EVALUATION OF FISH DEVELOPMENT IN CIRCULAR TANKS OF CEMENT PLATES WITH INTEGRATION TO PRODUCTIVE BACKYARDS

Abstract

The objective of this study was to evaluate the development of fish cultivated in circular tanks of cement plates, observing parameters such as growth rate, weight, health of organisms and economic viability of the practice. The study was carried out in the experimental area of Agrarian Diseases of the Federal Institute of Pará – Bragança Campus. The research involved a tilapia cultivation system in circular tanks of cement plates, with average diameters of 6 meters and depth of 1.30 meters in the central area. The tank was integrated into an urban productive backyard, with vegetable cultivation and an agroforestry system in the experimental area. Fish growth was monitored over six months, with periodic assessments of weight and length and parameters such as temperature, pH, dissolved oxygen, ammonia and nitrite will be monitored weekly, using appropriate analysis kits. The quality of the water was monitored to ensure adequate conditions for the cultivation of fish and to assess the impact of integration with the productive backyard. Variations in fish parameters and water quality were investigated by applying trend lines over time. These lines followed the linear and quadratic models depending on the fit to the data provided by the parameter R². The length of the fish increased over time, starting at an average of 19.5 mm and reaching an average of 28.7 mm. The weight of the fish increased throughout the experiment, with an initial average weight of 314.6 g and a final weight of 1,038.5 kg.