Excreção de amônia por tambaqui (Colossoma macropomum) de acordo com variações na temperatura da água e massa do peixe

Abstract

Resumo -A amônia, produto de excreção dos peixes, é tóxica para organismos aquáticos. O objetivo deste trabalho foi quantificar taxas de excreção diária de amônia em tambaqui (Colossoma macropomum), principal espécie criada na Amazônia, que podem variar de acordo com a temperatura da água e a massa dos peixes. As taxas de excreção foram determinadas a cada 2 horas por um período de 24 horas e os resultados analisados por uma regressão linear múltipla. O tambaqui apresentou de dois a cinco picos de atividade de excreção durante 24 horas, caracterizados por rápidos aumentos de até dez vezes na taxa horária de excreção. O modelo desenvolvido pela regressão linear múltipla explicou 95,2% da taxa diária de excreção de amônia, que aumentou com a massa do peixe, mas diminuiu com o aumento da temperatura da água.Termos para indexação: qualidade da água, ambiente de criação, produtos nitrogenados, peso, proteína. Ammonia excretion by tambaqui (Colossoma macropomum) related to water temperature and fish massAbstract -Ammonia, an excretion product of fish, is toxic to aquatic organisms. The objective of this study was to account daily ammonia excretion rates of tambaqui (Colossoma macropomum), the main fish species of the Amazonia related to water temperature and fish mass. Ammonia excretion rates were measured every two hours during a 24-hour period and results were evaluated by a multiple linear regression. Tambaqui presented two to five excretion peaks during the 24-hour period, reaching up to ten times the mean excretion rates. The model developed by the multiple linear regression explained 95.2% of the daily ammonia excretion rates, which increased according to fish mass and decreased when water temperature increased.

Water pH and urinary excretion in silver catfish Rhamdia quelen

“…The decrease in volume, ammonia, Na + , Cl − and K + urinary excretion with the increase of silver catfish body mass corroborates with those results found in walleye Sander vitreus (Mitchill) (Yager & Summerfelt, 1993), and tambaqui Colossoma macropomum (Cuvier) (Ismiño‐Orbe et al , 2003). In addition, the decline in oxygen consumption (and consequently, metabolism) per unit of body mass that accompanies an increase in body size has been attributed, in part, to ontogenetic changes in the ‘metabolic intensities’ of the different tissues, which tend to decline as fish increase in size (Jobling, 1994).…”

Performance of juvenile turbot (Scophthalmus maximus) fed varying dietary L-carnitine levels at different stocking densities

“…The rates of postprandial TAN excretion recorded for juvenile turbot rest within the range reported for other species (Robaina et al, 1999;Ismiño-Orbe et al, 2003;Gómez-Requeni et al, 2003;Webb Jr. and Gatlin III, 2003). TAN excretion peaked at approximately 4 h after a single meal and slowly decreased to values lower than the prefeeding level.…”

Parasite-host relationship between the tambaqui (Colossoma macropomum Cuvier 1818) and ectoparasites, collected from fish farms in the city of Rolim de Moura, State of Rondônia, Western Amazon, Brazil

“…The tambaqui is resistant to the toxic effect of ammonia, and concentrations up to 0.46 mgL -1 of non-ionized ammonia (ammonia toxic state) do not compromise the growth of the species (Ismiño-Orbe et al 2003). We believe that the values observed in this study did not affect the development of the fish.…”