Featured Research

from universities, journals, and other organizations

Nutrients from farmed salmon waste can feed new marine industry

Date:
November 23, 2012
Source:
The Research Council of Norway
Summary:
Waste from salmon production is currently being discharged into Norwegian coastal waters. Researchers say this is a resource that should be exploited for new biological production.

The researchers at SINTEF have successfully managed year-round artificial cultivation of sugar kelp sporophytes.
Credit: Silje Forbord

Waste from salmon production is currently being discharged into Norwegian coastal waters. Researchers say this is a resource -- worth NOK 6 billion each year -- that should be exploited for new biological production.

In 2009 Norwegian fish farms produced over a million tonnes of salmon and salmon trout; nearly 1.2 million tonnes of high-quality feed went into this production. But a considerable amount of feed administered is released to the surrounding waters as respiratory products, faeces and uneaten feed .

This means that a significant portion of the aquaculture industry's feed is actually wasted on fertilising the ocean with both organic and inorganic nutrients. The value of these nutrients is estimated at NOK 6 billion annually.

Higher economic yield, less pollution

In the project "Integrated open seawater aquaculture, technology for sustainable culture of high productive areas (INTEGRATE)," researchers have studied whether this waste can be put to use as nutrients for cultivating kelp and/or mussels. The project was headed by Associate Professor Kjell Inge Reitan of the Norwegian University of Science and Technology (NTNU) and received funding from the Research Council of Norway as part of the initiative to promote sustainable seafood production.

"The thinking is that integrated multi-trophic aquaculture (IMTA) will provide significant added value on investments in aquaculture," explains Dr Reitan, "while at the same time reducing potentially negative environmental impacts."

Environmental organisations are critical of aquaculture waste as ecologically detrimental.

Kelp can help: many application areas

Researchers carrying out experiments at the research institute SINTEF have documented good growth of kelp cultivated near aquaculture facilities. Mussel cultivation under similar conditions also shows promise.

Kelp can bind large amounts of the inorganic nitrogen and phosphorus discharged by fish farms. One of Norway's most common macroalgae species, Laminaria saccharina - known as sea belt or sugar kelp -- is particularly promising for industrial cultivation for use as a biofuel and feed additive and for extracting its chemicals. Dr Reitan is now collaborating with several companies looking to cultivate kelp for large-scale bioenergy production.

"Development in this area will need to be driven by players in bioenergy and feed production," asserts Dr Reitan. "I don't believe the salmon farming industry will get involved in commercially cultivating kelp in the near future, even though integrated production would give the industry a greener profile and enhance sustainability."

Kelp should grow all year

Based on industrial discharge figures from salmon production in Norway, the researchers estimate the annual potential for IMTA-method kelp at 0.6 to 1.7 million tonnes. The potential for mussels cultivated using IMTA methods is estimated at 7 200 to 21 500 tonnes. Cultivation on this scale would require 82 to 250 square kilometres of marine area. Worldwide, roughly 14 million tonnes of aquatic plants are cultivated annually.

Kelp cultivation needs to be a year-round endeavour in order to be efficient. The researchers at SINTEF have successfully managed year-round artificial cultivation of sugar kelp sporophytes (juvenile plants).

"This makes it possible to exploit the kelp's strong growth potential when conditions are favourable," says SINTEF Research Scientist Silje Forbord.

Quadrupling mussel cultivation

The researchers estimate that using IMTA methods to utilise Norway's salmon production waste nutrients, there is potential to achieve four times the current annual 3 000 to 5 000 tonne harvest of cultivated mussels.

The Research Council's research programme Aquaculture -- An Industry in Growth (HAVBRUK) has launched the research project "Exploitation of nutrients from Salmon aquaculture (EXPLOIT)" to determine how to design and locate kelp and mussel cultivation facilities for optimal utilisation of the aquaculture industry's waste nutrients.


Story Source:

The above story is based on materials provided by The Research Council of Norway. The original article was written by Torkil Marsdal Hanssen/Thomas Keilman. Translation: Darren McKellep/Carol B. Eckmann. Note: Materials may be edited for content and length.


Cite This Page:

The Research Council of Norway. "Nutrients from farmed salmon waste can feed new marine industry." ScienceDaily. ScienceDaily, 23 November 2012. <www.sciencedaily.com/releases/2012/11/121123092744.htm>.
The Research Council of Norway. (2012, November 23). Nutrients from farmed salmon waste can feed new marine industry. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2012/11/121123092744.htm
The Research Council of Norway. "Nutrients from farmed salmon waste can feed new marine industry." ScienceDaily. www.sciencedaily.com/releases/2012/11/121123092744.htm (accessed July 30, 2014).

Share This




More Plants & Animals News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Rodents Rampant in Gardens Around Louvre

Rodents Rampant in Gardens Around Louvre

AP (July 29, 2014) Food scraps and other items left on the grounds by picnickers brings unwelcome visitors to the grounds of the world famous and popular Louvre Museum in Paris. (July 29) Video provided by AP
Powered by NewsLook.com
Jane Goodall Warns Great Apes Face Extinction

Jane Goodall Warns Great Apes Face Extinction

AFP (July 29, 2014) The world's great apes face extinction within decades, renowned chimpanzee expert Jane Goodall warned Tuesday in a call to arms to ensure man's closest relatives are not wiped out. Duration: 00:58 Video provided by AFP
Powered by NewsLook.com
How Your Face Can Leave A Good Or Bad First Impression

How Your Face Can Leave A Good Or Bad First Impression

Newsy (July 29, 2014) Researchers have found certain facial features can make us seem more attractive or trustworthy. Video provided by Newsy
Powered by NewsLook.com
Rat Infestation at Paris' Tuileries Garden

Rat Infestation at Paris' Tuileries Garden

AFP (July 29, 2014) An infestation of rats is causing concern among tourists at Paris' most famous park -- the Tuileries garden next to the Louvre Museum. Duration: 00:54 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins