Journal of Agriculture, Biotechnology & Ecology, 8(1), 98-105, 2015
Survival Temperature of Nematodes from the Freshwater
Fish, Parachanna obscura
E. M. Oden,* J.A. Okete** and U. Jerad*
*Department of Zoology and Environmental Biology, University of Calabar,
**Department of Biological Sciences, Federal University of Agriculture,
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Parachanna obscura is a major fish species in the Calabar Great Kwa River, Nigeria. It is consumed by about 70% of people within and without Cross River State almost on daily basis. However, the fish harbors a great number of nematodes. A total of 33 fishes (16 larvae and 17adults) from the Great Kwa River were sampled between October and December to determine the temperature range at which the parasitizing nematodes survive. One hundred and eighty-seven (187) nematodes were extracted from the 33 fishes within the months of study. The nematodes were identified as Contracaecum and Camallanus species. Generally, the larvae survived better than the adult nematodes. A decrease in temperature below 220C significantly impaired the survival rate and temperatures above 600C completely eliminated the nematodes. Therefore, for safe public consumption, P.obscura should be dried at >600C for at least 30 minutes to ensure total elimination of nematodes.
Keywords: Parachana obscura, nematodes, temperature, Great Kwa River, Calabar, Nigeria.
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