TY - JOUR AU - Arguedas C., Donald AU - Ortega S., Cesar AU - Martínez C., Simón AU - Astroza C., Angel PY - 2017/09/28 Y2 - 2024/03/28 TI - Parasites of Nile Tilapia larvae Oreochromis niloticus (Pisces: Cichlidae) in concrete ponds in Guanacaste, Northern Costa Rica JF - UNED Research Journal JA - URJ VL - 9 IS - 2 SE - Articles DO - 10.22458/urj.v9i2.1904 UR - https://revistas.uned.ac.cr/index.php/cuadernos/article/view/1904 SP - AB - <span lang="en-GB">Tilapia is the second most important cultured species in the world fish culture but it can be affected by parasites. We conducted a cross-sectional parasitic study in tilapia larvae during sexual reversion for two seasons in Costa Rica. A total of 320 larvae from a concrete pond were necropsied and we found ten parasite species: </span><span class="CharOverride-5" lang="en-GB">Ichtyobodo sp., Apiosoma sp., Chillodonella sp., Heteropollaria sp., Trichodina sp.,</span><span lang="en-GB"> </span><span class="CharOverride-5" lang="en-GB">Dactylogyrus sp.</span><span lang="en-GB">, </span><span class="CharOverride-5" lang="en-GB">Girodactylus sp., Centrocestus sp.</span><span lang="en-GB">, lasidies and glochidies (two larval forms). These were classified in five taxonomic groups (two subtypes of protozoa, two metazoan classes and a type of mollusk). Protozoans and monogeneans (except </span><span class="CharOverride-5" lang="en-GB">Trichodina sp.) </span><span lang="en-GB">had a higher prevalence in the rainy season, when water had more solid waste, while digeneans and molluscs were more prevalent in the dry season, with different infection dynamics over gills, skin, fins and head.</span> ER -