Common carp

The common carp (Cyprinus carpio) is a member of the Cyprinidae family and the order Cypriniformes. While highly regarded in aquaculture, it is often classified as an agricultural pest in regions where shallow-water farming, such as rice paddy cultivation, is prevalent, due to its destructive foraging habits.

The biological cycle of the common carp involves bottom-feeding behavior that is highly disruptive. By utilizing its mouth to stir up bottom sediments, the fish uproots aquatic and semi-aquatic plants, searching for invertebrates and organic matter. This activity directly interferes with the early growth stages of various crops planted in flooded environments.

Crops primarily affected include rice, as the carp easily dislodges young seedlings and damages root systems. In addition to direct plant destruction, the increased turbidity caused by carp foraging prevents necessary light penetration, significantly hindering the photosynthesis and development of aquatic crops.

The economic impact of common carp includes yield losses in paddy fields and the degradation of drainage infrastructure. Their constant movement and feeding patterns lead to bank erosion, which can destabilize the edges of agricultural canals and cause long-term maintenance issues for farmers.

To mitigate the damage caused by common carp, farmers should implement the following measures:

• Installing fine-mesh physical barriers at water inlets to exclude adult fish.
• Managing water levels strictly during the critical seedling establishment phase.
• Utilizing deterrents or ultrasound devices to keep fish away from sensitive areas.
• Implementing regular maintenance of canal slopes using erosion-resistant materials.