Offshore Marine Aquaculture

 

Situation

 

Intensive inshore aquaculture increased dramatically in the past decades. Fjords, Shelters and protected coastal waters are highly loaded by lices and pollutions, cause fish-diseases and destroy the environment.

The clean open ocean waters offer best living conditions for fish.

But the inclemency of oceans and the long distance from coastal basis

provide logistical, technical and economic restrictions.

 

Finding Solutions

 

Going offshore is the goal. But all existing reinforced floating cages,

whether round, square, conical shaped or globular, have their structural strength in the periphery of the cage and faces restrictions in

strength, size, function, feeding, harvesting, logistic and ocean inclemency

when going further offshore in exposed areas.

 

Consequence

The innovative new cage design is compensating all these offshore restrictions.  

Like the skeleton of big animals, the offshore Beck-Cage has its structural

strength not in the periphery as the inshore cages, but inside the cage.

The skin is the net of the cage.

 

The patented innovation – Beck-Fish-Cage

Consider and compair

 

The globular fish-cage of 3.000 m³ volume weighs 45 tons,

which is 15 kg/m³ cage colume and cost much over 180 €/m³.

 

The cylindrical Beck-Cage of  20.000 m³ volume weighs 90 tons,

which is 5 kg/m³ cage volume and cost less than 40 €/m³.

 

Offshore Fish Cage

Development (R&D)

 

Over 4 years, the cage was developed in the Atlantic.

An University made the static calculations.

R&D of the offshore fish farm was done with a cylindric cage of 20m length x 6m diameter and a 14m fish-cutter with feed stores and all service-equipment.

This fish farm unit anchored on a 40m rope for submerging the cage below wav trough and circulated over a large area to avoid any pollution. Cod-Fish were stocked.

The cage has a tow-force of 2.000 tons and resists over 20 m waves. This unit developed to

 

                MAC - Marine Aquaculture Centre +

          MASS - Marine Aquaculture Service Station

 

MAC (fish cage + second hand vessel) has a dragon sail, wind-solar energy, large feed stores, automatic pellet feeder, hatchery and management and research facilities.

 

The standard cage has a diameter of 16 m, a length of 100m and a volume of 20.000 m³ and produce about 500 tons fish/year. Statically, the cage can have a diameter of 24 m, a length of 100m and a volume of 45.000 m³ for 1.125 tons fish/year.

MAC or MASS can serve 3 cages, which produce 3.375 tons fish/year.

 

 

Technology

 

1.  Axial stable air chambers have prefixed volumes and let

     sink the cage below wave trough (about 20m), according to the

     principles of Archimedes.

 

2. Axial flexible air chambers with adjustable volumes

    submerge or lift the cage to required levels.

 

3. Air chambers around the cage revolve the cage to any

    position for fish-net cleaning, services and harvesting,

    grading and automatic dead fish collection.

 

4. In emergency cases, a high pressure air-bottle of about 1 m³

    and 50 bars, connected to the flexible air chambers, will be

    activated by radio control and lift the cage.

 

5. The one point moored cage floats permanently below wave

    trough and gets not damaged or lost by heavy storms and keeps

    the fish stressfree in turbulence-free water streams.
 

Management

 

The one point anchored offshore ocean fish farm with the submersible and revolving Beck-Fish-Cage is handled by:

 

- steering-cables for navigation and sensors to control: 

   depth – oxygen - water quality - mass, etc.

 

- oxygen hose supply liquid oxygen or air by diffuse pipes at

   bottom of the cage. Ship propeller stream water into the cage

 

- air hose for the flexible air chambers, for submerging and

   lifting the cage

 

- air hoses for the air chambers around the cage to revolve

   the cage into any required position

 

- feeding pipe for feeding each sections in the cage with the

   innovative pellet-injector.