Ictioplancton del estuario de Lagoa dos Patos, Brasil

Weiss, Graciela

doi:10.35537/10915/5041

Cited by 8 publications

(18 citation statements)

References 2 publications

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“…Moreover, M. furnieri has never been reported as an estuarine spawner in other estuaries, e.g. Patos Lagoon (Weiss 1981;Vieira and Castello 1997) or Cananéia Lagoon (Sinque 1980). The reasons for this reproductive pattern may be addressed only in general terms from our data.…”

Section: Discussionmentioning

confidence: 51%

“…Along the wide latitudinal distribution of this species (20°N to 41°S, Isaac 1988), its larvae and juveniles have been reported in estuarine waters of several regions (Lowe-McConnell 1966;Sinque 1980;Weiss 1981;Lasta and Ciechomski 1988;Lasta 1995), but information on its spawning habitat is scarce. In the Patos Lagoon (32°S, Brazil), the eggs and larvae enter the estuary with salt water intrusions (Weiss 1981;Sinque and Muelbert 1997), and it is believed that adults spawn in adjacent waters, or in the mouth of the lagoon when salinity is high (Weiss 1981;Castello 1986;Vieira and Castello 1997).…”

Section: Discussionmentioning

confidence: 99%

“…In the Patos Lagoon (32°S, Brazil), the eggs and larvae enter the estuary with salt water intrusions (Weiss 1981;Sinque and Muelbert 1997), and it is believed that adults spawn in adjacent waters, or in the mouth of the lagoon when salinity is high (Weiss 1981;Castello 1986;Vieira and Castello 1997). Direct evidence of spawning in estuarine waters has never been reported for the whitemouth croaker except in the Río de la Plata estuary.…”

Section: Discussionmentioning

confidence: 99%

“…Volumes filtered during a tow varied from 7.0 to 35.8 m 3 . The plankton samples were sorted and analysed immediately on board, in a search for whitemouth croaker eggs; these were identified on the basis of the descriptions by Weiss (1981). Collected materials were then preserved in 2% buffered formaldehyde.…”

Section: Methodsmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…A variety of habitats, which provide an abundant food supply and protection against predators, make this estuary a suitable environment for the development of eggs and larvae (Weiss and Krug 1977;Weiss and Souza 1977a,b;Castello and Krug 1978;Weiss 1981;Muelbert 1986;Pereira 1986;Muelbert and Weiss 1991). The estuary serves as a nursery ground for coastal and estuarine species.…”

mentioning

confidence: 99%