Featured Research

from universities, journals, and other organizations

Heritable variation discovered in trout behavior

Date:
March 13, 2014
Source:
University of Eastern Finland
Summary:
Populations of endangered salmonids are supported by releasing large quantities of hatchery-reared fish, but the fisheries' catches have continued to decrease. Earlier research has shown that certain behavioural traits explain individual differences in how fish survive in the wild. A new Finnish study conducted on brown trout now shows that there are predictable individual differences in behavioural traits, like activity, tendency to explore new surroundings and stress tolerance. Furthermore, certain individual differences were observed to contain heritable components.

Researchers at the University of Eastern Finland, the Finnish Game and Fisheries Research Institute and MTT Agrifood Research Finland studied the consistency and heritability of key behavioural traits in brown trout by comparing half-sibling fish of known parentage. The study was carried out in the Finnish Game and Fisheries Institute's Kainuu Fisheries Research Station in Paltamo.

The research group discovered that the behavioural traits examined were individually repeatable, i.e., fish showed personality. Furthermore, certain behaviours related to stress tolerance, such as freezing, showed statistical heritability at a level of 14%. This means that non-random mortality related to stress tolerance both in fish farms and in the wild can modify the heritable traits of fish populations and thus lead to changes that are difficult to reverse. At worst, these changes might weaken the ability of fish to avoid predators and decrease the fisheries' catches unless mitigated by acknowledging the potential selection acting on fish personality.

The article is currently in press in Behavioral Ecology and Sociology.

Populations of endangered salmonids are supported by releasing large quantities of hatchery-reared fish, but the fisheries' catches have continued to decrease. Earlier research has shown that certain behavioural traits explain individual differences in how fish survive in the wild. A new Finnish study conducted on brown trout now shows that there are predictable individual differences in behavioural traits, like activity, tendency to explore new surroundings and stress tolerance. Furthermore, certain individual differences were observed to contain heritable components.

Related Articles


Researchers at the University of Eastern Finland, the Finnish Game and Fisheries Research Institute and MTT Agrifood Research Finland studied the consistency and heritability of key behavioural traits in brown trout by comparing half-sibling fish of known parentage. The study was carried out in the Finnish Game and Fisheries Institute's Kainuu Fisheries Research Station in Paltamo.

The research group discovered that the behavioural traits examined were individually repeatable, i.e., fish showed personality. Furthermore, certain behaviours related to stress tolerance, such as freezing, showed statistical heritability at a level of 14%. This means that non-random mortality related to stress tolerance both in fish farms and in the wild can modify the heritable traits of fish populations and thus lead to changes that are difficult to reverse. At worst, these changes might weaken the ability of fish to avoid predators and decrease the fisheries' catches unless mitigated by acknowledging the potential selection acting on fish personality.


Story Source:

The above story is based on materials provided by University of Eastern Finland. Note: Materials may be edited for content and length.


Journal Reference:

  1. Kortet, R., Vainikka, A., Janhunen, M., Piironen, J. and Hyvδrinen, P. Behavioral variation shows heritability in juvenile brown trout Salmo trutta. Behavioral Ecology and Sociobiology, 2014 (in press)

Cite This Page:

University of Eastern Finland. "Heritable variation discovered in trout behavior." ScienceDaily. ScienceDaily, 13 March 2014. <www.sciencedaily.com/releases/2014/03/140313092219.htm>.
University of Eastern Finland. (2014, March 13). Heritable variation discovered in trout behavior. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/2014/03/140313092219.htm
University of Eastern Finland. "Heritable variation discovered in trout behavior." ScienceDaily. www.sciencedaily.com/releases/2014/03/140313092219.htm (accessed December 22, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Monday, December 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Christmas Kissing Good for Health

Christmas Kissing Good for Health

Reuters - Innovations Video Online (Dec. 22, 2014) — Scientists in Amsterdam say couples transfer tens of millions of microbes when they kiss, encouraging healthy exposure to bacteria. Suzannah Butcher reports. Video provided by Reuters
Powered by NewsLook.com
Brain-Dwelling Tapeworm Reveals Genetic Secrets

Brain-Dwelling Tapeworm Reveals Genetic Secrets

Reuters - Innovations Video Online (Dec. 22, 2014) — Cambridge scientists have unravelled the genetic code of a rare tapeworm that lived inside a patient's brain for at least four year. Researchers hope it will present new opportunities to diagnose and treat this invasive parasite. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
New Fish Species Discovered, Setting Record for World's Deepest

New Fish Species Discovered, Setting Record for World's Deepest

Buzz60 (Dec. 22, 2014) — A new species of fish is discovered living five miles beneath the ocean surface, making it the deepest living fish on earth. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Earthworms Provide Cancer-Fighting Bacteria

Earthworms Provide Cancer-Fighting Bacteria

Reuters - Innovations Video Online (Dec. 21, 2014) — Polish scientists isolate bacteria from earthworm intestines which they say may be used in antibiotics and cancer treatments. Suzannah Butcher reports. Video provided by Reuters
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