Banca de DEFESA: WANDERSON DUARTE PENIDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : WANDERSON DUARTE PENIDO
DATE: 25/08/2022
TIME: 08:30
LOCAL: meet.google.com/dps-guee-wxh
TITLE:

Performance evaluation of Nile tilapia (Oreochromis niloticus) fed diets supplemented with Lactobacillus plantarum, Bacillus subtilis and Candida infanticola.

KEY WORDS:

Bacillus subtilis; Probiotics; Pisciculture; Nile Tilapia; pathogens.

PAGES: 68
BIG AREA: Multidisciplinar
AREA: Biotecnologia
SUMMARY:

Aquaculture is the fastest growing agricultural activity in Brazil and in the world, with its products being the healthiest and least impacting the environment. Brazil is among the 15 largest producers of fish in the world and occupies the fourth position among the largest producers of tilapia in the world, and it is estimated that in 20 years it will become the world's largest producer of farmed fish, with the leadership of Nile tilapia (Oreochromis niloticus). The country has the largest reserve of fresh water on the planet, has a favorable climate and many adaptable species, which contributes to the great growth of its production. Even though fish and fishery products are the least impacting on the environment, environmental impacts can be caused if correct management is not carried out in the breeding process. Effluents with large amounts of organic matter, nitrogen and phosphorus are generated in the process, which contributes to the eutrophication of water bodies, with low availability of dissolved oxygen, resulting in the reduction or alteration of biodiversity. These factors can cause stress in the lives of fish, making them susceptible to pathogens. In this context, this work aims to study the action of Candida infanticola and Bacillus subtilis and Lactobacillus plantarum bacteria on the performance of Nile tilapia (Oreochromis niloticus). For this, the diet of tilapia fingerlings was supplemented with L. plantarum, B. subtilis and C.infanticola and the effect of this supplementation on fish viability and performance, crude protein and dry matter digestibility, increase of fish intestinal microvilli, as well as on resistance to pathogen infection (in vitro) and pond water quality. Among the treatments used, there was a significant effect of the treatment containing B. subtilis on feed conversion. The treatment with L. plantarum and also with the microbial consortium (B. subtilis, L. plantarum and C. infanticola) presented feed conversion values close to the result obtained from supplementation with B. subtilis. There were no effects of treatments with diets supplemented with L. plantarum, C. infanticola and Control on final weight and weight gain. Regarding feed intake, the treatment with L. plantarum had the lowest consumption and the treatment with the microbial consortium had the highest feed consumption, not differing from the control diet and treatments with B. Subtilis and C. infanticola. The survival rate in all treatments was greater than 90%. In the digestibility analysis, there was no significant effect for the treatments regarding crude protein digestibility and dry matter digestibility. There was a significant effect on the increase of microvilli for the treatment with the lactic acid bacterium L. plantarum and the bacterium B. subtilis, which may indicate an increase in surface area, resulting in greater absorption of available nutrients. In the antagonism analysis (in vitro), only B.subtilis showed formation of inhibition halos against the pathogen Aeromonas hydrophila. There was no effect of treatments on water quality parameters, maintaining the ideal throughout the experimental period, without causing stress or damage to fish performance.

BANKING MEMBERS:
Presidente - 1757978 - DANIEL BONOTO GONCALVES
Interna - 030.149.736-29 - KLÉDNA CONSTÂNCIA PORTES REIS - UFV
Externa ao Programa - 1719911 - JULIANA TEIXEIRA DE MAGALHAES
Externo à Instituição - CARLOS HENRIQUE DE FIGUEIREDO VASCONCELLOS - UFV