Contribuição para o conhecimento de nematodes Huffmanela spp. como causa de rejeição em lota da faneca (Trisopterus luscus)
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2014-07-02
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Os nematodes do género Huffmanela são parasitas histozoicos que infetam
sobretudo os músculos das regiões abdominais e dorsais da faneca, Trisopterus luscus.
Os peixes são rejeitados em lota devido à alteração da cor da pele que apresenta
manchas escuras devido à presença de ovos castanhos embrionados. As variações de
cor observadas nos músculos destes peixes sugerem que a infeção é feita através do
tubo digestivo, inicialmente para a musculatura envolvente da cavidade abdominal.
Através do exame histopatológico, observaram-se ovos bioperculados, com superfície
lisa, imaturos (hialinos), com tamanho médio de 41,4x32,2 μm, e ovos embrionados
(castanhos), com tamanho médio de 68x38,2 μm, com localização intracelular ou, na sua
maioria, extracelular. Observaram-se porções de larvas ou parasitas adultos com a
mesma localização. Os ovos encontravam-se dispostos linearmente ou aleatoriamente
sugerindo movimentos migratórios de uma ou mais fêmeas. Os ovos em fila encontravamse
unidos por um tecido unitivo observado em microscopia eletrónica de varrimento
(MEV).
The nematodes of the genus Huffmanela are a histozoics parasites which mainly infects the muscles of the abdominal and dorsal regions of the pouting, Trisopterus luscus. Fish are rejected at initial auction because of an alteration in skin colour which presents dark markings due to the presence of embryonated brown eggs. The variations of colour observed in the muscles of these fish suggest that infection is affected through the digestive tube, initially to the surrounding muscular structures of the abdominal cavity. The histopathological examination, revealed bioperculated eggs which presented a smooth surface, were immature (hyaline), averaging 41,4x32,2 μm in size, and embryonated eggs, (brown), 68x38,2 μm on average, and were in either intracellular or, for the greater part, extracellular locations. Portions of larvae or adult parasites were observed in the same locations. The eggs were in lines or in random positions suggesting migratory movements of one or more females. The eggs in lines were bound together by unitive tissue observed with a scanning electron microscope (SEM).
The nematodes of the genus Huffmanela are a histozoics parasites which mainly infects the muscles of the abdominal and dorsal regions of the pouting, Trisopterus luscus. Fish are rejected at initial auction because of an alteration in skin colour which presents dark markings due to the presence of embryonated brown eggs. The variations of colour observed in the muscles of these fish suggest that infection is affected through the digestive tube, initially to the surrounding muscular structures of the abdominal cavity. The histopathological examination, revealed bioperculated eggs which presented a smooth surface, were immature (hyaline), averaging 41,4x32,2 μm in size, and embryonated eggs, (brown), 68x38,2 μm on average, and were in either intracellular or, for the greater part, extracellular locations. Portions of larvae or adult parasites were observed in the same locations. The eggs were in lines or in random positions suggesting migratory movements of one or more females. The eggs in lines were bound together by unitive tissue observed with a scanning electron microscope (SEM).
Descrição
Dissertação de Mestrado Integrado em Medicina Veterinária, Ciências Veterinárias
Palavras-chave
Nematoda , Parasita (huffmanela) , Trisopterus , Exames histopalógicos , Tecido unitivo