Effects of Dietary Lactobacillus plantarum on Growth Performance, Digestive Enzymes and Gut Morphology of Litopenaeus va
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Effects of Dietary Lactobacillus plantarum on Growth Performance, Digestive Enzymes and Gut Morphology of Litopenaeus vannamei Xiaoting Zheng 1,2 & Yafei Duan 1 & Hongbiao Dong 1 & Jiasong Zhang 1
# Springer Science+Business Media, LLC 2017
Abstract A 15-day feeding trial was conducted to investigate the effect of dietary Lactobacillus plantarum on growth performance, digestive enzyme activities and gut morphology of juvenile Pacific white shrimp, Litopenaeus vannamei (initial body weight = 7.96 ± 0.59 g). Four microbound diets were formulated to contain fermentation supernatant (FS), live bacteria (LB), dead bacteria (DB), and cell-free extract (CE) of L. plantarum. Results indicated that final weight was significantly higher in FS, DB, and CE group in comparison to the control group (P < 0.05). The maximum weight gain rate (WGR) and specific growth rate (SGR) of the CE diet group were significantly higher than that of other groups (P < 0.05). The FCR of CE diet group was lower than that of the control, LB, DB, and FS diets groups (P < 0.05). The highest digestive enzyme activities (amylase, lipase, and pepsin activity) in the hepatopancreas and gut of shrimp were observed in the CE diet group. Histological study revealed that dietary CE diet could significantly increase the enterocytes height of shrimp. The administration of cell-free extract of L. plantarum could effectively improve the growth performance of L. vannamei via the improvement of digestive enzyme activities and the enterocytes height of shrimp. The results of this study will be essential to promote application of probiotics in shrimp aquaculture.
* Jiasong Zhang [email protected] 1
Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, 231 Xingangxi Road, Guangzhou 510300, People’s Republic of China
2
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, People’s Republic of China
Keywords Lactobacillus plantarum . Litopenaeus vannamei . Growth performance . Digestive enzymes . Gut morphology
Introduction Due to its tolerance to wide range of environmental conditions, fast growth and high economic value, Pacific white shrimp, Litopenaeus vannamei, has been considered as one of the most important mariculture shrimp species around the world [1]. Food and Agriculture Organization (FAO) has shown a huge increase in Pacific white shrimp production from 154,515 t in 2000 to 3,668,682 t in 2014, registering an increase of nearly 2274%. Feed cost is one of the major spending in shrimp culture, which typically account for more than 70% of the production cost. The problem of low feed utilization in shrimp culture has caused the serious economic loss throughout the world [2]. Therefore, enhancing the growth performance of shrimp and improving feed utilization are critical goal of aquaculture industries and scientific resea
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