| redescription of perezitrema bychowskyi (caballero & caballero, 1975) (trematoda: macroderoididae), with remarks on the systematic status of perezitrema barus & moravec, 1996. | a description is given of perezitrema bychowskyi (caballero & caballero, 1975) based on newly collected specimens from the intestine of the tropical gar atractosteus tropicus gill in the pantalos de centla biological reserve, state of tabasco, southeastern mexico, collected in april 2001, and on a re-examination of the type-specimens. in contrast to the original description, the excretory vesicle of p. bychowskyi was found to be elongate saccular and the intestinal caeca join near the posterior ... | 2002 | 12510165 |
| [histology of reproductive cycle of tropical gar atractosteus tropicus females (lepisosteiformes: lepisosteidae) in tabasco, mexico]. | in southeast mexico, a. tropicus is a species with great ecological, economic, cultural and aquaculture value, however wild populations have diminished due to diverse anthropological causes. the objective of this study was to characterize the reproductive cycle of a. tropicus, with a description of complete gonad structure and the changes in germinal and somatic elements during oogenesis, for better management and use of this species. six sexually mature females (n=72) were captured monthly with ... | 2012 | 23342534 |
| using cornstarch in microparticulate diets for larvicultured tropical gar (atractosteus tropicus). | aquaculture in mexico has been developed by the cultivation of commercial species. in tabasco, the cultivation of native species is mainly limited by the lack of nutrition studies to support its crop profitability. among these species is the tropical gar (atractosteus tropicus), which has great potential for cultivation. however, the nutritional value of carbohydrates in diets for this species which contribute to improved growth and survival, have not been evalulated,. thus, in the present inves ... | 2016 | 26573856 |
| cystoopsis atractostei n. sp. (nematoda: cystoopsidae) from the subcutaneous tissue of the tropical gar, atractosteus tropicus (pisces), in mexico. | a new species of parasitic nematode, cystoopsis atractostei (trichinelloidea: cystoopsidae), is described based on female specimens recovered from the subcutaneous tissue of the tropical gar, atractosteus tropicus gill (lepisosteiformes: lepisosteidae), from 2 localities (canal nueva esperanza and canal tabasquillo) of the pantanos de centla biological reserve, state of tabasco, southeastern mexico, collected in april 2001. the total prevalence was 13%, and the mean intensity of infection was 1 ... | 2003 | 12659316 |
| [karyotype of the tropical gar atractosteus tropicus (lepisosteiformes: lepisosteidae) and chromosomal variation in their larval and adults]. | the karyotype of the tropical gar atractosteus tropicus is described from conventional giemsa-staining of 295 mitotic chromosome slides from 120 larvae and 15 adults (five females and ten males) from tabasco, southern of mexico. the diploid number 2n = 56 chromosomes was calculated (73 spreads from 206 larval and 208 adult metaphases). variation on chromosome number was from 46 (4.4%) to 64 (3.9%) chromosome elements on larval samples, whereas 58 (11.7%) chromosomes were the second most abundant ... | 2009 | 19928452 |
| helminth parasites of the tropical gar, atractosteus tropicus gill, from tabasco, mexico. | a total of 8 helminth species were recorded in an examination of 43 tropical gar, atractosteus tropicus gill, collected at the pantanos de centla biosphere reserve, tabasco, mexico. the parasite species included 1 adult trematode, 3 metacercariae, 1 cestode, 1 adult nematode, and 2 nematode larvae. six of these 8 species were rare, with low prevalence (< 17%) and abundance (< 1.0 helminths per examined fish). the larvae of contracaecum sp. were the most abundant in the sample, constituting 60% o ... | 2004 | 15165047 |