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IMPORTANT ASPECTS OF FISHING VESSEL DESIGN

BY, SUMAN KUMAR M-TECH OENA 14NA60R01

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Introduction

Definition : Fishing vessel means a vessel that commercially engages in the catching, taking, or harvesting of fish.ORA fishing vessel is a boat or ship used to catch fish in the sea, or on a lake or river.

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Different kinds of fishing vessels:

• Commercial: Commercial vessels are most often custom-made and designed for professional fishermen. E.g- Fishing Trawlers, Seiners, Line vessels.

• Artisan : Artisan fishing boats are usually small traditional fishing boats, appropriately designed for use on their local inland waters or coasts.

• Recreational : Recreational fishing is done for pleasure or sport, and not for profit or survival.

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Unique features and capabilities of fishing vessel:Successful fishing vessel designs focus on some (or all) of the following aspects related to efficient ways of:• Locating• Catching• Processing• Containment• Landing ashore of the fish

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Types of fishing methods:

• Bottom fishing: bottom fishing is mainly achieved by dragging a large net near or adjacent to sea bottom.

a) Side trawling,b) Beam trawling andc) Stern trawling• Surface fishing: surface fishing is carried out at depths in the

seawater column above the bottom of the seabed and below the sea surface.

a) Purse seining,b) Pair seining,c) Grill netting etc

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Basic requirements of fishing vessel:

• Excellent seakeeping qualities• Minimum noise and vibration,• Safety of ship, crew and cargo,• Ability to find, track, and catch fish,• Ability to bring catch onboard,• Ability to process catch,• Ability to store catch (refrigerated if needed), and• Ability to deliver the catch ashore or to other vessel at

sea.DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE,

INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Hull form design criteria:

• Low resistance,• Excellent propulsive properties,• Excellent seakeeping,• Excellent maneuverability,• Easy to build/construct,• Good fish routing from deck to the processing and storage

spaces,• Accommodate all necessary system, navigational, working and

living spaces, and• Offer a safe and efficient working space with adequate (weather)

protection to those working out in the open spaces on deck.DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE,

INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Lines plan of fishing trawler:

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Resistance:

• Depending on the type of fishing to be carried out, the location of the fishing ground, and expected environmental conditions, the vessel resistance may be required to be quantifies listed in table.

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Various methods for resistance calculation:

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Methods to calculate calm water resistance:

• Holtrop & Mennen,• Guldhammer & harvald,• SNAME,• RINA,• Doust,• Keller,• A combination of the above.

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Percentage contribution of frictional resistance to total resistance in terms of froude number:

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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Propulsion:

• The propulsion systems of a fishing vessel must be able to serve two different condition:

1) Deliver sufficient pulling power during fishing conditions to be able to cope with extra resistance due to the fishing gear(nets, boards, lines, etc)

2) Deliver sufficient thrust in free sailing condition to attain the required free sailing speed.

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR

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THANK YOU

DEPARTMENT OF OCEAN ENGINEERING AND NAVAL ARCHITECTURE, INDIAN INSTITUTE OF TECHNOLOGY ,KHARAGPUR