- Topic:Aquaculture and aquaponics
A duplicated copy of id2b is an unusual sex-determining candidate gene on the Y chromosome of arapaima (Arapaima gigas)
The Arapaima is an endangered species of interest for sustainable aquaculture. The authors published an improved genome sequence and identified a Y-linked candidate gene for sex determination in males. A PCR test enables genotyping as a new tool for breeding and conservation of the Arapaima. It has already been used to distinguish males from females at the IGB as well.
Fulvic acid accelerates hatching and stimulates antioxidative protection and the innate immune response in zebrafish larvae
Improving growth and health parameters by immunostimulants is widely used in older fish, but rarely studied in larvae. Using zebrafish as a model organism, the authors evaluated the effects of exposure to fulvic acids (FAs) on embryonic development. They showed that FA at low to medium concentrations can increase the health of larvae, but becomes detrimental at higher concentrations.
Phenol-rich fulvic acid as a water additive enhances growth, reduces stress, and stimulates the immune system of fish in aquaculture
The study showed that immunostimulation via gills is possible with fulvic acid, and the high phenolic content improved overall health and stress resistance of fish.
Researchers have succeeded in sequencing the sturgeon genome, delivering a missing piece of the puzzle essential to understanding the ancestry of vertebrates. The genetic material of the sterlet has undergone very little change over the past 300 million years or more.