Fishmeal substitution for Arthrospira platensis in juvenile mullet (Mugil liza) and its effects on growth and non-specific immune parameters

  • Victor Torres Rosas Universidade Federal do Rio Grande (FURG)
  • Martin Bessonart Universidad de la República Uruguay (UDeLaR)
  • Luis Alberto Romano Universidade Federal do Rio Grande (FURG)
  • Marcelo Borges Tesser Universidade Federal do Rio Grande (FURG)

Abstract

Background: Cyanobacterium Athrospira platensis (Spirulina) is a potential fishmeal (FM) substitute in fish diets because of its high protein content, antioxidant and immunostimulant properties. Objective: To evaluate the effects of total and partial substitution of FM with A. platensis (0, 30, 50, 70 and 100% substitution) in juvenile mullet (Mugil liza). Methods: Juvenile mullets (n=210) were maintained in a recirculation system under optimal water parameters for the species. Mullets were fed five experimental diets for 80 days. Each diet was tested in triplicate tanks. At the end of the experimental period growth parameters were measured and samples of blood, liver and spleen were taken to evaluate the immune system. Results: Full replacement (100%) of FM resulted in growth deficits and low survival. The FM replacement induced changes in the proportion of macrophages and lymphocytes. Up to 50% FM replacement increased the expression of CD3 receptors in spleen T lymphocytes (T-Cells), whereas >50% FM replacement decreased the expression of CD3 receptors. We also found that partial FM substitution diminished the apoptotic process. Conclusions: Up to 50% FM substitution with A. platensis can improve performance of non-specific immune system of mullets.

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Author Biographies

Victor Torres Rosas, Universidade Federal do Rio Grande (FURG)

Laboratório de Nutrição de Organismos Aquáticos, Instituto de Oceanografia (IO), Universidade Federal do Rio Grande (FURG), Rio Grande, Brasil.

Martin Bessonart, Universidad de la República Uruguay (UDeLaR)
  • Laboratorio de Recursos Naturales Facultad de Ciencias - UDeLaR, Montevideo, Uruguay
  • Estación Experimental de Investigaciones Marinas y Acuicultura, DINARA, Cabo Polonio, Uruguay
Luis Alberto Romano, Universidade Federal do Rio Grande (FURG)
Laboratório de Patologia e Imunologia de Organismos Aquáticos, Instituto de Oceanografia (IO), Universidade Federal do Rio Grande (FURG), Rio Grande, Brasil.
Marcelo Borges Tesser, Universidade Federal do Rio Grande (FURG)
Laboratório de Nutrição de Organismos Aquáticos, Instituto de Oceanografia (IO), Universidade Federal do Rio Grande (FURG), Rio Grande, Brasil
Published
2019-03-27
Section
Original research articles