Navigation Links
Commercial fishing causes dangerous fluctuations in fish populations

Commercial fishing causes serious fluctuations in fish populations leaving them in danger of total collapse, says new research published today. These fluctuations mean current measures in place to control fish stocks may not be sufficient to ensure their sustainability.

The research, which is published in today's Nature, involved compiling the largest ever survey of both exploited fish and non-exploited fish off the California coast. The research team looked at how the abundance of both types of fish varied over a 50 year period, and found the first evidence that exploited species' population levels vary far more than non exploited species' in the same ecosystem.

Researchers concluded that this increased variability in exploited fish stocks was most likely to be caused by the effect fishing has on the age structure of a population. Heavily-fished populations are unlikely to contain any fish older than a few years old, and as such are wholly reliant on the successful growth of larvae into baby fish (recruits) to maintain population numbers year on year.

Professor John Beddington from Imperial College London's Division of Biology, who worked on the study, explained: "Intensive fishing makes populations vulnerable because if they rely on recruits to replenish their numbers, there is always the danger that some kind of environmental factor will devastate the recruits in one season. This would leave the population close to collapse, with very few young fish coming into the group to replace those being caught."

Professor Beddington adds that the increased variability has serious implications for the way in which fish stocks are managed: "Typically fish populations are managed by governments setting total allowable catch limits (TACs), but a fixed TAC which doesn't take into account the variability of abundance over time, may mean that in some years it is completely incompatible with the population size. This means that fishing vessels could unwittingly overexploit the population, even though they are abiding by set limits."

Researchers hope that their findings will mean future decisions about fishery management take into account the variations caused by fishing, to safeguard the future of key fish populations.

Source:Imperial College London

Related biology news :

1. Agilent Technologies Introduces First Commercial Mouse Microarray for Comparative Genomic Hybridization Research
2. Overfishing may drive endangered seabird to rely upon lower quality food
3. Overfishing in inland waters reduces biodiversity and threatens health
4. Hooked on fishing, and were heading for the bottom, says scientist
5. UN review shows need to halt destructive fishing practice
6. Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply
7. Long-lived deep-sea fishes imperiled by technology, overfishing
8. BRCA1 causes ovarian cancer through indirect, biochemical route
9. Researchers discover molecule that causes secondary stroke
10. NASA study finds snow melt causes large ocean plant blooms
11. Alarm pheromone causes aphids to sprout wings

Post Your Comments:

(Date:4/14/2016)... 2016 BioCatch ™, the ... announced the appointment of Eyal Goldwerger as ... Goldwerger,s leadership appointment comes at a time of ... deployment of its platform at several of the world,s ... discerns unique cognitive and physiological factors, is a winner ...
(Date:3/31/2016)... , March 31, 2016   ... ("LegacyXChange" or the "Company") LegacyXChange is excited ... of its soon to be launched online site for ... ) will also provide potential shareholders a ... DNA technology to an industry that is notorious for ...
(Date:3/29/2016)... , March 29, 2016 ... "Company") LegacyXChange "LEGX" and SelectaDNA/CSI Protect are pleased to ... ink used in a variety of writing instruments, ensuring ... of originally created collectibles from athletes on LegacyXChange will ... analysis of the DNA. Bill Bollander ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... ... June 24, 2016 , ... Researchers at the Universita Politecnica ... in people with peritoneal or pleural mesothelioma. Their findings are the subject of a ... , Diagnostic biomarkers are signposts in the blood, lung fluid or tissue of ...
(Date:6/23/2016)... , June 23, 2016 A person commits ... the crime scene to track the criminal down. ... U.S. Food and Drug Administration (FDA) uses DNA evidence to ... Sound far-fetched? It,s not. The FDA has ... to support investigations of foodborne illnesses. Put as simply as ...
(Date:6/23/2016)... , June 23, 2016   EpiBiome , ... secured $1 million in debt financing from Silicon Valley ... up automation and to advance its drug development efforts, ... new facility. "SVB has been an incredible ... the services a traditional bank would provide," said Dr. ...
(Date:6/23/2016)...  Blueprint Bio, a company dedicated to identifying, protecting ... has closed its Series A funding round, according to ... "We have received a commitment from Forentis Fund that ... meet our current goals," stated Matthew Nunez . ... complete validation on the current projects in our pipeline, ...
Breaking Biology Technology: