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:4/3/2017)...  Data captured by IsoCode, IsoPlexis Corporation,s ... statistically significant association between the potency of ... objective response of cancer patients post-treatment. The ... cancer patients will respond to CAR-T cell ... to improve both pre-infusion potency testing and cell ...
(Date:3/29/2017)... , March 29, 2017  higi, the health ... in North America , today announced ... and the acquisition of EveryMove. The new investment and ... set of tools to transform population health activities through ... lifestyle data. higi collects and secures data ...
(Date:3/24/2017)... Research and Markets has announced the addition of the ... Forecast to 2025" report to their offering. ... The Global Biometric Vehicle Access System ... over the next decade to reach approximately $1,580 million by 2025. ... forecasts for all the given segments on global as well as ...
Breaking Biology News(10 mins):
(Date:10/7/2017)... , ... October 06, 2017 ... ... experience providing advanced instruments and applications consulting for microscopy and surface analysis, ... in application consulting, Nanoscience Analytical offers a broad range of contract analysis ...
(Date:10/7/2017)... , Oct. 6, 2017  The 2017 Nobel ... three scientists, Jacques Dubochet, Joachim Frank ... in cryo-electron microscopy (cryo-EM) have helped ... the structural biology community. The winners worked with ... now routinely produce highly resolved, three-dimensional images of ...
(Date:10/6/2017)... ... October 06, 2017 , ... On Tuesday, ... webinar on INSIGhT, the first-ever adaptive clinical trial for glioblastoma (GBM). The featured ... event is free and open to the public, but registration is required. , ...
(Date:10/5/2017)... ... 05, 2017 , ... Understanding the microbiome, the millions of bacteria that live ... You Are My Future, the newest exhibit on display at the University City Science ... condition through the lens of the gut microbiome. , Gut Love opens October ...
Breaking Biology Technology: