| proteocephalus chamelensis n. sp. (cestoda: proteocephalidae) from the "guavina" gobiomorus maculatus (osteichthyes: eleotrididae) in chamela bay, jalisco, méxico. | a new species of proteocephalus inhabiting the eleotridid estuarine fish gobiomorus maculatus is described from chamela bay, jalisco state, mexico. the new species and p. pugetensis are nearly identical in strobila length, presence of a vestigial apical organ, having vaginae only anterior to the cirrus sac, an average of 4-7 uterine diverticula per proglottis, and a ratio of cirrus sac length to proglottis width averaging approximately 1:4. proteocephalus pugetensis differs from the new species ... | 1995 | 7472872 |
| 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 |
| new host and ocean records for the copepod ommatokoita elongata (siphonostomatoida: lernaeopodidae), a parasite of the eyes of sleeper sharks. | seven of 8 pacific sleeper sharks (somniosus pacificus bigelow and schroeder, 1944) captured in prince william sound, alaska, were actively infected, and all 8 had been at one time infected with the parasitic copepod ommatokoita elongata (grant, 1827) (siphonostomatoida: lernaeopodidae). active infections consisted of adult females and chalimus larvae that had attached to the corneas of the sharks' eyes. this report documents a new host record and possibly the only reliable record of this parasi ... | 1998 | 9920328 |
| ocular lesions associated with attachment of the copepod ommatokoita elongata (lernaeopodidae: siphonostomatoida) to corneas of pacific sleeper sharks somniosus pacificus captured off alaska in prince william sound. | twenty eyes from 10 pacific sleeper sharks somniosus pacificus, infected with the copepod ommatokoita elongata, were collected in prince william sound, alaska, and the eyes of an additional 18 s. pacificus captured in the same area were inspected for copepods. prevalence of infection by adult female o. elongata was 97% (n = 28); mean intensity of infection was 1.89 (+/-1sd = 0.32) adult female copepods per infected shark and 1.0 (+/- 1sd = 0.0) adult female copepods per infected eye. five of the ... | 2002 | 12099414 |
| new records for dinemoura ferox (copepoda: siphonostomatoida: pandaridae) from pacific sleeper sharks captured in waters off eastern taiwan. | four of the 27 pacific sleeper sharks (somniosus pacificus bigelow and schroeder) captured in the western north pacific ocean off eastern taiwan between 19 march and 18 may 2002 hosted the parasitic copepod dinemoura ferox (krøyer, 1838) on their body surface including the fins. this report documents a new host record as well as a new ocean record for d. ferox, which until now has only been reported from the benthopelagic sharks, somniosus microcephalus (bloch and schneider) and centrophorus squ ... | 2003 | 14627163 |
| essential and non-essential element concentrations in two sleeper shark species collected in arctic waters. | a number of elements/metals have increased in arctic biota and are of concern due to their potential toxicity. most studies on elements in the arctic have focused on marine mammals and seabirds, but concentrations in the greenland shark (somniosus microcephalus) and pacific sleeper shark (somniosus pacificus), the only two shark species known to regularly inhabit arctic waters, have never been reported. to address this data gap, concentrations and patterns of 25 elements were analyzed in liver o ... | 2007 | 17182159 |
| pacific sleeper shark somniosus pacificus trophic ecology in the eastern north pacific ocean inferred from nitrogen and carbon stable-isotope ratios and diet. | stable-isotope ratios of nitrogen (δ¹⁵n) and lipid-normalized carbon (δ¹³c') were used to examine geographic and ontogenetic variability in the trophic ecology of a high latitude benthopelagic elasmobranch, the pacific sleeper shark somniosus pacificus. mean muscle tissue δ¹³c' values of s. pacificus differed significantly among geographic regions of the eastern north pacific ocean. linear models identified significant ontogenetic and geographic variability in muscle tissue δ¹⁵n values of s. pac ... | 2012 | 22497395 |
| predicting synergistic effects of resources and predators on foraging decisions by juvenile steller sea lions. | many theoretical and experimental studies suggest that synergistic interactions between resources and predators influence foraging decisions and their fitness consequences. this framework, however, has been ignored almost completely by hypotheses on causes of the population decline of steller sea lions (ssls) (eumetopias jubatus) in western alaska. by comparing predictions from a dynamic state variable model to empirical data on the behaviour of individuals instrumented with satellite-linked tim ... | 2009 | 18953573 |
| [diversity, abundance and icthyofaunistic groups of the chantuto-panzacola lagoon-estuarine system, chiapas, méxico]. | in the chantuto-panzacola system, chiapas, méxico, a study of a fish community was carried out between march and november of 1997. from a total of 1456 fish collected, 31 species, 25 genera and 19 families had been identified. the diversity and abundance were high in march with h'= 2.67 bits/ind, d = 3.89 sp/ind, biomass 1.88 g/m2. density 0.25 ind/m2 and average weight 7.55 g/ind. significant differences were found between the ecological parameters and the environmental variables of the ecosyst ... | 2004 | 17357416 |
| three new procamallanus (spirocamallanus) species from freshwater fishes in mexico. | the following 3 new species of procamallanus (spirocamallanus) are described from the intestines of freshwater fishes in mexico, all belonging to the morphological group characterized by the presence of wide caudal alae, 3 pairs of subventral preanal papillae, and unequal spicules in the male: procamallanus (spirocamallanus) jaliscensis n. sp. (type host: agonostomus monticola) and procamallanus (spirocamallanus) gobiomori n. sp. (hosts: gobiomorus maculatus [type host], gobiomorus polylepis and ... | 2000 | 10701574 |