Tecnologias Químicas em Aquacultura Extensiva

Francisco João Grilo Mota

Key information

Authors:

Francisco João Grilo Mota (Francisco João Grilo Mota)

Supervisors:

Abílio Manuel Ferreira (Abílio Manuel Ferreira); João Carlos Moura Bordado (João Carlos Moura Bordado)

Published in

December 9, 2021

Abstract

The creation of an aquaculture facility with water treatment through ozone and temperature control through use of PCMs in the range of 16ºC to 20ºC was suggested for the purpose of growing fish in extensive regime. According to decreto-lei nº236/98, the require parametres for the growth of fish were obtained which allowed to pick the necessary tools to the maintenance of said values. It become possible to develop a project to obtain the license for the installment of an aquaculture facility in a proper place, in Gâmbia, Setúbal. An evaluation regarding ozone and its effects on the water of an aquaculture facility was made, which allowed the construction of a low-budget, homemade ozonizer. This device was used on samples of water from a neighbour semi-intensive aquaculture. The values obtained were in the order of the 42 000ppm. As a follow-up, analyses to the nitrates, nitrites and pH of the aquaculture mentioned in the project with the goal to determine which would be the best treatments and technologies to utilize in the facility. The values obtained were 0ppm, 0ppm and the range of 7,8-8,2 for the nitrates, nitrites and pH, respectively. According to the obtained values, the conditions are favorable to the growth of fish in the mentioned facility, in extensive regime.