Effect of daily Artemia nauplii concentrations during juvenile production of Lophiosilurus alexandri

Abstract

The aim of this study was to investigate different daily Artemia nauplii concentrations during juvenile production of pacamã, Lophiosilurus alexandri. Six different daily Artemia nauplii concentrations (100, 400, 700, 1,100, 1,400, and 1,600 nauplii larvae -1 ) were tested during 15 days of feeding. The higher growth (weight and length) and lower water quality (higher ammonium ion levels) were registered to the higher initial daily Artemia nauplii concentration. Survival between 90.9 and 99.1% was not influenced by Artemia nauplii concentrations. Different Artemia nauplii concentrations provided high survival and avoided cannibalistic behavior, and initial concentrations of 1,600 nauplii larvae -1 provide higher growth on L. alexandri larviculture.

Growth of Amazon ornamental fish Nannostomus beckfordi larvae (Steindachner, 1876) submitted to different stocking densities and feeding management in captivity conditions

“…According to Abe et al (), the ornamental species Pyrrhulina brevis does not show any alteration in growth with different feeding rates, as was also observed in the present study. During larviculture of another species, 250 nauplii/larvae was an adequate feeding rate for captivity culture of Heros severus (Abe et al, ); however, an increase in the number of Artemia nauplii promoted an improvement in performance, with 900–1600 nauplii being required per larvae of Hoplias lacerdae and Lophiosilurus alexandri (Luz & Portella, ; Santos, Correia & Luz, ).…”

“…Thus, the adequate feeding rate and feeding frequency between species are related to different aspects, such as species’ physiology, behaviour, developmental stage, feeding habit and position within the water column (Jomori et al, ; Luz & Portella, ; Santos et al., ; Zuanon et al, ). The determination of the ideal feeding rate and feeding frequency is important for captivity management, promoting animal welfare, reducing the labour costs, avoiding waste and reducing production costs (Fujimoto et al, ; Santos et al, ; Zhao et al, ).…”

“…In the second experiment, there was a reduction in the water quality due to the high stocking density. This was reflected in the largest dissolved oxygen consumption and the increase in nitrogen compounds produced by the fish (Abe et al, ; Abe et al, ; Luz et al., ; Santos et al, ). In addition to the reduction in water quality, there was also a reduction in the productivity performance as stocking density increased.…”

Effects of feeding rates and feeding frequencies on growth performance, uniformity of the batch and survival rate of Amazon ornamental fish larvae

“…Performance rearing of pacamã (Lophiosilurus alexandri). It is recommended to supply 1600 artemia nauplii larvae -1 divided in three feeds daily, for higher values of weight and total length (Santos et al, 2015). These different results indicate that, although the optimal feeding rate is specie-specific, more effort is needed to determine an optimum feeding practice (EL-Sebaie et al, 2014), especially in first life stages of ornamental fish production.…”

“…The excess of live food also makes the activity more costly (Luz and Portella, 2005;Zuanon et al, 2011). In addition, excess supply of artemia nauplii may promote water quality reduction, since it presents rapid mortality in freshwater (Santos et al, 2015). The appropriate feeding rate is directly related to feeding frequency.…”