Title Page
Contents
Abstract 7
Chapter 1. Introduction 9
Chapter 2. General Information 16
Chapter 3. Literature Review 20
Chapter 4. Analytical data and Methods 31
4.1. Data 31
4.2. Catch Per Unit Effort (CPUE) 35
4.3. Estimating population parameters 36
4.3.1. The Schaefer model 37
4.3.2. The Schnute model 38
4.3.3. The Walters and Hilborn model 38
4.3.4. Fox model 39
4.3.5. CY&P model 40
4.4. Estimating the Optimal exploitation levels 40
4.5. Bio- economic model 41
Chapter 5. Results 44
5.1. Fish production trend 44
5.2. Catch Per Unit Effort (CPUE) 45
5.3. Fish Population parameters 48
5.4. Maximum Sustainable Yield. 51
5.5. Estimating MEY and OAE 53
Chapter 6. Discussion 56
6.1. Landings trend 56
6.2. Catch Per Unit Effort (CPUE). 58
6.3. Overfishing 61
6.4. Population parameters and the suitable model 63
6.5. Optimal harvest levels 64
Chapter 7. Conclusion and Recommendation 67
References 73
Table 1. Fish production in (tonnes) from L. Baringo for the period 1995 - 2014. 32
Table 2. The annual fishing cost per net for the period between 2010 - 2014. 34
Table 3. Equations of logistic and exponential bio-economic models. 41
Table 4. CPUE for Tilapia and total production from Lake Baringo (1995 - 2014). 47
Table 5. Estimated biological and technological parameters for tilapia fishery. 50
Table 6. Summary of MSY and E MSY for Lake Baringo tilapia fishery. 51
Table 7. Summary of critical points of the CYP model for the tilapia fishery in Lake Baringo 55
Figure 1. Map of Lake Baringo showing the Islands and the fish landing beaches. 16
Figure 2. The tilapia and total fishery production trend from 1995 to 2014. 45
Figure 3. Tilapia and total production CPUE in tonnes/net/year from 1995 to 2014. 48
Figure 4. Sustainable yield curve showing the MSY of the tilapia fishery in L. Baringo. 52
Figure 5. Total revenue and total cost estimates based on the CYP model. 54