Title

Toxicity, bioaccumulation and histopathological studies of Tilapia nilotica following sublethal exposure to carbaryl.

Date of Publication

1993

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Biology Major in Ecology

College

College of Science

Department/Unit

Biology

Thesis Adviser

Santiago, Dr. Florenda

Defense Panel Member

Carandang, Dr. Jose Santos
Claveria, Dr. Florencia
Relon, Dr. Milagros
Janairo, Dr. Gerardo

Abstract/Summary

The 96-hour LC50 of carbaryl to three month-old Tilapia nilotica was determined at 8.29 mg/l. The sublethal concentration of 6.22 mg/l (75 of 96-hour LC50 carbaryl) was used for the bioaccumulation and histopathological studies.Mean carbaryl residues (mg/l) were found highest in the treated pre-starved liver (12.79), followed by kidney (8.70) and lowest in the brain (0.59). Residue of the insecticide was found highest in the treated fed muscle (4.88 mg/l).Swollen and vacuolated hepatocytes and dilated sinusoids were noted in carbaryl-treated liver. Some arterial walls in treated pre-started liver showed shrinkage. Epithelial cells of the portal vein and bile duct remained intact. Glomerular degeneration and distention of the capsular space were observed in carbaryl-exposed tilapia. No histological changes in the brain of both treated and fed and treated pre-starved T. nilotica were found following carbaryl intoxication.

Abstract Format

html

Format

Print

Accession Number

TG02219

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

106 leaves

Keywords

Tilapia.; Carbaryl.; Insecticides -- Toxicology.

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