Banca de DEFESA: KLEYDSON THYAGO ARAUJO DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KLEYDSON THYAGO ARAUJO DE OLIVEIRA
DATE: 29/08/2025
TIME: 14:00
LOCAL: Departamento de Zootecnia
TITLE:

Influence of different levels of natural astaxanthin on zootechnical, biochemical and reproductive parameters in Oreochromis niloticus

KEY WORDS:

aquaculture; growth performance; antioxidants; broodstock nutrition

PAGES: 42
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Nutrição e Alimentação Animal
SPECIALTY: Avaliação de Alimentos para Animais
SUMMARY:

This study evaluated the effects of dietary astaxanthin (0, 50, 100, and 150 mg/kg feed) on growth, antioxidant response, and gonadal development in Nile tilapia (Oreochromis niloticus) broodstock. A 45-day trial was conducted with 144 non-sex-reversed juveniles distributed in 16 tanks. Results showed no significant effects on growth performance (weight gain, feed conversion ratio) or oxidative stress markers (MDA, CAT, GSH). However, females fed 50 mg/kg exhibited higher trypsin and lipase activity, indicating improved nutrient absorption for reproduction. Gonadal histology revealed advanced maturation stages (IV-V) in females receiving 100-150 mg/kg. Hematological parameters remained stable, except for reduced lymphocytes in high-dose females. In conclusion, while astaxanthin did not enhance growth, it may improve reproductive maturation in females, supporting its use as a functional additive in tilapia aquaculture.

COMMITTEE MEMBERS:
Presidente - MARIA DO CARMO MOHAUPT MARQUES LUDKE
Interno - CARLOS BOA VIAGEM RABELLO
Externo à Instituição - MARCOS JOSÉ BATISTA DOS SANTOS