Abstract
The acute static renewal test of a botanical pesticide - azadirachtin for the freshwater catfish, Heteropneustes fossilis has been performed to determine the LC50 values at different exposure period. The LC50 values at various exposure periods are 173.06 mg L -1 for 24h; 80.69 mg L -1 for 48h; 58.57 mg L -1 for 72h and 52.35 mg L -1 for 96h. The upper confidence limits were 196.87, 86.91, 79.20 and 70.04 mg L -1 for 24, 48, 72 and 96 h and lower confidence limits were 154.01, 74.24, 37.33 and 33.83 mg L -1 , respectively. These results indicate that azadirachtin exposure to the fish caused toxic effects.
Highlights
Human destructive influence on the aquatic environment is in the form of sub-lethal pollution, which is caused by the use of pesticides by the human beings for their benefits – control of insect vectors of disease and increased yield of many crops
The 24h LC50 of neem leaf extract for juveniles of Prochilodus lineatus has been reported to be as 4.8 g L-1 (WINKALER et al, 2007)
The toxicity of water-extract of mesocarp of neem (Azadirachta indica) fruit has been tested for hybrid, Heteroclarias and LC50 for 96h was found as 81.28 mg L-1 (AKINWANDE et al, 2007)
Summary
Human destructive influence on the aquatic environment is in the form of sub-lethal pollution, which is caused by the use of pesticides by the human beings for their benefits – control of insect vectors of disease and increased yield of many crops. After entering into aquatic ecosystems, these pesticides have a negative effect on aquatic life. The effects of these pesticides may be lethal or sublethal. The use of persistent organochlorines and organophosphates has led to hazardous effects on environment and human beings which directed the attention towards the use of alternative chemicals. The alternative for the chemical pesticides came in the form of botanical pesticides which are plantderived materials. Because of compound is a natural product does not ensure that it is safe, toxicological and environmental
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
