Title Page
Contents
Abstract 10
Abbreviation 12
I. Introduction 14
1. Background 14
2. Purpose of Research 17
3. Research Framework 18
II. Yellowfin Tuna Fishery in West Sumatra Waters 21
1. Fisheries Catch in West Sumatra Waters 21
2. Tuna and Tuna-like Species Catch in West Sumatra Waters 23
3. Yellowfin Tuna Catch in West Sumatra Waters 26
4. Consistently Used-the most Frequently in Operation Fishing Gear 30
4.1. Purse Seine 31
4.2. Longline 32
4.3. Handline 32
III. Materials and Methods 35
1. Study Site 35
2. Data Source 35
3. Total Cost, Landed Value, and Producer Price Index 40
4. Study Structure 42
5. Estimation of the Standardized Fishing Efforts for a Single Species Caught by Multiple Fisheries (1x3) 43
6. Equilibrium Model 45
7. Clarke-Yoshimoto-Pooley (CYP) Model 48
8. Maximum Sustainable Yield 49
9. Maximum Economic Yield 50
10. Allowable Biological Catch 53
11. NP of Individual Fisheries 57
IV. Result and Discussion 58
1. Standardized Fishing Effort 58
2. CYP Model to Estimate CPUE∞, q, k, and a[이미지참조] 64
3. Estimates of YMSY and FMSY[이미지참조] 69
4. Estimates of YMEY and FMEY[이미지참조] 72
5. Estimates of YABC and FABC[이미지참조] 75
6. Estimates of NP at the ABC Level 77
V. Conclusion 80
References 83
Table 1. West Sumatra fish production volume and value landed in Bungus 22
Table 2. Fresh tuna and tuna-like species caught by Bungus local fishermen volume and value in 2020 25
Table 3. Total costs, unit costs and producer price index of PS, LL, and HL 38
Table 4. Landed value 2004-2021 of Yellowfin tuna caught by three fisheries 39
Table 5. Production of Yellowfin tuna caught by the three fisheries 43
Table 6. Equation for equilibrium models for logistic and exponential function 47
Table 7. Estimation equation for logistic and exponential yield-effort relationship models 51
Table 8. Tier 1~3 determining the ABCs total allowable catch based on fisheries management system in Korea 54
Table 9. Tier 4~5 determining the ABCs total allowable catch based on fisheries management system in Korea 56
Table 10. The observed data and estimates of the general linear model (GLM) for 2004-2021 59
Table 11. Statistical result of the standardized CPUE 61
Table 12. Comparative analysis on the goodness of fit between the observed CPUE and the standardized CPUE 63
Table 13. Results of the Clarke-Yoshimoto-Pooley (CYP) model estimation 65
Table 14. Results of Schaefer, Schnute, WH, and Fox models estimations 66
Table 15. Biological coefficients estimated by the Schaefer, Schnute, WH, Fox, and CYP 67
Table 16. Coefficients estimated by the CYP model and estimates of YMSY and FMSY[이미지참조] 70
Table 17. Estimates of YMEY and FMEY[이미지참조] 72
Table 18. Result of the ABC estimation 76
Fig. 1. Design of research framework. 20
Fig. 2. Identification of Yellowfin tuna. 27
Fig. 3. Yellowfin tuna trend catch and effort in West Sumatra waters, 2004-2021. 29
Fig. 4. Purse seine operated by two vessels. 33
Fig. 5. Longline operated by tuna vessel. 34
Fig. 6. Handline operated by traditional boat. 34
Fig. 7. Map of Yellowfin tuna fishing ground showing study site. 37
Fig. 8. Diagrammatic representation of a fisheries bioeconomic model. 41
Fig. 9. Analysis of CPUE in both observed and standardized conditions. 58
Fig. 10. Yield-effort relationship comparison of CYP to the four more models. 68
Fig. 11. TR, TC, and NP of the Yellowfin Tuna caught by the three fisheries. 73
Fig. 12. Top view relationship between NP and fishing effort shares individual fisheries. 79
Fig. 13. Side view relationship between NP and fishing effort share individual fisheries. 79