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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Biologia alimentar e morfohistologia do tubo digest?rio do mussum, synbranchus marmoratus, bloch (osteichthyes: synbranchidae) no a?ude Marechal Dutra Gargalheiras , localizado no semi-?rido brasileiro

Montenegro, Luciana Ara?jo 30 April 2009 (has links)
Made available in DSpace on 2014-12-17T14:10:21Z (GMT). No. of bitstreams: 1 LucianaAM_DISSERT.pdf: 3226407 bytes, checksum: fcd2ad69a51b02cfc80ffef9c9eb0d35 (MD5) 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
2

Estrat?gia reprodutiva do peixe hermafrodita mussum, Synbranchus marmoratus Osteichthyes, Synbranchidae em um a?ude do Rio Grande do Norte, Brasil

Barros, Nirlei Hirachy Costa 27 March 2012 (has links)
Made available in DSpace on 2014-12-17T14:10:29Z (GMT). No. of bitstreams: 1 NirleiHCB_DISSERT.pdf: 6542994 bytes, checksum: b970fd5055cebafb782b426aa47838fa (MD5) Previous issue date: 2012-03-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Reproductive strategy of the hermaphrodite fish the marbled swamp eel, Synbranchus marmoratus (Bloch, 1795) (Osteichthyes: Synbranchidae) was investigated in the Marechal Dutra reservoir, Acari, Rio Grande do Norte, using fish samples captured monthly during the period of July 2010 to July 2011. The limnological parameters and rainfall were verified. The captured fish specimens were numbered, weighed, measured, dissected and their gonads and liver were removed, weighed and identified as to sex and developmental stages of gonads. The length-weight relationship was determined for grouped sex. The size of first gonadal maturation, gonadosomatic index (GSI), condition factor (K) and hepatosomatic index (HSI) were calculated. The development stages of the gonads were investigated using macroscopic and histological techniques, besides the fecundity and reproductive period. The macroscopic characteristics and the histological development of gonads confirmed the four different sexual types in the sampled population: primary males, females, intersex and secondary males. The secondary males were bigger and heavier than all the other types. This species showed a negative allometric growth with a higher increase in length than weight. The size at which 50% of the females began the process of gonadal maturation was 43.5 cm of total length, and for secondary males it was 58.5 cm. Condition factor showed two peaks in February and in April 2011. IGS indicated a reproductive period from July to September 2010 and was negatively correlated with the condition factor and rainfall. IGS showed a negative correlation when compared with the condition factor and the rainy season. HSI was highest in February ad lowest in December. The reproductive period of this species occurs between the end of the rainy season and the beginning of the dry season. S. marmoratus presents a seasonal reproductive strategy which optimizes its reproductive success under the semiarid climatic conditions / A estrat?gia reprodutiva do peixe hermafrodita mussum, Synbranchus marmoratus (Bloch, 1795) (Osteichthyes: Synbranchidae) foi investigada no a?ude Marechal Dutra, Acari, Rio Grande do Norte, utilizando os exemplares capturados mensalmente no per?odo de julho de 2010 a julho de 2011. Foram verificados os par?metros limnol?gicos e a pluviosidade. Os exemplares capturados foram numerados, pesados, medidos, dissecados e o f?gado e as g?nadas foram retiradas, pesadas e identificadas quanto ao sexo e o est?dio de desenvolvimento gonadal. A rela??o peso-comprimento foi determinada para sexos agrupados. O tamanho da primeira matura??o, o ?ndice gonadossom?tico (IGS), o fator de condi??o (K) e o ?ndice hepatossom?tico (IHS) foram determinados. As fases do desenvolvimento das g?nadas foram investigadas usando t?cnicas macrosc?picas e histol?gicas, al?m de determinar a fecundidade e o per?odo reprodutivo da esp?cie. As caracter?sticas macrosc?picas e histol?gicas de desenvolvimento gonadal confirmaram os quatro tipos sexuais diferentes na popula??o dos peixes capturados, sendo: machos prim?rios, f?meas, intersexos e machos secund?rios. Os machos secund?rios apresentaram os maiores valores de comprimento total e peso total. A esp?cie mostrou um crescimento do tipo alom?trico negativo com maior incremento em comprimento do que em peso. O tamanho em que 50% da popula??o das f?meas iniciaram o processo de matura??o gonadal foi de 43,5 cm de comprimento total e para os machos secund?rios foi de 58,5 cm. O fator de condi??o apresentou dois picos, um no m?s de fevereiro e outro m?s de abril de 2011. IGS indicou um per?odo de reprodu??o durante julho a setembro de 2010, mostrando correla??o negativa ao fator de condi??o. IHS mostrou um pico no m?s de fevereiro com o menor valor no m?s de dezembro coincidindo com o per?odo de seca da regi?o. A esp?cie apresenta um per?odo reprodutivo entre o final das chuvas e o in?cio da seca. S. marmoratus mostra uma estrat?gia reprodutiva sazonal que aperfei?oa seu sucesso reprodutivo dentro das condi??es clim?ticas do semi?rido. Palavras chave: mussum, Synbranchus marmoratus, estrat?gia reprodutiva, hermafroditismo, a?ude do semi?rido

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