| host-parasite relationships of monogeneans in gills of astyanax altiparanae and rhamdia quelen of the são francisco verdadeiro river, brazil. | this study investigates the ecology of monogenean gill parasites of aslyanax altiparanae garutti & britski, 2000 and rhamdia quelen (quoy & gaimard, 1824) in a stretch of the sao francisco verdadeiro river, parana, brazil. statistical and ecological indices were used to examine observed levels of parasitism in relation to host and environmental characteristics. a. altiparance and r. quelen had infestation intensities of 2.8 and 23.1 parasites per fish, respectively. the only significant environm ... | 2006 | 17285853 |
| feeding and morphological analysis of the digestive tract of four species of fish (astyanax altiparanae, parauchenipterus galeatus, serrasalmus marginatus and hoplias aff. malabaricus) from the upper paraná river floodplain, brazil. | the present study is inspired by the great wealth of species exhibited by the ichthiofauna. not only concepts and techniques of ecology deserve attention, but also knowledge in other biological areas, such as zoology and anatomy, are necessary. the intention of the present work is to discover the morphology of fish through the study of the digestive tract morphology, associating it to diet data, in order to better understand the biology of four fish species of the upper paraná river floodplain. ... | 2008 | 18833491 |