article · Aquaculture Nutrition
A 60-day feeding trial evaluated the effects of dietary Pediococcus acidilactici probiotic supplementation on European sea bass fingerlings. The experiment tested four dietary levels: a control without probiotics, alongside feeds containing 2.0, 2.5, and 3.0 grams of probiotic per kilogram of diet. Fish receiving probiotic-supplemented feeds demonstrated significantly higher growth performance, greater body crude lipid content, and increased intestinal villi height compared to the control group. The probiotic treatments also drastically reduced ammonia and pH levels in the rearing water. While survival rates, feed conversion ratios, and blood biochemical markers showed improvements, these changes were not statistically significant. Overall, the highest inclusion rate of 3.0 grams per kilogram generated the best performance across growth, gut histology, and water quality indicators.
Maintaining water quality and fish health is critical for sustainable aquaculture production. Supplementing diets with beneficial bacteria such as Pediococcus acidilactici supports fish gut health and growth while simultaneously reducing toxic ammonia accumulation in the water. This provides a biological approach to boosting production efficiency and environmental management in marine fish farming.
This research demonstrates a practical feed additive application for commercial European sea bass hatcheries and aquafeed manufacturers. By identifying an effective dosage of 3.0 grams per kilogram of diet, it offers an immediate formulation reference. The study represents applied research tested on fingerlings over 60 days, placing it at an experimental validation stage prior to full-scale commercial trials.
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The probiotics are being used as ecofriendly and bioremediation tools for developing sustainability to aquaculture. The present study was conducted to explore the practical capability of using dietary lactic acid bacteria (Pediococcus acidilactici) probiotics and see how its dose variation affected the water quality, growth performance, survival rate, body composition, blood biochemical parameters, and intestinal histology of European sea bass (Dicentrarchus labrax L.). A total of 120 fingerlings with an initial weight of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" id="M1"> <a:mn>9</a:mn> <a:mo>±</a:mo> <a:mn>0.2</a:mn> </a:math> g were divided into four groups, each with three replicates. The feeding experiment lasted for 60 days. In addition to the control (without probiotics) (T0), fish were fed diets containing (T1) 2.0, (T2) 2.5, and (T3) 3.0 g of probiotics per kg of diet twice a day. When compared to the control, sea bass fed probiotic-supplemented diets had significantly higher growth parameters, fish body “crude lipid,” and villi height ( <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" id="M2"> <c:mi>p</c:mi> <c:mo><</c:mo> <c:mn>0.05</c:mn> </c:math> , <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" id="M3"> <e:mi>p</e:mi> <e:mo><</e:mo> <e:mn>0.01</e:mn> </e:math> , and <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" id="M4"> <g:mi>p</g:mi> <g:mo><</g:mo> <g:mn>0.001</g:mn> </g:math> ). The P. acidilactici probiotic treatments improved survival rate, feed conversion ratio, body composition, and blood biochemical markers, but not statistically significant ( <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" id="M5"> <i:mi>p</i:mi> <i:mo>></i:mo> <i:mn>0.05</i:mn> </i:math> ). Also, in regard to water quality, P. acidilactici drastically reduced ammonia and pH levels. In this experiment, fish fed with a dosage of 3.0 g of this commercial probiotic per kg of probiotics performed better. The study found that including probiotics in the diets of European sea bass improved growth, body composition, survival rate, blood biochemical markers, intestinal histology, and some water quality parameters.
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DOI: 10.1155/2022/5841220
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