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:: Volume 26, Issue 5 (1-2018) ::
isfj 2018, 26(5): 131-138 Back to browse issues page
Effects of Lactobacillus on growth parameters, survival rate and resistance of rainbow trout (Onchorhynchus mykiss) to Streptococcus iniae
Reza Safari , Zahra Yaghoubzadeh
Caspian Sea Ecology Research center
Abstract:   (801 Views)

In this study, the effects of Lactobacillus which was isolated from the gut of rainbow trout were evaluated on growth parameters, survival rate and resistance of rainbow trout to Streptococcus iniae. This bacterium was added to the fish diet in 3 treatments (log 7, 8 and 9) and a control treatment was considered. The effects of various treatments on growth parameters and survival were evaluated in day 30 and day 60. At the final stage, resistance of treated fish to streptococcosis was evaluated. The results showed that Lactobacillus was able to improve the growth parameters (weight, feed conversion ratio, protein efficiency ratio, coefficient of obesity, specific growth rate and protein yield coefficient) and survival rate of fish in which the log 8 LAB showed a significant difference compared to the other treatments and the control treatment. The challenge of rainbow trout with Streptococcus iniae indicated that the highest survival rate was observed in the treatment with the log 8 LAB (96.66%), whereas the lowest survival rate was observed in the control treatment (25.38%). These results indicated that Lactobacillus which was isolated from the gut of rainbow trout showed probiotic properties and improved growth parameters of fish. Moreover, it increased the resistance of rainbow trout to streptococcosis.
 

Keywords: Lactobacillus, Rainbow trout, Growth parameters, Streptococcus iniae
Full-Text [PDF 422 kb]   (505 Downloads)    
Type of Study: Research | Subject: بيوتكنولوژي و فرآوري هاي شيلاتي
Received: 2015/11/10 | Accepted: 2018/02/7 | Published: 2018/02/7
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safari R, yaghoubzadeh Z. Effects of Lactobacillus on growth parameters, survival rate and resistance of rainbow trout (Onchorhynchus mykiss) to Streptococcus iniae. isfj. 2018; 26 (5) :131-138
URL: http://isfj.ir/article-1-1450-en.html


Volume 26, Issue 5 (1-2018) Back to browse issues page

با کسب مجوز از دفتر کمیسیون بررسی نشریات علمی وزارت علوم، تحقیات و فنآوری مجله علمی شیلات بصورت آنلاین می باشد و تعداد محدودی هم به چاپ می رساند. شماره شاپای جدید آن ISSN:2322-5998 است

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