Parasites of nile tilapia (Oreochromis niloticus) in the Philippines.
1986
Natividad J.M. | Reantaso M.G.B. | Arthur J.R.
From October 1985 to April 1986, detailed parasitological examinations were performed on 175 juvenile and adult Nile tilapia (Oreochromis niloticus). Seventeen different species of parasites (eight Protozoa, five Monogenea, two Digenea, one Copepoda and one Isopoda) were recovered. Parasites commonly encountered during this survey were Trichodina spp. (T. acuta Lom, 1970; T. centrostigata Basson, van As, and Paperna, 1983; T. heterodentata Duncan, 1973; and Trichodina sp.), Cryptobia branchialis Nie in Chen, 1955; and Cichlidogyrus spp. (C. sclerosus Paperna and Thurston, 1969; C. tilapiae Paperna, 1960; C. tiberianus Paperna, 1960; and C. longicomis longicornis Paperna and Thurston, 1969) in freshwater, and C. branchialis and Caligus epidemicus Hewitt, 1971 in brackishwater collections. Other parasites which were less frequently encountered are Trichodinidae gen. sp., Apiosoma sp., Verticella sp., Gyrodactylus sp., Digenean metacercariae and juvenile grathiid isopods. Although no gross pathology due to parasitic infection was observed, several of the species recovered have been reported to cause diseases in other cultured fishes. A number of the parasites identified were believed to be exotic to the Philippines. Care should thus be taken that they are not introduced into new bodies of water along with Nile tilapia stocked for aquaculture purposes.
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