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Asian Journal of Animal and Veterinary Advances

Year: 2013 | Volume: 8 | Issue: 7 | Page No.: 852-862
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Authors

M.M. Rapatsa

N.A.G. Moyo

Keywords

Research Article

Haematological, Histological and Growth Characteristics of Oreochromis mossambicus Exposed to Effective Microorganisms in Organically Manured Aquadams

M.M. Rapatsa and N.A.G. Moyo
The aim of this study is to investigate the effect of Effective Microorganisms (EM) on the water quality, growth performance, haematological and histological changes in Oreochromis mossambicus. Five different EM dosages 7000 L of water (1, 3, 7, 10 and 15 L) and the control were assigned to aquadams fertilized with chicken manure in a completely randomized design replicated twice. Bicarbonate alkalinity and potassium increased with higher dosage of EM. This could have probably created favourable conditions for the proliferation of phytoplankton. Ammonia and phosphate were not significantly affected by the different EM dosages. There was a significant difference (p<0.05) in the RBC, WBC, HGB, HCT, MCHC, MCH and MCV in the different EM treatments. However, there was a weak dose-response relationship between the haematological parameters and EM dosage. Vacuolation, cellular swelling, nuclei pleomorphism, increase in kupffer cells and dilated sinusoids were the histological alterations observed as the EM dosage increased. Fish yield was best described by a parabolic function. The haematological and histological parameters showed that the fish were under stress at the highest EM dosage and this led to poor growth performance.
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