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Biology of Crassicutis cichlasomae, a parasite of cichlid fishes in Mexico and Central America

Published online by Cambridge University Press:  05 June 2009

T. Scholz ,
M.C.F. Pech-Ek  and
R. Rodriguez-Canul
T. Scholz
Affiliation:
Institute of Parasitolog, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic.
M.C.F. Pech-Ek
Affiliation:
Laboratorio de Parasitología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Carr. Ant. a Progreso Km 6, A.P.73 “Cordeméx”, C.P. 973 10 Mérida, Yucatán, México
R. Rodriguez-Canul
Affiliation:
Laboratorio de Parasitología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Carr. Ant. a Progreso Km 6, A.P.73 “Cordeméx”, C.P. 973 10 Mérida, Yucatán, México
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Abstract

Field study on the biology of Crassicutis cichlasomae Manter, 1936 (Digenea: Homalometridae) was carried out in a small swamp in a limestone factory near Mérida, Yucatán, Mexico. Aquatic snails, Littorina (Littoridinopsis) angulifera, harbouring C. cichlasomae rediae, cercariae and metacercariae, served both as the first and second intermediate hosts. Feeding experiments confirmed the conspecificity of metacercariae from naturally infected snails with adults from naturally infected fish. Gravid C. cichlasomae worms were obtained from experimentally infected fish 19 days post exposure at 22–24°C. Examination of fish from the swamp in Mitza and other localities in the Yucatan Peninsula showed that the cichlids Cichlasoma urophthalmus and C. meeki were definitive hosts of C. cichlasomae. There was no pronounced preference of C. cichlasomae adults for the site of their location in the intestine of the definitive host; a slightly higher proportion (41%) of worms was only found in the anterior third of the gut. The time of miracidium development varied from 18.5 to 27.5 days; different temperature (20.1–35.7°C) or light/darkness regimes influenced only slightly the rate of embryonic development, with shorter development times at higher temperature (34.8–35.7°C) and constant darkness and/or light. With the exception of the sporocyst, all developmental stages are described and figured.

Type
Research Papers
Information
Journal of Helminthology , Volume 69 , Issue 1 , March 1995 , pp. 69 - 75
Copyright
Copyright © Cambridge University Press 1995

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