Abundância e distribuição temporal de larvas de &lt;em&gt;Pachyurus bonariensis&lt;/em&gt; Steindachner, 1879 (Perciformes, Sciaenidae), em uma baía do pantanal matogrossense

Santin, Miriam; Bialetzki, Andréa; Assakawa, Luciana Fugimoto; Taguti, Tátia Leika

doi:10.4025/actascibiolsci.v31i1.306

Cited by 4 publications

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“…Several studies have demonstrated that the floodplain of the Cuiabá River is one of the main breeding sites of fishes in Pantanal (Lourenço et al, 2008), but there is a scarcity of studies that confirm the reproductive activity to help shed light about the influence of environmental factors on the distribution of the ichthyoplankton community of this region (Severi, 1997;Santin, 2007). Such studies are fundamental, since variations in larval distribution patterns reflect changes that affect the distribution of adult fish and traits of reproductive strategies, such as spawning time, duration and sites (Doyle et al, 1993;Nonaka et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal distribution of fish larvae in marginal lagoons of Pantanal, Mato Grosso State, Brazil

2010

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An analysis was made of the spatial and temporal distribution of the abundance and composition of fish larvae assemblies, aiming to ascertain correlations with biotic and abiotic factors in marginal lagoons of the Cuiabá River floodplain in Brazil's Pantanal wetlands. Samples were collected bimonthly in the pelagic region of the marginal lagoons (fourteen lagoons) close to the littoral zone covered by aquatic macrophytes from December 2006 to April 2007. The captured individuals consisted of 2,739 larvae, represented predominantly by Triportheus spp. (Characidae), Parodontidae, Anostomidae, Characidae and Serrasalmidae. Larval density varied among the sample lagoons in December, but the biotic (zooplankton density) and abiotic (water temperature, electrical conductivity, dissolved oxygen, pH, water transparency and lagoon depth) factors did not significantly affect larval composition and abundance. Larvae were captured throughout the sample period, with the highest densities occurring in December and early January. Temporally, lagoon depth, water transparency and fluviometric level showed a negative correlation with larval density. Both the zooplankton and the larval density vary positively, responding likewise to the environmental conditions imposed by flooding. The highest larval density was also found to coincide with the first rains (early December), when the rainfall has not yet reached its peak.Foi realizada uma análise da distribuição espaço-temporal da abundância e composição da assembleia de larvas de peixes, com o objetivo de verificar as correlações com os fatores bióticos e abióticos em lagoas marginais da planície de inundação do rio Cuiabá, Pantanal, Brasil. As amostras foram coletadas quinzenalmente na região pelágica das lagoas, perto da zona litorânea coberta por macrófitas aquáticas, de dezembro de 2006 à março de 2007, na planície de inundação. Foram capturadas 2.739 larvas, representadas predominantemente por Triportheus spp. (Characidae), Parodontidae, Anostomidae, Characidae e Serrasalmidae. A densidade de larvas variou entre as lagoas amostradas em dezembro, mas as variáveis bióticas (densidade de zooplâncton) e abióticas (temperatura da água, condutividade elétrica, oxigênio dissolvido, pH, transparência e profundidade da lagoa) não afetaram significativamente a composição e a abundância das larvas. As larvas foram capturadas ao longo de todo o período de amostragem, com maiores densidades no mês de dezembro e início de janeiro. Temporalmente, a profundidade da lagoa, a transparência e o nível fluviométrico mostraram uma correlação negativa com a densidade de larvas. Tanto a abundância de zooplâncton, quanto à abundância de larvas variaram positivamente, respondendo da mesma forma às condições ambientais impostas pela cheia. A maior densidade de larvas coincidiu com as primeiras chuvas (início de dezembro), quando a pluviosidade ainda não tinha atingido seu pico.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal distribution of fish larvae in marginal lagoons of Pantanal, Mato Grosso State, Brazil

2010

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“…Type 2 (larva), which indicates that the number of infected fish is higher as the standard length increases. Larvae from both species are zooplanktivorous (Santin, 2007). As these parasites are transmitted through the feeding of larvae, these results can be explained by a cumulative process where larger larvae fed on a greater range of potential intermediary hosts (zooplanktonic microcrustaceans), and thus are more liable to infection (Luque et al , 1996).…”

Section: Discussionmentioning

confidence: 99%

“…Pachyurus bonariensis are relatively small, but with some commercial value (Casatti, 2003) in the basins of the Paraná (Agostinho et al , 1993), Paraguay and Uruguay rivers (Montero & Fuentes, 1997). Their larvae can be categorized as zooplanktivorous (Santin, 2007), while juveniles and adults are benthivorous (Fugi et al , 2007).…”

Section: Introductionmentioning

confidence: 99%

“…According to Ahlstrom & Ball (1954), modified by Nakatani et al (2001), what separates a fish larva from a juvenile fish is that the former does not present morphological differentiation regarding the formation of the fins, while juveniles present all fins fully formed, including the segmentation of the rays. When larvae become juveniles, the recruitment length is about 10.01 mm for P. ternetzi (Nakatani et al , 2001) and 26.5 mm for P. bonariensis (Santin, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Helminths parasitizing larval fish from Pantanal, Brazil

et al. 2009

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Fish larvae of 'corvinas' (Pachyurus bonariensis and Plagioscion ternetzi) from Sinhá Mariana Lagoon, Mato Grosso State, were collected from March 2000 to March 2004, in order to determine the parasitic fauna of fishes. Larvae from the two species were parasitized by the same endoparasites: Contracaecum sp. Type 2 (larvae) (Nematoda: Anisakidae) in the mesentery and Neoechinorhynchus (Neoechinorhynchus) paraguayensis (Acanthocephala: Neoechinorhynchidae) in the stomach and the terminal portion of the intestine. Statistical analysis showed that there was a significant positive correlation between the standard length of hosts and the abundance of acanthocephalans and nematodes, and that the prevalence of nematodes presented a significant positive correlation with the standard length of the two species of hosts, indicating the presence of a cumulative process of infection. The present study constitutes the first record of nematodes and acanthocephalans parasitizing larval fish, as well as the first record of endoparasites in fish larvae in Brazil. In addition, it lists a new locality and two species of hosts for Contracaecum sp. Type 2 (larva) and N. (N.) paraguayensis.

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Biologia reprodutiva de Pachyurus bonariensis (Perciformes, Sciaenidae) na fase pré-represamento do arroio Taquarembó, Sul do Brasil

Lagemann

Fialho

2014

Iheringia, Sér. Zool.

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Abundância e distribuição temporal de larvas de <em>Pachyurus bonariensis</em> Steindachner, 1879 (Perciformes, Sciaenidae), em uma baía do pantanal matogrossense

Cited by 4 publications

References 4 publications

Spatial and temporal distribution of fish larvae in marginal lagoons of Pantanal, Mato Grosso State, Brazil

Spatial and temporal distribution of fish larvae in marginal lagoons of Pantanal, Mato Grosso State, Brazil

Helminths parasitizing larval fish from Pantanal, Brazil

Biologia reprodutiva de Pachyurus bonariensis (Perciformes, Sciaenidae) na fase pré-represamento do arroio Taquarembó, Sul do Brasil

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