Posts Tagged ‘Open ocean aquaculture’


New Open Ocean Aquaculture Cage Design

November 30th, 2009 by jtuerk
Open Water Systems Ltd. has spent the last 5 years designing,testing and patenting a 50′ X 50′ X 36′  2500 cubic meter steel submersible cage for the aquaculture industry.  The new cage, designed by a fish farmer with 12 years experience, was carefully planned to provide a reliable rugged rearing unit that was both fish and farmer friendly.  The cage can be operated at surface in the same fashion as traditional surface cages allowing purse seine harvesting, stock inventory and inspection WITHOUT the need of diving.  The cube design allows the entire net to be secured from top to bottom providing a consistant rearing volume in high current and when towing.  The upper hinged walkway is repeated at the base of the four 36′ deep spars allowing the continuous netting attachment points.  The rubber insert torsion hinge design absorbs any movements between the spars and walkways minimizing metal fatigue.  The lack of horizontal plannes allows wave energy to pass through the structure minimizing the forces on the structure.
The Fish and Farmer Friendly Submersible Cage (Source: Open Water Systems Inc.)

The Fish and Farmer Friendly Submersible Cage (Source: Open Water Systems Ltd.)

Other advantages include:

1.) A bouyancy control system that allows a fully controlled ascend and descend through the water column.  The cage can be suspended at any depth in the water column in any depth of water.

2.) Top portion of cage can be raised 14′ to allow net inspection and cleaning.

3.) Cage cube allows various net designs and configurations.

4.) Capable of larger rearing volumes at reduced cost/cubic meter.

5.) Full scale open water tested in 5 meter seas.

Open Water Systems Ltd. is currently seeking companies  or individuals that are interested in using this cage in real production conditions.  The cage can be seen at www.openwatersystems.com.  We can be contacted @ 705 377 4044 or by email @ jefftuerk@hotmail.com.  The full size cage can be dismantled and container shipped worldwide.


Large-scale fish farming in the Gulf of Mexico

February 3rd, 2009 by Hayley

In the Gulf of Mexico, there has been much interest in innovation towards transforming unused offshore oil and natural gas platforms into fish farms. Some oil companies have experimented with platforms to anchor underwater pens.

This week a crucial step in this process has developed.  Authorities have approved the ardently debated proposal to allow large-scale fish farming in the Gulf of Mexico, creating the first federal regulations for a fledgling industry.

Opponents have cited concerns about damage to the Gulf’s environment, as well the effect on traditional fishing communities that have relied on catching and selling wild fish.

But supporters say the industrial-scale pens and cages could provide a new source of seafood, 80 percent of which now comes from imports.

Commercial seafood company owner John D. Ericsson favours the plan. He said the United States has fallen behind countries like Greece, Norway and Chile, where offshore farming has taken off.

Ericsson said his company, Florida-based BioMarine Technologies Inc., is looking at growing fish in cages that could contain up to 60,000 cobia, also known as king fish, and amberjack. He said it would take about $10 million to set up an offshore fish farm.

Despite approval Wednesday from the Gulf of Mexico Fishery Management Council, a 17-member regional advisory body that sets fishing regulations in the Gulf, the fish-farming plan still faces a series of administrative hurdles, and needs approval from the National Oceanic and Atmospheric Administration and the U.S. Department of Commerce.

Officials who developed the plan say it will be at least a year before anyone could apply for an open-ocean aquaculture permit, even with the necessary approval.

More than 100 environmental and fishing industry groups have signed on against the fish-farming plan, and many say they are hopeful the new Obama administration will quash the measure or send it back to the Gulf of Mexico Fishery Management Council for revisions.

One of the main complaints has been that offshore aquaculture regulations should be developed by Congress on a national scale, rather than by a regional body such as the Gulf council.

The Gulf council’s plan calls for 10-year permits to set up offshore fish farms.

Officials set a total cap on farmed fish production at 64 million pounds, and they expect about five to 20 such operations to emerge within the next 10 years.

Drafters say they have addressed a number of ecological concerns in the plan: It requires an up-front environmental analysis from anyone applying for a permit, mandates the hiring of an aquatic animal health inspector, and lays out numerous record-keeping requirements regarding escaped or diseased fish.


Comparison of aquaculture cages

November 16th, 2008 by Andrew

There are a number of blogs on the finfish site regarding different aquaculture cage technologies. However, there was little information in the way of a comparison between the different technologies. I came across a presentation which provides some insight. The presentation provides an interesting comparison of some aquaculture cage products commonly used in North America. The aquaculture cages compared are:

 

  • SeaStation by OceanSpar, USA
  • Aquapod by Ocean Farm Technologies, USA
  • OceanGlobe by Byks ASNorway
  • Ocean Drifter by MIT Sea GrantUSA

The presentation also considers some information on the economic viability of open ocean aquaculture of a number of important fish species. Finally, the economics of nearshore versus offshore aquaculture is considered.


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