Histochemical demonstration of esterase in certain freshwater larval trematodes with a note on neuroanatomy

Choubisa, S. L.

doi:10.1007/bf03179427

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…The secretory granules pass to the apical region of the secretory cells from where they are discharged into the lumen. Alternatively secretory cells undergo lysis due to the presence of the digenean larvae, liberating secretory granules which then find their way into the lumen (Choubisa 1986). The increase of NSE in the infected host tissue, therefore, may be related to the presence of larval forms.…”

Section: Discussionmentioning

confidence: 99%

Histological and histochemical observations on the digestive gland ofMelanoides tuberculatus (Gastropoda) infected with certain larval trematodes and focus on their mode of nutrition

Choubisa

1988

Proc. Indian Acad. Sci. (Anim. Sci.)

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Histological and histochemical observations were made on infected and uninfected digestive glands of snails, Melanoides tuberculatus. Infected gland either with sporocysts of Cercaria diqlandulata (Xiphidio) or with rediae of Cercaria martini (Monostome) revealed basically two types of histopathological abnormalities (damages), mechanical (lesion 1) and physiological (lesion 2). Depletion of carbohydrates, lipids and proteins as well as increased activities of phosphatases, lipase, non-specific esterase and glucose-6-phosphatase were also reflected by infected digestive gland. Alterations either histological or histochemical in infected glands are associated with the type and size of trematode larvae and degree of parasitemea and these were greater in glands infected with rediae than in sporocysts, Besides pathogenesis, the present study also focusses on the mode of nutrition in certain trematode larvae.

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Section: Discussionmentioning

confidence: 99%

Histological and histochemical observations on the digestive gland ofMelanoides tuberculatus (Gastropoda) infected with certain larval trematodes and focus on their mode of nutrition

Choubisa

1988

Proc. Indian Acad. Sci. (Anim. Sci.)

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“…are also progressive and well developed at the cercarial and metacercarial stages. These organ systems in sporocysts, rediae, cercarae, metacercarae and juvenile trematodes are well studied in both in-vivo and in-vitro by several workers [33][34][35][36][37][38][39]. However, the digestive and reproductive systems are almost in non-functional.…”

Section: Larval Trematodes and Their Biology In Briefmentioning

confidence: 99%

A Brief Review of Parasitic Castration in Aquatic Snails and Its Contribution in Control of Diverse Vector Snail Populations and Trematodiases in Man and Animals

SL¹

2022

AustinJInfectDis

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Snails are invertebrate gastropod molluscs inhabited both the terrestrial and aquatic habitats. Most of these animals are dioeciously and their sexes are separated. In many monoecious (hermaphrodite) snail species, individuals have both male and female gonads. But in pulmonate monoecious snail species individuals have only single gonad called “ovotestis” which contains both testicular and ovarian tissues. In general, aquatic snail species are intermediate hosts of digenean trematode parasites of vertebrates including man and animals. In addition, aquatic snails are also act as vector of diverse trematodiases, such as schistosomiasis, clonorchiasis, opisthorchiasis, fascioliasis, amphistomiasis, etc. The prevalence of these digenetic trematode parasitic diseases in diverse geographical provinces is depending on the population of vector or intermediate host snail species. In fact, the various larval stages of digenean trematode parasites, such as sporocysts, rediae and cercariae are developed and multiplied asexually in the organ of hepatopancreas and/or gonads of host snails. These parasitic trematode larvae also act as castrators for snails and potential to prevent or block partially or completely their reproduction called “parasitic castration”. In this biological process, trematode larvae destroy the gonads in two ways, one is mechanically and the other physiologically. Parasitic castration is also induces sex conversion, gigantism and alteration the gene expression in brain of snails. In present communication, the most common vector snail species, different forms of trematode larvae and their basic biology and mode of parasitic castration in aquatic snails and its contribution in control of diverse vector snail populations and spreading of trematodiases are considered and brief and critically reviewed. Simultaneously, research gaps have also been highlighted for further advance research work. This review is helpful in understanding of biology or mechanism of parasitic castration and its contributory role the balancing of aquatic ecosystem.

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“…But studies on larval trematode parasites of freshwater snails are still too scanty (Choubisa 2008a). However, few excellent studies on nutrition and digestion (Sharma and Choubisa 1985;Choubisa 1988aChoubisa , 2008b, neuroanatomy (Choubisa and Sharma 1983b;Choubisa 1986Choubisa , 1988bChoubisa , 1989, histopathogenesis (Choubisa1990a, 1998Choubisa et al 2012), parasitic castration (Choubisa and Sheikh 2013d), behaviors and seasonal infection (Choubisa 1991b(Choubisa , 1997(Choubisa , 2002Choubisa and Sharma 1986) of diverse trematode larvae as well as on their in vitro culture (Choubisa 1988c) have been conducted earlier. Besides the new records of larval digeneans, few new species of cercariae have also been reported from Rajasthan (Sharma and Choubisa 1983;Choubisa 1985Choubisa , 1990bChoubisa , 1992bChoubisa and Sharma 1985).…”

Section: Introductionmentioning

confidence: 99%

First record of a rare transversotrematid cercaria larva (Trematoda: Digenea) from Rajasthan, India: focus on seasonal occurrence and host-specificity of diverse cercariae

Choubisa¹,

Jaroli²,

Sheikh³

2016

J Parasit Dis

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During the survey of freshwater snail hosts and their digenean larval trematode parasites, a rare cercaria larva belonging to family Transversotrematidae and subclass Digenea (Trematoda) was recovered from the snail species inhabiting perennial Som river of Udaipur district, Rajasthan, India. More than 28 % mature specimens of these snails were found to be infected with transversotrematid cercaria larvae in the spring season. Body of this cercaria is large, bowl-shaped, biocellate, spinose, transparent and laterally extended having two pigmented eye spots, two hold fast organs extended from the junction of body and tail, large tail with two foliated furcal rami, and cyclocoel intestinal caeca. As far as the authors are aware, this is the first record of a transversotrematid larva from Rajasthan, India. Simultaneously, other forms of cercariae viz., amphistome, echinostome, monostome, gymnocephalous, furcocercous and xiphidiocercous cercariae were also recovered from fifteen species of pulmonate and operculate snails including f., . f. ,. f., . f. ,. f., . f. . f. , () , and () ,, () , () ,, race and . race . The seasonal occurrence and host-specificity of diverse trematode cercaria larvae are also discussed besides the first record of a rare transversotrematid cercaria larva from Rajasthan, India.

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Histochemical demonstration of esterase in certain freshwater larval trematodes with a note on neuroanatomy

Cited by 5 publications

References 12 publications

Histological and histochemical observations on the digestive gland ofMelanoides tuberculatus (Gastropoda) infected with certain larval trematodes and focus on their mode of nutrition

Histological and histochemical observations on the digestive gland ofMelanoides tuberculatus (Gastropoda) infected with certain larval trematodes and focus on their mode of nutrition

A Brief Review of Parasitic Castration in Aquatic Snails and Its Contribution in Control of Diverse Vector Snail Populations and Trematodiases in Man and Animals

First record of a rare transversotrematid cercaria larva (Trematoda: Digenea) from Rajasthan, India: focus on seasonal occurrence and host-specificity of diverse cercariae

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