Effects of dietary Lactobacillus helveticus ATC 15009 on growth performance, hematology parameters, innate immune responses, and the antioxidant status of rainbow trout (Oncorhynchus mykiss) under high rearing density

This study aimed to evaluate the effects of dietary probiotic supplementation of on growth, digestive enzymes, and hematological, biochemical, immune, and antioxidant parameters, as well as intestinal microbiota of rainbow trout ( ). Fish (35.46±0.9 g) were fed with different levels of dietary : control, 1 × 10 , 1 × 10 , 1 × 10 , and 1 × 10 at high stocking density (80 kg m ) for 60 days. Results indicated that growth performance significantly improved in probiotic supplemented fish (P