The method allows researchers to more efficiently and reliably produce fish that have three sets of chromosomes, instead of the usual two sets. Fish with the extra set of chromosomes can't reproduce, so the energy from the food they eat is shifted from reproduction to growth. Also, cultured fish that are not capable of breeding with native populations can be stocked in natural waters.
Bigger fish for consumers and sterile fish for producers and anglers are the goals of ARS scientists who are working with the aquaculture industry on genetic methods to more efficiently produce fish that grow faster on less feed and can't reproduce in the wild.
William K. Hershberger, former research leader at the ARS National Center for Cool and Cold Water Aquaculture (NCCCWA) in Leetown, W.Va., and NCCCWA biologist Mark Hostuttler investigated the earliest stages of fish development, from fertilized egg to the two-cell stage, and developed a more effective way to produce rainbow trout that have four sets of chromosomes. Those trout are then crossed with typical fish that have two chromosome sets, yielding offspring that have the desired three sets of chromosomes.
Now, ARS fish physiologist Gregory Weber and Hostuttler have improved on that method, and preliminary studies have expanded its application to Atlantic salmon, brook trout and brown trout. They are also in the process of breeding these fish for experiments that will determine whether these three-chromosome-set fish are good performers in terms of production traits such as growth to market size, stress tolerance, and disease resistance.
Additionally, Weber and Hostuttler have developed a way to validate chromosome status on 20 fish at a time, instead of just one.
ARS is the primary intramural scientific research agency of the U.S. Department of Agriculture (USDA). The research supports the USDA priority of promoting international food security.
USDA is an equal opportunity provider, employer and lender. To file a complaint of discrimination, write: USDA, Director, Office of Civil Rights, 1400 Independence Ave., S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice), or (202) 720-6382 (TDD).
Sharon Durham | Newswise Science News
New study shows producers where and how to grow cellulosic biofuel crops
17.01.2018 | University of Illinois College of Agricultural, Consumer and Environmental Sciences
Robotic weeders: to a farm near you?
10.01.2018 | American Society of Agronomy
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy