Aquaculture and Fishery Management

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Author: search.filters.author.RIBKA MENTA BALCHASubject: search.filters.subject.Anisakid

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    INFESTATION AND EFFECTS OF ANISAKID NEMATODE PARASITES ON THE NILE TILAPIA (Oreochromis niloticus LINNAEUS, 1758) IN LAKE HAWASSA, ETHIOPIA
    (HAWASSA UNIVERSITY, 2024-10) RIBKA MENTA BALCHA
    Contraceacum species that is genus of Anisakid parasites is the most economically important internal fish parasite,that poses serious problem in culture and capture fisheries globally, as well as consumers. This investigation aimed to evaluate the infestations and certain effects of Contraceacum spp. on O. niloticus L. 1758) in Lake Hawassa. The study used a cross-sectional design from December 2023 to May 2024. A total of 180 O. niloticus were taken from the landing site. To assess the water quality, samples of water were taken fro amora gedel. Infestation peaked in February and April each with 56.6% and lowest in December (40.0%). However, highest intensity of Contracaecum spp. was in May (9.66%) and lowest in January with (4.20%). Prevalence of Contracaecum with sex of O. niloticus were statistically not significant.The size of O. niloticus and the presence of Contracaecum were positively correlated. Hematological effects of Contracaecum on O .niloticus between infested and non-infested group were significant (p<0.05) except for neutrophil count sand basophil (p>0.05). The results of the physicochemical parameters showed statistically significant difference with all parameters except ammonia that showed variation, but not statistically significant (p value=0.294). There were positive correlation between physicochemical parameters and the prevalence of Contracaecum, however, negative correlation with dissolved oxygen (r=-0.002). In conclusion, the temperature of the water influences whether the Contracaecum infestation is high or low, depending on the sampled months. Contracaecum parasite prevalence is also influenced by variations in physicochemical parameters. The high prevalence (37.3%) of Contraceacum spp. in muscles of O. niloticus as compared to varied various body organs indicates that consuming raw fish poses a significant health risk to humans. Therefore,it is crucial to eat the fish only well coocked form, at the encysted larvae present in fish muscle can be transmitted to human hosts.