GROWTH-STIMULATING POLYPEPTIDES FOR USE IN FISH AND CRUSTACEANS

摘要

The invention relates to polypeptides which demonstrate an activity greater than tilapia growth hormone. The aforementioned polypeptides can stimulate the growth, survival and quality of fish and crustacean larvae. In addition, the polypeptides increase the defence of the organism against pathogenic agents and stimulate parameters relating to the immune system of aquatic organisms. The genes that code for said polypeptides were cloned in a Pichia pastoris expression vector which can be used to obtain extracellular protein. The culture supernatant containing the polypeptides in question was administered to aquatic organisms using immersion baths or as a feed supplement.