A survey of the parasites of Nile tilapia (Oreochromis niloticus (L.)) in the Philippines

Date of Publication

1989

Document Type

Master's Thesis

Degree Name

Master of Science in Biology

Subject Categories

Biology

College

College of Science

Department/Unit

Biology

Abstract/Summary

Parasitological investigations, covering a period of 10 months were conducted on 600 Nile tilapia from fresh and brackishwater cultured and freshwater wild populations in the Philippines. From these examinations, 21 different species of parasites (10 Protozoa, 6 Monogenea, 3 Digenea, 1 Copepoda and 1 Mollusca) were recovered. Among these, 13 have been assigned specific identifications: Trichodina centrostrigata Basson, Van As and Paperna, 1983 T. acuta Lom, 1970 T. heterodentata Duncan, 1977 Tripartiella clavodonta Basson and Van As, 1987 T. tilapiae (Duncan, 1977) Cryptobia branchialis Nie in Chen, 1955 Enterogyrus cichlidarum Paperna, 1963 Cichlidogyrus tilapiae Paperna, 1960 C. tiberianus Paperna, 1960 C. sclerosus Paperna and Thurston, 1969 C. longicornis longicornis Paperna and Thurston, 1969 Transversotrema laruei Velasquez, 1958 and Caligus epidemicus Hewitt, 1971). One species (Trichodina n. sp.) is new to science. Four species are new geographical records for the Philippines (Trichodina n. sp., T. clavodonta and T. tilapiae, and E. cichlidarum) while three have not been previously recorded from Nile tilapia (Trichodina n. sp., T. clavodonta and T. tilapiae).Analyses were made on the changes in the parasite fauna of tilapia from fry to marketable size. Of all the parasite species for which age-count analyses could be conducted, five showed statistically significant changes in parasite counts with host age. These are T. laruei and C. epidemicus in brackishwater collections and Cichlidogyrus spp., E. cichlidarum and Unionidae gen sp. glochidia in fresh water.Observations are also made on the geographical distribution of these parasites in the Philippines and a preliminary assessment of the threat

they may pose to the culture of tilapia is given based on a review of the literature.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG02732

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

191 leaves

Keywords

Fishes -- Parasites -- Philippines; Tilapia; Fishes -- Diseases

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