Featured Research

from universities, journals, and other organizations

Next-generation echo sounder ready

Date:
November 8, 2012
Source:
The Research Council of Norway
Summary:
Echo sounders are used to find fish in the ocean, observe their behavior, and estimate their quantity and size as well as the abundance and distribution of the plankton upon which fish feed. Research vessels and many fishing vessels typically use echo sounders that send and receive signals on up to six frequencies. Norwegian researchers have now developed an echo sounder that works on 100 frequencies simultaneously.

Testing of the echo sounder and stereo camera.
Credit: WESTZOO/Havforskningsinstituttet 2012

Echo sounders are used to find fish in the ocean, observe their behaviour, and estimate their quantity and size as well as the abundance and distribution of the plankton upon which fish feed.

Research vessels and many fishing vessels typically use echo sounders that send and receive signals on up to six frequencies. Norwegian researchers have now developed an echo sounder that works on 100 frequencies simultaneously.

Quantum leap in fisheries acoustics

Currently, multiple echo sounders working in parallel on different frequencies are needed in order to identify marine organisms below the surface. A specific target -- a school of mackerel, for instance -- can be singled out by analysing all the elements within the echo sounder image (called an echogram) and removing the echoes from other species such as herring, cod and plankton. This creates an echogram showing only the seabed and the mackerel.

"Our new wideband echo sounder sends signals on all its frequencies at once, which is equivalent to 100 echo sounders operating on one frequency each," explains Principal Scientist Egil Ona of the Institute of Marine Research in Bergen. "This makes it so much better at identifying fish and zooplankton, we consider it a quantum leap in fisheries acoustics."

Dr Ona heads the project "Exploiting new wideband echo sounder technology for zooplankton characterization, sizing and abundance estimation (WESTZOO)," which has received funding from the Research Council of Norway's research programme on the Oceans and Coastal Areas (HAVKYST).

Much higher resolution

Initially, the project researchers focused on zooplankton, since the echo from these marine organisms was so well suited to the available frequency band. Later, they tried out the wideband echo sounder on fish and other targets.

"The experimental results are extremely promising," says Dr Ona. "The new system provides much better information about the target. In addition, the echograms are of far higher resolution, enabling us to identify various species more accurately than before."

"The potential of this new echo sounder far exceeds current systems, " says Dr Ona. The new product will hit the market in 2013, commercialised by the technology company Simrad, a part of Kongsberg Maritime AS. Simrad is a partner in the WESTZOO project.

Images from the deep

The WESTZOO project has yielded exciting results in addition to the new echo sounder technology. For instance, the researchers have developed a stereo camera method for photographing the organisms being measured in ocean depths. The photos are used to verify the patterns and other data detected by the echo sounder.

The researchers have also constructed an acoustic probe that can quantify and distinguish fish and plankton down to depths of 1 500 metres. "We are confident," says Egil Ona, "that this will become a standard tool on a lot of research vessels in the future."


Story Source:

The above story is based on materials provided by The Research Council of Norway. The original article was written by Sven ุvergaard/Elisabeth Skj๘nsberg; translation by Darren McKellep/Carol B. Eckmann. Note: Materials may be edited for content and length.


Cite This Page:

The Research Council of Norway. "Next-generation echo sounder ready." ScienceDaily. ScienceDaily, 8 November 2012. <www.sciencedaily.com/releases/2012/11/121108073807.htm>.
The Research Council of Norway. (2012, November 8). Next-generation echo sounder ready. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2012/11/121108073807.htm
The Research Council of Norway. "Next-generation echo sounder ready." ScienceDaily. www.sciencedaily.com/releases/2012/11/121108073807.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

Raw: Otters Enjoy Water Slides at Japan Zoo

Raw: Otters Enjoy Water Slides at Japan Zoo

AP (July 30, 2014) — River otters were hitting the water slides to beat the summer heatwave on Wednesday at Ichikawa City's Zoological and Botanical Garden. (July 30) Video provided by AP
Powered by NewsLook.com
In Virginia, the Rise of a New Space Coast

In Virginia, the Rise of a New Space Coast

AP (July 30, 2014) — Every summer, tourists make the pilgrimage to Chincoteague Island, Va. to see wild ponies cross the Assateague Channel. But, it's the rockets sending to supplies to the International Space Station that are making this a year-round destination. (July 30) Video provided by AP
Powered by NewsLook.com
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

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