Navigation Links
Speed trap for fish catches domestic trout moving too slow

PULLMAN, Wash.Washington State University researchers have documented dramatic differences in the swimming ability of domesticated trout and their wilder relatives. The study calls into question the ability of hatcheries to mitigate more than a century of disturbances to wild fish populations.

Kristy Bellinger, who did the study for her work on a Ph.D. in zoology, said traditional hatcheries commonly breed for large fish at the cost of the speed they need to escape predators in the wild.

"The use of hatcheries to support declining wild salmon and steelhead is controversial," said Bellinger. "They have a role as being both a part of the solution in supplementing depleted stocks and as being a hindrance to boosting natural populations, as they often produce fish that look and behave differently from their wild relatives."

Bellinger conducted the study with Gary Thorgaard, a nationally recognized fish geneticist and professor in WSU's School of Biological Sciences, and her advisor, Associate Professor Patrick Carter. Their work is published in the journal Aquaculture.

The study used a sort of speed trap for fish, a meter-long plastic tank filled with water and fitted with electronic sensors. Over 10 weeks, Bellinger repeatedly ran 100 clonal (genetically similar) hatchery-raised and semi-wild rainbow trout through the tank, clocking their speed and monitoring their growth from week to week. The clonal rainbow trout were propagated on the WSU campus.

The domesticated fish tended to grow faster. But while increased size is generally seen as a sign of fitness, the researchers saw that wasn't the case as far as speed is concerned. "The highly domesticated fish have bigger body sizes but slower swim speeds compared to the more wild lines that are smaller," said Bellinger. "It is intuitive to think that the more you feed them, the more they're going to grow, the faster they're going to be, and that's what we see within each clonal line. However, between the lines, the domesticated fish were larger but slower sprinters."

Over the past century, hatcheries have become a mainstay of recreational fishing, providing millions of trout and other salmonids to lakes and streams. More recently, hatcheries have come to be seen as tools in conserving native stocks. The state of Washington has more than 200 hatcheries, with most producing salmon and steelhead, an ocean-running trout, and about one-fourth producing trout and other game fish.

Hatchery managers, said Bellinger, tend to select for large fish.

"Fish managers want the biggest bang for their buck," she said. "But if increased size is a tradeoff of sprint speed, as our data show, then we assume hatchery fish are being picked off by predators due to their slower speed, which makes the process of supplementing native fish with hatchery fish an inefficient tool for conservation and a waste of money."


Contact: Kristy Bellinger
Washington State University

Related biology news :

1. Columbia Engineering and Penn researchers increase speed of single-molecule measurements
2. Need for speed
3. BGI and Aspera collaborate on high-speed data exchange to advance genome research
4. Analysis of speed of Greenland glaciers gives new insight for rising sea level
5. Worlds largest release of comprehensive human cancer genome data helps speed discoveries
6. Speeding up drug discovery with rapid 3-D mapping of proteins
7. 7 pharmaceutical companies join academic researchers to speed TB drug discovery
8. Programmable RNA complex could speed genome editing in the lab
9. Rising carbon dioxide in atmosphere also speeds carbon loss from forest soils, IU-led research finds
10. ECGs administered by paramedics can speed treatment for severe heart attacks
11. Speed and power of X-ray laser helps unlock molecular mysteries
Post Your Comments:
Related Image:
Speed trap for fish catches domestic trout moving too slow
(Date:5/16/2016)... , May 16, 2016   EyeLock LLC ... today announced the opening of an IoT Center of ... strengthen and expand the development of embedded iris biometric ... unprecedented level of convenience and security with unmatched biometric ... one,s identity aside from DNA. EyeLock,s platform uses video ...
(Date:5/9/2016)... 9, 2016 Elevay is currently ... expanding freedom for high net worth professionals seeking travel ... globally connected world, there is still no substitute for ... duplicate sealing your deal with a firm handshake. This ... taking advantage of citizenship via investment programs like those ...
(Date:4/28/2016)... , April 28, 2016 Infosys ... (NYSE: INFY ), and Samsung SDS, a global ... that will provide end customers with a more secure, fast ...      (Logo: ) , ... but it also plays a fundamental part in enabling and ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... ... 27, 2016 , ... Parallel 6 , the leading software as a ... Reach Virtual Patient Encounter CONSULT module which enables both audio and video telemedicine ... team. , Using the CONSULT module, patients and physicians can schedule a face to ...
(Date:6/24/2016)... 2016  Regular discussions on a range of subjects including ... two entities said Poloz. Speaking at a lecture ... , he pointed to the country,s inflation target, which is ... "In certain areas there ... common economic goals, why not sit down and address strategy ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... announce the launch of their brand, UP4™ Probiotics, into Target stores nationwide. The ... is proud to add Target to its list of well-respected retailers. This list ...
(Date:6/23/2016)... ... June 23, 2016 , ... Charm Sciences, Inc. is ... has received AOAC Research Institute approval 061601. , “This is another AOAC-RI approval ... Bob Salter, Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods ...
Breaking Biology Technology: