Compostos nitrogenados sobre o consumo alimentar de camarão-rosa Farfantepenaeus brasiliensis

Abstract

RESUMO Os experimentos foram realizados para investigar os efeitos da amônia, nitrito e nitrato no consumo alimentar de juvenis de

Effects of ammonia and nitrite on food consumption of the Amazon River prawn Macrobrachium amazonicum (Heller, 1862) postlarvae

“…Nitrite is a common toxic substance in culture systems, and the stress may affect hemocyanin synthesis and energy metabolism, resulting in the prawn's death (Li et al 2019). Moreover, even if they do not cause mortality, they can directly affect growth and food consumption (Tomasso 1994, Campos et al 2013, Maicá et al 2018.…”

“…Knowledge about food consumption is fundamental for food management to avoid excessive administration, which compromises water quality and insufficient supply of food that affects growth (Soares et al 2005). Although studies have shown that food consumption varies according to the weight of prawns, different results among species and experimental conditions have been described (González-Peña et al 2002, Campos et al 2013, Maicá et al 2018.…”

“…Prawn farms have used feed trays to reduce feed costs and maintain adequate water quality for the development of farmed organisms rather than following feeding tables. However, such practice does not prevent the detriment of water quality, and, in both cases, it is essential to know how water quality influences food consumption (Wasielesky Jr. et al 2003, Campos et al 2013). Therefore, this study aimed to evaluate the effects of total ammonia and nitrite on the food consumption of M. amazonicum postlarvae.…”

“…After 24 h, the experimental media were siphoned and filtered in a 30 μm mesh, which was subsequently washed to eliminate feces remains. The feed remains were scraped and placed on laminated paper and then oven-dried at 60°C until reaching constant weight (Campos et al 2013).…”

Addition of sodium nitrite and biofilm in a Litopenaeus vannamei biofloc culture system

“…Particularly, high nitrite concentrations seem to be one of the general problems in biofloc culture facilities. The toxic effects of this compound to shrimp are related to a number of different species, causing effects in metabolism, oxygen and food consumption and, immune function (Liao et al, 2012;Campos et al, 2013Campos et al, , 2014Jiang et al, 2014). In biofloc culture systems, high concentrations of nitrite were reported in many studies (Cohen et al, 2005;Vinatea et al, 2010), and until now, few effective techniques to deal with this problem were found.…”