Transgenic fish: Risks and benefits
Some transgenic fish – lines of “high-growth” tilapia, salmon and carp – are nearing the stage at which they could be considered for commercial production.
Researchers overcoming learning curve for production of sea urchin seedstock
Cost-effective seedstock supply is needed for commercial production of sea urchins. Metamorphosis from free-swimming planktonic larvae to benthic grazers has presented a significant challenge.
Modular advantages for catfish production
Modular production of channel catfish offers better inventory control, takes advantage of early-age growth rates and reduces harvest-size variation.
Feeds, feeding methods advance for largemouth bass
U.S. demand continues for largemouth bass in sport fish stocking and live markets, whereas Asian consumers prefer live largemouth over most freshwater fish.
Nose training
United States government inspectors use their highly trained noses to determine whether imported seafood should enter U.S. commerce.
Pre-harvest conditions, handling affect sensory quality of freshwater fish
Flavor is an important seafood quality attribute that can be affected by preharvest conditions. Off-flavors are a result of natural enzymatic, oxidative and bacterial spoilage processes.
Industry expansion continues for pangasius
With a range of positive attributes, pangasius has become one of the largest aquaculture commodity products in the world. The fast-growing fish resist low dissolved oxygen at high stocking densities and require little fishmeal in diets.
Maximizing channel catfish production
Higher production typically results in higher profits at channel catfish farms, but ponds must be individually managed to maximize production.
Genetic diversity of HPV parvovirus
Hepatopancreatic parvovirus is linked to growth retardation in shrimp. In a study, the genomic sequences of HPV from Madagascar and Tanzania were compared to those from Australia, Thailand and Korea.
Common diseases of pangasius catfish farmed in Vietnam
As with other species, varied health problems – and treatments – related to parasites and bacteria have been encountered in pangasius catfish.
Ultrasound tested in channel catfish production systems
Ultrasound may serve as an alternative to chemical treatments in channel catfish production. In studies, controlled application of ultrasound did not significantly affect catfish feed consumption and weight gain.
Misuses of sodium bicarbonate in pond aquaculture
Sodium bicarbonate is a useful chemical in recirculating aquaculture systems and fish transport tanks. However, two common uses of the compound in pond culture – to remove carbon dioxide and treat off-flavors – do not work.
WSSV infection and molt stage
In studies, the authors found no significant difference in internal susceptibility to WSSV infection between shrimp in different molt stages.
pH field measurements improve catfish fry survival
Since catfish fry survival lowers if subjected to an abrupt pH rise of 0.5, the authors recommend measuring pH in transport tanks and receiving ponds and the addition of buffering agents to transport tanks.
Temperature cycles induce early maturation in channel catfish
Research with channel catfish found that the induction of puberty is a developmental process that requires temperature cycles and is independent of body size. It may be possible to achieve early maturation in channel catfish in less than two years.
CART regulates food intake in channel catfish
Experiments by the authors showed that the gene activity of the brain neurotransmitter CART changed in catfish in response to feed intake.