May 5, 2024
Dara Bagheri

Dara Bagheri

Academic Rank: Associate professor
Address:
Degree: Ph.D in شیلات
Phone: 3301
Faculty: Faculty of Nano and Biotechnology

Research

Title
Investigation of effects of different levels of Bacillus subtilis and Lactobacillus plantarum probiotics in combination in tank water on growth and carcasses quality factors of the Litopenaeus vannamei during frozen storage (-18oC)
Type Thesis
Keywords
پروبيوتيك، باسيلوس سوبتيليس، لاكتوباسيلوس پلانتارم، فاكتورهاي رشد، انجماد، كيفيت لاشه
Researchers Seyed Mehrdad Hasani Azhdari (Student) , Kamran Rezaei Tavabe (Primary advisor) , Mike Frinsko (Advisor) , Dara Bagheri (Advisor)

Abstract

The marine crustacean aquaculture industry has developed dramatically over the past two decades. However, these improvements have, in some cases, led to environmental degradation, and low productivity. The need to improve growth performance, feed efficiency and production of aquatic products safe for human consumption has increased interest in the development and applications of probiotics in aquaculture. In this study, Bacillus subtilis (B) and Lactobacillus plantarum (L) probiotics each in 2 doses B1 = 106 CFU / gr and B2 = 106 × 3 CFU / gr, L2 = 105 CFU / gr and L2 = 105 × 3 CFU / gr were combined in 2: 2 and added to the water reservoir breeding tanks of western white-footed shrimp, and the post-larvae were treated for 2 months in 4 treatments A (control), B (L1 × B2), C ( L1 × B1), D (L2 × B2), E (L2 × B1) were bred. Growth factors include: body weight gain, feed conversion ratio, survival rate, relative absorption rate, specific growth rate, hemolymph indicators including: protein, albumin, triglyceride and total hemolymph cholesterol as well as carcass composition including: fat content And carcass protein were measured, then the shrimp were transferred to the freezer at -18 ° C and on days 1, 15, 30, 45 and 60 the carcass quality factors including: Drip lost, water holding capacity, pH, thiobarbiotic acid, nitrogen compounds Volatility, carcass hardness as well as its elasticity were measured. The interaction effect of both strains on body weight gain, survival and carcass fat and protein indices was observed while they had no significant effect on feed conversion ratio. However, treatment B (L1 × B2) showed the best condition. As a result, the highest body growth rate, relative absorption rate and specific growth rate were related to treatment B (L1 × B2), the highest survival percentage was related to treatment E (L2 × B1), the highest amount of fat and carcass protein, respectively. It belonged to treatment E (L2 × B1). Treatment B (L1 × B2) also showed t