Over-fishing: Fewer eggs, smaller fish

Jan 19, 2006

A University of California-Riverside study suggests harvesting the largest individuals from a fish population introduces harmful genetic changes.

Graduate biology student Matthew Walsh and colleagues found removing the biggest fish over several generations causes the remaining fish to become progressively smaller, have fewer and smaller eggs with lower survival and growth, and have lower foraging and feeding rates.

"We have shown for the first time that many traits correlated with fish body-size may be evolving in response to intense fishing pressure," said Walsh, who led the research project. "Our experiment is the only one to simulate the evolutionary impacts of harvesting in a laboratory setting."

Study results will appear in the February issue of Ecology Letters.

Copyright 2006 by United Press International

Explore further: LEGO bricks build better mathematicians

add to favorites email to friend print save as pdf

Related Stories

New largest number factored on a quantum device is 56,153

19 minutes ago

(Phys.org)—Researchers have set a new record for the quantum factorization of the largest number to date, 56,153, smashing the previous record of 143 that was set in 2012. They have shown that the exact same room-t ...

Recommended for you

Pop music heritage contributes to the formation of identity

5 hours ago

The musical rebels of the past are today's museum pieces. Pop music is increasingly penetrating heritage institutions such as museums and archives. That is apparent from the PhD research of Arno van der Hoeven. On Thursday ...

Helping older employees stay in their jobs

5 hours ago

Factors that can hinder older employees from continuing to work include workload, a poor memory and the pensionable age-effect. The Job-Exposure Matrix is a newly developed instrument that provides an easy way to chart the ...

Explainer: What is a small private online course?

7 hours ago

If you have studied an online course at a university over the past couple of decades, you've probably already experienced a SPOC, or Small Private Online Course. SPOC is a new term for an old concept, which appears to be frustrating members of the distance edu ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.