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- Title
Protective effect of Terminalia catappa leaf extracts against Saprolegniosis on angelfish eggs.
- Authors
Meneses, Juliana Oliveira; da Silva, Izadora Cibely Alves; da Cunha, Ana Flávia Santos; dos Santos Cunha, Fernanda; Dias, Joel Artur Rodrigues; Abe, Higo Andrade; Paixão, Peterson Emmanuel Guimarães; da Costa Sousa, Natalino; do Couto, Márcia Valéria Silva; dos Santos Lima, Bruno; de Carvalho Neto, Antônio Guilherme; de Souza Araújo, Adriano Antunes; da Costa, Luiz Pereira; dos Santos, Francisco José; Cardoso, Juliana Cordeiro; Diniz, Leandro Eugenio Cardamone; Fujimoto, Rodrigo Yudi
- Abstract
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.
- Subjects
FISH eggs; TERMINALIA; EGGS; EXTRACTS; PARASITIC wasps
- Publication
Aquaculture Research, 2022, Vol 53, Issue 2, p377
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/are.15579