Análise qualitativa da alimentação e o coeficiente intestinal de Metynnis cf. roosevelti Eigenmann (Characidae, Myleinae), da Lagoa Redonda, Nízia Floresta, Rio Grande do Norte, Brasil

Gurgel, Hélio de Castro Bezerra; Almeida, Raimunda Gonçalves de; Barbieri, Geraldo

doi:10.1590/s0101-81751994000200018

Cited by 5 publications

(2 citation statements)

References 5 publications

(1 reference statement)

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“…In January, during the breeding season of the fish, that goes from November to February (Vazzoler, 1996), the greatest proportion of empty stomachs was observed, corroborating the findings of Gurgel et al (1994), where minimum values of stomach fullness were recorded in the period after spawning for both sexes of the fish species studied.…”

Section: Methodssupporting

confidence: 78%

Cladocerans from gut contents of fishes associated to macrophytes from Taquari River Basin, MS, Brazil

et al. 2012

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Aim:The aim of this study was to identify the cladocerans species from the gut contents of fishes sampled in an oxbow lake from Taquari River Basin, MS, with the specific view of investigating the importance of these crustaceans in the fishes diets; Methods: Sampling was carried out in April and August of 2005 (dry season) and January of 2006 (wet season). The fish were captured with a sieve. In the laboratory, individuals were identified and stomachs were removed and weighed. The stomach contents were identified, and a Feeding Index calculated; Results: The items most consumed by fishes were filamentous algae, Cladocera and detritus. The Cladocera were especially important in the August and January samples, and consisted primarily of Chydoridae; cladocerans were most consumed by species of Serrapinnus and by Mesonauta festivus. Fish fed more in April, with decreases occurring in stomach fullness on the other two sampling dates. Conclusions: Cladocerans associated with macrophytes may be an important food source for small fish individuals in marginal lakes from Taquari River Basin. The relative importance of the Chydoridae in the guts may have been due to the high relative abundance and species richness of this group in the environment. A short discussion on fish feeding habits was included in the text.Keywords: microcrustaceans, Chydoridae, ichthyofauna, floodplain, fish feeding.Resumo: Objetivo: Este estudo teve por objetivo identificar as espécies de cladóceros presentes no conteúdo estomacal de peixes amostrados em uma lagoa marginal da Bacia do Rio Taquari, MS, visando avaliar a importância destes crustáceos na dieta dos peixes; Métodos: A amostragem foi realizada em abril e agosto de 2005 (estação seca) e janeiro de 2006 (estação chuvosa). Os peixes foram capturados com um peneirão. Em laboratório, os indivíduos foram identificados até o nível de espécie e os estômagos removidos e pesados. O conteúdo estomacal foi identificado e um Índice Alimentar calculado. Resultados: Os itens mais consumidos pelos peixes foram algas filamentosas, Cladocera e detritos. Os Cladocera foram especialmente importantes em agosto e janeiro e consistiram principalmente de espécies de Chydoridae; os cladóceros foram mais consumidos por espécies de peixes do gênero Serrapinnus e por Mesonauta festivus. Conclusões: Cladóceros associados a macrófitas podem ser uma importante fonte de alimento para peixes de pequeno porte em lagoas marginais da Bacia do Rio Taquari. A importância relativa de Chydoridae nos estômagos deve ter sido devida à elevada abundância relativa e riqueza de espécies deste grupo de cladóceros no ambiente. Uma pequena discussão sobre os hábitos alimentares das espécies de peixes encontradas na lagoa foi incluída no texto.Palavras-chave: microcrustáceos, Chydoridae, ictiofauna, planície de inundação, alimentação de peixes.

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Section: Methodssupporting

confidence: 78%

Cladocerans from gut contents of fishes associated to macrophytes from Taquari River Basin, MS, Brazil

et al. 2012

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“…The average intestinal quotient of M. lippincottianus was high, reaching about five times the standard length of the individual. This reinforces the herbivorous diet since other herbivorous fishes display similar intestinal lengths (Gurgel et al 1994, Cañan et al 1997, Smith et al 2003 and, in general, the lowest the trophic level of fishes, the longer their intestinal lengths (Karachle & Stergiou 2010).…”

mentioning

confidence: 57%

Grazing Unworried: Environmental Changes in a Dammed River Favor the Diet of the Invasive Metynnis Lippincottianus (Characiformes, Serrasalmidae)

Luduvice,

Soares,

Rosa

et al. 2024

Oecol. Aust.

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We evaluate the natural diet of the invasive silver dollar Metynnis lippincottianus in the Lower São Francisco River, Brazil. The species' diet was composed almost exclusively of Zygnemataceae algae, a food item consumed by almost all individuals (Frequency of Occurrence (FO) = 99.80%). The remaining consumed items were plant fragments (FO = 3.57%), mites (FO = 2.38%), gastropods (FO = 1.19%), thalloid algae (FO = 1.19%), ants (FO = 1.09%), and invertebrate eggs (FO = 1.09%). The high alimentary importance of Zygnemataceae algae (Alimentary Index = 99.992%) highlights the lack of a great intraspecific variation in the diet of M. lippincottianus and a high trophic specialization. The herbivorous diet, with a tendency to consume algae, is supported by high values of intestinal coefficient (4.71 ± 1.45) that favor the digestion of these items and are commonly related to low trophic levels. The specialized diet of M. lippincottianus is supported by the proliferation of algae following the damming of the river. In addition, the diet composition of the species changed between the rainy and the dry season (PERMANOVA, p < 0.001), displaying a broader niche by the consumption of alternative items (e.g., thalloid algae, gastropods) in the rainy season. The species had an herbivorous diet, with a predominance of filamentous algae, throughout the study, with small variations between seasons.

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Microbiological analysis of water and fish of fish farms in the protection area of the western lowlands of Maranhão, Brazil

Silva

Nascimento

Gomes

et al. 2021

Aquaculture Research

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This work aimed to analyse the water quality and identify the fungal diversity present in the skin and gills of tambatinga fish from the environmental protection area of the western lowlands of Maranhão, Brazil. The physicochemical parameters of water were analysed and microbiological tests were carried out to identify the most probable number of total coliforms and Escherichia coli. Forty tambatinga specimens were collected. In addition, skin and gill fragments were removed for fungi isolation in culture medium (BDA). Physicochemical and microbiological parameters of water, fish biometry and fungal diversity of fish in the dry and rainy periods were analysed.Results showed significant differences in the total length (TC) and weight (P) of fish in the dry and rainy periods. Microbiological data showed that the water of the four fish farms analysed in both periods are within the limits established by the National Environment Council (CONAMA) of Brazil and within limits established in complementary literature. Regarding the physicochemical parameters of water, only conductivity (F (1, 14) = 8.611; p = 0.011) and temperature had considerable differences (F (1, 14) = 11.037; p = 0.005). There was prevalence of yeasts (33%) and fungi of the genus Fusarium sp. (26%), Penicillium sp. (21%) and Aspegillus sp. (20%). The analysis of fungal diversity showed associations for sex, Aspegillus sp. (X2 = 19,600; DF = 1; p = 0,001) and the dry season, Penicillium sp. (X2 = 8,120; DF = 1; p = 0,004) and Fusarium sp. (X2 = 21.583; GL = 1; p = 0.001). It is concluded, therefore, that the harvests are within the established by the legislation of the National Environment Council-CONAMA in Brazil and complementary literature. However, it is necessary to evaluate the presence of possible mycotoxins in cultivated fish, since the most prevalent fungal species are considered to be mycotoxigenic fungi and are widely disseminated in the environment.

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Análise qualitativa da alimentação e o coeficiente intestinal de Metynnis cf. roosevelti Eigenmann (Characidae, Myleinae), da Lagoa Redonda, Nízia Floresta, Rio Grande do Norte, Brasil

Cited by 5 publications

References 5 publications

Cladocerans from gut contents of fishes associated to macrophytes from Taquari River Basin, MS, Brazil

Cladocerans from gut contents of fishes associated to macrophytes from Taquari River Basin, MS, Brazil

Grazing Unworried: Environmental Changes in a Dammed River Favor the Diet of the Invasive Metynnis Lippincottianus (Characiformes, Serrasalmidae)

Microbiological analysis of water and fish of fish farms in the protection area of the western lowlands of Maranhão, Brazil

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