Results and Discussion Microorganisms in Aquaculture

Apresentação em tema: "Results and Discussion Microorganisms in Aquaculture"— Transcrição da apresentação:

1 Results and Discussion Microorganisms in Aquaculture
Survival of silver catfish (Rhamdia quelen) fingerlings and water quality in bioflocs and clear water systems Andréa Ferretto da Rocha1, Mario Luís Biazzetti Filho*1, Marcia Regina Stech1, Benito Guimarães de Brito1, Kelly Cristina Tagliari de Brito1, Rafael Tonini Mesquita1, Hiran Kunert Filho1, Daiane Carvalho1, Marcus Frederico Martins Pinheiro1, Aline Portella Cardoso1 1Fundação Estadual de Pesquisa Agropecuária, BR 101, Km 53; Terra de Areia - RS, Brasil; *Estudante graduação, Universidade Federal do Rio Grande do Sul, bolsista na Fundação Estadual de Pesquisa Agropecuária Introduction Results and Discussion Silver catfish (Rhamdia quelen) is an important native species for aquaculture in Southern Brazil (Baldisserotto, 2009) Management strategies are being considered to improve sanitary conditions for silver catfish farming, including the use of the alternative technologies as well as adding probiotics and additives on its diet or directly into the water Table 1 Survival and water-quality parameters of 29 days experimental period for Rhamdia quelen reared from different systems Clear Water + Probiotic Bioflocs Temperature °C 22.87 ± 1.01 a 22.59 ± 2.11 a 23.37 ± 1.15 b 23.46 ± 1.26 b Dissolved oxygen (mg L-1) 8.12 ± 0.40 b 8.29 ± 0.40 c 7.82 ± 0.55 a 7.84 ± 0.52 a pH 8.28 ± 0.39 b 8.18 ± 0.54 b 7.07 ± 0.32 a 7.23 ± 0.50 a Total alkalinity (mg L-1 CaCO3) 28.50 ± b 24.23 ± 7.60 b 59.2 ± a 57.90 ± 22,70a Turbidez (NTU) 4.99 ± 1.39 a 5.30 ± 1.43 a 87.54 ± b 85.97 ± b Total ammonium 1.0 ± 1.2 a 1.0 ± 0.6 ab 2.5 ± 2.3 b 2.8 ± 3.4 b Nitrite (mg L-1) 0.043 ± a 0.02 ± 0.01 a 0.66 ± 1.02 b 0.42 ± 0.81 b Nitrate (mg L-1) 0.90 ± 3.34 a 0.23 ± 0.,56 a 7.35 ± 5.15 b 9.1 ± 4.01 b Survival rate (%) 83.7 ± 32.5 a 3.7 ± 7.5 b 13.7 ± 12.5 b 11.2 ± 1 b Fig. 1. Silver catfish Microorganisms in Aquaculture Probiotic BIOREMEDIATION BIOCONTROL PROBIOTIC Gatesoupe, 1999 Bioflocs Data are presented as mean ± standard deviation of the entire period. Values not sharing a common letter differ significantly (p<0.05). Water reuse Environmentally friendly Supplementary natural food The results suggest nitrification processes occurring into the bioflocs tanks, and are in line with the others studies about the use of bioflocs system in fish farming. Avnimelech, 1999 Objective Farming silver catfish fingerlings in bioflocs system without water exchange is possible, however, survival results were not satisfactory, even as adding probiotics. Evaluate the survival of silver catfish and the quality of the water in different management systems Matherial and Methods An experimental assay was developed at FEPAGRO Aquicultura e Pesca, during the summer of 2015. 320 fingerlings (10.0 ± 1.9 g) were stocked in 16 circulars tanks filled with 200 L of water during 29 days. A lyophilized probiotic containing Bacillus licheniformis and Saccharomyces cerevisiae was used at a dose of 6 x 1013 CFU g-1 of feed daily. Fish were fed 3 times a day (5% of body weight ; 32% CP) Clear water tanks: water exchange The quality water parameters were measured weekly. Conclusion Adding probiotics had no positive effect on the parameters assessed during the study. Clear Water Clear Water + Probiotics Bioflocs + Probiotics Bioflocs References AVNIMELECH, Y Carbon/nitrogen ratio as a control element in aquaculture systems. Aquaculture 176 : 227–235. BALDISSEROTTO, B Pscicultura continental no Rio Grande do Sul: situação atual, problemas e perspectivas para o futuro. Ciência Rural 39: GATESOUPE, F.J The use of probiotics in aquaculture. Aquaculture 180: