Feeding ecology and morphometry of the digestive tract of &lt;i&gt;Astronotus ocellatus&lt;/i&gt; (Cichlidae) in várzea environments of the Middle Solimões Region, Central Amazon, Brazil.

Trindade, Márcia Emília de Jesus; Queiroz, Helder Lima de

doi:10.31420/uakari.v8i1.109

Cited by 5 publications

(8 citation statements)

References 6 publications

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“…ocellatus was introduced into the São Francisco River from the Amazon basin. It is characterized as carnivorous, with an insectivorous-piscivorous tendency (Trindade & Queiroz 2012). Trindade & Queiroz (2012) recently reported that the diet of A. ocellatus in the central Amazon was mainly composed of insects and fish, although the proportion of fish was small concerning the constant and high proportions of insects.…”

Section: Discussion δ 13 C Variability and Diet Preferencementioning

confidence: 99%

“…It is characterized as carnivorous, with an insectivorous-piscivorous tendency (Trindade & Queiroz 2012). Trindade & Queiroz (2012) recently reported that the diet of A. ocellatus in the central Amazon was mainly composed of insects and fish, although the proportion of fish was small concerning the constant and high proportions of insects. The stomach contents of A. ocellatus as analyzed here, however, showed that mollusks were its most important food source (IAi = 0.804), distinct from its diet in its native environment (reflecting the predominance of mollusks in the Moxotó Reservoir, in the São Francisco River).…”

Section: Discussion δ 13 C Variability and Diet Preferencementioning

confidence: 99%

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Carbon and oxygen stable isotopes of freshwater fish otoliths from the São Francisco River, northeastern Brazil

Pereira

Sial

Pinheiro

et al. 2021

An. Acad. Bras. Ciênc.

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Fish otoliths store geochemical and isotopic signatures that can be used as proxies for environmental conditions in ecological investigations. We investigated the δ 13 C and δ 18 O of otoliths of four freshwater fish species (Astronotus ocellatus, Serrasalmus brandtii, Plagioscion squamosissimus, and Cichla ocellaris) from the Moxotó Reservoir in the São Francisco River, Brazil. The enriched δ 13 C signatures that distinguish A. ocellatus from other species could be caused by dissolved inorganic carbon (δ 13 C DIC) in reservoir waters. Macrophytes growing along the reservoir margins would favor photosynthetic uptake of 12 C, leading to enriched δ 13 C DIC incorporated into the otoliths of those fish. Otolith δ 18 O signatures appear to reflect water column preferences, in which species preferentially inhabiting surface waters (such as S. Brandtii) show more enriched values (due to high surface evaporation ratios), while bottom water species show depleted δ 18 O values. Our results represent the first investigation of the isotopic compositions of fish otoliths in freshwater environments in the São Francisco River, and shed light on the interpretation of isotopic information stored in otoliths and how they can be used to infer the ecological strategies of freshwater fish.

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Section: Discussion δ 13 C Variability and Diet Preferencementioning

confidence: 99%

Section: Discussion δ 13 C Variability and Diet Preferencementioning

confidence: 99%

Carbon and oxygen stable isotopes of freshwater fish otoliths from the São Francisco River, northeastern Brazil

Pereira

Sial

Pinheiro

et al. 2021

An. Acad. Bras. Ciênc.

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show abstract

“…Changes in diet can alter the intestinal length and intestinal coefficient, even intraspecifically, because it is a variable that responds sensitively to shifts in feeding conditions (Winemiller 1989, Angelescu & Gneri 1949, Kapoor et al 1976, Dala-Corte et al 2016. Furthermore, other morphological traits such as size and weight can be altered depending on the variety and amount of food ingested by the fish, since fish body composition is influenced by food type and food intake (Abbas & Siddiqui 2009, Trindade & Queiroz 2012, Kokubun et al 2018. The relationship between individuals' length and weight in a fish population is a quantitative description used as a basic tool for assessing natural populations (Froese 2006, Labocha & Hayes 2012, Khristenko & Kotovska 2017.…”

Section: Introductionmentioning

confidence: 99%

DIET COMPOSITION, CONDITION FACTOR AND INTESTINAL COEFFICIENT OF THE FISH Astyanax lineatus REFLECT THE ANTHROPOGENIC EFFECTS ON STREAMS IN CENTRAL BRAZIL

2022

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Human activities, such as urbanization, can cause instability in the aquatic biota. This instability can modify aquatic food resource availability, consequently shifting the diet composition of fish. Because the diet consumed by fish closely affects the anatomy of their digestive tract, it can also alter their intestinal coefficient. In this study, we analyzed the diet composition, condition factor and intestinal coefficient of Astyanax lineatus (Perugia, 1891) from two distinct habitats: a "degraded habitat" (Cabaça stream) in a reserve inside the city perimeter and a "preserved habitat" (Salobra River) in Mato Grosso do Sul State, Central Brazil. We found a total of 15 food items, all of which were found in the urban stream, with a predominance of detritus and Chironomidae larvae, and six in the natural area, with a predominance of plant remains. There was a distinct difference in diet composition between fishes in the two areas (p < 0.05, PERMANOVA); however, there was no significant difference in inter-individual variability. The most frequent food items were detritus in the "degraded habitat", while in the "preserved habitat" plant and insect remains were most frequent. The relative condition factor measured by the fish's length-weight relationship was not significantly different between the two habitats. The intestinal coefficient was significantly different between the individuals from each habitat, and it was longer in fish from the natural habitat. Therefore, even though A. lineatus is known to be a generalist species, its feeding plasticity depends on the ecological integrity of the two types of habitats.

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“…Uma das grandes vantagens da piscicultura ornamental é o seu baixo custo de produção, o que permite a implantação em pequenas áreas e utilização de mãode-obra familiar (Cardoso et al, 2012). O oscar (Astronotus ocellatus), também conhecido como apaiari ou acará-açu, é um ciclídeo ornamental carnívoro, nativo da Bacia Amazônica (Trindade and Queiroz, 2012). Esta espécie é conhecida pela tolerância a baixas taxas de oxigênio (Wood et al, 2009), pelo temperamento calmo e comportamento territorialista, e possui importância econômica no Brasil e no mundo.…”

Section: Introductionunclassified

Eugenol como anestésico para oscar, Astronotus ocellatus

et al. 2015

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A utilização de anestésicos durante práticas de manejo na piscicultura é considerada uma medida mitigadora do estresse dos peixes. A espécie utilizada no experimento, o oscar, é um peixe nativo da Bacia Amazônica de grande importância para a piscicultura ornamental e amplamente difundida na aquariofilia mundial. O objetivo deste trabalho foi avaliar o efeito anestésico do eugenol sobre juvenis de oscar. Foram utilizados juvenis com peso de 4,61 ± 0,83 g e comprimento total de 6,36 ± 0,32 cm submetidos a diferentes concentrações de eugenol na água, em aquários distintos e posteriormente foi observada sua recuperação em aquários sem eugenol. Foram avaliadas quatro concentrações de eugenol: 40; 60; 80 e 100 mg/L. Os valores referentes ao tempo de permanência nos estágios de sedação e recuperação, bem como o tempo para completa sedação e retorno à natação normal foram avaliados e analisados via ANOVA (P

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Feeding ecology and morphometry of the digestive tract of <i>Astronotus ocellatus</i> (Cichlidae) in várzea environments of the Middle Solimões Region, Central Amazon, Brazil.

Cited by 5 publications

References 6 publications

Carbon and oxygen stable isotopes of freshwater fish otoliths from the São Francisco River, northeastern Brazil

Carbon and oxygen stable isotopes of freshwater fish otoliths from the São Francisco River, northeastern Brazil

DIET COMPOSITION, CONDITION FACTOR AND INTESTINAL COEFFICIENT OF THE FISH Astyanax lineatus REFLECT THE ANTHROPOGENIC EFFECTS ON STREAMS IN CENTRAL BRAZIL

Eugenol como anestésico para oscar, Astronotus ocellatus

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