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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 5, No. 1, 2001, pp. 63-68
Bioline Code: ja01010
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 5, No. 1, 2001, pp. 63-68

 en Sublethal Effects of Ammoniacal Fertilizer Effluents on three Commercial Fish Species from Niger Delta Area, Nigeria
EKWEOZOR, I.K.E, BOBMANUEL N.O.K; GABRIEL, U.U

Abstract

Sublethal effects of various concentrations of fertilizer effluents on the tail beat frequency per minute (TBF min.-1) and opercular beat frequency per minute. (OBF min-1) of Orechromis niloticus check for this species in other resources , Clarias gariepinus check for this species in other resources and hybrid ( Heterobranchus bidorsalis check for this species in other resources (female) x C. gariepinus (male)) were examined in a static 96hr. bioassay under laboratory conditions. Effluent concentration, ammmonia (ionised and un-ionised), urea and pH significantly affected TBF and OBF of the three species. Ammonia particularly, the un-ionised form exacted the most significant effect on TBF and OBF. OBF appears be a more sensitive indicator of stress than TBF and may therefore be more suitable for detecting sublethal physiological effects of pollutants. This study further revealed that the fertilizer effluents have variable compositions whose values may far exceed the allowable limits and hence may pose great danger to the aquatic environment. @ JASEM

 
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