Gonadal morphology and difference in reproductive development of two isolated populations of Astyanax rivularis (Teleostei, Characidae)

Author(s)

Quirino, Patricia Postingel ^{[1, 2]} ; Siqueira-Silva, Diogenes Henrique ^[3] ; Rodrigues, Maira Silva ^[4] ; Santos-Silva, Amanda Pereira ^[5] ; Ribeiro Delgado, Maria Luiza ^{[1, 2]} ; Senhorini, Jose Augusto ^[5] ; Ninhaus-Silveira, Alexandre ^[1] ; Verissimo-Silveira, Rosicleire ^[1]

Affiliation

^[1] Univ Estadual Paulista, Lab Neotrop Ichthyol, Campus Ilha Solteira, Ilha Solteira - Brazil

^[2] Inst Biosci, Grad Program Biol Sci Zool, R Prof Dr Antonio Celso Wagner Zanin, Botucatu, SP - Brazil

^[3] Univ Fed Sul & Sudeste Para, Res Grp Reprod Amazon Fish, Inst Estudo Saude & Biol, Maraba - Brazil

^[4] Univ Estadual Paulista, Dept Struct & Funct Biol, Reprod & Mol Biol Grp, Inst Biosci, R Prof Dr Antonio Celso Wagner Zanin, Botucatu, SP - Brazil

^[5] Chico Mendes Inst Biodivers Conservat, Natl Ctr Res & Conservat Continental Fish, Pirassunung - Brazil

• Document type: Journal article
• Source: Journal of Fish Biology; v. 99, n. 5 AUG 2021.
• Web of Science Citations: 0

Abstract

Individuals of the same species may present different reproductive tactics depending on the environment in which they develop and mature. The present study aimed to define the gonadal development phases of males and females of Astyanax rivularis and to carry out a comparative analysis of the reproductive development of specimens captured in two isolated environments of the Sao Francisco River basin in Serra da Canastra, Brazil (Point 1: low vegetation and river showing calm and crystalline waters with small well formations; Point 2: current waters, and well-established areas of arboreal vegetation). Thus, the gonads of A. rivularis specimens were collected, fixed and processed with techniques for light microscopy. Five maturation phases of the females' reproductive cycle were established: immature, developing, spawning capable, regressing and regenerating. Three maturation phases of the males' reproductive cycle were observed: spawning capable, regressing, and regenerating. There are differences in the phases of gonadal development of A. rivularis between the two sampling points so that, possibly, animals upstream of the waterfall demonstrate a delay in the reproductive cycle in relation to animals downstream. (AU)

• FAPESP's process: 13/24218-5 - Comparative analysis of ovarian cycle Astyanax rivularis (Characidae) captured in different environments of Rio San Francisco, Serra da Canastra
• Grantee: Patrícia Postingel Quirino
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 14/23379-8 - Xenogenic transplantation of spermatogonial stem cells in Characidae (Teleostei, Characiformes)
• Grantee: Rosicleire Veríssimo Silveira
• Support Opportunities: Regular Research Grants