Tolerância de juvenis de pirarucu ao aumento da concentração de amônia em ambiente confinado

Abstract

Resumo -O objetivo deste trabalho foi avaliar a tolerância de juvenis de pirarucu, Arapaima gigas, a concentrações crescentes de amônia na água. Oito peixes (2,6±0,4 kg e 70,5±4,1 cm de comprimento) foram distribuídos aleatoriamente em quatro tanques (0,8x0,9x2,6 m) com 410 L de água tamponada com Na 2 PO 4 e HCl, ambos a 0,1 M, onde ficaram por 33 dias. As concentrações de amônia no plasma sanguíneo dos peixes e na água foram determinadas pelo método do salicilato. A glicose plasmática e os níveis de amônia aumentaram proporcionalmente à concentração de amônia na água. Juvenis de pirarucu toleram altas concentrações de amônia na água.Termos para indexação: Arapaima gigas, fisiologia de peixes, piscicultura. Tolerance of pirarucu juveniles to increasing ammonia concentration in a closed environmentAbstract -The objective of this work was to evaluate the tolerance of pirarucu (Arapaima gigas) juveniles to increasing concentrations of ammonia in the water. Eight fish (2.6±0.4 kg and 70.5±4.1 cm length) were evenly distributed in four tanks (0.8x0.9x2.6 m) with 410 L of water buffered with Na 2 PO 4 (0.1 M) and HCl (0.1 M), where they were kept for 33 days. Ammonia concentrations in the fish blood plasma and in the water were determined by the salicilate method. Plasma glucose and ammonia levels increased proportionally to the concentration of ammonia in the water. Pirarucu juveniles tolerate high concentrations of ammonia in the water.

Tolerance to temperature, pH, ammonia and nitrite in cardinal tetra, Paracheirodon axelrodi, an amazonian ornamental fish

“…This fact explains the wide range of results obtained in several studies. Cavero et al (2004) have exposed young Arapaima gigas to a concentration of 25 mg/L NH 3 + NH 4 + or 2 mg/L NH 3 for 24 hours and no effect was observed on fish survival or performance. The toxicity of nitrite to fish has received much attention in recent years, but little information is available on the susceptibility of tropical fish to this compound (Moraes et al, 1998;Martinez & Souza, 2002;Costa et al, 2004).…”

<b>Water quality and survival rate of <i>Rhamdia quelen</i> fry subjected to simulated transportation at different stock densities and temperatures

“…Ammonia is the main product excreted by fish (Bolner et al, 2014), including R. quelen (Golombieski et al, 2013), and at high concentration compromises the metabolism, alters growth, and can lead to death (Cavero et al, 2004). Recently, Pottinger (2017) raised an issue that possibly ammonia, nitrate and nitrite influence the function of the stress axis in fish, alone or in combination.…”

LD5o of the bacteria Aeromonas hydrophila to matrinxã, Brycon amazonicus

“…This control should be even more stringent when determining the tolerance of a given species to a stressor agent, in order to assure reliable results, which dictate the animal tolerance limits (Lima 2003;Avilez et al 2004;Cavero et al 2004). For example, studies involving Piaractus mesopotamicus indicate that water temperature seems to have an influence on the mortality rates caused by A. hydrophila and septicemia outbreaks are associated with high water temperatures (Garcia et al 2009).…”