International Training Course in Trawl Technology
At the North Sea Science Park Flume Tank,
Hirtshals, Denmark
For fishing gear technologists from the fishing industry, research
and education
October 28 – November 2, 2012
Objective
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The objective of the course is to give the participants an enhanced
understanding of trawl performance in practice, both from an
engineering, biological and a management point of view. Therefore catch
efficiency, fuel consumption, bottom impact, species and size
selectivity are all important topics for an optimal use of trawls and
keywords for the course.
The participants will study different commercial trawl designs in
the Flume Tank and learn how the performance and efficiency of the gear
is influenced by changes in net specification, rigging and towing
speed. This information will help the participants to select different
nets for different fisheries, and assist them in maintaining the trawl.
The participants will be informed of the ongoing research within
this field that relates to fish resource management and sustainability
e.g. development of species selective gears, measurement and
improvement of codend selectivity, as well as environmental impact of
fishing gear.
Form
The course is conducted as a residential course at the North Sea
Science Park in Hirtshals. It will take the form of both lectures in
the classroom on theoretical aspects and practical exercises carried
out in the North Sea Science Park flume tank.
Time
October 28 - November 2, 2012. Participants are expected to arrive
on Saturday, October 27. They are thereby likely to benefit from cheap
air-fares. The Course will start at October 28th at noon. The course
ends November Friday 2nd at noon, enabling most participants to return
before the weekend.
Content
Demonstration of the design, performance and operation of trawls
using scale models in the North Sea Centre flume tank. Introduction to
gear research topics like energy savings, computer aided design and
simulation of trawls, use of new materials, trawl door design and
performance etc. The existing knowledge of fish behaviour in and around
the trawl illustrated by means of underwater video recordings taken at
sea by cameras mounted on towed underwater vehicles observing trawl
performance.
Review of selectivity in fishing gear in general and trawl gear in
particular, and possibilities to change the selectivity pattern by
altering use and operation, design parameters, construction, etc.
Demonstration of various selection devices like grids, sorting panels
and windows. Information on gear selectivity characteristics including:
influence of cod-end design parameters on fish size selection and
utilization of fish behaviour differences to achieve species separation.
Other important aspects of trawl fishing operations: gear
legislation (technical regulations measures), requirements for catch
quality assurance and hygiene on board fishing vessels, fuel reduction
possibilities.
Programme
1st day: Trawl engineering performance,
Welcome and introduction,
Introduction to the flume tank,
2nd day: Trawl design
Construction of different trawls, both bottom trawls, pelagic and
semi-pelagic,
Design of trawls, and influence of different design parameters,
Flume tank demonstration of trawls for different fisheries.
3rd day: Forces acting on trawls
Trawl reaction to changes in rigging, towing speed, etc.,
The influence on towing resistance of mesh size, netting materials and
the orientation of the net bars relative to the flow, T0, T45 and T90,
Overview of the possibilities of reducing gear drag and hence fuel
consumption,
Maintenence of trawls.
4th day: Trawl selectivity
Fish behaviour in the catching situation,
Development of selective trawls for different fisheries,
Methods of studying mesh selectivity in cod-ends,
The influence on the size selection of fish of cod-end mesh size,
overall cod-end dimensions, netting materials and cod-end attachments.
5th day: Fish as food and a vital resource,
Morning visit to fish auction in Hirtshals,
Technical regulation measures and sustainable fisheries,
Handling of fish on board,
Influence of the fishing gear design on fish quality,
HACCP (Hazard Analysis and Critical Control Points) and other methods
of quality assurance on board,
Evening: Banquet.
6th day: Trawl doors
Demonstration of trawl doors and the influence of design parameters on
spreading force and towing resistance characteristics,
Evaluation, ending at noon.
Course organizers
Ulrik Jes Hansen, CATch-Fish, Hjørring, Denmark, and
Mike Montgommerie, SEAFISH, Grimsby, UK
in cooperation with SINTEF Fisheries and Aquaculture, Hirtshals
Participants
Everybody who in their professional life are involved with towed
fishing gear both from the industry, service industry representatives,
and research:
Fishing masters and fleet managers, net and trawl door designers and
manufacturers, fisheries biologists and technicians, fisheries college
lecturers / instructors, persons who have recently started working as
fishing gear technologists / researchers and other persons who want a
general introduction to the design and operation of modern commercial
fishing trawls.
It is anticipated that the course participants will have a basic
knowledge of fisheries and fishing gears.
Minimum number of participants: 12. Maximum number of participants: 20
Language
English
Accommodation
Course participants will be accommodated at the Motel Nordsøen. Meals
will be provided there and at the North Sea Science Park canteen.
Price
€ 2,800 including course fee, meals and accommodation, and transport
while in Hirtshals, but exclusive of VAT. Invoice will be forwarded on
22 September 2012.
Please note that the Danish Tax Authorities specify that training in
Denmark is charged with VAT. Registered companies in EU will have to
pay in their own country, but private persons have to pay Danish VAT of
25%. Registered companies outside the European Union does not have to
pay tax in EU.
Registration
Please forward registration to CATch-Fish before September 22, 2012.
Registration is binding from this date. Payment to CATch-Fish before
October 18, 2012.
Registration form
Please note
The organisers has the right to cancel the course in the event that
less than 12 participants register for the course.