Arginine-Vasotocin Neuronal System in Steindachneridion parahybae (Siluriformes: Pimelodidae) and Its Influence on Artificially Induced Spawning in Captivity

Author:

Honji Renato M.1ORCID,Araújo Bruno C.2ORCID,de Mello Paulo H.3,Ramallo Martín R.4,Morandini Leonel4,Caneppele Danilo5,Moreira Renata G.6

Affiliation:

1. Laboratório de Aquicultura e Ecofisiologia Marinha (LAQUEFIM), Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo (IB/USP), Rua do Matão, Travessa 14, nº 321, São Paulo 05508-090, SP, Brazil

2. Núcleo Integrado de Biotecnologia, Universidade de Mogi das Cruzes, Mogi das Cruzes 08701-970, SP, Brazil

3. Beacon Development, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia

4. Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires & IBBEA, CONICET/UBA, Ciudad Universitaria (C1428EHA), Buenos Aires 5000, Argentina

5. HMZ Aquicultura & Conservação. Rua Telmo Arnaut de Carvalho, 262, Paraibuna 12260-000, SP, Brazil

6. Laboratório de Metabolismo e Reprodução de Organismos Aquáticos (LAMEROA), Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo (IB/USP), Rua do Matão, Travessa 14, nº 321, São Paulo 05508-090, SP, Brazil

Abstract

This study summarizes new data on induced spawning of Steindachneridion parahybae, focusing on the aggressive behavior of females. This study characterizes the vasotocinergic system using immunohistochemistry, highlighting the potential influence of arginine-vasotocin (AVT) on reproductive physiology. Two experimental groups were proposed: (A) control, with one female in the aquarium, and (B) experimental, with two females in the same aquarium. Dominant (D) females presented a more aggressive behavior and did not show any injury. They apparently had a length and body mass higher than injured nondominant (ND) females. The analysis identified positive AVT immunoreactive (ir) neurons exclusively within the preoptic area, including parvocellular, magnocellular, and gigantocellular subpopulations, containing fibers-ir extending into the pituitary gland. Cellular and nuclear areas were greater in D compared to ND in the magnocellular subpopulation. There were no differences between parvocellular and gigantocellular subpopulations. There was a difference on the steroid plasma profile of cortisol (more in ND than in D) and 17α,20β-dihydroxy-4-pregnen-3-one (more in D than in ND). Furthermore, control and D females presented higher optical densities for AVT-ir, gonadotropin-releasing hormone-ir, and luteinizing hormone-ir than ND. In general, there were no differences in the results of female (control group) with D females. The AVT system is highly complex, possibly counting multiple sites of action during artificial reproduction and acting directly and/or indirectly associated with behavioral and physiological changes in S. parahybae females when induced to spawning.

Funder

FAPESP

Programa de Mobilidade Internacional de Alunos de Pós-Graduação—Santander/Banespa; and CAPES

CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) productivity scholarship

Publisher

MDPI AG

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