| morphology of gnathostoma spp. isolated from natural hosts in sinaloa, mexico. | gnathostomosis is an emerging public health problem in sinaloa, mexico, where an increasing number of human cases have been diagnosed since 1989. the present study was carried out to determine the presence of the parasite in other natural hosts from the area. birds, fish, opossums and raccoons were captured from local dams and lagoons. the flesh from bird and fish specimens was ground and examined under a 100 w light bulb. larvae were processed for light and electron microscopy. a total of 368 a ... | 2002 | 12107456 |
| confirmation of gnathostoma binucleatum almeyda-artigas, 1991, advanced third-stage larvae in tres palos lagoon, mexico, by morphological and molecular data. | advanced third-stage larvae of gnathostoma sp. corresponding to 6 morphotypes, distinguished on the basis of the shape of the cephalic hooklets, were collected from the muscle tissue of 5 species of freshwater fish (i.e., dormitator latifrons, eleotris picta, gobiomorus maculatus, ariopsis guatemalensis, and cichlasoma trimaculatum) in tres palos lagoon, guerrero, mexico. principal components analysis of 4 morphological characters cluster all samples in a single taxonomic group. a minimum amount ... | 2005 | 17089777 |
| estuarine fish and turtles as intermediate and paratenic hosts of gnathostoma binucleatum in nayarit, mexico. | human gnathostomosis is a severe public health problem in the state of nayarit, mexico. between 1995 and 2005, the registration of human cases numbered 6,328, which makes it one of the largest focal points of the disease in the country. the present study determined the presence of natural hosts of gnathostoma binucleatum larvae at the laguna de agua brava in nayarit, mexico. a total of 5,450 fish and 247 turtles were sampled. muscular tissue was ground and observed against the light using a 100- ... | 2007 | 17924145 |
| temporal variation in the helminth parasite communities of the pacific fat sleeper, dormitator latifrons, from tres palos lagoon, guerrero, mexico. | temporal variation in the helminth parasite communities of the pacific fat sleeper, dormitator latifrons, from tres palos lagoon, guerrero, mexico, was studied at the component community and infracommunity levels. in total, 185 host specimens were collected between april 2000 and march 2001. eight parasite species were identified: clinostomum complanatum, echinochasmus leopoldinae, ascocotyle (phagicola) longa, pseudoacanthostomum panamense, saccocoelioides sp., parvitaenia cochlearii, neoechino ... | 2008 | 18564733 |
| identification of estuarine fish dormitator latifrons as an intermediate host and eleotris picta as a paratenic host for gnathostoma binucleatum in sinaloa, mexico. | gnathostomosis is a typical fish-borne zoonotic parasitosis and is currently a serious public health issue in mexico. among several gnathostoma species present in wild animals in mexico, gnathostoma binucleatum is the only proven species responsible for human diseases, and the advanced third stage larvae (al3) of g. binucleatum have been found in over 20 species of fish in this country. in sinaloa state, two fish species, dormitator latifrons and eleotris picta, were heavily contaminated with g. ... | 2008 | 18719943 |
| spatial and temporal variation of fish assemblages in a coastal lagoon of the biosphere reserve la encrucijada, chiapas, mexico. | composition and abundance of the ichthyofauna in estuarine and coastal lagoon systems of the south pacific in mexico have been scarcely studied. in particular, there is a lack of information on how environmental variables determine the spatio-temporal structure of fish assemblages in those habitats. in this study, fishes were sampled by drop net during twelve months (may 2004 - april 2005) in 22 sites distributed along the carretas-pereyra lagoon, located in the biosphere reserve la encrucijada, ... | 2008 | 19256428 |
| seasonal patterns in metazoan parasite community of the "fat sleeper" dormitator latifrons (pisces: eleotridae) from tres palos lagoon, guerrero, mexico. | dormitator is among the most important fish genera in the mexican pacific coastal lagoon systems. in tres palos lagoon, the fat sleeper dormitator latifrons is one of the most significant species based on catch volume, although it is only consumed locally. very little information exists on this species' parasitofauna. composition and temporal variation in the metazoan parasite community structure of dormitator latifrons from tres palos lagoon (99 degrees 47' w, 16 degrees 48' n), guerrero, mexic ... | 2008 | 19419054 |
| nutrient removal in a closed silvofishery system using three mangrove species (avicennia germinans, laguncularia racemosa, and rhizophora mangle). | the removal of ammonium (nh4(+)), nitrite (no2(-)), nitrate (no3(-)), and phosphate (po4(-3)) in a closed silvofishery system was examined using three mangrove species (i.e., avicennia germinans, laguncularia racemosa, and rhizophora mangle). specifically, six closed tanks were installed for this experiment with a population of 60 dormitator latifrons fishes per tank. we planted 40 seedlings in each of three experimental tanks separated by species, while the remaining tanks were used as control. ... | 2015 | 25499182 |
| description of a new species of neoechinorhynchus (acanthocephala: neoechinorhynchidae) a parasite of dormitator latifrons from southwestern mexico based on morphological and molecular characters. | neoechinorhynchus mamesi n. sp. is described from the estuarine fish dormitator latifrons collected in 3 localities along the coast of chiapas state in southwestern mexico. the new species is characterized by possessing a small trunk, a very small proboscis with relatively very long apical proboscis hooks and small middle and posterior hooks, 2 giant nuclei in the ventral body wall, and males with testes smaller than the cement gland. a multivariate analysis of variance (manova) and a principal ... | 2012 | 22735297 |
| frequency coding of particle motion by saccular afferents of a teleost fish. | the saccule is known to play an important role in hearing in fishes. in this study we investigated spatial frequency selectivity of single saccular afferents in a teleost fish (the sleeper goby, dormitator latifrons) to acoustic particle motion at 50-400 hz. saccular afferents have similar distributions of best sensitivity (-90.0 to -54.8 db re. 1 g, mean +/- s.d.=-81.1+/-8.0 db) and characteristic frequencies (<or=50-400 hz, median=80 hz) along the longitudinal, side-to-side and dorsoventral ax ... | 2010 | 20400645 |
| auditory physiology and anatomy of octavolateral efferent neurons in a teleost fish. | vertebrate hair cell systems receive innervation from efferent neurons in the brain. here we report the responses of octavolateral efferent neurons that innervate the inner ear and lateral lines in a teleost fish, dormitator latifrons, to directional linear accelerations, and compare them with the afferent responses from the saccule, the main auditory organ in the inner ear of this species. efferent neurons responded to acoustic stimuli, but had significantly different response properties than s ... | 2006 | 16180037 |
| octavolateral projections and organization in the medulla of a teleost fish, the sleeper goby (dormitator latifrons). | this study is the first to employ simultaneous labeling with different colored fluorescent dyes and confocal microscopy to investigate the central projections of the octavolateral nerves in any fish. three-dimensional reconstructions of the hindbrain octavolateral nuclei were made and overlap of octavolateral projections was assessed in a teleost, the sleeper goby (dormitator latifrons). the octavolateral nerves, which innervate the otolithic organs, semicircular canals, and lateral lines, proje ... | 2005 | 15558734 |
| coding of acoustic particle motion by utricular fibers in the sleeper goby, dormitator latifrons. | it is unknown whether the fish utricle contributes to directional hearing. here, we report response properties of single utricular fibers in a teleost fish ( dormitator latifrons) to linear accelerations at various stimulus frequencies and axes. characteristic frequencies ranged from < or =50-400 hz (median=80 hz), and best frequencies shifted from 50 to 250 hz with stimulus level. best sensitivity of utricular fibers was distributed from -70 to -40 db re: 1 g (mean=-52 db), which is about 30 db ... | 2004 | 15316732 |
| acoustic response properties of lagenar nerve fibers in the sleeper goby, dormitator latifrons. | auditory and vestibular functions of otolithic organs vary among vertebrate taxa. the saccule has been considered a major hearing organ in many fishes. however, little is known about the auditory role of the lagena in fishes. in this study we analyzed directional and frequency responses from single lagenar fibers of dormitator latifrons to linear accelerations that simulate underwater acoustic particle motion. characteristic frequencies of the lagenar fibers fell into two groups: </=50 hz and 80 ... | 2003 | 14586545 |
| effects of saccular otolith removal on hearing sensitivity of the sleeper goby (dormitator latifrons). | it is not known to what extent the entire saccule contributes to overall hearing sensitivity in any fish species. here we report directional and frequency sensitivity in a teleost fish (dormitator latifrons) and effects of unilateral and bilateral removal of saccular otoliths on its hearing sensitivity. the fish had different hearing thresholds in the horizontal (-54.4 to -50.3 db re: 1 micro m) and mid-sagittal (-58.6 to -53.1 db) planes. at 100 hz, unilateral otolith removal did not significan ... | 2002 | 12355235 |
| morphological polarizations of sensory hair cells in the three otolithic organs of a teleost fish: fluorescent imaging of ciliary bundles. | it has been suggested that the morphological polarity of sensory hair cells in the otolithic organs plays important roles in directional hearing in fish. in this study, we examined the hair cell polarization patterns in the saccule, utricle, and lagena of a teleost fish, the sleeper goby (dormitator latifrons). in contrast to using traditional scanning electron microscopy, we employed a simple and rapid method that enabled us to map the hair cell polarization patterns using immunocytochemical an ... | 1998 | 9872133 |
| encoding of acoustic directional information by saccular afferents of the sleeper goby, dormitator latifrons. | this paper reports on directional response properties of saccular afferents of the sleeper goby, dormitator latifrons, to 100-hz acoustic particle motions with a focus on testing the hypothesis that the response directionality of a fish's auditory afferents derives from the morphological polarity of sensory hair cells in the otolithic organs. spontaneous rates (sr) and best sensitivities (bs) of saccular afferents ranged from 0 to 162 spikes/sec and from 0.2-to 100-nm rms displacement. sr did no ... | 1998 | 9631556 |