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Longlining

Longlining

Åsmund Bjordal, Svein Lokkeborg

ISBN: 978-0-852-38200-4

Sep 1996, Wiley-Blackwell

170 pages

Select type: Paperback

In Stock

$197.95

Description

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.
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.

Longlining is much more selective than any other form of fishing. It is therefore more environmentally acceptable It is one of the best methods for 'prime' species. Fish caught by this mehtod are less damaged and fetch a higher price. Longlining is technically more sophisticated than most other methods and demands more know-how The technical requirements and capabilities of the method and the economic pros and cons need to be carefully assessed before investing in longlining equipment.