جستجوی مقالات مرتبط با کلیدواژه « Specific growth rate » در نشریات گروه « ریاضی »

Artemia urmiana nauplii were used as a vector in bioencapsulation processing to carry blends of five probiotic bacilli called Protexin aquatic,including Bacillus circulans, B. subtilis, B. licheniformis, B. laterosporus and B. Polymyxa to digestive system of Beluga Huso huso larvae. Nauplii were bioencapsulated with three concentrations of 1×105 (T1), 2×105 (T2) and 3×105 (T3) bacteria per mililiter in suspension and were fed to Beluga larvae for 10 hours. The larvae were fed on the base of the 50% of their body weight for 6 times a day in a completely randomized design and the results were compared with control group (unbioencapsulated Artemia nauplii) in fourteenth day of experiment. The results suggest a positive effect of probiotic bacillus on growth of Beluga larvae compared to the control group. The highest weight was obtained in fish fed by bioencapsulated Artemia with a concentration of 1×105 bacteria/mL. . Food conversion rate significantly decreased in experimental treatments. The probiotic bacilli had significant positive effects on the specific growth rate, relative gain ratio, survival rate, average daily growth and thermal growth coefficient in comparison with control (P<0.05). However, condition factor did not show any significant difference (P>0.05). The results showed that probiotic bacilli have the highest ability in increasing the growth of Beluga larvae and fish fed by bioencapsulated Artemia with a concentration of 1×105 bacteria/mL had the best results.

The aim of this study was to investigate the effect of different dietary crude protein/energy ratios on growth indices and body composition of Bester juveniles. Triplicate groups (60 individuals per group) of fish (average weight ± SD, 358.4 ± 13.37g) were fed with three diet (D1, D2 and D3) including 31.67%, 35.54% and 40.86% of crude protein and 4377, 4800 and 5344 kcal of energy/kg, respectively, during eight weeks based on 1.5% of biomass per day. The result showed different significant of growth parameters (P<0.05). Body weight increase, condition factor, specific growth rate, average daily growth, protein productive value, and feed conversion ratio (FCR) improved in D2 and D3 treatment groups compared with D1. Comparison of the carcass composition of examined fish showed significant different between treatment groups (P<0.05). Therefore, the highest moisture, lipid and ash level of carcass gained in fish fed with diet D2 (P<0.05). Also highest carcass crude protein recorded in fish fed with diet D3 (P<0.05). These results suggested that the diet including 35.54% of crude protein and 4800 kcal of energy/kg is economic and suitable for culture of juvenile Bester.

A 33-day feeding experiment was conducted to assess the effects of supplemented diets with sturgeon intestinal bacteria as probiotics in feeding of silver carp (Hypophthalmichthys molitrix) larvaewith average weight 200 ± 10 mg. These probiotics were isolated from gut of ten healthy fingerlings of Beluga (Huso huso) with average weight of (5.51 ± 0.31 g). Four diets (S1¡ S2¡ S3 and S4) were prepared containing similar ingredient composition and were supplemented with blend of three probiotics (Bacillus licheniformis¡ Bacillus subtilis and yeast of Saccharomyces cerevisiae) at four different levels (0¡ 1.5×106¡ 3×106¡ 4.5×106 cells per 100 g of diet¡ respectively). At the end of experiment¡ the Silver carp larvae fed probiotic supplemented diet had an improved and growth feeding performance compared to fish larvae not fed probiotics. Rearing of silver carp with feeding by experimental diets of¡ S2 and S3 (3×106 and 4.5×106 cells 100 g) resulted in better growth and feeding parameters in compared with the control. These probiotics resulted in a significant increase (P