Biologia reprodutiva de Sphoeroides testudineus (Linnaeus) (Pisces, Osteichthyes, Tetraodontidae) da gamboa do Baguaçu, Baía de Paranaguá, Paraná, Brasil

Abstract

ABSTRACT. Reproductive biology of Sphoeroides testudilleus (Linneus) (Pisces, Osteichthyes, Tetraodontidae) of the gam boa do Bagua~u, Bay of Paranagua, State of Parana, Brazil. The present study seeks to elucidate reprod uctive as pects of Sph.oeroides lesludilleus (Linnae us, 1758), Tetraodontidae. Monthl y collections were acco mpli shed for one year (November/98-0ctober/99), in the gamboa do Bagua~lI, Bay of Paranagua with a Fyke net. The macroscopic analysis of the gonad stages allowed us to estimate the sex ual proportion as I: I during the whole period, except in the months of May and October, when the proportions of two females for one male and two males for one female were observed respectively. The analysis of the relative frequency of the monthly gonad stages and the Curve of Maturation aided in the determination of the reproductive period, that occurred from September to January. Microscopi c analyses of the female gonads allowed us to characterize four deve lopment phases of the ovari an follicle , six stages of ovari an development and the type of spawn, which was parceled. The first maturation for females was estimated to be between 10-11 cm of length . KEY WORDS. Tetraodontidae, puffer fishes, reproduction Os ecossistemas estuarinos sao importantes para reproduc;:ao e desenvolvimento de varias especies de peixes, os quais geralmente possuem alta capacidade de adaptac;:ao as variac;:6es abi6ticas caracterfsticas des tes ambientes. Os complexos estuarinos da regiao su l-sudeste do Brasil sao caracterizados por apresentarem canais no manguezal, chamados gam boas, responsaveis pelo grande fluxo de materia organica entre continente e estuario , alem de abrigarem ad ultos e formas juvenis de peixes e crustaceos durante seu desenvolvimento.Segundo DIAS et al. (1998), estudos reprodutivos permitem nao s6 com preender os mecanismos envolvidos na perpetuac;:ao das especies, mas tam bern uma melhor administrac;:ao pesqueira baseada no uso que os indivfduos de uma especie faze m de urn sistema ou area.Dentre as diversas especies estuarinas, Sphoeroides testudineus (Linnaeus, 1758) (baiacu pintado) despertou urn grande interesse pela sua abundancia em

A study of the fish community structure in a tidal creek

“…An explanation for this pattern is that the tide channel was dominated by the resident estuarine species A. parva, B. ronchus, G. genidens, S. greeleyi, and S. testudineus and the marine species H. clupeola, with similar life histories. The resident ones spawned at the site or close to the area in the spring and summer, and the marine species in the adjacent coastal zone (Chaves, 1989(Chaves, , 1995Rocha et al, 2002;Schultz et al, 2002), with the recruitment occurring mainly between the summer and beginning of winter. Reproduction in the spring and summer, with subsequent recruitment in the summer and autumn has been observed in most of the local species (Pinheiro, 1999;Chaves & Otto, 1999;.…”

Reprodução do bagre amarelo, Cathorops spixii (Agassiz) (Siluriformes, Ariidae), da Baía de Pinheiros, região estuarina do litoral do Paraná, Brasil

“…Algumas espécies estuarinas do referido local, tais como Sphoeroides greeleyi (Gilbert, 1900) (SCHULTZ et al 2002), Sphoeroides testudineus (Linnaeus, 1758) (ROCHA et al 2002) e Atherinella brasiliensis (Quoy & Gaimard, 1825) (FÁVARO et al 2003), já tiveram a sua reprodução analisada e assim, este trabalho fornece dados biológicos de mais uma espécie ecologicamente importante neste sistema.…”

Environmental influences on the spatial and temporal distribution of the puffer fish Sphoeroides greeleyi and Sphoeroides testudineus in a Brazilian subtropical estuary

“…Juveniles were defined as those specimens presenting gonads at the immature stage (A), and adults, the specimens whose gonads were at the stages: maturation (B), mature (C), partially spawned (SD) or spawned/ spent (D). Histological characterization was based on the works of Schultz et al, 2002 andRocha et al, 2002, who studied the reproduction of these species in the same estuarine system.…”

“…Spach et al (2003) and Felix et al (2006) reported an increase in the catch rate of puffer fish during the period when temperatures are higher and, according to the community studies conducted by Godefroid et al (1997) and Santos et al (2002), there is an upward tendency in the abundance of fishes in the warmest periods of the year. Rocha et al (2002) and Schultz et al (2002), who studied the reproductive biology of S. greeleyi and S. testudineus in the estuarine complex of Paranaguá, established that the peak of reproductive activity for both species is in October (spring). The spawning season extends from October to February, while recruitment occurs over the subsequent months, corresponding to the summer and autumn.…”