Featured Research

from universities, journals, and other organizations

Sterile salmon – reducing environmental impact of farm escapees

Date:
December 12, 2013
Source:
Norwegian School of Veterinary Science
Summary:
A PhD project has investigated the use of sterile salmon in aquaculture as a means to prevent escaped farmed salmon interbreeding with wild salmon. The study used a method known as triploidy to induce sterility in Atlantic salmon. The results suggest that in order to successfully integrate triploid salmon into the industry, some modifications are required to the current protocols used today to prevent heart and skeletal deformities.

Thomas Fraser’s thesis is a study of the potential use of triploid salmon in Norwegian aquaculture in relation to culture practices and heart and skeletal deformities. The main finding of the thesis is that using current culture practices triploids do have higher levels of skeletal deformities than diploids.
Credit: Norwegian School of Veterinary Science

A PhD project carried out at the Norwegian School of Veterinary Science in collaboration with the Institute of Marine Research has investigated the use of sterile salmon in aquaculture as a means to prevent escaped farmed salmon interbreeding with wild salmon. The study used a method known as triploidy to induce sterility in Atlantic salmon. The results suggest that in order to successfully integrate triploid salmon into the industry, some modifications are required to the current protocols used today to prevent heart and skeletal deformities.

Salmon farming is a major industry in Norway. However, environmental concerns remain over the industries impact on wild salmon populations. Hundreds of thousands of farmed salmon are reported to escape in Norway each year and these fish can breed with wild fish creating hybrids that are less adapted for life in the wild. The use of sterile fish would prevent this situation. Triploidy, whereby the individual retains the genetic material using discarded during fertilisation, is the most feasible method to produce commercially available sterile fish. Indeed, triploids are currently used in global shellfish production and salmon production in France and Australia. However, previous work has shown triploids to have more skeletal deformities and lower temperature optima than the diploid salmon currently used in Norwegian aquaculture.

Thomas Fraser's thesis is a study of the potential use of triploid salmon in Norwegian aquaculture in relation to culture practices and heart and skeletal deformities. The main finding of the thesis is that using current culture practices triploids do have higher levels of skeletal deformities than diploids. This difference is greater when the salmon are incubated at the higher ranges of temperatures used in the industry. In addition, triploids had a higher prevalence of heart deformities when incubated at the higher temperatures. Triploids also demonstrated a greater adverse effect to vaccination than diploids when vaccinated at high water temperatures, as would occur if fish were vaccinated during the summer/early autumn months. Therefore, special consideration with respect to water temperature is required in the production of triploid salmon.

In summary, sterile triploid salmon show potential for use in the Norwegian salmon farming industry although they are likely to require alterations in culture practices to achieve their greatest potential.


Story Source:

The above story is based on materials provided by Norwegian School of Veterinary Science. Note: Materials may be edited for content and length.


Cite This Page:

Norwegian School of Veterinary Science. "Sterile salmon – reducing environmental impact of farm escapees." ScienceDaily. ScienceDaily, 12 December 2013. <www.sciencedaily.com/releases/2013/12/131212095818.htm>.
Norwegian School of Veterinary Science. (2013, December 12). Sterile salmon – reducing environmental impact of farm escapees. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2013/12/131212095818.htm
Norwegian School of Veterinary Science. "Sterile salmon – reducing environmental impact of farm escapees." ScienceDaily. www.sciencedaily.com/releases/2013/12/131212095818.htm (accessed September 17, 2014).

Share This



More Plants & Animals News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chimp Violence Study Renews Debate On Why They Kill

Chimp Violence Study Renews Debate On Why They Kill

Newsy (Sep. 17, 2014) The study weighs in on a debate over whether chimps are naturally violent or become that way due to human interference in the environment. Video provided by Newsy
Powered by NewsLook.com
Some Tobacco Farmers Thrive Amid Challenges

Some Tobacco Farmers Thrive Amid Challenges

AP (Sep. 16, 2014) The South's tobacco country is surviving, and even thriving in some cases, as demand overseas keeps growers in the fields of one of America's oldest cash crops. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

AFP (Sep. 16, 2014) Scientists say a female colossal squid weighing an estimated 350 kilograms (770 lbs) and thought to be only the second intact specimen ever found was carrying eggs when discovered in the Antarctic. Duration: 00:47 Video provided by AFP
Powered by NewsLook.com
Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
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