Cercopagididae

While they do not affect terrestrial crops, their impact on aquaculture is substantial. Cercopagididae species are opportunistic predators that feed on smaller zooplankton, such as Daphnia, which are essential nutritional sources for fish fry. This predation creates intense food competition, directly hindering the growth rates and survival of farmed fish.

The biology of these organisms is characterized by rapid population growth through parthenogenesis under optimal environmental conditions. When environmental stressors occur, they produce resistant resting eggs (ephippia). These eggs can survive desiccation, freezing, and digestive tracts of birds, ensuring the long-term persistence of the population in a contaminated water body.

Their harmfulness is twofold: direct competition for food and mechanical damage to juvenile fish. The barbed caudal appendages of these crustaceans can irritate or damage the delicate tissues of fish fry, making them susceptible to secondary bacterial and fungal infections. This often results in increased mortality rates among fingerlings in hatchery environments.

Integrated management strategies for controlling Cercopagididae in aquaculture require careful planning and consistent water management. Essential practices include:

• Complete drainage and drying of pond beds to eliminate resting eggs.
• Application of lime to pond bottoms to alter pH and reduce survival rates of crustacean populations.
• Monitoring incoming water sources to prevent accidental introduction of the pest.
• Managing fish stocking densities to favor species that predate on planktonic pests.