Maximizing channel catfish production
Higher production typically results in higher profits at channel catfish farms, but ponds must be individually managed to maximize production.
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.
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.
Shrimp feed trials find pen size matters
By comparing the growth of shrimp fed different diets in big versus small net pens, trial results suggested that shrimp could compensate for lower diet quality by grazing on the algae growing on the surfaces of the net cages.
Effects of varied dietary lipid sources tested in tilapia study
A study of Nile tilapia provided feed with varying dietary lipid sources found that fish fed a diet with beef tallow exhibited poorer survival and growth performance than fish fed diets with plant oils, fish oil, or combinations of oils and tallow.
Perspectives for red-banded sea bream culture
Red-banded sea bream could be farmed in systems designed for other sparid species. The authors’ facilities have achieved spontaneous spawning.
By-the-numbers nutritional bioenergetics for optimal feeding
Using a series of equations, energy and protein requirements for every fish species can be calculated and adapted to changing conditions.
Snail control in fish ponds
The freshwater drum is a proposed snail-control vector in catfish ponds. In tank studies the drum showed high survival and reduced snail populations.
Bivalent vaccine protects yellowtails, amberjack against pasteurellosis
The authors developed an efficacious combination vaccine against P. piscicida and L. garvieae for yellowtail and amberjack. Field trials showed positive results, and the vaccine was approved for use in Japan.