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Protective effect of Terminalia catappa leaf extracts against Saprolegniosis on angelfish eggs

2021; Wiley; Volume: 53; Issue: 2 Linguagem: Inglês

10.1111/are.15579

1365-2109

Juliana Oliveira Meneses, Izadora Cibely Alves da Silva, Ana Flávia Santos da Cunha, Fernanda Santos Cunha, Joel Artur Rodrigues Dias, Higo Andrade Abe, Peterson Emmanuel Guimarães Paixão, Natalino da Costa Sousa, Márcia Valéria Silva do Couto, Bruno S. Lima, Antônio Guilherme Carvalho Neto, Adriano Antunes de Souza Araújo, Luiz Pereira da Costa, Francisco José dos Santos, Juliana Cordeiro Cardoso, Leandro Eugênio Cardamone Diniz, Rodrigo Yudi Fujimoto,

Parasite Biology and Host Interactions

The Saprolegniosis causes major reduction egg hatching rate by angelfish (Pterophyllum scalare); therefore, we investigated the effectiveness of two Terminalia catappa extracts (27 ℃ and 80 ℃) against S. parasitica on fish eggs. Mycelium growth was evaluated in vitro at 0, 2.5, 5.0 and 10 g/L for 96 h, in solid and liquid medium culture. In an in vivo assay, we tested lower concentrations of hot extract (25, 50 and 100 mg/L) to prevent infection by zoospores. The hot aqueous extract was the most effective, and the concentrations of 5 and 10 g/L demonstrated great efficiency in liquid medium. In vivo conditions, 50 and 100 mg/L of hot extract provided more viable eggs, greater percentage of total larvae and lower percentage of infected eggs. Thus, the hot extract should be used instead of the room-temperature extract as a prophylactic measure, to prevent saprolegniosis in P. scalare eggs and improving the hatching rate.