Inter-Research > DAO > v84 > n3 > p251-255  
Diseases of Aquatic Organisms

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DAO 84:251-255 (2009)  -  DOI:

Huffmanela sp. (Nematoda: Trichosomoididae) muscular parasite from Trisopterus luscus captured off the Portuguese coast

Alexandra Esteves1,*, Fernanda Seixas1, Susana Carvalho2, Nuno Nazário3, Miguel Mendes3, Conceição Martins1

1Centre of Studies in Animal and Veterinary Science (CECAV), University of Trás-os Montes e Alto Douro (UTAD), Apartado 1013, 5001-801, Vila Real, Portugal
2Veterinary Medicine, University of Trás-os Montes e Alto Douro (UTAD), 5001-801, Vila Real, Portugal
3Direcção Geral de Veterinária, Ministério da Agricultura, do Desenvolvimento Rural e Pescas, Largo da Academia Nacional das Belas artes, no. 2, 1249-105, Lisbon, Portugal

ABSTRACT: Four samples of Trisopterus luscus exhibiting unusual black spots on their musculature were obtained from catches made on different days and were rejected as unsuitable for consumption. Bipolar eggs somewhat resembling those of the nematode genus Huffmanela (Nematoda: Trichosomoididae) were identified as the cause of these black spots. Microscopic analysis revealed the presence of dark-shelled trichinelloid embryonated eggs dispersed throughout the muscle tissue, 73 to 94 × 40 to 59 µm in size, with large polar plugs 14 to 22 µm wide. However, the morphology and distribution of the observed eggs were not compatible with any previously described Huffmanela species. Intracellular nematodes were also observed in muscle cells. In 2 samples, sectioned nematode specimens were observed in other locations as well: the lymphatic vessel of intestine submucosa and the dermal lymphatic vessel. This could be due to nematode migration inside the infected fish. The presumed identification of Huffmanela sp. in a new host (Trisopterus luscus), and in a new location (Atlantic Ocean) supports the belief that these parasites could be widely distributed, particularly in marine fishes. In view of these factors, together with the observed egg morphology, it is possible that these specimens represent a new, unidentified Huffmanela species.

KEY WORDS: Huffmanela · Trisopterus luscus · Portuguese coast · Black spots · Nematode

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Cite this article as: Esteves A, Seixas F, Carvalho S, Nazário N, Mendes M, Martins C (2009) Huffmanela sp. (Nematoda: Trichosomoididae) muscular parasite from Trisopterus luscus captured off the Portuguese coast. Dis Aquat Org 84:251-255.

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