Books  Sustainable Development  Water Resources & Management  Marine Resources & Management 

Longlining

By: Åsmund Bjordal (Author), Svein Løkkeborg (Author)

170 pages, b/w photos, b/w illustrations, tables

Fishing News Books

Paperback | Dec 1996 | #54962 | ISBN: 0852382006
Availability: Usually dispatched within 5 days Details
NHBS Price: £120.00 $153/€143 approx

About this book

Longlining is becoming increasingly more important as a method of fishing commercially for certain prime species of fish- particulary in the face of declining stocks. Longlining is much more selective that any other form of fishing and is thus more environmentally acceptable. Furthermore, longlining allows for the targeting of particular prime species and fish caught by this method are less damaged and thus hold a higher value. Despite the many major benefits of longlining, there are, as yet few books which address the technical and economic aspects of this method of commercial fishing. Written by an expert, this new book describes the principles and development of longlining fishing and explains the action of chemical sensing in fish and their behaviour towards baited hooks. Details of gear construction, the operation cycle for longlines, longline vessels and the different principles of mechanised baiting and on-board gear handling are provided and typical examples are given. The target species, gear parameters and catching efficiency, and the selective properties of longline gear are fully discussed whilst a concluding chapter compares longlining with other fishing methods.


Contents

Preface
The Authors

1. Introduction
1.1 Basic Definitions
1.2 Longline Fishing from Historical Perspective

2. Principles of Longline Catching Process
2.1 Passive and Active Fishing Gears
2.2 Feeding Behaviour and Chemical Sensing: The Basis for Fishing with Baited Gears
2.3 How Fish Locate Baited Longlines
2.4 The Hooking Process

3. Gear Construction, Operation and Vessels
3.1 The Gear: Mainline, Snoods, Materials, Hooks, Hook Spacing and Bait
3.2 Methods of Settling Longlines
3.3 The Longline Fishing Cycle and Modes of Operation
3.4 Mechanised Longlinning
3.5 Longline Vessels
3.6 Electronic Instrumentation
3.7 Safety Aspects of Longlinning
3.8 Handling of the Catch
3.9 The Longline Fisherman

4. Main Target Species and the Relative Importance of Longlining
4.1 Tuna in the Atlantic, Indian and Pacific Oceans
4.2 Groundfish in the North Atlantic
4.3 Groundfish in the North Eastern Pacific
4.4 Hake in the Atlantic

5. Gear Parameters and Catching Efficiency
5.1 Research Methods
5.2 Natural Bait
5.3 Artificial Bait
5.4 The Hook
5.5 The Snood and Snood Attachment
5.6 Hook Spacing
5.7 The Mainline
5.8 Bait Loss and Other Factors Affecting the Catching Efficiency of Longlines

6. Selective Properties of Longline Gear
6.1 The Importance of gear Selectivity
6.2 Species Selection
6.3 Size Selection

7. Longlinning Compared with other Fishing Methods
7.1 The Relative Catching Efficiency of Longlinning
7.2 Responsible Fishing
7.3 Effects on Fish Scotks and Fisheries Employment

References and Selected Literature
Glossary
Common and scientific names of some important longline target species
Index


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