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.

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 July 25, 2014 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 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
Dogs Appear To Become Jealous Of Owners' Attention

Dogs Appear To Become Jealous Of Owners' Attention

Newsy (July 23, 2014) A U.C. San Diego researcher says jealousy isn't just a human trait, and dogs aren't the best at sharing the attention of humans with other dogs. Video provided by Newsy
Powered by NewsLook.com
Professor Creates Site Revealing Where People's Cats Live

Professor Creates Site Revealing Where People's Cats Live

Newsy (July 23, 2014) ​It's called I Know Where Your Cat Lives, and you can keep hitting the "Random Cat" button to find more real cats all over the world. Video provided by Newsy
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
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