VARIATION IN RESPONSE OF CHANNEL CATFISH TO Henneguya SP. INFECTIONS (PROTOZOA: MYXOSPORIDEA)

McCraren, J.P.; Landolt, Marsha L.; Hoffman, G. L.; Meyer, Fred P.

doi:10.7589/0090-3558-11.1.2

Cited by 60 publications

(47 citation statements)

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“…These terms differ in their mean- ing from those proposed by the present author, as Current & Janovy (1978) failed to distinguish between infections extending to the gill filament and those restricted to the gill lamellae. Although in the case of infection designated by them as intralamellar, Current & Janovy (1978) indicate that plasmodium development starts at a site adjacent to the sinuses and capillaries of the gill lamellae, they do not agree with the observations made by McCraren et al (1975) on the same parasite species, i.e. that infection starts from the capillaries of the gill lamellae.…”

Section: Discussioncontrasting

confidence: 47%

“…Therefore, the form designated by them as intralamellar corresponds to the location indicated as interlamellar by the present author. In the opinion of the present author, the photographs presented by McCraren et al (1975) clearly show the intralamellar (intracapillary) location, and outgrowth of the plasmodium from the side of the gill lamellae into the interlamellar epithelium corresponds precisely to the type of development shown in this paper as 'intralamellar asymmetric type' in the example of the species Myxobolus bramae. The 'interlamellar' designation suggested by Current & Janovy (1978) is even more confusing in a case where the authors obviously described a form of development within the gill filament (intrafilamental development).…”

Section: Discussionmentioning

confidence: 95%

“…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: 96%

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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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Section: Discussioncontrasting

confidence: 47%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 96%

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Site preference of fish myxosporeans in the gill

2002

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“…The present infection caused hyperplasia of the interlamellar epithelia1 cells and atrophy of the respiratory lamellae at the cyst site. McCraren et al (1975) classified the branchial forms of Henneguya infection into interlamellar and intralamellar. They defined intralamellar forms as developing within capillaries of gill lamellae or blood vessels of the gill filaments.…”

Section: Comment On the Validity Of Somementioning

confidence: 99%

Henneguya ghaffari sp. n. (Myxozoa:Myxosporea), infecting the Nile perch Lates niloticus (Teleostei:Centropomidae)

Ali¹

1999

Dis. Aquat. Org.

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Light microscopical description is presented for a new myxozoan species, Henneguya ghaffari, which infects the Nile perch Lates niloticus (Linnaeus, 1758) in Lake Wadi El-Raiyan in Egypt. The spore is characterized by a triangular thickening at the base of the caudal processes. The relatively long caudal processes run adherent to each other for two-thirds of their length, then bifurcate to very fine processes. Prevalence of infection was 34.6'% and peaked during winter and early spring. The infection was concentrated along the intestinal tract, and in severe cases gills and gill rakers were also infected. Histology revealed that, in contrast to findings of previously published works on related species, intralamellar plasmodia did not develop inside the blood capillaries of the gills. Intestinal plasmodia were very pathogenic due to their large number and size. These plasmodia caused atrophy of the muscularis Idyclr, and replaced and distended the submucosal and mucosal layers. The validity of some Henneguya specles in Afr~ca is discussed.

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“…The utilization of different microhabi tats in the hosts gills by a single myxosporean species have been reported by several researchers. For ex ample, McCraren et al (1975) described two types of branchial infection with Henneguya sp. in channel cat fish; an 'interlamellar' form which caused significant losses among small fish and an 'intralamellar' form which was less pathogenic among small fish.…”

Section: Discussionmentioning

confidence: 99%

Myxobolus koi(Myxozoa: Myxosporea) Forms Large- and Small-Type 'Cysts' in the Gills of Common Carp.

et al. 1997

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Co-occurrence of two types of Myxobolus 'cysts' was recognized in the gills of cultured common carp (Cyprinus carpio) juvenile; one was a highly harmful large 'cyst' type and the other was a harmless small 'cyst' type. At a farm investigated, prevalences of large and small-type `cysts' reached a maximum of 25 % in July and 100% in August 1995, respectively. Invasion of the myxosporean forming large `cysts' was presumed to start before mid-June, whereas that of the small-type started after mid-June. Large-type plasmodia developed along with the primary lamellae and finally formed large irregular-shaped 'cysts', reaching several mm in size. On the other hand, small-type plasmodia grew in the secondary lamellae and the 'cyst' was confined to a single lamella. Morphological and serological comparisons of the Myxobolus spores from the two 'cyst' types indicated that both types represented Myxobolus koi Kudo, 1920.

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VARIATION IN RESPONSE OF CHANNEL CATFISH TO Henneguya SP. INFECTIONS (PROTOZOA: MYXOSPORIDEA)

Cited by 60 publications

References 0 publications

Site preference of fish myxosporeans in the gill

Site preference of fish myxosporeans in the gill

Henneguya ghaffari sp. n. (Myxozoa:Myxosporea), infecting the Nile perch Lates niloticus (Teleostei:Centropomidae)

Myxobolus koi(Myxozoa: Myxosporea) Forms Large- and Small-Type 'Cysts' in the Gills of Common Carp.

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