Compilation of package of practices for energy conservation fisheries

Compilation of package of practices for energy conservation
Ashish sahu

Introduction
In recent years technologies aimed at the reduction of power
consumption and the emission of exhaust gases to the atmosphere by
marine energetic systems have been implemented more broadly.
On 01.01.2014 the IMO(International Maritime Organization)
introduced the requirement for new built ship to conform with the
developed Energy Efficiency Design Indexes (EEDI).
As far as the older vessels in operation are concerned it is advisable to
implement technological changes during repairs and inspections in
order to reduce fuel consumption and the emission of exhaust gases.

Energy saving operational activities
 The most important measures in that field which contribute to the reduction of fuel
consumption by the energy systems of fishing cutters, are as follows:
Maintaining optimal condition of the hull and the propeller
 The hull technical condition significantly affects its resistance in the aquatic
environment.
 Regular inspections of underwater hull should be carried out.
 Dents and organisms that cover the hull should be removed as well as damage to paint.
 Additionally, the resistance value may be reduced applying paints reducing friction
factor or antifouling paints and grinding and maintaining welds joining hull sheets.
 Likewise, the propeller performance may be maintained by polishing blades’ surface and
covering them with paint preventing fouling by sea organisms and reducing the friction
factor.

Energy saving logistic activities
• The most significant logistic activities may include:
Voyage planning
 The hull resistance and the quantity of fuel consumed are subject to velocity and sea
current directions, the height and the direction of waves, and the strength and direction
of the wind in relation to a cutter course.
 Therefore, it is recommended when planning cruise to use weather and nautical services.
Crew qualifications and training
 The selection of crew members of the high technical knowledge level and professional
experience allows for planned and deliberate operation of cutters in accordance with the
management requirements for efficient energy economy
 The level of knowledge may be improved by crew trainings on the management of the
energy economy and on the rules for the cooperation of particular energy system
devices.

Forecast savings regarding fuel consumption upon application
of technological innovations at fishing vessels
Innovation Forecast reduction of fuel consumption [%]
New structures of internal combustion engines 2-6
Hull shape optimization 8-10
Propeller shape and selection process optimization 3-6
Application of paint reducing friction coefficient 1-2
Grinding and maintenance of welds and hull and
propeller
2-5
Hull trim optimization 1-2

Methods of Energy Conservation in Fishing
 Fishing gear and methods
 Trawling is one of the most energy intensive fishing activity. It consumed nearly 5 times more
fuel compared to passive fishing methods such as longlining and gillnetting and over 11 times
more fuel compared to purse seining for every kilogram of fish.
 use of knotless netting in some trawl sections, use of thinner twine and large meshes in the
upper trawl sections, have been individually found to reduce netting resistance by 12 % and
total resistance of trawl by 7 %; use of cambered otter boards and optimizing the angle of attack
of otter boards have been individually found to reduce otter board resistance by 20 % and total
trawl resistance by 4% use of slotted otter boards have been found to reduce the otter board
resistance by 10 % and total trawl drag by 2%.
 Use of double rig trawling and pair trawling has been found to reduce the total trawl resistance
by 25-30 % and 30-35 %, respectively, compared to conventional trawling found that about 12
% reduction in trawl drag is possible when it is fabricated of knotless netting, compared to
knotted netting.

 Vessel technology
 Significant improvement in operational savings have been achieved by optimizing vessel
and machinery design. The power required to propel a vessel is mainly a function of
 (i) speed,
 (ii) length of water line and
 (iii) displacement, i.e., weight of the boat including crew, fishing gear, fish and ice.
1. Economic vessel speed
 Vessel speed is the single most important factor affecting fuel consumption of the vessel,
since the fuel consumption drastically increases as the vessel approaches maximum
speeds It has been shown that true savings in fuel consumption per nautical mile up to 37
% is possible in small fishing vessels by reducing the speed by one knot.
 During the studies conducted in Kerala, under a joint Indo-Norwegian programme on
energy conservation, it was found that a 10 % reduction in the free running speed of
mechanized vessels, reduced the fuel consumption by 35 %.

2. Length of waterline (LwL):
 By increasing length of waterline while keeping the other dimensions same, it is possible to
reduce the hull resistance and increase the speed.
 Although the weight of the vessel is increased in the process, the overall effect on hull resistance
is often beneficial.
 However increase in construction cost has to be balanced against fuel saving advantages.
estimated a 23 % saving in fuel by increasing the length of water line from 8.0 m to 10.0 m.

3. Displacement:
• Reduction in displacement also contribute to lower fuel consumption.
• Hull built of aluminum, FRP and plywood will be lighter than that of steel, ferrocement
and conventional wood construction.
• Fuel saving advantages in such cases has to be balanced against a possible reduction in
sea kindliness of the vessel.
• Gulbrandson (1986) has estimated that in a vessel of 8.0 m LWL, displacement 3.5 t and
service speed of 6.5 kn, a reduction in displacement by 14.3 % (from 3.5 to 3.0 t) could
result in fuel saving by 14 %.
4. Anti-fouling measures:
• In tropics, surface friction due to fouling is estimated to increase at the rate of 0.6 to 1.5
%.
• Fuel consumption due to fouling could increase by 7 % at the end of first month 44 % at
the end of six months and 88 % at the end of 12 months.
• Hence, periodic hull cleaning and application of antifouling paints can lead to
considerable savings in fuel.

Engines
Preventive maintenance of engines:
 The loss of efficiency of a badly maintained engine can be as high as 30 %
(Gulbrandson, 1986).
 Preventive maintenance of valves and injectors, turbo charging system, fuel and
air filters, mechanical drives and belts could result in a fuel saving of 10 %
 Preventive maintenance including regular cleaning or replacement of injectors, oil
changes as recommended by the engine manufacturers are very important practical
steps in conserving fuel and controlling pollution.
 Two-stroke outboard engines have low fuel efficiency. Wherever possible use of
more fuel-efficient diesel engines and four-stroke engines need to be promoted.

 Adoption of advanced technology
 Recent advances in technology have provided fishermen with equipment to reach the potential
fishing ground accurately
 (Global Positioning Systems); detect the presence of fish and monitor the success of capture process
acoustically (echo sounder, sonar, gear monitoring systems), thus saving the search time and fishing
time and hence saving energy.
 Progress in the satellite-based remote sensing techniques which use sea surface temperature and
ocean color to identify areas of potential fish abundance also greatly reduces the search time as
near-real time information is available to the fishermen.
 Installation of fuel flow monitors or vessel analysis computing systems on board fishing vessels
have been proven to lead to improved operational efficiency and energy optimization.
 Such devices provide decision support leading to management of engine and propeller in the most
economic manner in terms of vessel energy consumption
 Code of Conduct for Responsible Fisheries (FAO, 1995a) recommends the promotion of the use of
such devices on board fishing vessels.
 Multi-day fishing in place of daily fishing; are some of the fuel saving practices in fleet operation.

Sail-assisted propulsion:
 None of the vessels used sail as an energy saving measure.
 This is an area where technological innovations have to take place and where
extension work is required for popularizing the concept.

Reference
•www.google.com/energy saving technologies for fishing
vessels.
•www.google.com/approaches to energy conservation in
fish harvesting.

Compilation of package of practices for energy conservation fisheries

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