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:
*Name:
*Comment:
*Email:


(Date:4/11/2017)... Fla. , April 11, 2017 ... and secure authentication solutions, today announced that it ... Intelligence Advanced Research Projects Activity (IARPA) to develop ... Thor program. "Innovation has been a ... IARPA,s Thor program will allow us to innovate ...
(Date:4/11/2017)... 11, 2017 No two people are ... the New York University Tandon School of Engineering ... found that partial similarities between prints are common ... mobile phones and other electronic devices can be ... vulnerability lies in the fact that fingerprint-based authentication ...
(Date:4/6/2017)... Forecasts by Product Type (EAC), ... End-Use (Transportation & Logistics, Government & Public Sector, Utilities ... Generation Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), ... you looking for a definitive report on the $27.9bn ... ...
Breaking Biology News(10 mins):
(Date:7/17/2017)... ... July 17, 2017 , ... OHAUS ... announced the launch of its new line of Heavy-Duty Orbital Shakers today. , ... analog and digital) for laboratory applications. These shakers are ideal for load ...
(Date:7/17/2017)... Lake City, Utah (PRWEB) , ... July 17, ... ... “Company”), a molecular diagnostics company that has developed and intends both to manufacture ... and started trading on the NASDAQ Capital Market. , Headquartered in Sandy, Utah, ...
(Date:7/16/2017)... ... July 16, 2017 , ... OHAUS ... announced the launch of its new line of Extreme Environment Shakers today. , ... require CO2 and humidity for optimal cell growth such as cell cultures, solubility ...
(Date:7/14/2017)... ... July 13, 2017 , ... Dr. Joshua Mondlick has introduced the LANAP® ... practice, Mondlick Perio, in the Phoenix area. Dr. Mondlick is at the ... FDA cleared laser treatment to re-grow bone and with significantly less pain than traditional ...
Breaking Biology Technology: