Abstract
Probiotics have become a significant component of aquaculture in recent years. The use of antibiotics is decreasing successively because of their side effects in animals and their negative environmental impact, which is why alternative preventative measures are being sought. Probiotics that are effective in this field are playing increasingly important roles in safeguarding the health of fish and also as growth stimulants. The application of probiotics can help to successfully control the occurrence of disease in hatcheries, increase larval survival, and improve rearing parameters thanks to which the number of required brood-fish, which are expensive to maintain, can be reduced.