Effects of acetylcholinesterase-inhibiting chemicals on Nile tilapia (Oreochromis niloticus Linn) at pre-and post-hatching stages of development
Issue Date
10-2009
Abstract
The toxic effect of carbaryl and chlorpyrifos (CPF) insecticides were evaluated on the early development stages of Oreochromis niloticus Linn. A number of morphological abnormalities were observed during the course of the experiment. A cute exposure (24-hour LC50) experiment determined the mortality pattern of newly hatched ). Niloticus exposed to different concentrations of the toxicants. Median hatchability performance (HC50) of eggs was also estimated. The 24-Hour LC50 estimated for carbaryl and CPF were 6.07 mg/L and 22.39 ug/L, respectively. The estimated HC50, values were 6.04 mg/L for CPF and 21.15 ug/L for CPF. Sub-chronic exposure to residual levels of both test materials resulted in high inhibition levels of AChE activity. Analysis revealed significant differences in AChE activity among O. niloticus exposed to either carbaryl (KW=11.58, P < 0.05) or CPF (KW=12.243, P<0.05) at different lengths of exposure period. For both test materials, the peak of AChE activity was recorded on the 7th day of exposure. AChE activity, however, was found not proportional to the length of exposure period. AChE activity in the test fish recovered on the 11th day of the recovery period, with about 92% recovery for the carbaryl-exposed and about 93% for the CPF-exposed.
Source or Periodical Title
Philippine Entomologist
ISSN
0048-3753
Volume
23
Issue
2
Page
155-173
Document Type
Article
Frequency
semi-annually
Physical Description
graphs
Language
English
Recommended Citation
Liwag, Adelina G.; Ocampo, Pablo P.; and Ubaldo, Nilda N., "Effects of acetylcholinesterase-inhibiting chemicals on Nile tilapia (Oreochromis niloticus Linn) at pre-and post-hatching stages of development" (2009). Journal Article. 5383.
https://www.ukdr.uplb.edu.ph/journal-articles/5383
En – AGROVOC descriptors
OREOCHROMIS NILOTICUS; TILAPIA; PESTICIDE EXPOSURE; CARBARYL; CHLORPYRIFOS; ACETYLCHOLINESTERASE