Contents Chapter 1 Age and growth of bigeye tuna 1.1 Age and growth of bigeye tuna, using fin spines 1 1.1.1 Introduction 1 1.1.2 Materials and methods 2 1.1.4 Discussions 7 1.2 Age and growth of bigeye tuna, using vertebra 10 1.2.1 Introduction 10 1.2.2 Materials and methods 11 Chapter 2 Biological characteristics of tunas 2.1 A comparison of biological characteristics of yellowfin tuna 22 2.1.1 Introduction 23 2.1.2 Materials and methods 23 2.2 The length structure of bigeye tuna and yellowfin tuna catch 36 2.2.2 Materials and methods 38 Chapter 3 Integrated habitat index 3.1 A comparison of methods about the prediction of integrated habitat index 49 3.1.1 Introduction 49 3.1.2 Materials and methods 50 3.2 A comparison on calculation methods about an integrated habitat index 67 3.2.2 Materials and methods 68 Chapter 4 Tuna catch rate calculation methods 4.1 A comparison of two catch rate calculation methods 79 4.1.1 Introduction 79 4.1.2 Materials and methods 81 4.2 A comparison of catch rate on bigeye tuna of two longline fishing gears 94 4.2.1 Introduction 94 4.2.2 Materials and methods 95 4.2.4 Discussions 101 Chapter 5 Effects of fishing gear and environmental factors on catch performances 5.1 A comparison of catch performance between circle hooks and tuna hooks 105 5.1.1 Introduction 105 5.1.2 Materials and methods 106 5.1.4 Discussions 110 5.2 Effects of environmental factors and fishing gear on catch rates of sharks 113 5.2.1 Introduction 113 5.2.2 Materials and methods 115 5.2.4 Discussions 125 5.3 The relationships between the catch rates and the depth and sea surface 134 5.3.1 Introduction 134 5.3.2 Materials and methods 136 5.3.4 Discussions 141 5.4 Development of a three-dimensional numerical model for pelagic longlines 146 5.4.1 Introduction 146 5.4.2 Materials and methods 148 5.4.4 Discussions 161
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