Navigation Links
The same number of fishermen, but less salmon in Spanish rivers
Date:8/26/2011

"It's not that the salmon are biting less, there are less of them," explained Eva Garca Vzquez, lead author and Functional Biology researcher at the University of Oviedo (Spain).

The study, published in Transactions of the American Fisheries Society, shows a "very marked" decline in Atlantic salmon (Salmo salar) populations in the Narcea, Sella and Cares rivers (Asturias, northern Spain), especially during the last decade, almost simultaneously with the reduction in the amount caught by recreational fishermen.

"Given that fishing effort has almost been constant until this year, and that populations have reduced, exploitation of the populations has increased. There's the same amount of fishermen, but less fish," Garca Vzquez stressed.

To reach these conclusions, researchers obtained DNA samples from fish scales and estimated the actual population size (number of salmon that reproduce and contribute to population survival) in Asturian rivers from the 1980s, using different statistical methods, all of which were consistent with one another.

According to the research team, to which the University of Exeter and Westcountry Rivers Trust, Cornwall (both in the UK) collaborated, the increased fishing effort and higher temperatures have affected salmon in northern Spain, southern France and the south of the British Isles. These populations are suffering cyclic fluctuations, and "as a whole" are in recession.

For scientists, the decline in salmon could be due to an increase in recreational fishing licences, which has increased catches. However, the number of fish has decreased because populations have reached their maximum exploitation levels.

Will the salmon return?

The study highlights that the decline in salmon went unnoticed because there are no official estimations to calculate population size in Asturias. Therefore, the experts stress that protection measures should be gradually implemented for these Spanish populations.

"Solutions have been proposed to reduce fishing effort for these populations, which were implemented during the 2011 season in Asturias," notes Garca Vzquez. He added that monitoring and controlling natural populations would allow protective and restorative measures to be adapted according to the state of the populations.


'/>"/>

Contact: SINC
info@agenciasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

Related biology news :

1. High numbers of right whales seen in Gulf of Maine
2. First ever worldwide census analysis of caribou/reindeer numbers reveals dramatic decline
3. New biomarker method could increase the number of diagnostic tests for cancer
4. New stem cell research could reduce number of animal experiments
5. Annual survey shows high numbers of seed scallops on Georges Bank, low numbers in Mid-Atlantic
6. Study of huge numbers of genetic mutations point to oxidative stress as underlying cause
7. River flow and temperature limit trout numbers
8. U of C alumnus finds high numbers of heat-loving bacteria in cold Arctic Ocean
9. UNC study pinpoints gene controlling number of brain cells
10. Europes number 1 scientific network signs off with launch of new report
11. Healthy babies by the numbers
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
The same number of fishermen, but less salmon in Spanish rivers
(Date:5/16/2016)... 16, 2016   EyeLock LLC , a market ... opening of an IoT Center of Excellence in ... the development of embedded iris biometric applications. ... convenience and security with unmatched biometric accuracy, making it ... from DNA. EyeLock,s platform uses video technology to deliver ...
(Date:5/9/2016)... UAE, May 9, 2016 Elevay ... comes to expanding freedom for high net worth professionals ... in today,s globally connected world, there is still no ... could ever duplicate sealing your deal with a firm ... passports by taking advantage of citizenship via investment programs ...
(Date:4/28/2016)... FRANCISCO and BANGALORE, India , ... of EdgeVerve Systems, a product subsidiary of Infosys (NYSE: ... provider, today announced a global partnership that will ... way to use mobile banking and payment services. ... is a key innovation area for financial services, but it ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... June 23, 2016 Houston Methodist Willowbrook ... Cy-Fair Sports Association to serve as their official ... Houston Methodist Willowbrook will provide sponsorship support, athletic ... with association coaches, volunteers, athletes and families. ... Cy-Fair Sports Association and to bring Houston Methodist ...
(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)... 2016 Apellis Pharmaceuticals, Inc. today announced ... of its complement C3 inhibitor, APL-2. The trials ... dose studies designed to assess the safety, tolerability, ... in healthy adult volunteers. Forty subjects ... single dose (ranging from 45 to 1,440mg) or ...
(Date:6/23/2016)... ... June 23, 2016 , ... ClinCapture, the only ... Center and will showcase its product’s latest features from June 26 to June ... scientific poster on Disrupting Clinical Trials in The Cloud during the conference. ...
Breaking Biology Technology: