Rearing and maturation of Lophiosilurus alexandri (Steindachner, 1876) in controlled conditions: First reports and future perspective

Influence of sex and age on biochemical parameters of Lophiosilurus alexandri (Steindachner, 1876): First results

“…The present study found that both sexes experienced an increase in this metabolite by 845 DAH followed by a decrease by 968 DAH. This oscillation was inversely proportional to the variation in estradiol and testosterone levels observed by Melillo‐Filho et al (2020) for L. alexandri at the same age. These findings may indicate mobilization of energy reserves for the sexual maturation process of this species.…”

“…These findings may indicate mobilization of energy reserves for the sexual maturation process of this species. The glucose reduction observed beginning at 481 DAH confirms a greater energy demand that coincides with advanced gonadal maturation at these ages (Melillo‐Filho et al, 2020).…”

“…As there was no reproduction or sexual maturation of the females during these periods (Melillo Filho et al, 2020), such variation cannot be attributed to gonadal development or spawning. Magnesium at 481 DAH and ALT at 372 DAH were also higher for male than females fish.…”

“…However, despite being fundamental to understanding this type of variation, studies that correlate behaviour between the sexes with metabolic rate in fish are scarce (Metcalfe et al, 2016). As there was no reproduction or sexual maturation of the females during these periods (Melillo Filho et al, 2020), such variation cannot be attributed to gonadal development or spawning. Magnesium at 481 DAH and ALT at 372 DAH were also higher for male than females fish.…”