Ritmicidade da alimentação e dieta de Metynnis roosevelti Eigenmann (Characidae, Myleinae) da Lagoa do Jiqui, Parnamirim, Rio Grande do Norte, Brasil

Canan, Bhaskara; Gurgel, Hélio de Castro Bezerra

doi:10.1590/s0101-81752002000200001

Cited by 5 publications

(6 citation statements)

References 7 publications

(3 reference statements)

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“…In this paper we focus on the species Metynnis hypsauchen Müller & Troschel, 1844, known as the ''silver dollar fish'' or ''silver dollar pacu'' (Folle 1997). These animals form small schools, and may total hundreds of individuals in rivers and lakes, mainly concentrated in areas with macrophytes, especially when these are fruiting (Canan and de Gurgel 2002). In the Amazon they are generally sold as ornamental fish (Machado 2016) and have production peaks at the end of the dry season and beginning of flooding, with external fertilization and no parental care, in spawning runs involving short distances (Zeinad and de Prado 2012).…”

Section: Introductionmentioning

confidence: 99%

Henneguyosis in gills of Metynnis hypsauchen: an Amazon freshwater fish

et al. 2019

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This study describes aspects of infection caused by Myxozoa of the genus Henneguya sp. in gills of fish belonging to the species Metynnis hypsauchen. Two sampling were made in the Capim river, close to the Ribeira community, in the municipality of Ipixuna do Pará, State of Pará, Brazil, during the months of August 2018 and March 2019. The animals were captured and transported live to the Laboratório de Pesquisa Carlos Azevedo, at the Universidade Federal Rural da Amazônia (UFRA), in Belém, Pará, Brazil. The animals were examined, and after parasitism was confirmed, Differential Interference Contrast Microscopes were used, to evaluate the parasite spores. Ziehl-Neelsen stain techniques were used in histology. Necroscopic analyses of Metynnis hypsauchen specimens found parasites in 80% of the hosts (16/20), with whitish-colored cysts in the branchial filaments, containing mature spores of the genus Henneguya. The histopathological analysis indicated large areas with cystic lesions with associated ischemic necrosis. The descriptions from this study indicate that the parasite drastically compromises the host's respiratory system. Additionally, it is worth noting that parasite fauna studies of fishes in the Capim river are still a vast topic for research; this is the first record of infection by Henneguya sp. in Metynnis hypsauchen, captured in the Capim river in Ipixuna do Pará.

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Section: Introductionmentioning

confidence: 99%

Henneguyosis in gills of Metynnis hypsauchen: an Amazon freshwater fish

et al. 2019

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“…Additional male behaviours and morphological characters, such as courtship displays and fin colour and shape, also appear to play a role in mate choice in many fishes (Forsgren et al ., ), with fin variation being commonly observed in various fish groups (Py Daniel & Cox‐Fernandes, ). The differences in male and female anal‐fin shape observed herein is often used as a character in the study of Characidae systematics (Miquelarena & Aquino, ; Canan & Gurgel, ; Miquelarena & Aquino, ; Bertaco & Lucinda, ; Carvalho, ; Carvalho & Bertaco, ; Matheus, ; Bertaco et al, ; Carvalho et al, ; Lucena & Malabarba, ; Carvalho, ; Jerep & Malabarba, ). Nevertheless, there can be intrageneric variation in this pattern; for example, anal‐fin shape is similar in males and females of H. togoi (Oyakawa et al, ) and Hyphessobrycon nicolasi Miquelarena & López, (Miquelarena & López, ).…”

Section: Discussionmentioning

confidence: 92%

“…Fishes can also show sexual dimorphism in the shape of caudal, pelvic, pectoral and anal fins (Py Daniel & Cox‐Fernandes, ). Sex differences in fin shape, size and coloration have been reported for many species of Characidae (Miquelarena & Aquino, ; Canan & Gurgel, ; Miquelarena & Aquino, ; Bertaco & Lucinda, ; Carvalho, ; Carvalho & Bertaco, ; Matheus, ; Miquelarena & López, ; Oyakawa et al, ; Bertaco et al, ; Alcaraz et al, ; Menezes & Weitzman, ; Zanata & Camelier, ; Carvalho et al, ; Lucena & Malabarba, ; Miquelarena & López, ; Zanata & Camelier, ; Jerep & Malabarba, ; Camelier & Zanata, ). The development of bony hooks on fin rays (Fig.…”

Section: Introductionmentioning

confidence: 96%

Development of secondary sexual characters and their relationship to ontogeny and seasonal reproductive period in Hyphessobrycon igneus (Ostariophysi: Characiformes)

Longoni

Giora

Fialho

2017

Journal of Fish Biology

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Sexual dimorphism in size, anal-fin shape and coloration of Hyphessobrycon igneus, Characidae, were examined. Males were more frequent at larger body sizes, confirming body size as a sexually dimorphic trait. Anal-fin shape and the colour of all fins were the same for females and juveniles, differing only in adult males. Likewise, only adult males had bony hooks on fin rays; larger and more sexually mature males had the most numerous and developed hooks and hooks were most developed in degree and number during peak reproductive periods. Fin hooks regressed in number and developmental degree after the reproductive period, but restarted development with the beginning of the new reproductive period without completely disappearing. Results show that bony hooks have a development and regression cycle related to reproductive seasonality.

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“…The paraphyly of Tometes in our phylogeny may suggest the sharp incisiform teeth critical in distinguishing Tometes from other myleines are misleading. Finally, several species of Metynnis are partially to entirely planktivorous, a novelty for serrasalmids and a hallmark for the Metynnis clade in general (Canan & Gurgel, 2002) (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

Phylogenomics of piranhas and pacus (Serrasalmidae) uncovers how convergent diets obfuscate traditional morphological taxonomy

Kolmann

Hughes

Hernández

et al. 2020

Preprint

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The Amazon and neighboring South American river basins harbor the world’s most diverse assemblages of freshwater fishes. One of the most prominent South American fish families are the Serrasalmidae (pacus and piranhas), found in nearly every continental basin. Serrasalmids are keystone ecological taxa, being some of the top riverine predators as well as the primary seed dispersers in the flooded forest. Despite their widespread occurrence and notable ecologies, serrasalmid evolutionary history and systematics are controversial. For example, the sister taxon to serrasalmids is contentious, the relationships of major clades within the family are obfuscated by different methodologies, and half of the extant serrasalmid genera are suggested to be non-monophyletic. We used exon capture to explore the evolutionary relationships among 64 (of 99) species across all 16 serrasalmid genera and their nearest outgroups, including multiple individuals per species in order to account for cryptic lineages. To reconstruct the timeline of serrasalmid diversification, we time-calibrated this phylogeny using two different fossil-calibration schemes to account for uncertainty in taxonomy with respect to fossil teeth. Finally, we analyzed diet evolution across the family and comment on associated changes in dentition, highlighting the ecomorphological diversity within serrasalmids. We document widespread non-monophyly within Myleinae, as well as between Serrasalmus and Pristobrycon, and propose that reliance on traits like teeth to distinguish among genera is confounded by ecological convergence, especially among herbivorous and omnivorous taxa. We clarify the relationships among all serrasalmid genera, propose new subfamily affiliations, and support hemiodontids as the sister taxon to Serrasalmidae.

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Ritmicidade da alimentação e dieta de Metynnis roosevelti Eigenmann (Characidae, Myleinae) da Lagoa do Jiqui, Parnamirim, Rio Grande do Norte, Brasil

Cited by 5 publications

References 7 publications

Henneguyosis in gills of Metynnis hypsauchen: an Amazon freshwater fish

Henneguyosis in gills of Metynnis hypsauchen: an Amazon freshwater fish

Development of secondary sexual characters and their relationship to ontogeny and seasonal reproductive period in Hyphessobrycon igneus (Ostariophysi: Characiformes)

Phylogenomics of piranhas and pacus (Serrasalmidae) uncovers how convergent diets obfuscate traditional morphological taxonomy

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