Abstract
The aimed of the study was to evaluate the effect of continuous artificial aeration on zootechnical performance, hematological characteristics and glucose concentration of tambaqui (Colossoma macropomum) cultivated in a system without water flow. The study was conducted with two treatments, with aeration and without artificial aeration. Were 600 tambaqui juveniles with an average initial weight of 15 ± 0.15g were distributed in two excavated tanks. Thirty fish were captured per cultivation unit to perform monthly biometric measurements and were subjected to blood collection to determine hematological parameters. There was no difference between hematological variables (p<0.05). However, the continuous use of artificial aeration provided fish with more comfortable conditions, resulting in greater performance (p<0.05) in up to 90 days of cultivation, with an average daily weight gain of 4.82 g compared to 4.49g to the system without artificial aeration. It can be inferred that fish grown in a system without artificial aeration presented, when compared to those raised in a system with continuous artificial aeration, smaller values (p<0.05) of growth, both in weight and in length, consequently the continuous use of the aerator provided favorable conditions for the fish, resulting in average daily weight gain and total biomass gain.
Highlights
Several native Brazilian fish arouse the interest of fish farmers and researchers due to the characteristics of fast growth, high feeding efficiency, ease of induced reproduction and characteristics appropriate to cultivation (Chamy et al., 2015)
The consumption of fish in Brazil grows, surpassing the annual per capita consumption of 14 kg per inhabitant, which surpassed that recommended by the World Health Organization (WHO), 12 kg per inhabitant per year (FAO, 2018)
The averages of the water temperature and the concentration of oxygen dissolved in water (ODW) in the cultivation phases, showed a significant difference between the nurseries with aeration and without aeration
Summary
Several native Brazilian fish arouse the interest of fish farmers and researchers due to the characteristics of fast growth, high feeding efficiency, ease of induced reproduction and characteristics appropriate to cultivation (Chamy et al., 2015). Among the fish native to the Amazon, tambaqui (Colossom macropomum Cuvier, 1018) stands out, which is the most cultivated fish species in the Amazon region (Cavali et al, 2020). Other factors that motivated the creation of C. macropomum in the Amazon, were the easy obtaining of juveniles, the high growth potential, the use of primary natural food, and the high productivity and rusticity (Chamy et al, 2015; Martins et al, 2020). The growing demand for commercially sized fish has contributed to the development of fish farming (Martins et al, 2020)
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