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Previous issue date: 2009-04-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Food habits and morpho-histology of the digestive tract of marbled swamp eel,
Synbranchus marmoratus (Block, 1917) were investigated. The fish samples were
captured during August, 2007 to July, 2008 in the Marechal Dutra reservoir, Acari, Rio
Grande do Norte. The rain fall data was obtained from EMPARN. The fish captured,
were measured, weighed, dissected, eviscerated and individual stomach weights were
registered. The stomach contents analyses were carried out based on volumetric method,
points, frequency of occurrence and applying the Index of Relative Importance. The
degrees of repletion of the stomachs were determined besides the Index of Repletion
relating to feeding activity variations and frequency of ingestion during the rainy and
dry seasons. The rainfall varied from 0 mm a 335 mm with a mean value of 71.62 mm.
Highest rainfall of 335.5 mm was registered in March, 2008 and August to December
was the dry period. During the dry period the study species presented high degrees of
repletion of the stomachs, with a peak value in the month of September (mean = 4.54; ?
SD = 0.56). The minimum mean value of = 3.99 ? SD = 0.25 was registered in the
month of May during the rainy period. The stomach contents of S. marmoratus
registered show that this fish prefers animals, 78.22% of crustaceans 2.85% of
mollusks, 3.25% of fish, 1.4% of insects and 13.5% of semi-digested organic matter,
thus characterizing the study species as a carnivore with a preference for crustaceans.
The morpho-histological aspects of the digestive tract of S. marmoratus indicate that the
mouth is terminal adapted to open widely, thin lips with taste buds, small villiform teeth
forming a single series on maxillas, four pairs of branchial arches with short and widely
spaced branchial rays. The oesophagus is short and cylindrical with a small diameter.
The oesophagus wall is thick with mucas surface and internal parallel folds. The
stomach is retilinical in form, presenting cardiac, caecal and pyloric portions. The
caecal portion is long and is intermediary in position between the cardiac and pyloric
portions. The cardiac portion of the stomach is short and cylindrical formed of simple
epithelial cylindrical mucus cells. The caecal portion is long with narrow walls, a big
cavity and smaller folds which give rise to gastric glands. The phyloric portion has no
glands and primary or secondary mucas folds. The morphohistological aspects of the
digestive tract of S. marmoratus indicate its adaptation to a carnivorous feeding habit / O regime alimentar e a morfohistologia do tubo digest?rio do mussum, Synbranchus
marmoratus (Block, 1917) foram investigados. Os exemplares foram capturados
mensalmente no per?odo de agosto de 2007 a julho de 2008, no a?ude Marechal Dutra,
Acari, Rio Grande do Norte. Foram verificados os par?metros limnol?gicos, tais como,
temperatura da ?gua, oxig?nio dissolvido e condutividade el?trica do a?ude. Os valores
mensais de pluviosidade foram obtidos da EMPARN. Os peixes capturados foram
medidos, pesados, eviscerados e registrado o peso de cada est?mago. A an?lise do
conte?do estomacal foi realizada de acordo com o m?todo de pontos e m?todo de
freq??ncia de ocorr?ncia associado ao m?todo de import?ncia alimentar. Os est?magos
tiveram o grau de reple??o determinado e o ?ndice de reple??o relacionando a atividade
alimentar com o per?odo chuvoso e de estiagem. A precipita??o pluviom?trica variou de
0 a 335 mm. A m?dia anual da pluviosidade foi de 71,62 mm ? SD 163,3. O maior valor
de 335,5 mm ocorreu em mar?o de 2008 e os menores valore ocorreram nos meses de
agosto a dezembro de 2007. No per?odo de seca, S. marmoratus apresentou valores
mais altos no ?ndice m?dio de Reple??o, com um pico no m?s de setembro (4,54; ? SD
= 0,56), sendo esse o maior valor m?dio de IR anual. O menor valor (3,99; ? SD = 0,25)
ocorreu no m?s de maio no per?odo chuvoso. Os resultados obtidos indicam que S.
marmoratus alimentou-se preferencialmente de material animal, sendo 78,22% de
crust?ceos, 13,5% de material org?nico semi digerido, 3,25% de moluscos, 2,85% de
peixes e 1,4% de insetos. Portanto, a esp?cie em estudo pode ser caracterizada como
carn?voro com prefer?ncia a carcinofagia. Os aspectos morfohistol?gicos do tubo
digest?rio do S. marmoratus foram investigados e os resultados indicam que boca ?
terminal com grande abertura, l?bios delgados com corp?sculos gustativos, os dentes
s?o pequenos villiformes formando uma ?nica s?rie nas maxilas, com quatro pares de
arcos branquiais com rastros branquiais curtos e espassados. O es?fago ? curto e
apresenta formato cil?ndrico com pequeno di?metro. A parede esof?gica ? espessa com
a superf?cie interna formada por mucosa, contendo pregas paralelas. O est?mago ? do
tipo retil?neo, formado pelas por??es c?rdica, cecal e pil?rica. A regi?o de maior
comprimento ? a regi?o cecal, localizada entre a por??o c?rdica e pil?rica. A regi?o
c?rdica que ? a primeira por??o do est?mago ? curta e cil?ndrica, formada por mucosa
constitu?da por epit?lio cil?ndrico simples, com muitas c?lulas caliciformes. A regi?o
cecal ? alongada e apresenta paredes delgadas, luz maior que a c?rdica, com pregas de
menor porte, formado por epit?lio cil?ndrico simples com gl?ndulas g?stricas. A por??o
pil?rica n?o possui gl?ndulas e apresenta pregas principais e secund?rias em sua
mucosa. Os aspectos morfohistol?gicos do trato digest?rio do S. marmoratus mostram
que a esp?cie ? adaptada para h?bito alimentar carn?voro
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/13060 |
| Date | 30 April 2009 |
| Creators | Montenegro, Luciana Ara?jo |
| Contributors | CPF:15644812472, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787789Y9, Chellappa, Naithirithi Tiruvenkatachary, CPF:20016581415, http://lattes.cnpq.br/1365437036105422, Passavante, Jos? Zanon de Oliveira, CPF:00614874491, http://lattes.cnpq.br/7147339394595199, Canan, Bhaskara, CPF:15574172453, http://lattes.cnpq.br/6110001233943643, Chellappa, Sathyabama |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncias Biol?gicas, UFRN, BR, Biodiversidade; Biologia Estrutural e Funcional. |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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