Dr. Gomelsky and his team recently published two articles in new issues of North American Journal of Aquaculture. The first article describes ploidy variability and viability of fish obtained from triploid koi females. It is typically considered that triploid fish are sterile. However, triploid
koi females, which were obtained at the Aquaculture Research Center at Kentucky State University, developed large ovaries and appeared to be fertile. The data presented in the article shows that fish obtained by crossing triploid koi females with normal diploid koi males are aneuploids and
have intermediate ploidy between diploid (2n) to triploid (3n) level. This indicates that triploid females produce aneuploid eggs with unbalanced chromosome numbers.
The second article describes inheritance of red eyes in koi. Red eyes is a trait typical for albino fish or other animals. However, data presented in this article shows that trait "red eyes" in koi is under control by not albino but by another demelanization mutation. In experimental progenies red-eyed fish with black (melanin) pigmentation on body were identified. Also, crossing of red-eyed koi with wild-type colored common carp resulted in appearance of fish with black eyes and light body color. These studies were supported by USDA Evans Allen and State's Program of Distinction funds.
Fluorescein Dye to Reveal the Effects of Routine Collection of Weight and Length Data from Largemouth Bass
Ayra Burney-Moorehead, Dr. Ken Semmens and Charles Weibel investigated the use of Fluorescein dye to reveal the effects of routine collection of weight and length data from largemouth bass. Routine handling may damage the surface of the fish in a way that cannot easily be observed.
The dye does not penetrate undamaged surfaces, but will penetrate and adhere to damaged areas. When exposed to UV light, it is possible to reveal damage that cannot ordinarily be observed in a living animal. In this experiment, Ayra evaluated three different dye concentrations.
photos by Charles Weibel
Aquatic Weed Control Demonstration With The Use Of Koi
On Thursday, June 23, 2016, Drs. Gomelsky and Durborow loaded a live haul tank with koi for client Rocky Allen to stock in his aquaculture ponds for an aquatic weed control and prevention Extension demonstration. Rocky farms bass, tilapia, minnows and red claw crayfish in Oldham County, KY.
KSU Students Help With Mussel Conservation And Research
On Friday, June 10th, Ariel Jones who is with the Summer Apprenticeship Program (SAP) joined the mussel research team to set out silos filled with mussels in Beech Fork close to Bardstown, KY. This site was chosen as a reference stream because it still has a good mussel population and during the last year's research by Dr. Wendel Haag, mussels appeared to grow well at Beech Fork.
Joining at this site to help set out the silos were; Dr. Wendell Haag from the U.S. Department of Forestry, Scott Watts and Fritz Vorisek from the Center for Mollusk Conservation, Christopher Lyvers a KSU undergraduate, Dr. Bob Durborow from KSU Extension, and Lesley Sneed a graduate student at KSU. Lesley's thesis research involves 28 sites around Kentucky with these silos that contain juvenile mussels grown by the Center for Mollusk Conservation. The mussels were born in December of last year and average 4mm in size. Each silo contains 25 mussels and each site has a minimum of three silos. The silos are left in the streams over the summer and then retrieved at the end of August. During this time, water samples will be collected at each site and analyzed by the Kentucky Division of Water. The Stream Institute of University of Louisville has installed Sonde meters at two sites, which will monitor water quality measurements. In August, each mussel will be measured, weighed and analyzed. These mussels are being used to access the water quality of streams that used to have an abundance of mussels present but in recent years those populations have declined.
High Tunnels Stocked With Tilapia
Dr. Ray and his team stocked the KSU High Tunnel Aquaculture Tanks with tilapia on May 31 and June 1, 2016. These fish were purchased from a hatchery in February when they were 0.5g. They were then raised in nursery tanks in the Aquaculture Production Technology Building, and stocked at the High Tunnels at about 40g each. They stocked 1,155 fish into each of 12 tanks at the tunnels where they will be grown to market size. The team is predicting that they will harvest the fish at about 570g each or 1.25 lbs. in late September. Some of the research questions being addressed include how can low-cost recirculating systems be utilized in high tunnels for fish production, what are the costs and potential profit of such an operation, and how can fish and plant production be intergrated in high tunnels?
Photos by Charles Weibel
Marine Shrimp Harvest
Dr. Ray's team harvested another batch of marine shrimp from the recirculating aquaculture systems in the Aquaculture Production Technology Building. These were jumbo shrimp that weighed about 30 grams or approximately 15 shrimp per pound, and about 50 pounds were harvested total.
By using production systems that consume very little water, the Ray team is able to produce fresh, marine shrimp right here in Kentucky all year-round. A substantial number of regional and local farmers are exploring this technology to supply markets in metropolitan areas with hard-to-find fresh shrimp.
Photos by Charles Weibel
U.S. Farm-Raised Fish and Shellfish Publications Available for Education and Promotion
The National Aquaculture Association (NAA) has developed a variety of fact-based, high-quality, full-color brochures. These publications communicate to consumers, buyers, chefs and health care professionals the quality, value and wholesomeness of U.S. farm-raised fish andshellfish as well as the federal and state regulations that govern production, handling and processing.
New Brochure - Locally Farmed Seafood: Safe & Sustainable encourages consumers to buy locally farmed fish and shellfish for their safe, wholesome and nutritious benefits, environmental sustainability, and the positive impact on local economies.
U.S. Farm-Raised Seafood and Food Safety describes non-voluntary and voluntary federal and state food inspection and safety programs and the incredible nutritional values of farm-raised fish and shellfish.
U.S. Farm-Raised Fish and Shellfish Q&A answers commonly asked water quality, sustainability, drug and chemical use, diet and food safety questions with science and regulatory facts.
U.S. Farm-Raised Fish and Shellfish for a Healthier & Happier Life provides in-depth nutritional information for children, teens and adults as well as the health benefits of consuming fish and shellfish during pregnancy. The facts concerning Omega-3 fatty acids, mercury and PCBs are also presented.
United States Aquaculture: Fact & Fiction corrects erroneous perceptions concerning fishmeal, food safety, drug and chemical use, Omega-3 fatty acids, mercury, environmental effects, sustainability, PCBs, and eco-labels.
Each of these attractive, educational publications can be previewed at:
Dr. Boris Gomelsky Publishes Video On Koi Breeding
Dr. Boris Gomelsky and KSU Aquaculture graduate students spawned koi in the hatchery this Spring. Video was recorded, edited and posted onto YouTube. This video demonstrates the process of koi artificial breeding and includes stripping of eggs and sperm from koi broodstock, and artificial fertilization of eggs. In order to remove adhesiveness, after fertilization eggs are placed in McDonald incubation jars where they are vigorously moved in water/milk suspension by air bubbles for 50-60 minutes. Then air flow is substituted with water flow for further incubation of eggs.
Video edited by Charles Weibel
The Importance Of Fish Consumption
The benefits of fish for health are well demonstrated. A new paper published in the peer-reviewed "Food Policy" journal recommends that the nutritional importance of fish, especially in resource-poor populations, needs to be taken into account in the development of national policy.
The paper, "Sustaining healthy diets: The role of capture fisheries and aquaculture for improving nutrition in the post-2015 era" says that improving fisheries and aquaculture with the adoption of nutrition-sensitive policies are critical means to achieving sustainable development goals (SDGs). These SDG's make achieving food security and ending malnutrition a global priority. However, the importance of fish for feeding our growing global population and providing a 'healthy life for all' is often overlooked says the paper.
Shakuntala Thilsted, programme leader, WorldFish, said: "Fisheries and aquaculture must be seen as a core component of the agriculture sector, as well as an entry point for multi-sectoral interventions aimed at improving nutrition and health outcomes."
Aquaculture Research Center Picked As One Of The Seven Wonders Of Frankfort
KSU's Aquaculture Research Center
"I would humbly nominate the KSU Aquaculture Research Center as one of the 7 Wonders of Frankfort," said James Tidwell, Chair of the University's Division of Aquaculture. "The program and facility are unique in the Commonwealth and recognized nationally and internationally." Combined research efforts by KSU and Alltech are seeking ways to lessen reliance on marine resources and to help reduce negative environmental impacts. The global population is also projected to pass 11 billion by the end of the century, so this joint research is also seeking new ways to feed the World."
Dr. Boris Gomelsky, KSU Aquaculture Professor, describes two mutations in koi and demonstrates mutant fish from experimental progenies.
Video edited by Charles Weibel
Growing Marine Shrimp in a Biofloc System
This video was shot during a harvest of the indoor marine shrimp production system at Kentucky State University's Aquaculture Research Center. Dr. Andrew Ray describes some of the benefits and concepts behind biofloc-based aquaculture. The video serves as an introduction to this relatively new and exciting topic which can be used to grow marine shrimp in practically any building, allowing fresh, whole, jumbo shrimp to be grown near and sold to a variety of inland markets.
Dr. Jim Tidwell on GCTV with Bill Miller
Dr. Jim Tidwell, Chair of Kentucky State University's Division of Aquaculture and past-president of both the US Aquaculture Society and the World Aquaculture Society, discusses how to deal with dwindling fish supplies and overfishing.
Aquaponics - An Integrated Fish and Plant Production System