Featured Research

from universities, journals, and other organizations

Toxins produced by algae lead to deviant behaviour and changes in brain activity in salmon

Date:
June 25, 2012
Source:
Norwegian School of Veterinary Science
Summary:
Salmon exposed to algal-produced neurotoxins show changes in both their brain activity and general behavior. It has also been found that very small doses of these toxins can have an affect on how salmon relate to other fish. These toxins are some of those that can cause food poisoning in people who eat contaminated mussels.

Salmon exposed to algal-produced neurotoxins show changes in both their brain activity and general behaviour.
Credit: Image courtesy of Norwegian School of Veterinary Science

Salmon exposed to algal-produced neurotoxins show changes in both their brain activity and general behaviour. It has also been found that very small doses of these toxins can have an affect on how salmon relate to other fish. These toxins are some of those that can cause food poisoning in people who eat contaminated mussels.

Marit Bakke has studied three different neurotoxins: saxitoxin, brevetoxin and domoic acid and the effects that relatively low doses of these contaminants have on salmon. She has described some characteristic features of salmon's general behaviour and how it changes under the influence of these toxins, such as loss of balance and equilibrium and swimming aimlessly. In addition, she examined the glucose metabolism in the brain by means of radioactively treated glucose as a marker. The degree of marker accumulation corresponded to the neuroactivity in the areas of the brain being studied, and in this way, Bakke demonstrated that different parts of the brain undergo changes when influenced by these toxins.

Saxitoxin and domoic acid were administered in such low doses that it was not possible to detect changes in swimming patterns. Nevertheless, Bakke was able to prove that the toxins had an effect on how the fish related to new fish that were released into the aquarium. This would indicate that fish exposed to even small concentrations of algal toxins may therefore tackle new situations in a different way to fish which have never been exposed to such toxins.

Marine algal toxins are often the cause of food poisoning in humans who have eaten shellfish. But such toxins also affect animals living in the sea, either via direct absorption from the water or because the food they eat is contaminated. In the case of farmed fish, the consequences can be serious because they cannot escape from areas contaminated with algae and algal toxins. It is often difficult to detect cases where fish are exposed to very low doses of algal toxins or their potential consequences. Bakke's doctoral research demonstrates several possible ways of detecting algal toxins, even in low concentrations.

Bakke carried out her doctoral project at the Norwegian School of Veterinary Science and at the Norwegian Institute for Water Research's research station by the Oslo Fjord at Solbergstrand near Drøbak.


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. "Toxins produced by algae lead to deviant behaviour and changes in brain activity in salmon." ScienceDaily. ScienceDaily, 25 June 2012. <www.sciencedaily.com/releases/2012/06/120625064450.htm>.
Norwegian School of Veterinary Science. (2012, June 25). Toxins produced by algae lead to deviant behaviour and changes in brain activity in salmon. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2012/06/120625064450.htm
Norwegian School of Veterinary Science. "Toxins produced by algae lead to deviant behaviour and changes in brain activity in salmon." ScienceDaily. www.sciencedaily.com/releases/2012/06/120625064450.htm (accessed October 22, 2014).

Share This



More Plants & Animals News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Working Mother DIY: Pumpkin Pom-Pom

Working Mother DIY: Pumpkin Pom-Pom

Working Mother (Oct. 22, 2014) — How to make a pumpkin pom-pom. Video provided by Working Mother
Powered by NewsLook.com
San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

Reuters - Light News Video Online (Oct. 22, 2014) — The pair of rare white northern rhinos bring hope for their species as only six remain in the world. Elly Park reports. Video provided by Reuters
Powered by NewsLook.com
Raw: Bear Cub Strolls Through Oregon Drug Store

Raw: Bear Cub Strolls Through Oregon Drug Store

AP (Oct. 22, 2014) — Shoppers at an Oregon drug store were surprised by a bear cub scurrying down the aisles this past weekend. (Oct. 22) Video provided by AP
Powered by NewsLook.com
Family Pleads for Pet Pig to Stay at Home

Family Pleads for Pet Pig to Stay at Home

AP (Oct. 22, 2014) — The Johnson family lost their battle with the Chesterfield County, Virginia Planning Commission to allow Tucker, their pet pig, to stay in their home, but refuse to let the board keep Tucker away. (Oct. 22) 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:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

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