# The effects of the inclusion of jabuticaba peel flour on performance, metabolism, and its influence on the skin color of Carassius auratus

## TL;DR

This study shows that adding jabuticaba peel flour to fish feed can improve growth and skin color in goldfish.

## Contribution

The study introduces jabuticaba peel flour as a novel feed additive that enhances fish performance and skin color.

## Key findings

- Inclusion of jabuticaba peel flour improved feed intake and growth rate in Carassius auratus.
- Fish fed with jabuticaba peel flour showed increased skin brightness and yellow shades.
- Jabuticaba peel flour reduced liver enzyme activity, suggesting protective effects on liver health.

## Abstract

This work aimed to evaluate the inclusion of jabuticaba peel flour (JPF) in skin color and productive performance, biochemical, blood, and enzymatic parameters of Carassius auratus. 72 fish (weight 9.67 ± 0.37 g, length 7.38 ± 0.18 cm) were distributed into four treatments (0.00; 1.00; 1.50 and 2.00% JPF), in a completely randomized design with three replications with six fish per box. After 60 days, to evaluate the performance of the fish. To assess the skin color of the fish, a portable photo colorimeter was used using the Hunter coordinate system, where the coordinates of L*, a*, and b*. Blood samples were taken for biochemical analysis regarding glucose, triglycerides, and cholesterol. The analysis of ALT and AST, albumin and triglycerides in liver tissue, and amylase, lipase, nonspecific protease, and alkaline phosphatase in the intestine. Results obtained showed that there was a significant difference about feed intake and specific growth rate with the inclusion of JPF. It was observed that fish fed with 1.00 and 1.50% JPF obtained an increase in brightness represented by the L coordinate and shades of yellow represented by the b coordinate. Glucose increased with 2.00% of JPF. AST activity was higher with 1.00% JPF and ALT was reduced with the inclusion of JPF, demonstrating an ability to protect against possible liver damage. The inclusion of JPF is effective at levels of up to 1.5% to increase the brightness of the skin of Carassius auratus.