Featured Research

from universities, journals, and other organizations

Fish migrate to escape predators

Date:
March 1, 2013
Source:
Technical University of Denmark (DTU)
Summary:
By individually tagging fish in a lake and following their movements, a research teamhas shown that migration is a very effective defense against being eaten.

Antennas that detect pittagged fish migrating between lake and stream.
Credit: Jes Dolby

By individually tagging fish in a lake and following their movements, a research team has shown that migration is a very effective defence against being eaten.

Related Articles


Each year billions of animals make annual migrations to escape adverse environmental conditions. Migration is a spectacular and important biological phenomenon, but studying what drives animals to make these arduous journeys is extremely difficult. Food and climate are classic explanations for animal migration, but the idea that animals migrate to escape predators is less well studied. Senior scientist Christian Skov, DTU Aqua and colleagues from Lund Universitiy, Sweden and Eawag, Switzerland now present direct evidence that migrants benefit by evading predators.

The biologists tagged more than 2000 individual fish (roach, Rutilus rutilus) in two Danish lakes over 4 years and monitored migratory behaviour using passive telemetry. Next, they calculated the predation vulnerability of fish with differing migration strategies, by recovering data from passive integrated transponder tags of fish eaten by cormorants (Phalacrocorax carbo spp.) at communal roosts close to the lakes. The results are published in Biology Letters.

The extensive field study shows that migration in a freshwater fish like roach that commonly migrates from lakes to streams during winter, confers a significant survival benefit with respect to cormorant, predation.

Our study show that fish can reduce their predation risk from cormorants by migrating into streams, and that the probability of being preyed upon by cormorants is positively related to the time individuals spend in the lake during winter," says lead author, senior research scientist Christian Skov, DTU Aqua, National Institute of Aquatic Resources, Denmark:

"Our data add to the growing body of evidence that highlights the importance of predation for migratory dynamics, and is one of the first studies to directly quantify a predator avoidance benefit to migrants in the field."

The research was financially supported by the Danish National Fishing Licence Funds, Formas, Swedish Research Council and a Marie Curie EU fellowship (FP7).


Story Source:

The above story is based on materials provided by Technical University of Denmark (DTU). Note: Materials may be edited for content and length.


Journal Reference:

  1. C. Skov, B. B. Chapman, H. Baktoft, J. Brodersen, C. Bronmark, L.-A. Hansson, K. Hulthen, P. A. Nilsson. Migration confers survival benefits against avian predators for partially migratory freshwater fish. Biology Letters, 2013; 9 (2): 20121178 DOI: 10.1098/rsbl.2012.1178

Cite This Page:

Technical University of Denmark (DTU). "Fish migrate to escape predators." ScienceDaily. ScienceDaily, 1 March 2013. <www.sciencedaily.com/releases/2013/03/130301034605.htm>.
Technical University of Denmark (DTU). (2013, March 1). Fish migrate to escape predators. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/2013/03/130301034605.htm
Technical University of Denmark (DTU). "Fish migrate to escape predators." ScienceDaily. www.sciencedaily.com/releases/2013/03/130301034605.htm (accessed January 29, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, January 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dogs Bring on So Many Different Emotions in Their Human Best Friends

Dogs Bring on So Many Different Emotions in Their Human Best Friends

RightThisMinute (Jan. 28, 2015) From new-puppy happy tears to helpful-grocery-carrying-dog laughter, our four-legged best friends can make us feel the entire spectrum of emotions. Video provided by RightThisMinute
Powered by NewsLook.com
Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Newsy (Jan. 28, 2015) Wrongly categorized as lizard fossils, snake fossils now show the reptile could have developed earlier than we thought — 70 million years earlier. Video provided by Newsy
Powered by NewsLook.com
Malnutrition on the Rise as Violence Flares in C. Africa

Malnutrition on the Rise as Violence Flares in C. Africa

AFP (Jan. 28, 2015) Violence can flare up at any moment in Bambari with only a bridge separating Muslims and Christians. Malnutrition is on the rise and lack of water means simple cooking fires threaten to destroy makeshift camps where people are living. Duration: 00:40 Video provided by AFP
Powered by NewsLook.com
Poultry Culled in Taiwan to Thwart Bird Flu

Poultry Culled in Taiwan to Thwart Bird Flu

Reuters - News Video Online (Jan. 28, 2015) Taiwan culls over a million poultry in efforts to halt various strains of avian flu. Julie Noce 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:

More Coverage


Fish Migrate to Safer Environments

Mar. 1, 2013 Research now reveals that fish can migrate to avoid the threat of being eaten. A new study shows that roach fish leave lakes and move into surrounding streams or wetlands, where they are safer from ... read more

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