Isolation and identification of bacteria in gastrointestinal of eel (Anguilla bicolor) that has potential as probiotic

Antibiotic usage in aquaculture serves for the prevention and treatment of diseases but causes an accumulation of residues, and the development of resistant bacterial strains that demands the use of probiotics is increasing. The quality of fish not only seen on the weight of fish but also of bacteria associated with the digestive tract. Some types of bacteria found in the digestive tract of animals have an essential role in order to improve the utilization of feed, fish health, and improvement of environmental quality and microorganisms. The research aims to determine the type of bacteria that can be isolated and characterized from the gastrointestinal tract Anguilla bicolor and potential as a candidate probiotic bacteria. This study used data analysis with descriptively. The gastrointestinal tract is the intestine isolation and characterization of bacterial strains obtained. The observations made include morphological characters, hydrolysis tests (fat, starch, protein), and identification of each isolate. From the digestive tract, Anguilla bicolor found seven bacterial isolates based on the identification and competent to hydrolyze protein, fat, and starch consists of 3 species thought to be used as probiotics Anguilla bicolor are Bacillus subtilis, Bifidobacterium and Lactobacillus plantarum.