Micropogon furnieri: fecundidade e tipo de desova

Vazzoler, Anna Emilia Amato de Moraes

doi:10.1590/s0373-55241969000100003

Cited by 11 publications

(7 citation statements)

References 8 publications

(4 reference statements)

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“…The whitemouth croaker (M. furnieri) is the dominant species in terms of biomass, and it supports an important fishery in Uruguay and Argentina . This species is a multiple spawner (Vazzoler 1970(Vazzoler , 1971Macchi and Christiansen 1992) with small pelagic eggs (7301053 m, Weiss 1981) and a long life-span (39 years in Uruguayan and Argentine waters, Cotrina and Carozza 1997). Spawning takes place from November to April in the inner zone of the Río de la Plata estuary, in coincidence with the bottom salinity front (Macchi and Christiansen 1996).…”

Section: Introductionmentioning

confidence: 99%

Estuarine spawning of the whitemouth croaker Micropogonias furnieri (Pisces : Sciaenidae), in the Río de la Plata, Argentina

Eduardo¹,

Mianzán²,

Lasta³

et al. 1999

Mar. Freshwater Res.

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Most fishes that take advantage of the high productivity of estuaries exhibit offshore spawning, produce great numbers of small pelagic eggs and recruit to estuaries as larvae or juveniles. The reproductive pattern of Micropogonias furnieri (a planktonic egg spawner) in the Río de la Plata estuary (36°S,56°W) differs from this. Biological sampling and oceanographic data showed that the spawning area covers a narrow band across the river between Montevideo (34°50´8S,56°10´W) and Punta Piedras (35°25´S,57°10´W) at depths ranging from 6 to 8 m. This area is characterized by strong haloclines, reaching 21.5 units m-1. M. furnieri eggs were present only below the halocline, in salinities of 9.7–27.3, and at 18.5–20.2°C. Spawning occurred in the innermost part of the estuary, near the upstream edge of the salinity wedge and coinciding with the turbidity maximum (up to 150 mg L-1). The regular spawning of pelagic eggs has been reported in estuaries of southern Africa and Australia characterized by intermittent landlocking. The present results show that a large estuary may also provide the opportunity for successful spawning of pelagic eggs. Resumen. La mayoría de los peces que aprovechan la alta productividad de los estuarios efectúan sus desoves en el océano, producen gran cantidad de pequeños huevos pelágicos, y se reclutan a los estuarios como larvas o juveniles. El patrón reproductivo de Micropogonias furnieri (un desovante de huevos planctónicos) en el Río de la Plata (36°S,56°W), resulta diferente. Muestreos biológicos y datos oceanográficos demuestran que su área de desove cubre una estrecha franja a través del río, entre Montevideo (34°50´S,56°10´W) y Punta Piedras (35°25´S,57°10´W), en profundidades de 6 a 8 m. Esta área se caracteriza por fuertes haloclinas, de hasta 21.5 unidades m-1. Los huevos de M. furnieri se encuentran sólo debajo de la haloclina, en salinidades de 9.7 a 27.3, y temperaturas de 18.5° a 20.2°C. El desove tiene lugar en la parte más interna del estuario, cerca del límite río arriba de la cuña salina, y en coincidencia con el máximo de turbidez (hasta 150 mg L-1). En estuarios del sur de Africa y Australia, caracterizados por el cierre intermitente de su boca, ha sido reportado el desove regular de huevos planctónicos. Nuestros resultados demuestran que un gran estuario también puede proveer la oportunidad para el desove exitoso de huevos planctónicos.

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Section: Introductionmentioning

confidence: 99%

Estuarine spawning of the whitemouth croaker Micropogonias furnieri (Pisces : Sciaenidae), in the Río de la Plata, Argentina

Eduardo¹,

Mianzán²,

Lasta³

et al. 1999

Mar. Freshwater Res.

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“…In animals with partial spawn, vitellogenic, PV, Mtg, M, and/or ovulated oocytes may coexist in the ovary. The white croaker is a partial spawn fish (Vazzoler, 1970) and, for this reason, low proportions of PV oocytes mature at the same time, and several follicular stages, including Mtg, coexist. Steroid synthesis results from the overall enzymatic activity in each stage, and in vitro progesterone metabolism reflects this situation.…”

Section: Discussionmentioning

confidence: 99%

Steroid metabolism in vitro during final oocyte maturation in white croaker Micropogonias furnieri (Pisces: Scianidae)

et al. 2004

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Final oocyte maturation (FOM) is a process involving a complex set of genetical, biochemical, and morphological mechanisms. FOM involves the shift of a post-vitellogenic follicle to a pre-ovulated oocyte, which is necessary for fertilization by spermatozoan to occur. This process is regulated by a maturation-inducing steroid (MIS) at the follicular level. In other species of scienids fish the MIS, a hydroxilated derivatives of progestagen 17, 20beta, 21-trihydroxy-4-pregnen-3-one (20beta-S), was identified. Although Micropogonias furnieri is the second fishery resource of Uruguay, basic knowledge about its endocrine process is very scarce. The aim of this work was to investigate what steroids are synthesized in vitro by the oocyte follicle of M. furnieri during the maturation process. Fragments of ovary (1 g) in three stages: post-vitellogenic (PV), maturing (Mtg), and mature (M) were incubated with 1 microg x g(-1) of tritiated progesterone (P) at 30, 60, and 180 min. After extraction with ethanol and dichloromethane, steroid metabolites were purified by TLC and rpHPLC. Two progesterone derivatives with identical chromatographic properties of 20beta-S and 17,20beta-dihydroxy-4-pregnen-3-one (17,20beta-P) were purified. In other Teleost fish these steroids are biologically active as MIS. The 17,20beta-P was clearly detected in Mtg and M stages and confirmed by enzymatic oxidation with enzyme 20beta-HSD. The 20beta-S was strongly detected in all Mtg oocytes. The results do not corroborate 20beta-S as a major hormone synthesized in the ovary in FOM as occurs in other scienid fish. A differential steroid synthesis in the advanced oocyte stages suggests that the 20beta-S is acting as a MIS in M. furnieri.

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“…Na primavera, as isotermas são aproximadamente paralelas ã cost a; corno as aguas mais frias es t ão a s sociadas a salinidades mais baixas, e evidente a inf l uência da s aguas de or igem subantar tica, da Corrente das Mal-Vlna s. Neste período, v er i fi cou-se três núcleos de densidade elevada: um, diante de 8arit a (32°27 '8 ) ("adu ltos pequenos") a 26 m de profundidade, na fai xa de 14°C, 31 ,2 % 0 e 5,2 2 ml /l; outro, entre Chuí e Albardão ("adultos pequenos") a 3S m de profundidade , na isoterma de 11°C, com sali nidade de 32,2 % 0 e 5,S6 ml/l ; e um ter cei ro , a 22 m de profundidade entre Maldonado e Chuí ("adultos pe quenos "), na faixa costeira, a 13°C, 32,10/00 e 5,S6 ml/l. (Vazzoler, 1969;1971), MacrodonancyZodo n (Vazzoler, 1963a;Yamaguti, 1967), MerZuccius merZuccius hubbsi (Angelescu et aZ., 1958;Ciechomski, 1967), e sugerida para outros Sciaenidae (Vazzoler, Zaneti & Kawakami, 1973).…”

Section: Discussaounclassified

“…l ? Vazzoler (1971). A leitura dos anéis dos otólitos foi feita após os mesmos serem queimados em chama de bico de Bunsen ate adquirirem cor de caramelo (Christensen, 1964); após esfriarem , foram quebrados numa secção transversal mediana e colocados em recipiente de fundo preto, imersos em xilol, orientados sobre um suporte metalico com a face quebrada voltada para cima, e iluminados com luz direta sob estereomicroscópio Wild M-5.…”

unclassified

Bionomia e ciclo de vida de Umbrina canosai, Berg (1895)

Zaneti-Prado

1979

Bol. Inst. Oceanogr.

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Micropogon furnieri: fecundidade e tipo de desova

Cited by 11 publications

References 8 publications

Estuarine spawning of the whitemouth croaker Micropogonias furnieri (Pisces : Sciaenidae), in the Río de la Plata, Argentina

Estuarine spawning of the whitemouth croaker Micropogonias furnieri (Pisces : Sciaenidae), in the Río de la Plata, Argentina

Steroid metabolism in vitro during final oocyte maturation in white croaker Micropogonias furnieri (Pisces: Scianidae)

Bionomia e ciclo de vida de Umbrina canosai, Berg (1895)

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