Atividade de enzimas digestivas e parâmetros de crescimento de juvenis de jundiá (Rhamdia quelen) alimentados com farelo de linhaça in natura e demucilada

Abstract

This study was conducted out to evaluate the effect of partial replacement of animal protein (PBOA) for crude protein demucilaged linseed meal (PBFLD) and in nature (PBFL) ± 1.85 g) were reared in water recirculation system and fed to apparent satiation three times a day. At the end experimental parameters were evaluated for growth, carcass, chemical composition in whole fish and digestive enzymes. The fish fed control diet had best levels of feed conversion (p <0.05), however the remainder of the growth parameters were not altered by the inclusion of FL and FLD. There were no significant differences in hepatosomatic relation (RHS) and digestivosomatic relation (RDS). Diet 35%FLD had a lower intestinal quotient (QI), moisture content and higher carcass fat, total fat deposited and activity of the enzyme trypsin. It can be concluded that the FLD and FL can be used as a substitute of meat meal to the diets in juvenile jundia feed as an alternative source and cost.

Evaluation of oregano essential oil as a growth promoter and resistance stimulator against Ichthyophthirius multifiliis (Protozoa, Ciliophora) in silver catfish juveniles, Rhamdia sp. (Siluriformes, Heptapteridae)

“…In studies with silver catfish juveniles of similar size, no significant differences were observed for these parameters either, but higher mean values of HSI (1.5 to 1.7%) and lower CY (84.3 to 86.4%) were obtained by Lovatto et al (2014) and Goulart et al (2013), respectively.…”

“…Feed conversion (1.40 to 1.56) and specific growth rate (1.62 to 1.89%) were slightly worse than mean values of FC (1.3) and SGR (2.3%) presented by juveniles of R. quelen with initial weight of 14.5 g, fed different dietary levels of linseed for seven weeks (GOULART et al, 2013). However, the inferior results verified here might be related to a longer experimental period, which was almost twice longer than that of the aforementioned study.…”

Fish meal replaced by hydrolysed soybean meal in diets increases growth and improves the antioxidant defense system of silver catfish ( Rhamdia quelen )

“…The provision of diets containing up to 20% of HSM improved the growth of silver catfish without impairing food efficiency. Silver catfish is able to take advantage of different plant protein sources in the diet (Dalcin et al, ; Gourlat et al, ; Lovatto et al, ). High inclusion levels of plant protein sources in the diets leads to deficiency of essential amino acids and may compromise growth (Gatlin et al, ).…”

Effect of supplementation of dietary fibre concentrates on biochemical parameters, stress response, immune response and skin mucus of jundiá (Rhamdia quelen )

“…Mucilage was obtained from the grain of linseed in an aqueous medium at a 10% w/v concentration, at a temperature of 60 to 80°C with constant stirring, for 150 min, based on the methodology described by Goulart et al. (). Pectin was produced from citrus pulp in an aqueous medium under average temperature of 100°C, according to the methodology described by Calliari ().…”