Gross and histopathological lesions of the internal organs of catfish (Clarias gariepinus), tilapia (Oreochromis niloticus) and bighead carp (Aristhicthys nobilis) subjected to wastewater with varying levels of biological oxygen demand (BOD)

Professorial Chair Lecture

UPLB Faculty, Staff, and Students Professorial Chair Lecture

Date

6-2007

Abstract

An experiment was conducted to determine the gross and histopathologic changes in the gills, liver and spleen of catfish (Clarias gariepinus), Tilapia (Oreochromis niloticus), and Bighead Carp (Aristhicthys nobilis) subjected to swine effluents of varying degrees of biological oxygen demand (BOD). Each species of fish were equally divided and classified into four treatment groups. Treatment 1 had 719 ± 94 mg/L BOD, treatment 2 had 190 mg/L BOD, and treatment 3 had 57 ± 19 mg/L BOD and control had 1.3 mg/L BOD.

Gross lesions observed in the gills were congestion, increased presence of mucus and paleness. The liver lesions were congestion, hemorrhage and enlargement. Congestion, hemorrhage and edema were the circulatory lesions found in the kidney. There was congestion, enlargement and atrophy observed in the spleen. The histopathologic lesions found in the gills were congestion, hemorrhage, hyperplasia, fusion of the secondary lamellae, lamellar aneurysm, clubbing, and epithelial lifting. Lesions in the liver were necrosis and hemosiderosis. Microscopic lesions found in the kidney included congestion, hemorrhage, hemosiderosis, degeneration and necrosis. Fish submerged in wastewater with high BOD concentration (Treatment Groups were found to have the highest degree of lesions). The results of the study show the strong influences of high BOD in the development of pathologic lesions in the three species of fish.

Location

UPLB Main Library Special Collections Section (USCS)

College

College of Veterinary Medicine (CVM)

Language

English

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