Doenças parasitárias e manejo profilático de tambaquis (Colossoma macropomum) na região do Baixo São Francisco.

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Efficacy of salt to control leech infestation in ornamental Pleco fish.

This study evaluated the efficacy of formalin and sodium chloride bathing to control leech in freshwater ornamental Peckoltia oligospila loricariid fish through blood parameters. This experiment was conducted by using a completely randomized design in three aspects (control, 250mg/L formalin short bath, and 15g/L NaCl short bath for 15 minutes) and four replicates. Water quality, blood parameters and glucose were evaluated. NaCl showed the best results to control parasites. There was no significant difference related to blood parameters. NaCl treatment promoted parasites control over Peckoltia oligospila without changes in hematological parameters

Genomic prediction of lactation curves of Girolando cattle based on nonlinear mixed models.

Knowledge of lactation curves in dairy cattle is essential for understanding the animal production in milk production systems. Genomic prediction of lactation curves represents the genetic pattern of milk production of the animals in the herd. In this context, we made genomic predictions of lactation curves through genome-wide selection (GWS) to characterize the genetic pattern of lactation traits in Girolando cattle based on parameters estimated by nonlinear mixed effects (NLME) models. Data of 1,822 milk control records from 226 Girolando animals genotyped for 37,673 single nucleotide polymorphisms were analyzed. Nine NLME models were compared to identify the equation with the best fit. The lactation traits estimated by the best model were submitted to GWS analysis, using the Bayesian LASSO method. Then, based on the genomic estimated breeding values (GEBVs) obtained, genomic predictions of lactation curves were constructed, and the genetic parameters were calculated. Wood's equation showed the best fit among the evaluated models. Heritabilities ranged from 0.09 to 0.29 for the seven lactation variables (initial production, rates of increase and decline, lactation peak, time to peak yield, persistence and total production). The correlations among GEBVs ranged from -0.85 to 0.98. The concordances between the best animals selected according to the selected traits were greater when the correlations between GEBVs for these traits were also high. Consequently, the methodology allowed us to identify the best nonlinear model and to construct the genetic lactation curves of a Girolando cattle population, as well as to assess the differences between animals and the association between lactation variables

Is there sustainability for satellite ornamental fishing regions? A case study of Guamá River basin, Pará, Brasil.

Ornamental fisheries and socio-economic aspects of fishermen in the major fishing regions in Brazil such as the Xingu River have been well studied. However, there is lack of information about the sustainability of ?satellites? (auxiliary) fishing areas, which contribute towards supplying fish for exportation centers as Belém, the Capital of Pará state-Brazil. The ornamental fishery in the Guamá River basin is an example of an important activity that supports the families along the river, but it has low social returns and its sustainability is consequently in jeopardy without government aid. We collected fish samples and environmental data to evaluate the market chain aspects, fishery tools and techniques, fish handling and environmental issues of the region. We observed a reduction in numbers of families involved in the ornamental fishery over time. The intensification of anthro- pogenic impacts reduced the environmental integrity degree of fishing sites have resulted in lower fish diversity. The fishery was characterized by capture of a limited number of loricariids fish where the small ones are pre- ferred. Thus the fishing is more selective and consequently an environmental issue. Economically, income is directly associated to the exportation market, consequently the US dollars value influences the species and quantity of the traded fish. Most of the fishermen work on an informal basis and have no intention to continue in this activity due to the low profits reflected by presence of middlemen which concentrates the profit. Therefore, without a management plan for improvement of fishing, environmental and fish quality, the activity presents risks of unsustainability. Suggestions to ensure the perpetuation of this activity are discussed

Protocolo de boas práticas de manejo durante a fase de produção de alevinos de tambaqui na região do Baixo São Francisco AL/SE.

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Benefits of Virgin Coconut Oil in Diet to Colossoma macropomum (Cuvier, 1818).

This study investigated the effects of different dietary levels of virgin coconut oil on growth, body composition, bacterial resistance, and hematology parameters in tambaqui (Colossoma macropomum). Six isolipidic (12% crude lipid) and isonitrogenous (33% CP) diets were formulated adding virgin coconut oil (0%, 25%, 50%, 75%, and 100%) as lipid source, replacing the soybean oil. A positive control diet also prepared containing 15% lauric acid (main fatty acid in virgin coconut oil). Triplicate groups of 20 fish were fed twice daily throughout 90 days. Monthly, we evaluated the tambaqui growth performance, weight and biomass gain, specific growth ratio, apparent feeding conversion, relative condition factor, fish weight uniformity, and final survival. At end of experiment, the fish were subjected to bacterial challenge and blood analysis (glucose, lactate, plasmatic protein, and redcell blood). Fish fed 0%, 100% of VCO and lauric acid presented lower growth than fish fed 50% of virgin coconut oil (VCO) which presents the highest biomass (929:8 ± 80:6a) and weight gain (15:4±4:3a) (p < 0:05). Furthermore, the fish fed 50% and 75% VCO had an increase on body protein (50 and 58%, respectively) without increase body fat content. The values of triglycerides and cholesterol decreased (242:4 ± 39:1c and 181:5 ± 14:6bc) in fish fed 50% VCO and lauric acid, respectively. After bacterial challenge, a hemolytic anemia occurred in fish submitted to diets containing 100% of soybean oil and 100% of VCO, causing 41.67% and 100% of mortality, respectively. However, fish fed with 25 and 50% of VCO not presented any clinical signs of disease or mortality. In conclusion, dietary inclusion of 50% virgin coconut in substitution to soybean oil as a lipid source in diets for C. macropomum is recommended to improve the growth performance, body protein, and resistance against pathogenic bacteria Aeromonas hydrophila

Autochthonous bacterium Lactobacillus plantarum as probiotic supplementation for productive performance and sanitary improvements on clownfish Amphiprion ocellaris.

This current study evaluated the probiotic dietary supplementation with autochthonous bacterium Lactobacillus plantarum for Amphiprion ocellaris. Therefore, it was performed an experiment in complete randomized design with four treatments (T1: Control without probiotic; T2: 104 ; T3: 106 and T4: 108 CFU/g of ration) and three replicates. Juvenile fish (n = 120; 0.46 ± 0.01 g and 0.26 ± 0.06 cm) were distributed in twelve aquarium(80 L) and it received trial meal three times a day at fed rate of 4% live weight during 90 days. The fish were monthly measured and determined the total length, standard length, height, weight gain, biomass gain, specific growth rate, apparently feed conversion, relative condition factor, uniformity and survival. At the end of experiment (90 days) fish were submitted to hematological (n = 9/ treatment; Erythrogram, Leukogram and Thrombogram) and histological analysis (n = 6/ treatment; Intestinal tract). Also, after the supplementation period, the fish were challenged with pathogenic bacteria and the survival and blood analyzed. Results showed the fish fed T3 and T4 had improvement on weight gain, feed conversion, specific growth rate, height and total height from the intestinal villi. Increases of red blood cell (Erythrocyte, hematocrit and hemoglobin) and white blood cell (Lymphocyte and monocyte) also observed to both treatments (T3 and T4), However the T4 promoted the greater fish resistance to pathogenic bacteria. As conclusion, probiotic supplementation with the autochthonous bacterium Lactobacillus plantarum 106 CFU/g provides zootechnical improvement for clownfish rearing, but to improve the pathogenic infection resistance, the 108 CFU/g presented more adequate

Seleção de bactéria espécie-específica com potencial probiótico para o tambaqui.

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