Original Research

Influence of natural silt on the survival of Oreochromis mossambicus yolk sac larvae

L. Smit, H.H. Du Preez, G.J. Steyn
Koedoe | Vol 41, No 1 | a246 | DOI: https://doi.org/10.4102/koedoe.v41i1.246 | © 1998 L. Smit, H.H. Du Preez, G.J. Steyn | This work is licensed under CC Attribution 4.0
Submitted: 31 July 1998 | Published: 31 July 1998

About the author(s)

L. Smit, Rand Afrikaans University, South Africa
H.H. Du Preez, Rand Afrikaans University, South Africa
G.J. Steyn, Rand Afrikaans University, South Africa

Full Text:

PDF (2MB)

Abstract

This study investigates the tolerance of Oreochromis mossambicus yolk sac larvae to natural silt from the Phalaborwa Barrage. Larvae survived silt concentrations lower than 13.2 g silt/I, but were highly active, indicating sublethal stress effects. When silt concentrations exceeded 29 g silt/I, stress reactions such as floating at the surface, gulping air, reduced fin and opercular movements and partial and complete loss of equilibrium were observed. Fish that succumbed exhibited darker pigmentation, and silt and mucus covered bodies. LC,() values were derived as 53.4 g silt/I, 31.7 g silt/I and 19.1 g silt/I for 1 hour, 24 hour and 48 hour exposure periods, respectively. Since these concentrations are much lower than the silt released from the Phalaborwa Barrage during flushing, it can be concluded that the release of high silt concentrations can severely impact the larval fish populations in the Olifants River below the Barrage.

Keywords

silt, fish, larvae, LC,(), Phalaborwa Barrage, Olifants River.

Metrics

Total abstract views: 4513
Total article views: 2974

 

Crossref Citations

1. The use of the urogenital papillae of male feral African sharptooth catfish (Clarias gariepinus) as indicator of exposure to estrogenic chemicals in two polluted dams in an urban nature reserve, Gauteng, South Africa
Taneshka Kruger, Irene Barnhoorn, Johan Jansen van Vuren, Riana Bornman
Ecotoxicology and Environmental Safety  vol: 87  first page: 98  year: 2013  
doi: 10.1016/j.ecoenv.2012.10.004