Sex reversing fish

Description:Recent research indicates that the primitive germ cells have a key role. Production of all male tilapia can be accomplished by such techniques as separating the males and females manually, hybridization, chromosomal manipulation and hormonal sex reversal. Effect of MT on the environment: Tilapia fry that escape from hatchery facilities where MT is administered will be morphologically male and consequently, they will have much lower potential to reproduce, including interbreeding with wild stock and this may alter the dynamics of the ecosystem. Zebrafish nanos3 is required to maintain the germ line — therefore nanos3 mutants are initially fertile, but by 5 months old females are now infertile due to the loss of oocytes during maturation. After 5 months nanos3 mutant adult female undergo sex-reversal after the loss of oocytes and show a much yellow pigmentation resembling the male phenotype. One method was to make use of a mutant animal that undergoes germ cell loss later in adulthood — nanos 3 null mutants.

Views: 2424 Date: 2018-07-10 Favorited: 16