Aug 082013

Over the past few years, the depletion of fish stocks has been a growing concern for policy-makers, fishers and environmental organizations alike. Debates on EU measures to protect bluefin tuna or cod fishing quotas, for example, make the headlines on a regular basis.

Aquaculture – the farming of aquatic organisms under controlled conditions – is seen as part of the solution to these overfishing-related issues. Currently accounting for 20% of Europe’s fish production, this industry is renowned for its high quality, sustainability and consumer protection standards. However, some major obstacles stand in the way of its further development, one of which being its impact on the environment: How can we ensure that aquaculture techniques allow for the preservation of local ecosystems while not slowing down the sector’s growth?  Read more …

Jun 072013

Last month, we told you about companies that are growing salmon on dry land. That’s an effective — but expensive — way to reduce water pollution caused by fish farms. After all, marine aquaculture provides about half of the seafood we eat.

So a Canadian researcher named Thierry Chopin is pushing to develop a less expensive technology that could be used to clean up the many fish farms that are already operating in coastal waters. His approach involves creating a whole ecosystem around a fish farm, so the waste generated by the salmon gets taken up by other valuable seafood commodities, like shellfish and kelp.

We caught up with Chopin, a marine biologist at the University of New Brunswick, in St. George, New Brunswick, a town on Canada’s Bay of Fundy. The bay is famous for its huge tides — which are 30 feet here at St. George — and for its salmon farms. Chopin has been working with a company called Cooke Aquaculture to reduce the fish waste that washes into the bay.  Listen to and read and more …

Apr 242013

Nofima_SuperfreshAfter several years of research, Nofima has arrived at a packaging method that enables salmon to stay fresh for up to 20 days. Superfresh is the name of the packaging that Vartdal Plastindustrier is launching at the seafood fair in Brussels this week.

Briefly, Superfresh is a form of packaging in which salmon is placed on a CO₂ emitter consisting of baking powder and citric acid, among other things, and then packed in such a way that air is removed from the pack before it is sealed. This packaging method is called MAP, or Modified Atmosphere Packaging. With the Superfresh method, the salmon can stay fresh for up to 20 days at a constant low temperature, or 10-12 days at four degrees above zero.

The initial research was intended to find a packaging method specially designed for cod and salmon fillet, but the same method could also eventually be used for other types of fish and also for meat.

“After the pack is sealed, the cushion develops CO₂ gas and it also has absorbent properties. This CO2 emitter has been adapted for the product, so that it does not change the fish’s pH value, and sensory tests have also shown that the fish often has a higher quality than with comparable packaging methods,” says Marit Kvalvåg Pettersen, Senior Research Scientist at Nofima. She has been responsible for the research over the last few years.

Read moore …

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Mar 192013
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Aquaculture South AfricaIt is often said of aquaculture, `manage the water and the fish will look after themselves’.  Whilst this saying is clearly simplistic it does indicate how important water quality and its’ management are to successful fish farming. slot machine game online
In aquaculture we stock our fish at elevated densities relative to the natural environment, causing the natural processes to happen faster than they would in the wild.  Fish and filter bacteria breathe, releasing carbon dioxide into the water which forms carbonic acid.  Also, during the aerobic breakdown of biological wastes, such as the conversion of ammonia to nitrate in a biofilter, hydrogen ions are released and accumulate.   This occurs as the carbonates and bicarbonates that the hydrogen had been attached to are stripped off and used by the aerobic bacteria.  Both of these processes cause the pH of the water to decrease.
The result is that the pH slowly slides downwards as the water becomes acidic.  For freshwater aquaculture most species are comfortable in the pH range of 6.5 to 8.0.  Left unchecked a decreasing pH can drop well below the 6.5 level, causing problems on various levels to the fish.
Low pH of the water causes the blood of the fish to become more acidic and therefore less able to bind with haemoglobin.  As the pH drops below 6.0 an increasing proportion of the nitrite in the water is present as nitrous acid which is the more toxic form.  Fish egg survival drops off rapidly when the pH drops below 6.5.  In a recirculating system, the bacteria in the biofilter cannot function properly at pH levels below 6.0, reducing the rate at which toxic ammonia is converted to less toxic nitrate.
In order to stabilise the pH we add a buffer to the system.  The buffer provides a supply of carbonates to attach to any free hydrogen ions when they appear.  As a result, the hydrogen ions never get a chance to accumulate and drop the pH, and the pH level remains fairly stable.
Various buffers can be used with consideration being given to availability, price, aggressiveness, solubility and composition.  Each buffer is a source of carbonate (or bicarbonate) that is attached to something else, and the something else may not be desirable in the system.  For example, sodium bicarbonate is freely available, highly soluble, inexpensive and non-aggressive, but the sodium is a problem in aquaponic systems.
How much buffer to use is best established by trial and error in your system, in accordance with the level of feeding, your choice of buffer and the alkalinity level of your source water.  The important rule is Go Slowly!  It is far better to add small amounts of buffer daily than a large amount once weekly.  As a guide, the amount you add should bring the pH up to around 8.0 (6.8 in aquaponics). If you raise the pH to above 8.5 the ammonia in the system becomes more toxic and should there be any hydrogen sulphide around it too becomes more toxic, so do not overdo it.
Remember, manage the water and the fish will look after themselves.
For more information about South Africa aquaculture, click here!
Nov 122012

NORWAY – Norwegian aquaculture over the last 40 years has become a huge industrial industry that produces one million tonnes of healthy seafood per year, creating large values ??along the coast. A key success factor has been the continuing research and innovation.

Research and development have been important initiatives in a number of areas. Innovative technology is vital to ensure sustainable growth.

Read more …

May 292012

A seaweed considered a threat to the healthy growth of coral reefs in Hawaii may possess the ability to produce substances that could one day treat human diseases, a new study led by scientists at Scripps Institution of Oceanography at UC San Diego has revealed.

An analysis led by Hyukjae Choi, a postdoctoral researcher in William Gerwick’s laboratory at Scripps, has shown that the , a tiny known as a “cyanobacterium,” produces  that exhibit promise as anti-inflammatory agents and in combatting bacterial infections. The study is published in the May 25th issue of the journal Chemistry & Biology. Read more …

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May 092012

Five years ago, algae was the “it” feedstock in the biofuel realm. The idea of taking an organism that feeds off of CO2 and using it to create fuel was as intoxicating to research scientists as it was to venture capitalists. Financing was available to fund the placement of extremely expensive photobioreactors next to power plants. Decades-old research from the National Renewable Energy Lab proved that some strains of algae could effectively be used to create high-grade fuels. Startup CEOs talked of being able to produce algae-based biofuels cheaply and at a large scale within the three to five years. Read more …

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May 082012

Recirculating technology, a key part of future aquaculture Technology that reduces water consumption by around 98 per cent, is a key feature of new recirculating systems now available to the global aquaculture industry, according to an aquaculture specialist speaking before this week’s Australasian Aquaculture Conference 2012 conference in Melbourne.

Professor Thomas M Losordo, who presented at the Aquaculture Recirculating Technology Short-Course at the Northern Melbourne Institute of TAFE (NMIT), said such technology must be part of the future for the rapidly growing aquaculture industry. Read more …

May 072012
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OCTABlog has interviewed aquaculture expert, Bill Manci.  In the interview he talked policy and food security. Mr. Manci also shared his thoughts on:

  • Recirculating Aquaculture Systems
  • Starting an aquaculture operation
  • Expanding an aquaculture operation

Bill Maci photoBill Manci, president of Fisheries Technology Associates, Inc., created the company in 1982 after receiving his formal training in zoology and fisheries science at the University of Wisconsin-Madison, and after a six-year career in aquaculture research.  Bill has been a consultant since 1980 and has worked on many types of aquaculture and fish farming projects throughout the U.S.A. and other nations.  He also has published more than 300 technical and popular articles on the subjects of aquaculture and fish farming, and served as an expert witness in aquaculture and fisheries-related litigation.

Read the interview here. usa deposit options for online casinos