A new species of Trichodina Ehrenberg, 1830 collected from the skin and fins of farmed North African catfish Clarias gariepinus (Burchell) fingerlings, is described. The new species can be distinguished from other trichodinids by the characteristics of the adhesive disc, especially by the great number of denticles. Trichodina merciae n. sp. is morphologically similar to T. renicola (Mueller, 1931) and T. marplatensis Martorelli, Marcotegui & Alda, 2008, in the number of denticles, but differs in the morphometric data, denticle morphology, environment and location. Trichodina merciae n. sp. has broad sickle-shaped blades and thin, straight rays, while T. marplatensis has broad club-shaped blades and wide S-shaped rays. Besides, denticle length, blade length, ray length, width of central part and denticle span of the new species are greater than T. marplatensis. However, the diameter of denticle ring and the diameter of the central area in T. marplatensis is larger than the ones in T. merciae n. sp. This is the first record of freshwater ectoparasite trichodinid with an average number of denticles greater than 50.
La bioseguridad en la acuicultura se ocupa de la gestión de la sanidad de los animales acuáticos y la reducción de los riesgos a la salud pública asociados con la producción y el consumo de productos acuícolas. Particularmente, las enfermedades son un tema de atención en todo sistema de cría y producción de animales. En la acuicultura cubana, una de las especies ícticas de mayor importancia es el pez gato africano Clarias gariepinus. Esta especie introducida es afectada por protozoos ciliados parásitos de la familia Trichodinidae durante los primeros estadios de vida. El presente trabajo se trazó como objetivo, identificar y caracterizar las especies de tricodínidos que afectan el cultivo de C. gariepinus en la estación de alevinaje La Juventud, Provincia Pinar del Río, Cuba. Dichas especies identificadas y caracterizadas fueron T. heterodentata, T. acuta y T. merciae, las cuales son consideradas peligros biológicos para el cultivo de este pez. Estos resultados constituyen el primer paso para desarrollar un análisis de riesgo que garantice un manejo adecuado de la bioseguridad en las estaciones acuícolas.
Two monogeneans species were collected from gills of Labeo, Labeo rohita (Hamilton, 1822) and silver carp, Hypophthalmichthys molitrix Valenciennes, 1844 of four localities in the country: "La Sierpe" Fish hatchery and Zaza reservoir (Sancti Spíritus province); "Carlos Manuel de Céspedes" Fish hatchery (Santiago de Cuba province); and in the Aquaculture Technologies Company, EDTA (Havana province). The two species were identified according to their morphological characteristics and morphometric measures as Dactylogyrus labei Musselius and Gussev, 1976 (Gussev, 1976) from L. rohita; and Dactylogyrus hypophthalmichthys Achmerow, 1952 from H. molitrix. The collected parasites were set in ammonium-picrate and glycerin solution, and mounted in gelatin glycerin. Drawings, digital images and morphometric data were presented for each species. These new monogeneans records for Cuba also represent a new world geographical location.
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