Banca de DEFESA: LENILDA TEIXEIRA DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LENILDA TEIXEIRA DA SILVA
DATA : 21/06/2016
HORA: 14:00
LOCAL: Auditório do Departamento de Morfologia
TÍTULO:

Morphological adaptations of the digestory tract of neotropical fish Steindachnerina notonota (Characiformes, Curimatidae) to the detritivore feeding habit

PALAVRAS-CHAVES:

Morphology. Digestory tract. Detritivory. Ilyophago fish. Steindachnerina notonota.

PÁGINAS: 120
GRANDE ÁREA: Ciências Biológicas
ÁREA: Morfologia
SUBÁREA: Histologia
RESUMO:

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 of 8,66 ± 3,38 cm, standard length of 6,74 ± 1,95 cm, and weight 11,72 ± 11,59 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.

 

 

MEMBROS DA BANCA:
Externo à Instituição - DEYSE DE SOUZA DANTAS - UNIFAP
Externo ao Programa - 1217155 - GUSTAVO DA CUNHA LIMA FREIRE
Presidente - 2477216 - NAISANDRA BEZERRA DA SILVA FARIAS