A Population Assessment of Lake Sturgeon in the Namakan River ...

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TOTAL LENGTH (mm) 1800 1600 1400 1200 1000 800 600 400 200 0 y = 358.86x 0.3697 R 2 = 0.7981 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 AGE (years) Figure 11: Mean total length at age for lake sturgeon (sexes combined) captured in large mesh gill nets in Namakan River, 2006-08. TOTAL LENGTH (mm) 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 Rainy Lake, Ont/MN (Adams et al., 2006) Lake Winnebago, WI (Priegel and Wirth 1975) Menominee River, MI ( Barker 1980) Namakan River, Ont (McLeod, 2008) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 AGE (years) Lake of the Woods, Ont/MN (Stew ig 2005) Mattagami River, Ont (Now ak and Jessop 1986) Figure 12: Comparison of von Bertalanffy growth curve for lake sturgeon sampled in Namakan River to populations in Lake of the Woods/Rainy River, MN (Stewig, 2005); Rainy Lake, ONT/MN (Adams et al., 2006); Lake Winnebago, WI (Priegel and Worth, 1975); Menominee River, MI (Baker, 1980); and Mattagami River, ONT (Nowak and Jessop, 1987). 26
Table 4: Comparison of lake sturgeon population characteristics from the Namakan River, to other populations in Designatable Unit (DU) 6, including Lake of the Woods/Rainy River (Stewig, 2005), Rainy Lake (Adams, et al, 2006) and Seine River (McLeod, 1999). Parameter Namakan River (2006-08) Mean age 26.1 (yrs) Maximum age (yrs) No. age classes No. age classes (n>1) Lake of the Woods/Rainy River (2004) Rainy Lake (2002-04) Seine River (1993-95) 18.7 26.5 19.3 61 38 59 42 39 33 42 27 34 32 32 14 Mean total length (mm) 1,211 1,061 1,289 1,124 Maximum total length (mm) 1,746 1,810 1,660 1,676 % catch >1,000 mm 88.9 - 98.5 - % catch >1,400 mm 13.8 5.0 21.6 14.0 % catch >1,780 mm 0.0 0.1 0.0 0.0 Mean round weight (g) 11,858 10,500 13,720 10,874 Maximum weight (g) 36,350 40,500 48,000 29,900 L∞ (predicted) (mm) 1,298 1,776 1,404 1,343 K 0.110 0.048 0.110 0.102 To -2.267 -3.857 -0.560 -0.858 Age @ 1,000 mm (yrs) 12.8 13.4 11.0 12.4 S 0.944 0.877 0.953 0.922 A .0056 0.123 0.047 0.078 Z -0.058 -0.132 -0.048 -0.081 Age group 21-35 20-31 18-39 12-35 Mean Condition Factor (K) 0.608 0.674 0.617 0.630 27
Page 1 and 2: A Population Assessment of Lake Stu
Page 3 and 4: Abstract List of Figures List of Ta
Page 5 and 6: LIST OF TABLES Table 1: Physical an
Page 7 and 8: MDNR, 1995). Previous population as
Page 9 and 10: change, the daily catch and possess
Page 11 and 12: m 3 /sec respectively. Time exceede
Page 13 and 14: Sturgeon were also captured during
Page 15 and 16: observed, and only one large sturge
Page 17 and 18: To evaluate size selectivity and vu
Page 19 and 20: GIRTH (mm) 900 800 700 600 500 400
Page 21 and 22: Percent (%) 30 25 20 15 10 5 0 500
Page 23 and 24: was from the 1985 year class with 2
Page 25: Table 3: Mean total length and mean
Page 29 and 30: (Kallemeyn et al., 2003). Recent bi
Page 31 and 32: Mosindy and Rusak (1991) also repor
Page 33 and 34: history parameters used in manageme
Page 35 and 36: ACKNOWLEDGEMENTS I would like to ac
Page 37 and 38: Galarowicz, T. 2003. Conservation a
Page 39 and 40: Secor, D.H. 2008. Influence of skip
Page 41 and 42: October, 2008 Mesh Size Effort # St

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