According to statewide stocking records from the Texas Parks and Wildlife Department, more than 10 million catfish have been stocked into Texas reservoirs since 1993. These stockings can result in established fisheries, but many others fail to produce established populations.
A new Baylor University study has identified several key physical, chemical and biological factors that influence the success of blue catfish populations in Texas reservoirs. The study was completed in collaboration with the Texas Parks and Wildlife Department and is the largest and most comprehensive study ever done exploring catfish survivability in Texas.
The study results were presented at the second International Ictalurid Symposium and will appear in Conservation, Ecology and Management of Worldwide Catfish Populations and Habitats by the American Fisheries Society in July 2011.
“Understanding the factors that influence the success of blue catfish populations will help researchers and managers make better informed decisions regarding where, exactly, the best lakes are to stock,” said Brian Bartram, a Baylor graduate student who helped lead the study and is a Texas Parks and Wildlife biologist. “These findings confirm what we were seeing in the field and now provide a scientific backing to any future water management plans as they relate to catfish.”
Baylor researchers sampled 30 reservoirs across Texas and compared blue catfish abundance, condition and natural reproduction with multiple physicochemical and biological variables at each reservoir.
The study found:
• While surface area and nutrient productivity showed the most influence on blue catfish populations, it is the correct combination of the two that seems to provide the optimal conditions for blue catfish to thrive. The combination of high nutrient productivity like phosphorus and chlorophyll, within large reservoirs seemed to provide the optimum reservoir conditions to support blue catfish populations. For example, Lake Corpus Christi performs well in terms of catfish survivability since it is a large lake with high nutrient supply.
• Overall, the reservoirs that showed no evidence of catfish reproduction had relatively very small surface areas, ranging from 166 hectares to 961 hectares. For example, Lake Kurth in east Texas could not sustain a catfish population. The Baylor researchers believe reservoirs with small surface areas have a small geographic footprint, encompassing fewer habitat types and may not provide suitable spawning or food habitats. Previous studies have shown that catfish prefer deep, inundated river channel habitats over coves and shallow water habitats.
• Climate also was a factor in survivability, however it was very loosely correlated. Latitude showed a positive loading, while growing season showed a negative loading on the climate factor, meaning as one moves north, catfish survivability increased. However, the Baylor researchers say this result may simply be a product of geography and reservoir distribution in Texas. There are more reservoirs in the central and northern parts of the total reservoir distribution and most are large, resource filled reservoirs.
“This study suggests that reservoir attributes and environmental variables play a role in the establishment and survival of blue catfish,” said Dr. Patrick Danley, associate professor of biology at Baylor, who helped lead the study. “We can now predict across the entire state which lakes can sustain catfish and which ones struggle.”
For more information, contact Matt Pene, assistant director of media communications at Baylor, at (254) 710-4656.
Matt Pene | Newswise Science News
Scientists on the road to discovering impact of urban road dust
18.01.2018 | University of Alberta
Gran Chaco: Biodiversity at High Risk
17.01.2018 | Humboldt-Universität zu Berlin
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