Featured Research

from universities, journals, and other organizations

New insight into physiology of salmon's intestines

Date:
December 3, 2013
Source:
Norwegian School of Veterinary Science
Summary:
A PhD research project has provided essential knowledge about the mechanisms leading to feed-induced enteritis in salmon and also insight into the salmon's intestinal immune defense system. This research provides a good foundation for developing new types of salmon feed, which must be based on new ingredients.

A PhD research project at the Norwegian School of Veterinary Science has provided essential knowledge about the mechanisms leading to feed-induced enteritis in salmon and also insight into the salmon's intestinal immune defense system. This research provides a good foundation for developing new types of salmon feed, which must be based on new ingredients.

Norwegian salmon farming has experienced an extremely high growth rate since its small beginnings in 1970 and the industry seems to be still growing. Fundamental and targeted research has always been an important prerequisite for this growth. Nevertheless, we still do not know enough about a number of fundamental, biological factors that are essential for achieving continued growth in the industry and for safeguarding fish welfare. One example is a lack of basic understanding about the physiology of the salmon's digestive system in the early stages of life. Furthermore, we know little about the long-term consequences for the development and health of salmon when feed based on marine ingredients is replaced by alternative feed sources -- an issue that profoundly affects future growth in the industry.

For the first time, Christian Sahlmann's doctoral thesis describes in detail the development and functions of salmon fry's gastrointestinal tract. Sahlmann's findings indicate that salmon is capable of digesting feed and absorbing nutrients approximately one week before the yolk sac is absorbed. It may therefore be appropriate to consider whether the feeding of salmon in hatcheries should start a week earlier than is commonly the practice today. Sahlmann's findings provide a starting point for further research into how to give the fish the best possible start in life.

The increased use of plant materials results in many cases to less growth and presents a hazard to the digestive health of many fish species, including salmon. Salmon living in seawater and given feed containing soy and certain other pulses, such as peas, develop a serious inflammation of the distal (posterior) intestine. Sahlmann found that during the first months of life, salmon do not suffer from inflammations of this kind. This indicates that the immune defence system in the intestines of salmon fry is less sensitive and therefore more able to tolerate variations in the composition of feed than during later life. This discovery provides a new premise for developing feed which will ensure optimal growth and welfare in salmon when feeding commences and perhaps also later in life.

The digestive system of smolt can react very rapidly to changes in feed Sahlmann's studies are the first to show how the distal intestine in salmon at the smolt stage is affected in the earliest stages following a change in feed from one based on fishmeal to one containing a large proportion of soybean meal. Only 24 hours after such a change in feed, changes could be seen in both gene expression and protein expression and on a functional level. This research presents us with fundamental knowledge about the mechanisms leading to feed-induced inflammation in salmon in particular, and increased insight into the intestinal immune defence system in general. Further, it provides a stronger platform for developing types of feed which must be based on new ingredients and points out relevant indicators for good intestinal health.


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. "New insight into physiology of salmon's intestines." ScienceDaily. ScienceDaily, 3 December 2013. <www.sciencedaily.com/releases/2013/12/131203090706.htm>.
Norwegian School of Veterinary Science. (2013, December 3). New insight into physiology of salmon's intestines. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2013/12/131203090706.htm
Norwegian School of Veterinary Science. "New insight into physiology of salmon's intestines." ScienceDaily. www.sciencedaily.com/releases/2013/12/131203090706.htm (accessed July 25, 2014).

Share This




More Plants & Animals News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Boy Attacked by Shark in Florida

Boy Attacked by Shark in Florida

Reuters - US Online Video (July 24, 2014) An 8-year-old boy is bitten in the leg by a shark while vacationing at a Florida beach. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Goma Cheese Brings Whiff of New Hope to DRC

Goma Cheese Brings Whiff of New Hope to DRC

Reuters - Business Video Online (July 24, 2014) The eastern region of the Democratic Republic of Congo, mainly known for conflict and instability, is an unlikely place for the production of fine cheese. But a farm in the village of Masisi, in North Kivu is slowly transforming perceptions of the area. Known simply as Goma cheese, the Congolese version of Dutch gouda has gained popularity through out the region. Ciara Sutton reports. Video provided by Reuters
Powered by NewsLook.com
Tyrannosaur Pack-Hunting Theory Aided By New Footprints

Tyrannosaur Pack-Hunting Theory Aided By New Footprints

Newsy (July 24, 2014) A new study claims a set of prehistoric T-Rex footprints supports the theory that the giant predators hunted in packs instead of alone. Video provided by Newsy
Powered by NewsLook.com
Bill Gates: Health, Agriculture Key to Africa's Development

Bill Gates: Health, Agriculture Key to Africa's Development

AFP (July 24, 2014) Health and agriculture development are key if African countries are to overcome poverty and grow, US software billionaire Bill Gates said Thursday, as he received an honourary degree in Ethiopia. Duration: 00:36 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