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Effect of insecticide on Aquatic Animals

Effect of insecticide on Aquatic Animals

Insecticides are widely used to control pests in agriculture, forestry, and public health. However, their use has unintended consequences on aquatic animals, as these chemicals can find their way into waterways through various means, such as runoff from treated fields, leaching from soil, or aerial spray drift. The effects of insecticides on aquatic animals can be detrimental to both individual organisms and entire ecosystems.

One of the most well-known effects of insecticides on aquatic animals is acute toxicity. Insecticides such as organophosphates and carbamates act on the nervous system of insects, but they can also have similar effects on non-target organisms, including aquatic animals such as fish, crustaceans, and amphibians. Acute toxicity can occur when organisms are exposed to high concentrations of insecticides over a short period of time, causing immediate death or severe impairment of their physiological functions.

Another effect of insecticides on aquatic animals is sublethal toxicity. Sublethal toxicity occurs when organisms are exposed to lower concentrations of insecticides over a longer period of time, leading to chronic effects on their health and behavior. For example, exposure to sublethal concentrations of insecticides can impair the reproductive success of fish, reduce the growth rates of crustaceans, and alter the behavior of amphibians. These sublethal effects can have long-term impacts on the population dynamics of aquatic animals, as well as on the structure and function of their ecosystems.

In addition to acute and sublethal toxicity, insecticides can also have indirect effects on aquatic animals through the disruption of food webs. For example, insecticides that target insects can also affect the populations of insects that serve as food for fish and other aquatic predators. This can lead to cascading effects throughout the food web, resulting in reduced prey availability and altered predator-prey interactions. Furthermore, the loss of insect populations can also affect ecosystem services, such as pollination and decomposition, that are essential for the functioning of terrestrial and aquatic ecosystems alike.

The impacts of insecticides on aquatic animals can be particularly severe in agricultural landscapes, where large-scale use of insecticides is common. Runoff from treated fields can carry insecticides into nearby waterways, where they can accumulate and persist over time. Furthermore, the use of insecticides can also affect the physical and chemical properties of aquatic habitats, such as water temperature, dissolved oxygen levels, and nutrient availability. These changes can have cascading effects on the entire ecosystem, from the smallest microorganisms to the largest predators.

To mitigate the effects of insecticides on aquatic animals, several strategies can be employed. One approach is to reduce the overall use of insecticides, particularly those that are known to have high toxicity to non-target organisms. This can be achieved through the adoption of integrated pest management (IPM) practices, which prioritize the use of non-chemical methods to control pests, such as crop rotation, biological control, and cultural practices. IPM can also reduce the risk of developing insecticide resistance in target pests, which can further reduce the need for insecticide use.

Another approach to mitigating the effects of insecticides on aquatic animals is to improve the design and regulation of insecticides. This can include the development of insecticides that are more selective in their target species, as well as the adoption of buffer zones and other measures to reduce the risk of runoff and spray drift. Additionally, regulatory agencies can require more stringent testing of insecticides for their potential effects on aquatic animals, including both acute and sublethal toxicity, as well as their impacts on ecosystem function.

Finally, improving the monitoring and assessment of the impacts of insecticides on aquatic animals is essential for identifying and addressing emerging threats. This can involve the use of biomonitoring tools, such as bioassays and biomarkers, to detect the presence of insecticides.

 

Dr.kumari Sugandha priya,

Department of Zoology

Patna Women’s College