Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-21T18:23:16Z No. of bitstreams: 1 LenildaTeixeiraDaSilva_DISSERT.pdf: 9447586 bytes, checksum: d37926a108960b1f1abce78ad4149e93 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-27T21:40:12Z (GMT) No. of bitstreams: 1 LenildaTeixeiraDaSilva_DISSERT.pdf: 9447586 bytes, checksum: d37926a108960b1f1abce78ad4149e93 (MD5) / Made available in DSpace on 2017-03-27T21:40:12Z (GMT). No. of bitstreams: 1 LenildaTeixeiraDaSilva_DISSERT.pdf: 9447586 bytes, checksum: d37926a108960b1f1abce78ad4149e93 (MD5) Previous issue date: 2016-06-21 / A Detritivoria ? comum em peixes dulc?colas, sobretudo na regi?o neotropical, e para muitas esp?cies s?o escassas as informa??es sobre o trato digest?rio, como ? o caso da esp?cie Steindachnerina notonota, na qual, tem import?ncia ecol?gica como elo da cadeia alimentar, servindo de alimento para os peixes carn?voros, e atuando na depura??o dos ecossistemas aqu?ticos sujeitos ? polui??o org?nica. O objetivo do presente estudo consiste em analisar as adapta??es morfol?gicas do trato digest?rio, desta esp?cie end?mica da caatinga, regi?o do semi?rido brasileiro. Assim, foram utilizados 10 esp?cimes adultos (machos e f?meas), necropsiados, para an?lises macrosc?picas e microsc?picas do trato digest?rio. Todas as estruturas foram observadas no estereomicrosc?pio. Os ?rg?os foram fixados em formol 10% e submetidos ? colora??o de Hematoxilina e Eosina, e PAS - ?cido Peri?dico Schiff (rastros branquiais, ?rg?o epibranquial, es?fago, est?mago, intestino m?dio e intestino posterior) e analisados em microscopia de luz. Os rastros branquiais tamb?m foram fixados em paraformalde?do 10% para an?lise em microscopia eletr?nica de varredura. Os esp?cimes analisados possu?am comprimento total entre 6,4 a 13 cm, comprimento padr?o entre 4,8 a 10,3 cm, e peso de 3,23 a 35,92 g. As adapta??es estruturais no trato digest?rio foram: boca do tipo terminal; o particular complexo bucofar?ngeo; aus?ncia de dentes e da l?ngua; tem tr?s tipos de formatos de rastros branquiais com c?lulas mucosas e bot?es gustativos; possui o ?rg?o epibranquial com suas peculiaridades; um est?mago mec?nico com musculatura muito desenvolvida na regi?o pil?rica; e um intestino muito longo e enovelado, que tem internamente uma exclusiva prega helicoidal. Os aspectos morfol?gicos do trato digest?rio de S. notonota t?m rela??o ao h?bito alimentar especializado detrit?voro-ili?fago. / Detritivory is the common freshwater fishes, especially in the Neotropical region, and for many species are scarce information about the digestory tract, as is the case of the species Steindachnerina notonota, in which, it has ecological importance as links in the food chain, serving of feed for carnivorous fishes, and acting in the depuration of aquatic ecosystems subject to organic pollution. The objective of present study consists of analyzing the morphological adaptations of the digestory tract, of this endemic species of the caatinga, Brazilian semiarid region. Thus, 10 adult specimens were used (males and females), necropsied for macroscopic and microscopic analysis of the digestory tract. All structures were observed in the stereomicroscope. The organs were fixed in 10% formalin and submitted to hematoxylin and eosin staining, and PAS - periodic acid Schiff (gill rakers, epibranchial organ, esophagus, stomach, midgut and hindgut) and analyzed by light microscopy. The gill rakers were also fixed in 10% paraformaldehyde for analysis by scanning electron microscopy. The specimens analyzed had total length between 6,4 to 13 cm, standard length between 4,8 to 10,3 cm, and weight of 3,23 to 35,92 g. The structural adaptations in the digestory tract were: mouth of the terminal type; the particular complex bucopharyngeal; absent from tooth and tongue; it has three types of formats of gill rakers with mucous cells and taste buds; possess the epibranchial organ with its peculiarities; a mechanical stomach with highly developed musculature in the pylorus; and a very long and coiled intestine, which internally has exclusive helical fold. The morphological aspects of digestory tract of S. notonota are related to detritivore-ilyophago specialized feeding habit.