| environmental and physiological conditions affecting tetrahymena sp. infection in guppies, poecilia reticulata peters. | parasitic infections caused by tetrahymena sp. constitute a serious problem in guppies, poecilia reticulata. tetrahymena was isolated from skin lesions of naturally infected guppies in a commercial aquaculture farm, cultured in vitro and used in subsequent experimental infections. in addition to guppies, angelfish, pterophyllum scalare, platyfish, xiphophorus maculates, and neontetra, paracheirodon innesi, were susceptible, whereas tilapia (oreochromis niloticus xo. aureus) was resistant. the ci ... | 2005 | 16266327 |
| additional novel cryptosporidium genotypes in ornamental fishes. | current knowledge on the prevalence and genotypes of cryptosporidium in fishes is still limited. this study investigated the prevalence of cryptosporidium species in 171 ornamental fishes, belonging to 33 species, collected from 8 commercial aquariums around perth, western australia. all samples were screened by nested pcr targeting the 18s rrna locus. a total of 6 positives were identified by pcr at the 18s locus from 4 different species of fishes (red eye tetra, moenkhausia sanctaefilomenae; g ... | 2012 | 22819587 |
| expansion of the known host range of the microsporidium, pseudoloma neurophilia. | the microsporidium, pseudoloma neurophilia, is the most common infectious organism found in laboratory zebrafish colonies. many currently used zebrafish lines originally came from pet store fish, and the initial description of p. neurophilia came from zebrafish obtained from a retail pet store. however, as p. neurophilia has not been described from wild-caught zebrafish, whether p. neurophilia is a natural pathogen of zebrafish is an open question. the pooling of fish of different species in the ... | 2016 | 27182659 |
| pleistophora hyphessobryconis (microsporidia) infecting zebrafish danio rerio in research facilities. | zebrafish danio rerio are important models for biomedical research, and thus, there is an increased concern about diseases afflicting them. here we describe infections by pleistophora hyphessobryconis (microsporidia) in zebrafish from 3 laboratories. as reported in other aquarium fishes, affected zebrafish exhibited massive infections in the skeletal muscle, with no involvement of smooth or cardiac muscle. in addition, numerous spores within macrophages were observed in the visceral organs, incl ... | 2010 | 20853741 |
| supracellular microtubule alignments in cell layers associated with the secretion of certain fish scales. | intercellularly aligned microtubule arrays are present in cell layers associated with the growth and secretion of scales in the zebra fish brachydanio rerio and the neon tetra fish hyphessobrycon innesi. the layers in question are: the osteoblast layer that covers the ossified outer surface of a scale, and the layer of fibroblasts that is situated immediately underneath the inner collagenous surface of a scale's fibrillary plate. in certain osteoblasts, the proximal portions of microtubules (wit ... | 1986 | 3308914 |
| differences in shoaling behavior in two species of freshwater fish (danio rerio and hyphessobrycon herbertaxelrodi). | fish can gain significant adaptive advantages when living in a group and they exhibit a wide variety of types of collective motion. the scientific literature recognizes 2 main patterns: shoals (aggregations of individuals that remain close to each other), and schools (aggregations of aligned, or polarized, individuals). we analyzed the collective motion of 2 social fish species, zebrafish (danio rerio) and black neon tetra (hyphessobrycon herbertaxelrodi), and compared their patterns of movement ... | 2016 | 27512821 |
| circadian motile activity of erythrophores in the red abdominal skin of tetra fishes and its possible significance in chromatic adaptation. | the red abdominal skin of the neon tetra paracheirodon innesi and the cardinal tetra p. axelrodi was found to blanch at night or in the dark. melatonin added to the bathing medium caused blanching of the red skin. microscopic observations of the erythrophores indicated that the erythrosomes aggregated in response to norepinephrine, melanin-concentrating hormone (mch), and melatonin. of these compounds, melatonin was the most effective. by contrast, many erythrophores were refractory to mch. alph ... | 1993 | 8502623 |