.1 6.7 6.5 6.1 (439) (354) (859) (1,327) (1,544) (1, 177) (499) (6, 199) III 6.4 6.9 6.8 6.7 7.0 7.6 7.5 7.0 (542) (353) (798) (2, 054) (1,581) (1, 090) (456) (6, 874) IV 7.0 7.8 8.0 7.7 8.1 8.6 8.7 8.0 (395) (264) (629) (1,649) (1,314) (628) (334) (5, 213) Bluegill I 3.0 2.4 2.8 3.2 3.4 3.8 3.9 3.4 (252) (138) (422) (419) (349) (913) (598) (3, 090) II 3.8 3.7 3.9 4.4 4.7 4.6 5.1 4.4 (344) (676) (755) (945) (1,469) (1, 257) (806) (6, 252) III 5.0 4.9 5.3 5.5 5.7 5.9 5.8 5.5 (1, 044) (981) (1, 834) (1, 545) (1 734) (1,950) (1,072) (10, 160) IV 5.9 5.9 6.4 6.4 6.6 6.6 6.5 6.4 I* (2,140) (1,400) (1,640) (1, 524) (1,536) (1,229) (837) (101 306)

Page  7 Table 2. — continued Month AgeSpecies Jan- Oct.- group group April May June July Aug. Sept. Dec. average Pumpkinseed I 4. 3 (11) 4.3 (72) II III IV 2.4 (12) 3. 8 (225) 5.0 (445) 5.9 (415) 2.7 (106) 4.14 (448) 2. 9 (252) 4. 2 (708) 3. 3 (282) 4. 4 (760) 3.7 (409) 4. 6 (600) 5. 6 (720) 6.2 (330) 3. 8 (188) 3. 3 (1, 260) 4. 9 (188) 5. 9 (258) 5.1 (813) 6.0 (655) 5. 2 (854) 5. 8 (608) 5. 2 (945) 5. 9 (482) 4. 9 (407) 5. 5 (187) 6.0 (116) 4.4 (3, 220) 5. 2 (4, 152) 5.9 (2, 864) Black crappie I II III IV 4.4 (3) 5. 5 (102) 7.7 (165) 8. 5 (94) 4. 1 (92) 6.2 (320) 7.5 (185) 8. 8.(211) 4.0 4. 3 5.0 (88) (136) (204) 5.9 6. 8 6.9 (278) (319) (406) 7.9 8.0 8.4 (235) (327) (343) 8.8 9.1 9.4 (82) (192) (142) 5.5 (424) 7.5 (41-2) 8.4 (216) 9.2 (204) 5. 7 (208) 7.6 (28j) 9.0 (102) 9. 2 (84) 5. 1 (1, 155) 6. 8 (2, 118) 8. 2 (1, 573) 9.0 (1, 009) Rock bass I 1.7 (1) II 3.5 (2) 2. 2 (7) 3.64 (34) 2. 6 (13) 4. 1 (85) 2.8 (46) 4. 2 (179) 3 0 (104) 4. 5 (298) 3. 7 (67) 4. 8 (359) 3. 8 (61) 5. 3 (316) 3. 1 (299) 4, 5 (1. 273) III IV 5.6 5.6 5.4 5.3 (18) (115) (229) (441) 5. 6 (471) 6. 5 (439) 5. 9 (315) 7.0 (211) 6. 3 (69) 6. 9 (34) 5. 6 (1,658) ( L 6 5 8) 6. 5 (1, 770) 6.4 5.9 (39) (147) 6.4 (299) 6.4 (601)

Page  8 Table 2. — contiimed - A- - Month AgeSpecies Ja. - Oct. - group grip April May June July Aug. Sept. Dec. average Largemouth bass Smallmouth bass 0 1.1 (2) I IV 4.4 (24) 6.9 (115) 9.4 (130) 11.7 (184) 4.1 (74) 7.2 (348) 9. 8 (262) 11.6 (250) 4.5 (157) 7.6 (508) 10. 1 (307) 11.8 (213) 2.6 (23) 5.4 (227) 8.7 (419) 10.6 (373) 12.3 (221) 1.8 (18) 5.5 (85) 8.8 (206) 11.1 (147) 2. 9 (186) 6.4 (466) 9. 1 (460) 11.0 (332) 12.6 (148) 3.5 (97) 6.4 (133) 9.6 (247) 11.6 (208) 4.0 (352) 6.9 (604) 9.3 (488) 11. 1 (327) 12.4 (137) 3.4 (55) 7.0 (81) 10.0 (112) 11.7 (53) 4.0 (133) 7. 1 (322) 9.4 (261) 10.9 (154) 12.7 (71) 3. 8 - (62) 7.5 (63) 10.5 (77) 12.3 (15) 3.6 (696) 6.1 (1,874) 8.6 (2, 599) 10.6 (1,885) 12.2 (1,224) 00 0 I II III 3.4 (2) 7.6 (7) 11.0 (7) 2.9 (1) 7.5 (36) 10.6 (38) 4.0 (18) 8. 1 (116) 10.8 (106) 3.4 (232) 6. 1 (383) 9.2 (801) 11.3 (574) IV 10.4 (2) 12.7 (13) 12.7 3. 13.2 13.3 (55) (126) (122) 14.0 (41) 14.5 (17) 13.3 (376)

Page  9 Table 2. — concluded Month AgeSpecies Jan. - Oct. - group group April May June July Aug. Sept. Dec. average Northern pike 0...... 7.2 7.9 9.6 10.5 11.7 10.2 (2) (17) (22) (78) (67) (186) I 11.7 12.3 14.4 15.2 15.8 16.8 17.7 15.6 (20) (72) (344) (391) (438) (460) (204) (1,929) II 17.8 18.3 18.5 19.5 19.8 20.1 20.7 19.4 (145) (216) (426) (717) (404) (306) (180) (2, 394) III 21.1 22.0 22.1 22.5 21.9 22.4 23.3 22.2 (84) (58) (194) (394) (275) (127) (61) (1, 193) IV 23.4 27.6 24.8 24.1 24.5 25.2 24.3 24.6 (28) (11) (117) (182) (126) (34) (15) (513) CD

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