GROWTH AND LENGTH-WEIGHT RELATIONSHIP OF Trichopodus trichopterus (Pallas, 1770) FED A SUPPLEMENTED DIET WITH DIFFERENT CONCENTRATIONS OF PROBIOTIC
Abstract
The aim of the present study was to evaluate the effects of diet with different microbial concentrations on the growth and length-weight relationship of Trichopodus trichopterus. For this aim a study was designed with four experimental treatments and the control to evaluate different microbial concentrations on growth and length-weight relationship. The counts of bacteria that were used for dietary supplementation were 1×104, 2×104, 3×104 and 4×104 CFU g-1 in T1, T2, T3 and T4 treatments, respectively. The results indicated that the use of 3×104 CFU g-1 concentration increased the length, and a positive allometric growth was observed. The higher length frequency was estimated in T3. The results indicated that the use of microbial additives with proper concentration causes different allometric growth.
The basal commercial diet (BioMar-France) contained about 54% of protein, 18% of lipid and 9.7% of ash. The basal diet
was used as the control diet. Out of the control diet, four experimental diets containing four graded levels of B. circulance and B. subtilis were prepared. The probiotic strains, B. subtilis and B. circulance used in this study were obtained from Protexin commercial products (London, England) and cultured on Tryptic Soy Agar (TSA) plates. The counts of bacteria in diets were approximately (T1) 1×104, (T2) 2×104,(T3) 3×104 and (T4) 4×104CFU g-1
.
