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31 results for “ornamental fish”
Fig. 2 in Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil
Fig. 2. Karyotype of Baryancistrus xanthellus in conventional staining. The square indicates the pair that bears the nucleolus organizer region (NOR).
Fig. 3 in Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil
Fig. 3. Karyotype of Baryancistrus xanthellus: a) C-banding; b) Mapping of rDNA 18S (red signal) and 5S (green signal) through double FISH.
Fig. 1 in Myxobolus opsaridiumi sp. nov. (Cnidaria: Myxosporea) infecting different tissues of an ornamental fish, Opsaridium ubangiensis (Pellegrin, 1901), in Cameroon: morphological and molecular characterization
Fig. 1. Photomicrographs of Myxobolus opsaridiumi sp. nov. infecting skin, muscle and spleen of Opsaridium ubangiensis (Pellegrin, 1901). A. Fresh myxospores in frontal view. B. Fresh myxospore in lateral view. C. Giemsa-stained myxospores. D. Diagrammatic drawing of a mature myxospore.
Fig. 2 in Myxobolus opsaridiumi sp. nov. (Cnidaria: Myxosporea) infecting different tissues of an ornamental fish, Opsaridium ubangiensis (Pellegrin, 1901), in Cameroon: morphological and molecular characterization
Fig. 2. Photomicrographs of plasmodia of Myxobolus opsaridiumi sp. nov. developing on Opsaridium ubangiensis (Pellegrin, 1901). A. Plasmodium development on the skin. B. Histological section stained with hematoxylin and eosin showing plasmodium situated in the dermis. C. Plasmodium developing within muscle fibers (hematoxylin and eosin). D. Higher magnification of a plasmodium from the muscle fibers.
Fig. 3. A–C in Myxobolus opsaridiumi sp. nov. (Cnidaria: Myxosporea) infecting different tissues of an ornamental fish, Opsaridium ubangiensis (Pellegrin, 1901), in Cameroon: morphological and molecular characterization
Fig. 3. A–C. Photomicrographs of plasmodia of Myxobolus opsaridiumi sp. nov. affecting a spleen of Opsaridium ubangiensis (Pellegrin, 1901). A. Spleen harbouring large plasmodia. B. Whitish plasmodia isolated from each other (black arrows) or arranged in grape-like clusters (white arrow). C. Spleen completely filled with plasmodia. – D–G. Histological sections stained with hematoxylin and eosin of spleens of O. ubangiensis infected with plasmodia of M. opsaridiumi sp. nov. D. Plasmodia implanted on the external region of the spleen. E. Asynchronous development of plasmodia within the spleen. F. Mechanical compression of the cells adjacent to the cysts. G. Higher magnification of plasmodia showing each surrounded by a wall and full of myxospores. Abbreviation: P = plasmodium.
Fig. 4 in Myxobolus opsaridiumi sp. nov. (Cnidaria: Myxosporea) infecting different tissues of an ornamental fish, Opsaridium ubangiensis (Pellegrin, 1901), in Cameroon: morphological and molecular characterization
Fig. 4. Maximum likelihood phylogenetic tree based on the SSU rDNA sequences showing the position of Myxobolus opsaridiumi sp. nov. (in bold) and related species. Accession numbers and infected tissues are listed adjacent to the species names. Numbers at the nodes represent Bayesian posterior probabilities and ML bootstrap percentages. Kudoa thyrsites (Gilchrist, 1924) was used as the outgroup.
Fig. 1 in Invasion risks posed by ornamental freshwater fish trade to southeastern Brazilian rivers
Fig. 1. Cities and watersheds within the Minas Gerais State, Brazil, where the 39 ornamental fish stores were visited.
Fig. 2. A in Invasion risks posed by ornamental freshwater fish trade to southeastern Brazilian rivers
Fig. 2. A model describing the invasion stages that species must pass in order to represent an invasion risk for rivers in Minas Gerais State, Brazil.
Figure 1 in Trophic relationships among three species of ornamental fish from the region of Lake Amanã, Amazon
Figure 1. (A) Feed Strategy Carnegiella marthae. (1) Ephemenoptera (N), Diptera (L + A), Chironomidae (L) and Coleoptera (A); (2) Scales of fish; (3) Fragments of plants and insects. Points over an item indicates that they are overlapped; (B) Feed Strategy Carnegiella strigata. (1) Hymenoptera (A); (2) Coleoptera (A); (3) insect fragments; (4) fragments of plants; (5) Ephemenoptera (N); (6) Lepidoptera (L); (7) Chironomidae (L) and Gerridae (A + L). The points-arrested over an item indicates that they are overlapping; (C) Feed Strategy Gnathocharax steindachneri. (1) Chaoboridae (A); (2) Gerridae (N + A); (3) Hymenoptera (A); (4) fragments of insects; (5) fish scales; (6) Diptera (larvae + adults); (7) Coleoptera (A) and vegetable fragments; (8) Collembola, Homoptera (L) and Lepidoptera (L). Points over an item indicates that they are overlapped.
Data from: Inbreeding and competitor’s genetic relatedness affect dynamic male color-ornament expression in a cichlid fish
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Data from: Recurrent evolution of small body size and loss of the sword ornament in Northern swordtail fish
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Data from: Parental response to intruder females altered by ornamentation and mate quality in a biparental fish
In many monogamous species females behave aggressively toward other females, as they may threaten their exclusive access to paternal resources. However, in species with a high degree of breeding asynchrony not all females are true reproductive rivals. Female ornamentation that advertises sexual receptivity is a possible mechanism whereby parental females could assess the potential threat of rival females and attack only those which could challenge their mating status. Convict cichlids (Amatitlania siquia) are sexually dichromatic, monogamous fish that exhibit biparental care. Females develop gold ventral coloration when reproductively receptive and actively court males. We presented breeding pairs of convict cichlids with confined conspecific females to investigate whether parental response was affected by the intruder's reproductive status. We also investigated whether differences in partner quality within breeding pairs mediated the response to intruders, as mate quality influences both intra- and intersexual dynamics in many monogamous species. We found parental females responded more aggressively to reproductive intruders and that parental females mated to high quality males decreased the aggression they directed at general brood predators during the reproductive intruder presentation. Contrary to our predictions, we also found that males behaved aggressively toward reproductive intruders, particularly when paired with small females. Our results indicate that both parents engage in pair-bond defense and that differences in partner quality determine the level of aggression directed at extra-pair reproductive females. These findings suggest that when biparental care greatly increases offspring survival, reproductive success for both sexes may be maximized by cooperation and coordination, rather than conflict.
Fig. 1 in Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil
Fig. 1. Live photograph of Baryancistrus xanthellus, LIA 1629.
The stabilising impact of natural selection on the allometry of sexual ornaments: Fish that escape locomotor constraints exhibit extravagant ornamentation
<p>1. Positive allometry has been considered a hallmark of sexual selection whereby larger males of superior condition develop disproportionately larger ornaments for their body size compared to smaller males of poorer condition.</p> <p>2. Yet many structures known to be sexually selected often exhibit other allometric patterns. This has led to controversy over the utility of allometry in adequately capturing the signature of sexual selection, particularly if static (within population) and evolutionary (across species) allometries are functionally constrained by stabilising natural selection.</p> <p>3. To investigate this, we evaluated the allometries of ornamental head crests and dorsal fins across multiple species of blenny fish. In particular, we compared species that occupied an aquatic environment—where swimming performance was expected to have constrained ornament size—with species that have transitioned onto land where such biomechanical constraints on ornament size have been removed.</p> <p>4. Static allometries of both head crest and dorsal fin ornaments were found to be positive in males, but less so in females, across all species examined. This was consistent with the allometric theory of sexual selection that predicts positive allometry specifically in male ornamentation. Nevertheless, male allometric slopes were constrained in aquatic species whereas males of terrestrial species were free to exaggerate the size of their ornaments. Natural selection therefore appears to suppress ornament size in aquatics because of the biomechanical constraints associated with swimming. These differences in within-population static allometry between aquatic and terrestrial species in turn manifested in a greater across-species evolutionary allometric intercept, but not slope, for terrestrial species relative to aquatic and species.</p> <p>5. These findings indicate that the study of ornament allometries can provide useful insights into the role of sexual selection on ornament elaboration and also help reveal the presence of opposing natural selection that might result in alternative allometric patterns. The relationship between static and evolutionary allometries remains complex, and our results caution against the interpretation of evolutionary allometry in the absence of a clear understanding of the underlying static allometries associated with it.</p>
Fig. 2 in First report on the occurrence of two marine ornamental fishes (Acanthuriformes) from Northern part of the Bay of Bengal, India
Fig. 2 — Zanclus cornutus (Linnaeus, 1758)
Fig. 1 in First report on the occurrence of two marine ornamental fishes (Acanthuriformes) from Northern part of the Bay of Bengal, India
Fig. 1 — Acanthurus xanthopterus Valenciennes, 1835
The stabilising impact of natural selection on the allometry of sexual ornaments: Fish that escape locomotor constraints exhibit extravagant ornamentation
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Data from: Parental response to intruder females altered by ornamentation and mate quality in a biparental fish
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Figure 6 from: Sampaio FDF, Silva-de-Assis HC, Bettim FL, Fávaro LF, Freire CA (2019) Water acidification causes death of marine ornamental fish (Perciformes: Pomacentridae) during transport: contributing to the conservation of wild populations. Zoologia 36: 1-10. https://doi.org/10.3897/zoologia.36.e25083
Figure 6 Transport water volume (ml) per gram of fish weight versus total body length (cm). Black circles, fish that were alive at the end of the experiment; white circles, fish that died during the experiment. Vertical and horizontal dashed lines respectively indicate maximum suggested length for the transport of A.saxatilis (6 cm) to ensure survival, and maximum water volume/fish weight relationship (125 ml/g fish) to minimize transport costs.
Figures 4-5 from: Sampaio FDF, Silva-de-Assis HC, Bettim FL, Fávaro LF, Freire CA (2019) Water acidification causes death of marine ornamental fish (Perciformes: Pomacentridae) during transport: contributing to the conservation of wild populations. Zoologia 36: 1-10. https://doi.org/10.3897/zoologia.36.e25083
Figures 4-5 Relationship between weight (g) and total length (cm) of A.saxatilis: (4) weight (g) as a function of the total length (cm) of the fish. Black circles, fish that were alive at the end of the experiment (n = 53); white circles, fish that died during the experiment (n = 14). (5) Weight/length ratio versus fish length, with separate linear regressions for living (solid line) and dead (dashed line) fish, and respective r2 values.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.