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:4/13/2016)... , April 13, 2016  IMPOWER physicians supporting ... are setting a new clinical standard in telehealth thanks ... By leveraging the higi platform, IMPOWER patients can routinely ... pulse and body mass index, and, when they opt ... and convenient visit to a local retail location at ...
(Date:3/22/2016)... India , March 22, 2016 /PRNewswire/ ... market research report "Electronic Sensors Market for Consumer ... Proximity, & Others), Application (Communication & IT, ... Geography - Global Forecast to 2022", published ... industry is expected to reach USD 26.76 ...
(Date:3/15/2016)... -- --> --> According ... "Digital Door Lock Systems Market - Global Industry Analysis, Size, ... digital door lock systems market in terms of revenue was ... to grow at a CAGR of 31.8% during the period ... (MSMEs) across the world and high industrial activity driving inclusive ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... ... May 25, 2016 , ... The Ankle ... plating options designed to address fractures of the distal tibia and fibula. This ... Acumed Ankle Plating System 3 is composed of seven plate families that span ...
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... ... for information (RFI) issued by the Office of the National Coordinator for Health ... experience, and determines if clinically relevant data were available when and where it ...
(Date:5/25/2016)... ... May 25, 2016 , ... WEDI, the nation’s leading authority on the use ... W. Stellar has been named by the WEDI Board of Directors as WEDI’s president ... executive leader with more than 35 years of experience in healthcare, association management and ...
(Date:5/25/2016)... , ... May 25, 2016 , ... ... Food and Drug Administration (FDA) has granted the company’s orphan drug designation request ... second orphan drug designation granted by the FDA. , Spinocerebellar ataxia is ...
Breaking Biology Technology: