The use of submersible cages allows farmers to
develop the aquaculture activities in exposed and
unprotected sea sites, improving the potential production of
a coastal region, while ensuring the environmental
sustainability of farming sites.
At the same time farmers can achieve a significant
improvement in quality in comparison with fish farmed in
traditional sheltered sites or land-based located.
The advantage to use a submersible cages compared to
traditional floating frames is to significantly decrease the risk
of loss of biomass and consequently the potential high
economic loss.
OCEANIS is the Badinotti's Group Cages product fully
committed to the submersible system.

OCEANIS 1
The technology used in OCEANIS 1 submersible cage best
combines the typical features of a floating cages, such as
the easy access and management during the day by day
farming activities, with the safety in terms of resistance to
force of the wave-motion allowed by a totally submersed
position.


OCEANIS 1 cage come from more than 10 year years of
offshore fish farming experiences.

The OCEANIS 1 is characterized by the following features:

1. Compensation chamber in the HDPE walkway pipes     
(alternately floodable by water or filled by air) located over
the cage net and at the waterline;

2. A ballast (sinker tube) located below the cage net
and made with a HDPE pipe filled with chains. The total
weight is  lower than the total buoyancy of the pipe.

The cage sinks by opening the air and water valves.

The water pressure pushes out the air contained in the HDPE
walkway pipes.

The lower ballast facilitates the sinking procedure. 

To make the structure floating it is necessary to carry out the
reverse procedure.

The inflow of air through the valves in the pipes pushes out
water which was previously inside the HDPE pipes.

The air pressure can be supplied with underwater bottles and
or low pressure compressor of at least 300 lt/min. in outflow,
with tank of at least 100 lt approx.
The cage floats by closing all the air valves.

The mooring system is the same used in floating cages: a grid
mooring system.

The reticular system is one of the best cost-effective ratio
mooring layout among all those used within cage farming
market.

Difference is a double buoys line: main mooring buoys
withstand the forces by the anchors and the grid mooring
buoys hold the cage weight while submerged.

By OCEANIS 1, all the activities involved in the ordinary
running of farms, like harvesting, sampling for biometric
measurements and any other related actions are carried out,
directly while cage is in floating position on the water surface.

In order to facilitate the handling procedures, the cage net is
fitted with a “removable” net lid in the top.

The net roof is equipped with a marine zipper (ultimate
Breaking Load= 4000 kg per linear mt) and is therefore easily
removable.

OCEANIS 2

The OCEANIS 2 submersible cage is characterized by the
following features:

1. Buoyancy pipes constantly filled with air, and then
always positive;

2. Compensation chamber ( alternately floodable by
water or filled by air) located under the cage net and
over a series of appropriate weights (ballast), generally
made of chains , with a total weight greater than the
buoyancy of the upper pipes.

The change in the cage attitude ( floating or underwater ) is
achieved by alternately filling and emptying the
compensation chamber.

So in the OCEANIS 2 management we can identify the
following cases:

a) Compensation chamber filled with air : The cage is in
flotation as the overall buoyancy of the HDPE pipes
(the compensation chamber) exceeds the weight of
the chains;

b) Compensation chamber flooded : the cage sinks and
the below chain starts to lean and fold on the sea
bottom until  the remaining chain , which is still hanging
and weighting below the cage and not yet laid on the
bottom, equals the buoyancy of the pipes. In this
condition we have a stable equilibrium. The theoretical
sinking bathymetry of this cage can be defined by
calculating the vertical distribution of weights placed
under the cage. Furthermore, the depth  level is also
related to the depth of the grid system. The maximum
sinking depth of the cage is generally twice the depth
of the grid system.

In this case the compensation chamber is similar to a “diving
bell”,  carried out with a hot dipped steel cylinder closed at
the top only.

The total volume of the diving bell and the upper HDPE pipes
must ensure an equal buoyancy to lift up enough length of
the chains used as ballast, to make cage floating.

The bell is located below the sinker tube by means of chains or
ropes. Weights  are installed under the bell.

The filling and the emptying procedures of the bell are
managed from the surface thanks to a flexible air pipe and a
valve closing.

The mooring system is the same used in floating cages: a grid
mooring system. In alternative can be used a single mooring
system with at least 3 mooring lines.

Even in OCEANIS 2, in order to facilitate the handling
procedures, the cage net is fitted with a “removable” net lid in
the top.


Side view of a mooring grid system with underwater and floatin g position of the OCEANIS 1 cage
RECOMMENDED DIMENSIONS AND APPLICATIONS OF THE OCEANIS SUBMERSIBLE CAGE SYSTEM

OCEANIS 1
Environment:                          Offshore
Minimum Sea Depth:             40mt
Minimum Cage Diameter:    25mt
Maximum Cage Diameter:   35mt
Maximum net depth:             8mt


OCEANIS 2
Environment:                          Offshore
Minimum Sea Depth:             50mt
Minimum Cage Diameter:    16mt
Maximum Cage Diameter:   20mt
Maximum net depth:             12mt 
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