Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf

Veterinary inspection of fish caught at the western side of the Arabian Gulf off the shore of Saudi Arabia in 2017 revealed abnormal irregular zigzag black lines in the skins of 135 out of 1500 (prevalence = 9 %) whitecheek sharks (Carcharhinus dussumieri). These lesions have been noticed in the dor...

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Autores principales:	Attia M. M., Ibrahim M. M., Mahmoud M. A., Al-Sabi M. N. S.
Formato:	article
Lenguaje:	EN
Publicado:	Sciendo 2021
Materias:	huffmanela egg morphology shark skin parasite prevalence Agriculture (General) S1-972 Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/fe32aee61d4f40cd97d1114dadef6674
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id	oai:doaj.org-article:fe32aee61d4f40cd97d1114dadef6674
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spelling	oai:doaj.org-article:fe32aee61d4f40cd97d1114dadef66742021-12-05T14:11:07ZHuffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf1336-908310.2478/helm-2021-0030https://doaj.org/article/fe32aee61d4f40cd97d1114dadef66742021-09-01T00:00:00Zhttps://doi.org/10.2478/helm-2021-0030https://doaj.org/toc/1336-9083Veterinary inspection of fish caught at the western side of the Arabian Gulf off the shore of Saudi Arabia in 2017 revealed abnormal irregular zigzag black lines in the skins of 135 out of 1500 (prevalence = 9 %) whitecheek sharks (Carcharhinus dussumieri). These lesions have been noticed in the dorsal and ventral part of the head near the snout and around the eyes, as well as in the skin of the pectoral fins. The parasitological, pathological and ultramorphological aspects of the sampled fish were studied using a light microscope, as well as scanning and transmission electron microscopes. Trichosomoidid-type eggs identified as Huffmanela sp. were found in the superficial layer of the skin. The mature eggs containing larvae (n = 75) were ellipsoidal or spindle-shaped, smooth-shelled, amber-brown to dark brown or even black in colour. The width of the eggs ranged from 34 to 49μm with lengths ranging from 95 to 107μm. The polar plugs of the immature eggs were slightly protruding, whereas mature eggs had clearly protruding polar plugs. The width of the polar plugs ranged from 4.5 – 9.5μm. The shells of the eggs were smooth and there was a thin layer seen near the polar areas. The infected skin exhibited desquamated epithelium, with inflammatory cell aggregations and melanophores in the debris. The underlying musculatures of the skin were free from any eggs, but showed mild pathological changes, including congestion of blood vessels, haemorrhages and oedema. The prevalence of infection showed seasonality, peaking significantly in the spring (18.18 %), with comparable prevalence rates in winter and summer (9.43 % and 8.57 %, respectively). However, infections dropped significantly during the autumn months (3.75 %). It is believed that this is the first study reporting the presence of Huffmanela sp. in whitecheek sharks at El-Jubail Province, Saudi Arabia, Arabian Gulf.Attia M. M.Ibrahim M. M.Mahmoud M. A.Al-Sabi M. N. S.Sciendoarticlehuffmanelaegg morphologysharkskin parasiteprevalenceAgriculture (General)S1-972Medicine (General)R5-920ENHelminthologia, Vol 58, Iss 3, Pp 281-291 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	huffmanela egg morphology shark skin parasite prevalence Agriculture (General) S1-972 Medicine (General) R5-920
spellingShingle	huffmanela egg morphology shark skin parasite prevalence Agriculture (General) S1-972 Medicine (General) R5-920 Attia M. M. Ibrahim M. M. Mahmoud M. A. Al-Sabi M. N. S. Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf
description	Veterinary inspection of fish caught at the western side of the Arabian Gulf off the shore of Saudi Arabia in 2017 revealed abnormal irregular zigzag black lines in the skins of 135 out of 1500 (prevalence = 9 %) whitecheek sharks (Carcharhinus dussumieri). These lesions have been noticed in the dorsal and ventral part of the head near the snout and around the eyes, as well as in the skin of the pectoral fins. The parasitological, pathological and ultramorphological aspects of the sampled fish were studied using a light microscope, as well as scanning and transmission electron microscopes. Trichosomoidid-type eggs identified as Huffmanela sp. were found in the superficial layer of the skin. The mature eggs containing larvae (n = 75) were ellipsoidal or spindle-shaped, smooth-shelled, amber-brown to dark brown or even black in colour. The width of the eggs ranged from 34 to 49μm with lengths ranging from 95 to 107μm. The polar plugs of the immature eggs were slightly protruding, whereas mature eggs had clearly protruding polar plugs. The width of the polar plugs ranged from 4.5 – 9.5μm. The shells of the eggs were smooth and there was a thin layer seen near the polar areas. The infected skin exhibited desquamated epithelium, with inflammatory cell aggregations and melanophores in the debris. The underlying musculatures of the skin were free from any eggs, but showed mild pathological changes, including congestion of blood vessels, haemorrhages and oedema. The prevalence of infection showed seasonality, peaking significantly in the spring (18.18 %), with comparable prevalence rates in winter and summer (9.43 % and 8.57 %, respectively). However, infections dropped significantly during the autumn months (3.75 %). It is believed that this is the first study reporting the presence of Huffmanela sp. in whitecheek sharks at El-Jubail Province, Saudi Arabia, Arabian Gulf.
format	article
author	Attia M. M. Ibrahim M. M. Mahmoud M. A. Al-Sabi M. N. S.
author_facet	Attia M. M. Ibrahim M. M. Mahmoud M. A. Al-Sabi M. N. S.
author_sort	Attia M. M.
title	Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf
title_short	Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf
title_full	Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf
title_fullStr	Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf
title_full_unstemmed	Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf
title_sort	huffmanela sp. (nematoda: trichosomoididae: huffmanelinae) encountered in the whitecheek shark (carcharhinus dussumieri) in the arabian gulf
publisher	Sciendo
publishDate	2021
url	https://doaj.org/article/fe32aee61d4f40cd97d1114dadef6674
work_keys_str_mv	AT attiamm huffmanelaspnematodatrichosomoididaehuffmanelinaeencounteredinthewhitecheeksharkcarcharhinusdussumieriinthearabiangulf AT ibrahimmm huffmanelaspnematodatrichosomoididaehuffmanelinaeencounteredinthewhitecheeksharkcarcharhinusdussumieriinthearabiangulf AT mahmoudma huffmanelaspnematodatrichosomoididaehuffmanelinaeencounteredinthewhitecheeksharkcarcharhinusdussumieriinthearabiangulf AT alsabimns huffmanelaspnematodatrichosomoididaehuffmanelinaeencounteredinthewhitecheeksharkcarcharhinusdussumieriinthearabiangulf
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Huffmanela sp. (Nematoda: Trichosomoididae: Huffmanelinae) encountered in the whitecheek shark (Carcharhinus dussumieri) in the Arabian Gulf

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