Description of amino acid and fatty acid content during initial development of Lophiosilurus alexandri (Siluriformes: Pseudopimelodidae), a carnivorous freshwater catfish

Abstract

Samples of eggs, newly hatched larvae (NHL), and larvae at the end of the lecithotrophic period (eight days after hatching) (LPL) of Lophiosilurus alexandri were collected to determine the amino acid and fatty acid profiles. Crude protein did not change throughout initial development and the concentration of lipids was highest in NHL. The content of the indispensable amino acids (IAA) isoleucine, leucine, and valine decreased in LPL, while in eggs and NHL they remained high and similar in value. The dispensable amino acids (DAA), such as aspartic acid, tyrosine, and glycine, increased in LPL, while alanine decreased. The percentage of neutral lipids increased in LPL. The saturated fatty acid content decreased during ontogeny, while monounsaturated fatty acids decreased only in LPL. The polyunsaturated fatty acid content was highest in LP. Polar fatty acids were found in higher percentages in eggs and NHL, but lower in LPL. Saturated fatty acid content decreased during ontogenetic development, while that of monounsaturated fatty acids decreased only in LPL. Polyunsaturated fatty acid content was highest in LPL. Protein content was maintained during ontogenetic development, while amino acid classes experienced changes. Lophiosilurus alexandri preferentially uses saturated and monosaturated fatty acids as an energy source during its early development.

Effect of dietary DHA/EPA ratio on the early development, antioxidant response and lipid metabolism in larvae of Siberia sturgeon (Acipenser baerii, Brandt)

“…MUFA, in particular the 18: 1n‐9, was found to be the major energetic fuel during embryonic development while SFA and HUFA seemed to be conserved. This is also found in three marine caridean species ( Plesionika martia martia , Palaemon serratus and P. elegans ) and a carnivorous freshwater catfish ( Lophiosilurus alexandri ) (Costa et al, ; Morais, Narciso, Calado, Nunes, & Rosa, ).…”

Development, nutrition, and rearing practices of relevant catfish species (Siluriformes) at early stages

“…The early culture of L. alexandri in Brazil is mainly conducted under intensive conditions. Larvae are obtained from natural spawning in tanks with sand in the bottom, where fertilized eggs adhere 174 . Egg masses are collected and incubated in a box (40–150 L of functional volume) with aeration and an internal biological filter.…”

“…Egg masses are collected and incubated in a box (40–150 L of functional volume) with aeration and an internal biological filter. The eggs are generally maintained in a 25‐cm diameter sieve (0.5 mm mesh) fixed to floats, and hatching occurs between 24 and 48 h at 27–28°C 174,175 . Intensive culture of L. alexandri produces larvae during several months of the year, as spawning naturally occurs during 5–6 months.…”

“…Larvae are obtained from natural spawning in tanks with sand in the bottom, where fertilized eggs adhere. 174 Egg masses are collected and incubated in a box (40-150 L of functional volume) with aeration and an internal biological filter. The eggs are generally maintained in a 25-cm diameter sieve (0.5 mm mesh) fixed to floats, and hatching occurs between 24 and 48 h at 27-28°C.…”

Research Article: Proximate composition and amino acid profile of the whole body of juvenile Persian sturgeon (Acipenser persicus)

“…Some peptides and free amino acids function as flavoring materials (Kato et al, 1989), many of which, such as alanine, glycine, and glutamic acid, are responsible for the taste of the food (Yamanaka and Shimada, 1996). Extensive research has been conducted to determine the proximate composition and the amino acid profile of various fish species (Osibona et al, 2006;Nurnadia et al, 2013;Shirai et al, 2002;Mol and Turan, 2008;Gunlu and Gunlu, 2014;Costa et al, 2018); however, very limited data is available on sturgeons' amino acids profiles. The Persian sturgeon (Acipenser persicus) inhabits the southern and southwestern parts of the Caspian Sea, and it is one of the most important species because of its unique ecological and biological features (Afraei et al, 2006).…”