Biologia reprodutiva da tabarana Salminus hilarii (osteichthyes, characidae) na represa de Três Marias

Abstract

ResumoEste trabalho teve como objetivo estudar a biologia reprodutiva da tabarana Salminus hilarii, na represa de Três Marias (MG). Foram determinados, a partir de exemplares capturados durante 20 meses, os seguintes parâmetros: comprimento padrão (CP), peso corporal (PC), índices gonadossomático (IGS), hepatossomático (IHS), de gordura abdominal (IGA) e estágio de maturação (em repouso, em maturação, maduro ou esgotado). Verificou-se que o período de reprodução da tabarana se concentra nos meses finais e iniciais do ano, podendo ser classificada como de desova total. Foi avaliado, ainda, o grau de aspereza ao tato das espículas na nadadeira anal dos machos, sendo observados incrementos crescentes conforme avançava o grau de maturação dos exemplares.Palavras-chave: reprodução, Salminus, reservatórios, característica sexual secundária, tabarana. AbstractReproductive biology of Salminus hilarii (osteichthyes, characidae) from a brazilian man-made lake This work was carried out at Três Marias dam, Minas Gerais State, Brazil, with the aim of studying the male and female reproductive biology of the fish Salminus hilarii in a man-made lake. From fishes captured during the period April/1982 to november/1984 the following results were obtained: the body length, body weight and the indices: gonadossomatic, hepatossomatic and abdominal fat; stages of ovarian development (dormant, in maturation, ripe and spawned or exhausted). It was verified that the spawning period S. hilarii occurred at the end and at the beginning of each year of this study and this fish species could be classified as a total spawner. From the observations of the level of the toughness of the anal fin of male fish (sexual secondary characteristic) it was verified that roughness was more evident in fish with ovaries in advanced maturation stage.

Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae): Implications for the conservation of this species

“…Slightly different intervals were observed in the Sorocaba River (Takahashi, 2006), in the Mogi Guaçu River (Godoy, 1975) and in the Três Marias reservoir, in Minas Gerais (Andrade et al, 2006), but these were included in the period observed in the present study.…”

“…Subsequent monitoring of the juveniles until maturation showed, for the first time, that S. hilarii males and females become mature at one year and two years old, respectively. Previous studies had only been able to base maturity (not first maturation) on total length (Nakatani et al, 2001;Andrade et al, 2006) due to the wild origin of the animals.…”

Descrição morfológica dos ovários do peixe Melanotaenia boesemani em atividade reprodutiva

“…Zaiden (2000), para Brycon hilarii, considerou repouso, maturação I, maturação II, maduro e regressão. Em Piracanjuba, observaram-se 4 está-dios de maturação: Repouso, Maturação Inicial, Maturação Avançada e Regressão (Ganeco et al 2001) e Andrade et al (2004) classificaram quatro estádios de maturação para a tabarana na represa de Três Marias: recuperação-repouso, em maturação, maduro e esgotado.…”

Evidence of incipient speciation in Astyanax scabripinnis species complex (Teleostei: Characidae)

“…The presence of hooks on fins has been reported in various species of characins, including other Astyanax species (Andrade et al, 1984;Andrade et al, 2004;Porto-Foresti et al, 2005), and is considered a temporary secondary sexual characteristic which appears only in males, generally, during the reproductive period (Ihering & Azevedo, 1936). According to Malabarba & Weitzman (2003), the presence of hooks on fins in adult males is a synapomorphy of the clade that includes the Gasteropelecidae, Serrasalmidae, and Characidae, and Mirande (2010) considers the absence of hooks as being a plesiomorphic character.…”