Histopathological changes in the gills of Channa punctatus Bl. Infected with Henneguya waltairensis

Kalavati, C.; Narasimhamurti, C. C.

doi:10.1016/s0003-9365(85)80023-3

Cited by 25 publications

(14 citation statements)

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“…The inter and intralamellar presence of cysts, associated to hyperplasia and inflammation increased the adherence between secondary lamellae. This fact and the hyperplasia of the goblet cells associated with an increase in the mucus production caused respiratory distress syndrome and suffocation of fishes (Dyková & Lom, 1978;Current & Janovy, 1978;Shariff, 1982;Bowser & Conroy, 1985;Kalavati & Narasimhamurti, 1985;. The lesions were similar to those observed in H. psorospermica infections in perch, Perca fluviatilis (Dyková & Lom, 1978).…”

Section: Tablesupporting

confidence: 63%

Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host

et al. 1999

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The purpose of the study was to evaluate the susceptibility of 4 important cultivated fishes to sporozoan parasites. Fishes were collected bimonthly from a pond for a period of 1 year. Myxobolus colossomatis and Henneguya piaractus were found in the internal organs and gills, respectively. The combined incidence of parasitism by both myxozoa was 97.3% in pacu (Piaractus mesopotamicus), 33.3% in hybrid tambacu (Piaractus mesopotamicus x Colossoma macropomum), 5.6% in tambaqui (Colossoma macropomum) and 0% in carp (Cyprinus carpio). Pacu was the most susceptible fish and was parasitized 79.2% in the gills, 66.7% in the kidney and 50% in the spleen. Histopathological evaluation of the gills showed hemorrhages, inflammatory reaction with mononuclear cells and fibroblasts and hyperplasia of basal and goblet cells.Key words: Myxozoa, susceptibility, histopathology, cultivated fish. RESUMO

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Section: Tablesupporting

confidence: 63%

Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host

et al. 1999

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“…The inter and intralamellar presence of cysts, associated to hyperplasia and inflammation increased the adherence between secondary lamellae. This fact and the hyperplasia of the goblet cells associated with an increase in the mucus production caused respiratory distress syndrome and suffocation of fishes (Dyková & Lom, 1978;Current & Janovy, 1978;Shariff, 1982;Bowser & Conroy, 1985;Kalavati & Narasimhamurti, 1985;. The lesions were similar to those observed in Henneguya infections in perch, Perca fluviatilis (Dyková & Lom, 1978) and in P. mesopotamicus (Alexandrino et al, 1995;Ferraz de Lima et al, 1995).…”

Section: Discussionmentioning

confidence: 61%

Gill infection of Leporinus macrocephalus Garavello & Britski, 1988 (Osteichthyes: Anostomidae) by Henneguya leporinicola n. sp. (Myxozoa: Myxobolidae). Description, histopathology and treatment

et al. 1999

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Piauçus (Leporinus macrocephalus), were raised in 300 m² ponds (density of 10 fish/m²) presenting asphyxia signals and daily mortality of 27 fishes. Specimens with 8-cm total body length, were collected for necropsy. Mucus of body surface and pieces of organs were collected and examined microscopically, in wet mounts, stained or in histological sections. The smears examination showed the presence of several spores in the secondary lamellae of the gill filaments, identified as Henneguya leporinicola n.sp (Myxozoa: Myxobolidae). Histopatological study showed epithelial hyperplasia and fulfilling of the spaces between the secondary lamellae, congestion and teleangiectasia sinusoidal. It was also observed hyperplasia of the goblet cells and several cysts of parasite with 70.3mum diameter. Such cysts were situated among the secondary lamellae, covered or not by the hyperplasic epithelium. With this diagnostic, three applications of formalin solution 10 ml/m³ were carried out. Fifteen days after that, fish were examined again to ascertain whether the treatment was efficient on disease caused by the protozoa. The tissue alterations present in the gills after the treatment were just a moderate sinusoidal congestion and a slight epithelial hyperplasia on the base of the secondary lamellae.

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“…In those few works where the researchers describing the species precisely indicated the location of the developmental site, most of the known species belonged to the intralamellar type of the gill locations proposed by the present author. Regarding Henneguya species, such a (lamellar) location has been reported by McCraren et al (1975) for the Henneguya species studied by them, by Dyková & Lom (1978) for H. psorospermica, by Cone (1979) for H. doori, by Shariff (1982) for H. shaharini, by Kalavati & Narasimhamurti (1985) for H. waltairensis, by Haaparanta et al (1994) and Molnár (1998) for H. creplini, and by Casals et al (1997) for H. striolata. In addition to the findings published by Current & Janovy (1978), the paper written by Obiekezie & Enyenihi (1988) on H. chrysichthys contains data on the possible interlamellar location of Henneguya species.…”

Section: Discussionmentioning

confidence: 74%

Site preference of fish myxosporeans in the gill

2002

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In addition to the morphological and size characteristics of the spores, indicating the exact location and tissue specificity is also essential for differentiation of the large number of species belonging to the group of gill-parasitic fish, the myxosporeans. According to the observations of the present author, Myxobolus, Henneguya and Thelohanellus species are characterised by strict tissue specificity, and species showing affinity to the epithelium, connective tissue, cartilage or vascular tissue usually occur in a strictly defined location within the gill apparatus. Some of the species typically form plasmodia in the lamellae of the gill and others in the gill filaments. Yet other species develop their plasmodia at the base of the gill filament or in the gill arch. Instead of the generally accepted but misleading terms 'intra-' and 'interlamellar', the present author distinguishes interlamellar-epithelial and intralamellar-vascular types in the case of plasmodia developing in the gill lamellae, and intrafilamental-epithelial, intrafilamental-vascular and intrafilamental-chondroidal types in the case of plasmodia developing in the gill filaments. Regarding site of development within the gill, the location of basifilamental plasmodia and that of plasmodia developing in the cartilaginous matrix, connective tissue or blood vessels of the gill arch are well distinguishable from the above types.

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Histopathological changes in the gills of Channa punctatus Bl. Infected with Henneguya waltairensis

Cited by 25 publications

References 1 publication

Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host

Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host

Gill infection of Leporinus macrocephalus Garavello & Britski, 1988 (Osteichthyes: Anostomidae) by Henneguya leporinicola n. sp. (Myxozoa: Myxobolidae). Description, histopathology and treatment

Site preference of fish myxosporeans in the gill

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