Aspectos reprodutivos de Sphoeroides greeleyi (Gilbert), Pisces, Osteichthyes, Tetraodontidae, da gamboa do Baguaçu, Baia De Paranaguá, Paraná, Brasil

Abstract

Reproductive aspects of Sphoeroides greeleyi (Gilbert), Tetraodontidae, from gam boa do Bagua~u, Paranagua, State of Parana, Brazil. The present study analyses the reproductive aspects of Sphoeroides greeleyi (Gilbert, 1900), such as morphology and hi stochemistry of carbohydrates in the oogenesis phases, maturity scale, time and type of spawn, sex ual rate and first ripened mature size for females. From the monthly captured animals (Nov 1998 to Nov 1999) the morphometric data (entire length and total weight) were extracted and the sex and the gonadal maturity were determined. Some ovaries were prepared for microscopic analysis that characterized six phases for the development of the ovarian follicles. Through the carbohydrates analysis the ac id carbohydrates could be related to the oogenesis maintenance and the neutral carbohydrates to the beginning of embryonic development. A maturity scale containing six stages of gonadal development was determined. The reproductive peri od is between August and January and the spawn time is from October to January. The first ripened mature size for females occurs between 6,Scm and 7.S cm of total length. The sex ual rate shows that there are more females than males during the reproductive period. KEY WORDS. Fish, reproduction, histology, histochemi stry Estwlrios sao areas de extrema importancia no cresc imento e a lime ntac;:ao para juvenis e larvas de inumeras especies de peixes e invertebrados (BARB IER1 et al. 1991).Canais no manguezal , chamados gam boas, sao caracteristicos de planicies litoraneas dos complexos estu arinos da regiao s udeste-s ul do Brasil. Sao vias importantes para fluxo de materia organ ica e ntre con ti n ente e estu ari o, sao tam bern importantes para 0 desenvolvimento de exemplares jovens de peixes e crustaceos , visto tratarem-se de areas usadas para alimentac;:ao e refugio (LANA et al. 1989). o processo reprod uti vo e de f undamenta l importancia para se co nh ecer a biologia das especies icticas e visa urn acrescimo de novos individuos as populac;:6es,

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.…”

“…They are representative of the Tetraodontidae family, characterized by two dentigerous plates in the upper jaw and two in the lower jaw. They feed mostly on gastropods, bivalves and crustaceans (Targett, 1978) and preferably dwell in bays and estuaries, where they are considered to be important in the trophic equilibrium (Duncan & Szelistowski, 1998;Schultz et al, 2002).…”