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2009 (Vol. 1, Issue: 2)
Article Information:

Toxicity and Behavioural Changes in Heterobranchus bidorsalis Fingerlings Treated with a Micronurient Fertilizer, Agrolyser

U.U. Gabriel, P. Mark and E.E. Orlu
Corresponding Author:  Gabriel U.U. 

Key words:  Opercular beat frequency, tail beat frequency, agrolyser, hybrid catfish, , ,
Vol. 1 , (2): Page No: 34-38
Submitted Accepted Published
2009 June, 10 2009 Sep., 02

Heterobranchus bidorsalis (mean total length, 2.940.34 cm SD; mean weight, 6.750.9 cm SD) was exposed in a daily renewal bioassay to different concentrations of agrolyser (0.00, 1400, 1600, 1800, 2000 and 2200mg/l), a micronutrient fertilizer for 96hrs to assess its toxicity. The opercular (obf), tail beat (obf) frequencies and mortality were monitored during the exposure period. The pattern of response of obf at the various concentrations of agrolyser varied very widely at the exposure duration. The tbf of the fish at the various exposure concentrations generally increased with time peaking at the 48th hour after which it began to decline. Mortality of exposed fish in all the exposure concentrations increased with duration of exposure. Exposed fish showed altered obf with exposure concentration (p<0.05) and time (p>0.05). Cumulative mortality and tbf differed with exposure time and concentrations of agrolyser (p<0.050). Median lethal time for the lowest concentration, 1400mg was 263.83hrs (181.41-667.75, C.L.) which was 2.5times that for the highest concentration. The 96hr lethal concentrations (LC50) at 72 and 96hrs w ere 2975.48mg (2594.50-3995.10 C.L.) and 2340.91mg/l (2175.63-2654.56 C.L.), respectively. Although the fish appeared to be tolerant to acute levels of agrolyser, alteration in the behaviour may affect a number of activities involved with the survival of the fish in the w ild and culture environment.
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  Cite this Reference:
U.U. Gabriel, P. Mark and E.E. Orlu, 2009. Toxicity and Behavioural Changes in Heterobranchus bidorsalis Fingerlings Treated with a Micronurient Fertilizer, Agrolyser.  Research Journal of Environmental and Earth Sciences, 1(2): Page No: 34-38.
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ISSN (Online):  2041-0492
ISSN (Print):   2041-0484
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