Akva EGERSUND NET User manual

REVISION 4

2 | User Manual for Sweep Nets | Revision 4 | December 2020
Our mission is to deliver solutions and services that optimise production and
contribute to sustainable, cost-effective and safe fish farms. We place great
emphasis on fish welfare, operational performance and profitability for our
customers in everything that we do.
A sweep net is special equipment used to remove fish from the net. It can be
manufactured in different sizes and using different types of materials, based on the
purpose for which it is intended. Sweep nets are used, for example, for collecting fish
for harvest, sampling when counting lice, and for different types of treatments.
Egersund Net is committed to producing high-quality, easy-to-use sweep nets, and in
this user manual we describe how you should handle our nets.
We keep our manuals as user-friendly as possible. To achieve this, we rely on your
feedback and on our collaboration with you as a user of our products. We highly value
every suggestion we receive, as it helps us deliver more effective and safer equipment.
You are most welcome to contact us if you have any comments or suggestions for
improvement.
The user manual for sweep nets is available on our website www.egersundnet.no,
and on our online equipment log Net-Reg at www.net-reg.no.
Together, we can help ensure that fish farming is an eco-friendly, sustainable and
growing industry that produces safe and healthy seafood for the global market.
This user manual is designed to meet the requirements of Norwegian Standard
9415:2009 and the NYTEK regulations. Egersund Net reserves all rights to this user
manual and its contents. Reproduction and distribution to third parties without our
clearly expressed prior approval are not permitted. We reserve the right to correct any
errors in the text or illustrations.
Warm regards,
Egersund Net
|
THANK YOU FOR CHOOSING
EGERSUND NET

User Manual for Sweep Nets | Revision 4 | December 2020 |
3
1INTRODUCTION.............................................................................. 4
1.1 Symbol definitions ..................................................................4
1.2 Contact information ................................................................4
1.3 Identification of sweep nets......................................................4
2CONSTRUCTION.............................................................................. 5
3OPERATION AND MAINTENANCE .................................................... 8
3.1 Using a sweep net ..................................................................8
3.2 Risk assessments/special environmental conditions.....................10
3.3 Maintenance .........................................................................10
3.4 Checklist ..............................................................................10
|
CONTENTS

4 | User Manual for Sweep Nets | Revision 4 | December 2020
1.1 Symbol definitions
REQUIREMENT: This symbol is placed next to text describing requirements.
NOTE: This symbol is placed next to text describing potential incidents and other aspects that you
should be aware of.
TIP: This symbol describes tips and advice in connection with the installation and handling of sweep
nets.
ESCAPE RISK: This symbol is placed next to text describing events and/or operations that may
increase the risk of fish escaping.
1.2 Contact information
If you have any questions about sweep nets, please feel free to contact us.
Delivery and visiting address:
Egersund Net AS
Svanavågveien 30
NO-4374 Egersund, Norway
Tel: [phone]
E-mail: [e-mail]
www.egersundnet.no
1.3 Identification of sweep nets
Each individual sweep net has a unique production number. All information related to
the production is recorded and archived with a reference to the production number.
| 1 INTRODUCTION

User Manual for Sweep Nets | Revision 4 | December 2020 |
5
The illustrations below show examples of different types of sweep nets.
| 2 CONSTRUCTION

6 | User Manual for Sweep Nets | Revision 4 | December 2020
Crane loops along the top rope for handling the sweep net. Loops at each end of the top rope, where a purse line can be attached.
Purse rings can be fitted along the bottom. Cut corners at the bottom. Purse rings fitted in
A purse line is threaded through these. bridles –a purse line is threaded through these.

User Manual for Sweep Nets | Revision 4 | December 2020 |
7
The illustration above shows an example of a small sweep net used when sampling fish.
Such nets are usually manufactured from lightweight netting and rope to make handling
easier.
For cone-shaped nets (e.g. ENCC coned nets), we recommend using sweep nets with
cut corners. This will ensure the sweep net is better adapted to the net it will be used
in.
Sweep net with square corners Sweep net with cut corners
(coned net, photo from test tank) (coned net, photo from test tank)

8 | User Manual for Sweep Nets | Revision 4 | December 2020
3.1 Using a sweep net
Before the operation begins, applicable procedures must be reviewed. The operations
manager or personnel with the appropriate experience and competence must be
responsible for the operation, and the various tasks must be assigned. The correct
personal protective equipment must be worn, and the right type of lifting equipment
must be used when using a crane. Optional equipment, such as cleaner-fish shelters,
must be removed or moved. Make sure that the sweep net is intact and undamaged. If
the centre weight under the net is to be removed, this must be done before the
operation begins. If a bead line or ball line is to be used, this must be made ready in
advance –see the Bead Line/Ball Line User Manual.
Wellboat placement depends on current
conditions in the sea. The boat always
lies between two moorings.
The sweep net can be run out into the net
through a block on the workboat.
| 3 OPERATION AND MAINTENANCE

User Manual for Sweep Nets | Revision 4 | December 2020 |
9
When collecting fish, place the sweep net
around the floating collar, in a semicircle.
The sweep net should be arranged along
the railing on the floating collar. The
bottom is lowered down along the net
wall to get depth in the cast.
When removing small quantities of fish
(e.g. when sampling), the sweep net can
be used across just a small part of the
floating collar.
When lifting the sweep net, we
recommend using crane loops fitted
between floats along the top rope.
When starting to gather the sweep net,
start lifting the sides and bottom as well.
The extent to which the sweep net is
gathered determines how many
fish are captured in the cast.
The sides and bottom are hung over the railing so that the sweep net forms a “bag”.
This is done towards the side where the wellboat is positioned. In some cases, it is the
wellboat itself that does the job of pulling the sweep net towards the boat.
NOTE: Use caution during this part of the operation to prevent folds from forming in the
netting where fish could be crushed.
As the fish are pumped aboard the wellboat, start to reduce the volume of the sweep net
so that the remaining fish are brought closer together. This must be done as slowly as
possible to ensure that the fish have sufficient volume and oxygen. In some cases, the
oxygen level must be monitored (for example, during fish treatments) and extra oxygen
added if needed. Lift the bottom via rings/bridles using a crane (or manually if the sweep
net is not too heavy). Use the purse line that is on the outer edge of the sweep net.

10 | User Manual for Sweep Nets | Revision 4 | December 2020
The float belt and sides at the end of the
sweep net can be lifted using a crane. The
other end of the net is run back to the
workboat through the block. The job of
running the net back again also helps to
“remove” excess netting.
3.2 Risk assessments/special environmental conditions
Sweep nets should only be used when weather and current conditions permit.
If folds form in the netting during the operation, be sure to dry the netting. This is to
ensure that fish are not crushed. You can use a net claw for drying.
Approved lifting equipment must be used when lifting a sweep net with a crane.
The sweep net must be removed from the net after use to avoid chafing on the net
and damage to the sweep net.
If you notice that the fish are becoming stressed, consider interrupting the
operation.
3.3 Maintenance
When the sweep net is not in use, it should be stored properly to avoid potential
damage.
We recommend using tanks/crates for storage, transport and disinfection. This will help
prevent the net from being exposed to sunlight and extend its life. If a sweep net needs
to be repaired, it can be brought in for service at any Egersund Net service facility. This
also applies if the sweep net is to be discarded. It will then be handled in accordance
with Egersund Net’s waste management procedures.
The lifespan of a sweep net depends on the way it is stored, used and
maintained/inspected.
3.4 Checklist
Before the sweep net is used, it must be checked to ensure that it has no damage that
may cause damage or holes in the net.
Check the following points before use:
Checklist item
What to inspect
Attachment point to roof net
Check that there is no wear and tear to ropes or loops.
Sharp edges
Check that there is no damage to components of the sweep
net that could cause holes in the net –such as rings, loops
or lead rope.

User Manual for Sweep Nets | Revision 4 | December 2020 |
11