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General approach
ToR 1: The existing knowledge within this consortium is large due
to the experiences of each individual partner. Literature and data (both technical
and economic) will be collected and organised. These allow for studying the economical
sustainability of different fishing techniques and vessels as a function of energy,
productivity (catches) and fish prices. From the study of existing knowledge two
reference fishing cases will be formulated. The plan is to consider a pelagic trawler,
and a bottom trawler case.
ToR 2: Further data for the reference fishing vessels cases will be collected by
onboard measurements as well as data from national projects already available. It
is anticipated that the fishing gear performance has a dominating influence on economics.
Therefore detailed numerical simulations are included in order to get a full understanding
of fishing gear effects on energy use and to find potential improvements.
ToR 3: For both reference fishing cases, a pelagic trawler and a bottom trawler
are considered, for which simulation models will be developed, capable of predicting
fuel costs. Energy consumption data will be split among the different operations,
including steaming, searching, catching, handling and storing on board. Full insight
of the efficiency overall and per component will make it possible to seek directions
for improvements. The proposed potential technologies cover: vessel design (dimensions
and new designs), propulsion systems (diesel electric vs. diesel direct, propeller,
etc.), onboard energy consumers (aux and freezing/cooling plants), and alternative
energy sources (bio-fuels, LNG, HFO, etc). Impact in fuel consumption, emissions
and costs will be predicted by simulation of alternative vessel and gear designs.
ToR 4: Based on the data and information gathered, the contractor will rank fishing
practices, for a given fish stock or group of associated fish stocks, in terms of
energy efficiency. Through analysis of energy consumption of the different devices
used at different phases of the fishing operation, it will be possible to identify
possible areas of action to increase energy efficiency and propose practical solutions
to achieve it. Replacement of energy intensive fishing methods by techniques requiring
a lower energy input will also be considered.
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