Effects of the use of synthetic astaxanthin in the feeding of Lophiosilurus alexandri, a neotropical siluriform fish

Abstract

Aiming to test the capacity of retention of carotenoids in tissues, Lophiosilurus alexandri juveniles were fed diets containing 0, 25, 50, 100, 200, and 400 mg/kg of synthetic astaxanthin for 62 days. The inclusion of astaxanthin did not result in significant differences in growth, weight gain, apparent feed conversion, and feed efficiency of the fish. Blood biochemistry and liver histology did not change with the different treatments.At the level of 100 mg/kg of inclusion, there were the highest levels of carotenoids in the blood, and muscle and the smallest difference between the muscle x integument ratio.

Effects of dietary astaxanthin on growth performance, immunity, and tissue composition in largemouth bass, Micropterus salmoides

“…consistent with studies on some species, such as 150 mg/kg for Asian seabass (Lates calcarifer) (Lim et al, 2019), and 100 mg/kg for swordtail fish (Xiphophorus helleri) (Rashidian et al, 2020). However, several studies also showed that the addition of astaxanthin has no effect on the growth performance of certain species, such as catfish (Lophiosilurus alexandri) (Costa et al, 2022) and coral trout (Plectropomus leopardus) (Zhu et al, 2022).…”