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Effects of biofloc technology on reproduction and ovarian recrudescence in Nile tilapia
Authors:Érika Ramos de Alvarenga  Suellen Cristina Moreira de Sales  Túlio Soares de Brito  Cláudia Regina Santos  Rebeca Dias Serafim Corrêa  Gabriel Francisco de Oliveira Alves  Ludson Guimarães Manduca  Eduardo Maldonado Turra
Affiliation:Laboratório de Aquacultura (LAQUA), Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
Abstract:The objectives of this study were to evaluate the reproductive cycle, morphological changes of ovary and mobilization of energy reserves in Nile tilapia reared with biofloc technology (BFT). In general, the growth and reproductive performance were highly similar between BFT and Control system (clear water). Difference between the systems was found in the hepatosomatic index (using mixed‐effects models), which suggested that BFT can alter the energy mobilization in the post‐spawning period. The absolute and relative fecundity, fertilization rate, number of larvae produced per female, gonadosomatic index, proportion of oogenesis cells, number of post‐ovulatory and atretic follicles were similar between the two systems. We also did not detect a reduction in the reproductive cycle length in Nile tilapia reared in BFT. Because there was no evidence of the negative effects of BFT on Nile tilapia reproduction, we concluded that BFT might be used for breeder stocking of this species.
Keywords:biofloc technology     Oreochromis niloticus     ovary morphometry  post‐spawn period
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