Efeito da densidade de estocagem no bem-estar de duas espécies de peixes ornamentais Cyprinus carpus var. koi E Betta splendens

Abstract

The cultivation of aquatic organisms for ornamental purposes is a promising aspect for aquaculture. Among the fish used for ornamental purposes, the species of colored carp (Cyprinus carpio var koi) and beta (Betta splendens) have economic importance for aquaculture, being the most commercialized ornamental fish in Brazil and in the world. The aim of the present study was to assess whether the main volumes of the beta species (Bettas splendens) and colored carp (Cyprinus carpio var koi) are conditioned in aquarium stores that are appropriate for the species and may be impairing well-being. of the animals. The study was divided into two stages, both in a completely randomized design, with six treatments (5,10,20,30,45 and 90 L / animal) in quadruplicate for carp and five treatments (150, 500, 1,000, 5,000 and 10,000 mL / animal) and ten repetitions for the beta. The two stages lasted 30 days and were analyzed for behavior, histology of liver and gills, water quality parameters, biochemical and blood parameters. In relation to betas, treatments 150 and 500 mL showed the worst values for water parameters, and for most biochemical parameters. Regarding carp, the two most densified volumes (5 and 10 L) showed constant fights and changes in water parameters. The highest values for blood parameters were reached between 50 and 70 L / animal. The volume of packaging influences the well-being of colored carp and beta, so several stores have packed these animals in volumes unsuitable for trade. It is recommended to pack the adult male betta ornamental fish and colored carp of 15 cm in containers containing a minimum of 01 L and 30 to 45 L of water / animal, respectively.