Densidades de estocagem para tilápia do Nilo em sistema aquapônico de Raft
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2021-12-10
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Universidade Federal de Goiás
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This work was developed with the aim of comparing the productive performance, economic evaluation, yields and body and chemical composition of the fillet, blood biochemistry of Nile tilapia, productive performance of lettuces and chemical composition, in addition to the interaction of water quality parameters between lettuce, fish and water. The experiment was conducted in the Aquaculture Sector at the Veterinary and Zootechnics School - EVZ, from the Federal University of Goiás - UFG, from December 2020 to March 2021 (80 days). A total of 648 fish were used, divided into two periods of 40 days each (period I: 234 fish and period II: 234 fish), randomly distributed in 12 masonry tanks with 6 m², in two densities (3 fish per m² and 6 fish per m²). m²). The experimental design was completely randomized in four treatments with 3 replications each, where T1: 3 fish per m² together with lettuce production, T2: 6 fish per m² with lettuce production, T3: 3 fish per m² without lettuce, T4 : 6 fish per m² without lettuce with 3 repetitions each, totaling 12 experimental units, and the same experiment was repeated in time, in order to better evaluate density and the interaction of vegetables within the same system. The fish were fed with commercial feed containing 32% CP at a frequency of three times a day. The variables of productive performance were analyzed (survival rate, average weight, biomass, individual weight gain, apparent feed consumption, apparent feed conversion, protein efficiency rate and specific growth rate), economic evaluation (partial operating cost, gross, partial net revenue, incidence of costs), body yields (head proportion, carcass yield, viscera proportion and fillet yield), fillet chemical composition (dry matter, crude protein, ethereal extract, mineral matter), analysis bromatology of lettuce (dry matter, crude protein, mineral matter) biometric indices (hepatosomatic index and viscerosomatic fat index), hemato-immunological (red blood cells, hemoglobin, hematocrit, MCV, HCM, CHCM, thrombocytes, leukocytes, heterophils, eosinophils, lymphocytes and monocytes). Data were submitted to double factor statistical analysis. It was observed that the experimental units that in the density of 6 fish per square meter with the presence of lettuce provided better results, zootechnical, hemato-immunological data and also better economic viability.
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MORAES, A. P. Densidades de estocagem para tilápia do Nilo em sistema aquapônico de raft. 2022. 71 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2021.