Spatial dynamics of the physical and chemical parameters of water in fish farms
Journal Title: Revista Verde de Agroecologia e Desenvolvimento Sustentável - Year 2017, Vol 12, Issue 3
Abstract
Brazil presents, characteristics that can make of its territory, the world's great barn for the production of cultivated fish organisms. However, for this it is fundamental to study the physical and chemical parameters of the water in the growing areas, so that strategies can be sought to avoid handling errors. The aim of this study was to evaluate the spatial dynamics of the physical and chemical parameters of fish pond water and their relationship of dependence. The study was carried out in a nursery excavated on natural land, located on a property, adjacent to the experimental farm of the Veterinary Medicine and Animal Science School, Federal University of Tocantins, in the municipality of Araguaína. The points for collection on the grid were obtained by GPS, considering the size of the total area. In each georeferenced point samplings were performed in two different depths, one 20 cm from the tank bottom (depth first) and the other at 20 cm from the water surface (depth 2) totaling 108 samples. There was major variation between depths for most variables. Descriptive statistics was observed moderate variation coefficient only for dissolved oxygen. In the analysis of semivariograms, only the variable electrical conductivity showed pure nugget effect. spatial dependence was found between the variables at both depths. The mesh used was effective in showing the spatial distribution of physical - chemical parameters: dissolved oxygen, water temperature and pH, but it was not useful for electrical conductivity, given its low spatial variability. The physical and chemical parameters of the water of the fish ponds are influenced by the management practices, being easily detected through the isoline maps.
Authors and Affiliations
José Mário Lopes da Rocha, Danilo Gomes de Oliveira, Antonio Clementino dos Santos, Otacilio Silveira Júnior, Elisson Gomes da Silva, Caio Leonardo Silva Ferreira
Keywords
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- EP ID EP254046
- DOI 10.18378/rvads.v12i3.4844
- Views 97
- Downloads 0
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