Physiology effects of the insecticide cartap hydrochloride on silver barb ( Barbonymus gonionotus )
Year: 2025
Type: article
Abstract: Cartap hydrochloride (CH) is commonly used to control insect pests in the Mekong Delta, and this study assesses the effects of CH (1%, 10%, and 20% of the median lethal concentration at 96 hr value) on brain cholinesterase activity, food intake, feed conversion rate, and growth of silver barb (Barbonymus gonionotus) under laboratory conditions. The inhibition of the acetylcholinesterase activity increased with both concentration and time, reaching its peak 9 hr after exposure. After 96 hr, the inhibition remained at 10.4% in fish exposed to the lowest concentration and at 18.2% and 19.9% in fish exposed to the two highest concentrations. After 48 hr, the fish were placed in clean water, but the inhibition levels at the two highest concentrations still remained at 20% until Day 7, and only recovered fully after 14 days. The feed intake was similar between the control and all treatments, but the fish exposed to CH had higher feed conversion ratio than the fish in the control during the first 30 days. This indicates an increased stress in the exposed fish and that more energy was used for detoxification. As a result, fish in the control had gained most in weight after 60 days, whereas fish exposed to the highest level of CH had gained the least, and there was a significant effect of CH on fish growth. It is concluded that expected water levels of CH from doses commonly sprayed on rice fields may affect the health of fish in these habitats, and the use of CH should be limited, as it may negatively affect healthy fish production in the Mekong Delta, Vietnam.
Authors: Tam Thanh Nguyen, Håkan Berg, Loi Ngoc Nguyen, Nguyen Quoc Pham, Cong Van Nguyen
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
SDG: Zero hunger
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W4411207417