Ritmo de alimentação de juvenis de Loricariichthys anus (Siluriformes, Loricariidae) da Lagoa dos Quadros, RS, Brasil

Petry, Ana Cristina; Schulz, Uwe Horst

doi:10.1590/s0073-47212000000200006

Cited by 8 publications

(10 citation statements)

References 4 publications

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“…The process begins with light perception by the retina, which activates melatonin production in periods of darkness (mainly by the pineal gland) and inhibits it in the presence of light (Bayarri et al, 2004;Veras et al, 2013). As result of physiological intrinsic mechanism of light perception, the fish movement behaviors are related to several ecological requirements, such as feeding, seeking shelter, and reproduction (Buck & Sazima, 1995;Petry & Schulz, 2000;Ramallo et al, 2015), and there are summarized as specific trade-offs between safety, foraging (Rickel & Genin, 2005), and reproduction (Lamba, Goswami, & Sundararaj, 1983).…”

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confidence: 99%

Daily movement behavior of two Neotropical armored catfish species (Ancistrusaff. cirrhosusValenciennes, 1836 andHypostomus ancistroidesIhering, 1911) at a road-stream crossing culvert

et al. 2017

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Summary We hypothesized that the use of habitat by two armored catfish species, Ancistrus aff. cirrhosus and Hypostomus ancistroides, which share the same stream reach, is temporally segregated. To test this, fish residence time within a culvert and fish movements through the culvert were analyzed in relation to the daily hours, lunar cycle and discharge using Passive Integrated Transponder telemetry. The residence time for A. aff. cirrhosus conducting upstream movements was longer than H. ancistroides. Both species exhibited high nocturnal activity, although at different periods: A. aff. cirrhosus was most active at dawn (00:00–05:59 hr), while H. ancistroides exhibited intense activity at night (18:00–23:59 hr), indicating temporal segregation of movement behavior between species. In addition, A. aff. cirrhosus was most active in the new moon phase and when there was high water discharge, while H. ancistroides was most active only when there was high water discharge. This study elucidates the patterns of daily movement behavior and temporal habitat use of these fish species.

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confidence: 99%

Daily movement behavior of two Neotropical armored catfish species (Ancistrusaff. cirrhosusValenciennes, 1836 andHypostomus ancistroidesIhering, 1911) at a road-stream crossing culvert

et al. 2017

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“…The IQ observed for L. melanocheilus is below that registered for L. anus (Petry & Schulz, 2000;Albrecht & Silveira, 2001), for other species of the family Loricariidae (Delariva & Agostinho, 2001) and other species considered detritivorous, such as P. lineatus and S. brevipinna (Moraes et al, 1997;Giora & Fialho, 2003). Although L. melanocheilus is classified as detritivorous, the IQ found is similar to the omnivorous (Ward-Campbell, Beamish & Kongchaiya, 2005).…”

Section: Resultsmentioning

confidence: 87%

“…Regarding the genus Loricariichthys, studies are primarily concentrated on L. anus (Albrecht & Silveira, 2001;Petry & Schulz, 2000) and L. platymetopon (Agostinho, Hahn, Gomes & Bini, 1997), but research on L. melanocheilus is lacking. In general, these studies show a variety of foods consumed by the species, such as algae, microcrustaceans, fungi, plant remains, larval insects, besides a great amount of detritus and sediments, these items being considered by some authors as the most important for the diet of Loricariidae (Almeida & Resende, 2012;Agostinho et al, 1997;Fugi, Agostinho, & Hahn, 2001).…”

Section: Introductionmentioning

confidence: 99%

<b>Trophic ecology of <i>Loricariichthys melanocheilus</i> Reis & Pereira, 2000 (Siluriformes: Loricariidae) in Ibicuí river, southern Brazil

Zardo

Behr

2016

Acta Sci. Biol. Sci.

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ABSTRACT. Aiming to characterize aspects of the trophic ecology of Loricariichthys melanocheilus in the Ibicuí river, bimonthly samples were taken in lotic and lentic ecosystems. Fish were caught and fixed in 10% formalin and dissected for stomach content analysis. Items were identified to the lowest taxonomic level possible. Stomach fullness (SF), repletion index (RI) and intestinal quotient (IQ) were estimated. Diet was assessed by the frequency of occurrence and the volumetric method, combined to obtain a Alimentary index. Feeding activity was analyzed with mean values of SF, RI and vacuity index (VI), which represents the percentage of empty stomachs. These parameters were compared seasonally, spatially, and according to the circadian rhythm. The main items in the trophic spectrum of L. melanocheilus were detritus, sediment, plant organic matter, nematodes, micro crustaceans (Copepoda, Cladocera) and insects (Diptera, Trichoptera, Ephemeroptera and Odonata). No environmental or seasonal variations were found for the consumed items. Feeding activity showed seasonal and environmental variations according to RI but did not significantly change according to SF. The IQ was 1.51, and showed seasonal variations, indicating changes in the diet. Keywords: feeding activity, feeding habits, intestinal quotient, stomach fullness, trophic spectrum. Ecologia trófica de Loricariichthys melanocheilusReis & Pereira, 2000 (Siluriformes: Loricariidae) no rio Ibicuí, sul do Brasil RESUMO. Com o objetivo de caracterizar aspectos da ecologia trófica de Loricariichthys melanocheilus no rio Ibicuí, amostras bimestrais foram realizadas em ecossistemas lóticos e lênticos. Os peixes foram capturados, fixados em solução formalina 10% e dissecados para a avaliação do conteúdo estomacal, sendo os itens identificados até a menor categoria taxonômica possível. Foram obtidos o grau de repleção (GR), índice de repleção (IR) e quociente intestinal (QI). A dieta foi avaliada por meio da frequência de ocorrência e pelo método volumétrico, sendo ambos combinados para se obter o índice alimentar (IAi). A atividade alimentar foi analisada a partir das médias de GR, IR e índice de vacuidade, representado pela porcentagem de estômagos vazios. Estes parâmetros foram comparados sazonalmente, ambientalmente e de acordo com o ritmo circadiano. Os principais itens presentes no espectro trófico de L. melanocheilus foram: detritos, sedimento, matéria orgânica vegetal, nematoides, microcrustáceos (Copepoda, Cladocera) e insetos (Diptera, Trichoptera, Ephemeroptera e Odonata). Não foram observadas variações ambientais ou sazonais nos itens consumidos. A atividade alimentar mostrou variações sazonais e ambientais de acordo com o IR e não variou significativamente conforme o GR. O QI obtido foi de 1,51, e mostrou variações sazonais, refletindo mudanças na dieta.Palavras-chave: atividade alimentar, habito alimentar, quociente intestinal, grau de repleção, espectro trófico.

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“…in lagoa dos Quadros, a highly turbid coastal lagoon in south brazil, juveniles of Loricariichthys anus, a bottom orientated armored catfish species, were more active during the day than at night. high swimming activity levels coincided with high feeding activity (Petry & schulz, 2000). however, most references cite catfish as predominantly nocturnal (hahn et al, 1997(hahn et al, , casatti & castro, 1998(hahn et al, , lu & Peters, 2003.…”

Section: Discussionmentioning

confidence: 99%

Activity patterns of South American silver catfish (Rhamdia quelen)

Schulz

Leuchtenberger

2006

Braz. J. Biol.

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The South American silver catfish (Rhamdia quelen) is a widely distributed species in Central and South America in areas east of the Andes between Venezuela and the northern parts of Argentina. The bottom dwelling species occurs in lakes and reservoirs as well as in rivers. Between June 2000 and December 2001, sixteen silver catfish were tracked during fourteen 24-h cycles in two-hour-intervals, with the aim of investigating daily movements and habitat use. Covered distances varied between 0 m/2 h and 326 m/2 h and the mean distance covered in 2 h was 25.6 m. The mean activity of individual silver catfish varied between 5.6 m/2 h and 81.4 m/2 h. The swimming activity was linearly related to the total fish length. The highest mean swimming activity occurred in the morning and at nightfall. Silver catfish concentrated in three areas of frequent use. All of them were characterized by steep banks providing shelter in the form of rip-rap or large woody debris. Vertically, silver catfish preferred the upper 2 m layer where tracked fish encountered higher temperatures and higher dissolved oxygen concentrations.

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Ritmo de alimentação de juvenis de Loricariichthys anus (Siluriformes, Loricariidae) da Lagoa dos Quadros, RS, Brasil

Cited by 8 publications

References 4 publications

Daily movement behavior of two Neotropical armored catfish species (Ancistrusaff. cirrhosusValenciennes, 1836 andHypostomus ancistroidesIhering, 1911) at a road-stream crossing culvert

Daily movement behavior of two Neotropical armored catfish species (Ancistrusaff. cirrhosusValenciennes, 1836 andHypostomus ancistroidesIhering, 1911) at a road-stream crossing culvert

<b>Trophic ecology of <i>Loricariichthys melanocheilus</i> Reis & Pereira, 2000 (Siluriformes: Loricariidae) in Ibicuí river, southern Brazil

Activity patterns of South American silver catfish (Rhamdia quelen)

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