HOME >> BIOLOGY >> NEWS
Fewer fish eggs, smaller fish result from over-fishing

The practice of harvesting the largest individuals from a fish population introduces genetic changes that harm the overall fish population, a UC Riverside graduate student and colleagues have determined. Removing the large fish over several generations of fish causes the remaining fish in the populations to become progressively smaller, have fewer and smaller eggs with lower survival and growth, and have lower foraging and feeding rates, the researchers report.

"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 Matthew R. Walsh, a graduate student in UCR's Department of Biology, 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.

Focusing on the Atlantic silverside, a commercially exploited fish commonly found along the east coast of North America, the researchers conducted harvesting experiments under a variety of regimens. They reared the fish for five generations, selecting out the largest individuals from each generation. They then evaluated multiple traits, such as body size and the number of eggs, in fish from the fifth generation.

"We found that removing the large fish in each generation, as in most fisheries, caused declines in many traits spanning the life history, physiology and behavior of this marine fish," said Walsh, the first author of the paper. "We know that commercially exploited populations of fish often are slow to recover when fishing pressure is reduced. Our research indicates that the over-harvested fish stocks are slow to rebound because fishing selects for evolutionary changes in the life history of the fish. As a result, to effectively manage exploited fisheries, the impacts of these genetic changes must be considered and accounted for. Because the changes in
'"/>

Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
19-Jan-2006


Page: 1 2

Related biology news :

1. Fewer wrinkles and firmer skin linked to earlier use of estrogen therapy
2. Fewer fish discarded after individual transferable quotas offered
3. Fewer calories may slow Alzheimers
4. Studies to find better ways to preserve human eggs, ovarian tissue under way
5. Technique may allow cancer patients to freeze eggs, preserving fertility before starting treatment
6. Is nutrient loading a smaller problem than we think?
7. Enzyme delivered in smaller package protects cells from radiation damage
8. Small, smaller, smallest -- The plight of the vaquita
9. Adolescents and young adults with alcohol-use disorders have a smaller prefrontal cortex
10. New chemistry method uses test tubes far smaller than the width of a hair
11. Study: Donated embryos could result in more than 2,000 new embryonic stem cell lines

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Fewer fish eggs smaller fish result from over fishing

(Date:10/18/2014)... for evaluation of suspected genetic conditions, whole-exome sequencing ... including detection of a number of rare genetic ... to a study appearing in JAMA . ... the American Society of Human Genetics annual meeting. ... regions of thousands of genes simultaneously using next-generation ...
(Date:10/17/2014)... available in German . ... few drugs. When treating overdoses, doctors are often limited to ... if there is a combination of drugs involved. So what ... swallows his grandmother,s pills? ETH professor Jean-Christophe Leroux from the ... an answer to this question. "The task was to develop ...
(Date:10/16/2014)... can be cultivated efficiently, they are anything but ... by monoculture cultivation is becoming increasingly evident. Despite ... form and are regarded as the sole possibility ... quite wrongfully, finds Bernhard Schmid, an ecology professor ... novel form of agriculture and forestry. After all, ...
Breaking Biology News(10 mins):Whole-exome sequencing shows potential as diagnostic tool 2Emergency aid for overdoses 2Emergency aid for overdoses 3Plant communities produce greater yield than monocultures 2Plant communities produce greater yield than monocultures 3
(Date:10/20/2014)... , A major pan-European survey into the ... care has revealed changing trends in many important GI ... of healthcare services across the continent. The results of ... (UEG), have been announced today and led to calls ... of GI disorders across Europe ...
(Date:10/20/2014)... 2014 Earle Martin , ... today that Ellen Teplitzky, an experienced attorney specializing ... pharmaceutical industry, has joined the firm as Director ... services practice. NDA Partners provides legal services, ... testimony, to top law firms and their clients ...
(Date:10/19/2014)... Oct. 19, 2014 NextCODE Health, which enables clinicians ... in real time, today announced the launch of its new ... , at the American Society of Human Genetics (ASHG) annual ... more, sign up and apply for free beta access, visit ... and benefits can be viewed here . ...
(Date:10/19/2014)... 19, 2014 The report "Chocolate, Cocoa ... Trade, Prices, Geography Trend and Forecast (2011 - 2016)," ... and geography and studies the major market drivers, restraints, ... Europe, and Asia. , The global chocolate market is ... billion in 2016 at an estimated CAGR of 2.7% ...
Breaking Biology Technology:Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 2Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 3Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 4Major Survey Reveals Changing Trends and Inequalities in Healthcare Provision for Gastrointestinal Disorders Across Europe 5NDA Partners Appoints Ellen Teplitzky, JD as Director of its Legal Services Practice 2The NextCODE Exchange: The first global, real-time system for sharing full-resolution genomic data 2The NextCODE Exchange: The first global, real-time system for sharing full-resolution genomic data 3Chocolate Market Projected To Reach $98.3 Billion by 2016 - New Report by MarketsandMarkets 2Chocolate Market Projected To Reach $98.3 Billion by 2016 - New Report by MarketsandMarkets 3Chocolate Market Projected To Reach $98.3 Billion by 2016 - New Report by MarketsandMarkets 4
Cached News: