Tustemena Lake 2006 - Cook Inlet Aquaculture Association, Kenai ...

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upstream near river mile 7.1. The number of smolts recaptured was then used to estimate the proportion of migrating smolts captured (the trap capture efficiency) and the total smolt migration. Statistical procedures for estimating the population of migrating smolts (N) followed the simple stratified M-R design for One-Site sampling experiments described by Carlson et al. (1998) where: U = total unmarked population size; N = total population size; N h = total population size in stratum h; u h = total number of unmarked smolts captured in stratum h; M h = number of marked smolts released in stratum h; m h = number of marked smolts recaptured in stratum h; L = number of strata or periods; and Uˆ = ∑ ˆ ∑ ( M + 1) L L h h N − = h= h M 1 h h= 1 mh + 1 The variance of the population estimate v(N) and the 95% confidence interval (CI) were estimated as: ∑ vN ( $ ) = vN ( $ ) = ∑ u ( M + 1)( n + 1)( M − m )( n − m ) ; and ( m + 1) ( m + 2) L L h h h h h h h= 1 h h= 1 2 h h This method assumes: ( CI) = N$ ±196 . v( N $ ) . • All marked fish released upstream pass the trap before the next release of marked fish; • The probability that a dyed or unmarked fish enters the trap equals the trap efficiency for all dyed or marked fish; • Fish are captured or not captured in the trap independently of the fate of other fish; • All fish entering the trap are counted, and; • Trap efficiencies do not change significantly during the smolt migration. The daily migration of sockeye smolts is presented in Appendix 2. 8
The proportions of age 1, age 2, and age 3 smolts were calculated using the data computed from the aforementioned notations and formulas with the following notations and formulas: U i = total unmarked population size for age class = i; U h = total unmarked population size for stratum = h; U hi = total unmarked population size for age class i, in stratum = h; P i = proportion of unmarked smolt for age class = i; P h = proportion of unmarked smolt for stratum = h; P hi = proportion of unmarked smolt for age class = i, in stratum = h; a i = total number of samples of age class = i; The estimated number of migrating age = i smolts was calculated as: U = ∑U Proportion of age = i smolts was calculated as: Pi = 1 ∑U hPhi U The variance of the proportion of age = i smolts in stratum = h was calculated as: v i ( P ) hi = Phi a h P hi ( 1− P ) h −1 The variance of the number of age = i smolts in stratum = h was calculated as: hi v 2 2 ( U ) = U v( P ) + P ( U ) − v( U )( P ) hi h hi hi h h hi Therefore, the variance of the estimated number of age = i smolts was calculated as: v ( U ) v( U ) i ∑ = hi Confidence intervals (95%) estimates for number of age = i smolts are: U ± 1. 96 v ( ) i U i Since 1976, ADF&G or CIAA has released sockeye salmon fry directly to Tustumena Lake or to Bear Creek, a tributary of Tustumena Lake, for rearing in Tustumena Lake. Since 1996, CIAA 9
Page 1 and 2: Tustumena Lake Sockeye Salmon Enhan
Page 3 and 4: DISCLAIMER The Cook Inlet Aquacultu
Page 5 and 6: ACKNOWLEDGEMENTS The 2006 Tustumena
Page 7 and 8: TABLE OF CONTENTS DISCLAIMER.......
Page 9 and 10: LIST OF FIGURES Figure 1. Area Map
Page 11 and 12: LIST OF TABLES Table 1. Tustumena L
Page 13 and 14: ABSTRACT The Alaska Department of F
Page 15 and 16: INTRODUCTION AND PURPOSE In July 19
Page 17 and 18: PROJECT AREA Tustumena Lake is loca
Page 19: METHODS CIAA’s 2006 Tustumena Lak
Page 23 and 24: Sockeye smolt characteristics (aver
Page 25 and 26: RESULTS AND DISCUSSION Environmenta
Page 27 and 28: RECOMMENDATIONS There are no recomm
Page 29 and 30: LITERATURE CITED Carlson, S.R., Cog
Page 31 and 32: APPENDICES 19
Page 33 and 34: Appendix 1. Kasilof River 2006 - En
Page 35: Appendix 3. Tustumena Lake 2006 - P

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