Pirarucu larviculture in green water provides heavier fish and modulates locomotor activity

ABSTRACT The green water technique uses microalgae in the of indoor larviculture, providing a darker environment to favor fish growth, welfare and health. We evaluated growth performance locomotor activity after light exposure pirarucu (Arapaima gigas) larvae reared or clear water. During one test, (3.6 ± 0.3 cm; 0.36 0.1 g) were 50-L circular tanks (n = 3 per treatment, 50 tank) static system containing [microalgae (w3algae; Bernaqua® 10 g m-3) added] (control). Fish weaning was achieved by co-feeding with Artemia nauplii microdiets for seven days until full microdiet substitution. Larvae biometrically on 10, 17 24 assess performance. In second analyzed before (1400 60 lx) 48 h according an ethogram. After days, significantly heavier than those from water, displayed fewer swimming movements. Body cortisol increased both groups exposure. provided additional food source larvae, positive impact day larviculture. Green can be strategy achieve better results especially during up period.