Exploratory study of limnological parameters during the cycle of tambaqui fingerlings

Abstract

As the world population's exponential growth in food security is put at risk, fish farming is one of the economic and effective alternatives in the production of noble and high protein food. For the success the monitoring of the quality of the water during the cycle is fundamental. The present study aimed at the characterization of the limnological parameters in tambaqui nursery (Colosoma macropomum). The study was carried out in the fish farm of Valle del Rio Machado in Presidente Médici - RO, from August/2015 through Junhe/2016, at 08 collection points: water supply and nurseries. The results showed that the parameters such as pH (6.1 to 8.8), ammonia (0.0 to 1.5 mg.L-1), nitrite (0.0 to 0.2 mg.L-1) , turbidity (4.1 to 62.0), were in accordance with what was established by Resolution CONAMA 357/2005; the temperature (28.2 to 38.2 °C), transparency (18 to 70 cm), and alkalinity (10 to 141 mg.L-1) were within the recommended range for fish farming in the specialized literature; dissolved oxygen ranged from 0.8 to 5.2 mg.L-1, but most of the sampled points were below 5 mg.L-1, the electrical conductivity ranging from 51.9 to 178.2 μS.cm-1 above that established by Resolution 357/2005/CONAMA. According to the results, the nurseries with cascade supply, receiving the same management are directly affected and there is thus the need for reformulation of the system in fish farming, so that it remains with individual supply and drainage.

Temporal analysis and evolution of fish farming in Alto Paraíso municipality, RO, Western Amazon, Brazil

“…In order to support the flow of production (Rocha, 2015). Nonetheless, there are some exceptions of agglomerations of fish farms implemented according to water resources, especially in Central-East region of Rondônia state along the Machado river (Krusche et al, 2005;Figueiredo et al, 2018;Hurtado et al, 2018;Pontuschka et al, 2021). As well as fish farms and small fishing ports, in Vale do Guaporé region (is also located in Rondônia state) along the Guaporé river (Adami, 2013;Freitas et al, 2016).…”

Effects of Prolonged Fasting and Refeeding on Metabolic, Physiological, Tissue, and Growth Performance Adjustments in Colossoma macropomum

“…These values were measured using a digital oximeter (YSI EcoSense ® -DO200A, Yellow Springs, USA), pH 8.24 ± 0.43 was measured using a pH meter (KASVI ® -model K39, São José dos Pinhais, Brazil), and the total ammonia (0.10 ± 0.12 mg/L) was measured using a commercial kit (Bioclin ® , Belo Horizonte, Brazil). The limnological conditions of the experiment were in accordance with the requirements of the species in a growing environment [27,28].…”