Parasitism of the isopod <i>Riggia puyensis</i> Rodríguez-Haro et al. in two armored catfish from Pastaza Province (Ecuador)

Abstract:Riggia puyensis, an ectoparasitic isopod, was collected in juvenile Chaetostoma breve and Chaetostoma microps host specimens from the Amazonian region of Ecuador. The aim of this work is to study the possible injury that the parasite causes in its host. R. puyensis was found covered by a fold of the skin, which formed a sort of pocket or pouch within the host’s peritoneal cavity. The alterations described in the epidermis were associated with the mechanical action of the isopod inside the pouch.

Key words
Armored catfish; Cymothoidae; isopod; Riggia puyensis

Authorship

SILVIA E. PLAUL

Servicio de Ictiopatología y Acuicultura, Facultad de Ciencias Veterinarias (FCV), Av. 60 y 118, s/n, Universidad Nacional de La Plata/UNLP, B1900, La Plata, Buenos Aires, Argentina Servicio de Ictiopatología y Acuicultura, Facultad de Ciencias Veterinarias (FCV)ArgentinaLa Plata, Buenos Aires, ArgentinaServicio de Ictiopatología y Acuicultura, Facultad de Ciencias Veterinarias (FCV), Av. 60 y 118, s/n, Universidad Nacional de La Plata/UNLP, B1900, La Plata, Buenos Aires, Argentina

Laboratorio de Histología y Embriología Descriptiva, Experimental y Comparada (LHYEDEC), FCV Av. 60 y 118 s/n, UNLP, B1900, La Plata, Buenos Aires, Argentina Laboratorio de Histología y Embriología Descriptiva, Experimental y Comparada (LHYEDEC)ArgentinaLa Plata, Buenos Aires, ArgentinaLaboratorio de Histología y Embriología Descriptiva, Experimental y Comparada (LHYEDEC), FCV Av. 60 y 118 s/n, UNLP, B1900, La Plata, Buenos Aires, Argentina

http://orcid.org/0000-0001-7318-7863

CECILIA RODRÍGUEZ-HARO

Universidad Regional Amazónica IKIAM, Biotecnología, Cátedra de Parasitología, Parroquia Muyuna, Kilómetro 7 vía a Alto Tena, s/n, Tena, Napo, Ecuador Universidad Regional Amazónica IKIAMEcuadorTena, Napo, EcuadorUniversidad Regional Amazónica IKIAM, Biotecnología, Cátedra de Parasitología, Parroquia Muyuna, Kilómetro 7 vía a Alto Tena, s/n, Tena, Napo, Ecuador

SERGIO R. MARTORELLI

Centro de Estudios Parasitológicos y Vectores (CEPAVE), CCT-La Plata-CONICET-UNLP. Av. 122 s/n, B1900, La Plata, Buenos Aires, Argentina Centro de Estudios Parasitológicos y Vectores (CEPAVE)ArgentinaLa Plata, Buenos Aires, ArgentinaCentro de Estudios Parasitológicos y Vectores (CEPAVE), CCT-La Plata-CONICET-UNLP. Av. 122 s/n, B1900, La Plata, Buenos Aires, Argentina

CLAUDIO G. BARBEITO

Correspondence to: Silvia Elena Plaul E-mail: splaul@fcnym.unlp.edu.ar Orcid: http://orcid.org/0000-0001-7318-7863

AUTHOR CONTRIBUTIONS

S. E. Plaul: histopathology preparation, pathological analysis and writing. C. Rodríguez-Haro: field sampling methodology. S. R. Martorelli: taxonomic identification and supervision. C. G. Barbeito: pathological analysis and writing.

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (3)

Thumbnail

Figure 1
Map of the sampling sites (red points) for collection of “carachamas” (Chaetostoma breve and Chaetostoma microps) in Amazonian region of Ecuador, Puyo and Bobonaza rivers.

Thumbnail

Figure 2
-a. Specimen of Chaetostoma breve shows a pore (arrow) on the lateral flank. b. Obliteration of the pore, giving rise to a scar (arrow). c. The skin (arrow) that forms a sort of pocket or pouch in the abdominal cavity of the fish. Female of Riggia puyensis, dorsal view (star). d. Position of the crustacean in the abdominal cavity, with the pleotelson showing its caudal tip through the pore.

Thumbnail

Figure 3
-a. Cross section at pore level showing the pouch, formed by epidermis and dermis (curly brackets), and inside the parasitic isopod (star), the circles (b - e) show the friction sites of the parasite. Scale bar: 2 mm. b – e. Detail of the friction sites. b. Dorsal region of the isopod, at pereonites level, pouch epidermal tissue is absent (arrow) and a decrease in the number of melanophores is observed. c. End of the pereonite, atrophy of the pouch epidermis was observed (arrow). d. e. At pereopods level, an increase in the height of the pouch epithelium is observed and an intense cellular infiltration, mainly lymphocytes (arrows), a few eosinophilic granular cells (asterisk) and desquamation of the epidermal tissue (head arrow). Scale bar: 50 µm. D: dermis, DP: dermal plates, E: epidermis, Hy: hypodermis, M: musculature, Pe: pereonites, Pr: pereopods.

Figure 1 Map of the sampling sites (red points) for collection of “carachamas” (Chaetostoma breve and Chaetostoma microps) in Amazonian region of Ecuador, Puyo and Bobonaza rivers.

Figure 2 -a. Specimen of Chaetostoma breve shows a pore (arrow) on the lateral flank. b. Obliteration of the pore, giving rise to a scar (arrow). c. The skin (arrow) that forms a sort of pocket or pouch in the abdominal cavity of the fish. Female of Riggia puyensis, dorsal view (star). d. Position of the crustacean in the abdominal cavity, with the pleotelson showing its caudal tip through the pore.

Figure 3 -a. Cross section at pore level showing the pouch, formed by epidermis and dermis (curly brackets), and inside the parasitic isopod (star), the circles (b - e) show the friction sites of the parasite. Scale bar: 2 mm. b – e. Detail of the friction sites. b. Dorsal region of the isopod, at pereonites level, pouch epidermal tissue is absent (arrow) and a decrease in the number of melanophores is observed. c. End of the pereonite, atrophy of the pouch epidermis was observed (arrow). d. e. At pereopods level, an increase in the height of the pouch epithelium is observed and an intense cellular infiltration, mainly lymphocytes (arrows), a few eosinophilic granular cells (asterisk) and desquamation of the epidermal tissue (head arrow). Scale bar: 50 µm. D: dermis, DP: dermal plates, E: epidermis, Hy: hypodermis, M: musculature, Pe: pereonites, Pr: pereopods.

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Parasitism of the isopod <i>Riggia puyensis</i> Rodríguez-Haro et al. in two armored catfish from Pastaza Province (Ecuador)

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[1] Correspondence to: Silvia Elena Plaul E-mail: splaul@fcnym.unlp.edu.ar Orcid: http://orcid.org/0000-0001-7318-7863