Black-crowned night heron

The black-crowned night heron (Nycticorax nycticorax) is a member of the Pelecaniformes order and the Ardeidae family. In agricultural and aquacultural contexts, it is identified as a significant biological pest that targets fish stocks and occasionally impacts crops in wetland-based farming systems.

The primary economic damage occurs in aquaculture facilities, where these birds prey heavily on fish fry and juveniles. Due to their nocturnal behavior, night herons can cause substantial losses to fish production, often bypassing daytime security measures implemented by farm managers.

The biology of the species revolves around their colonial nesting habits and nocturnal feeding patterns. They are opportunistic predators, highly adaptable to artificial habitats provided by fish farms. During the breeding season, their demand for food increases significantly, leading to higher predation rates on stocked fish populations.

Damage caused by this species is both direct and indirect. Direct damage includes the lethal reduction of fish biomass. Indirect damage involves the degradation of water quality through the accumulation of guano in intensive rearing ponds, which alters the chemical balance and can lead to algal blooms and oxygen depletion.

• Installation of overhead exclusion netting on aquaculture ponds.
• Utilization of automated laser deterrent systems.
• Deployment of bio-acoustic devices to mimic distress calls.
• Habitat modification to reduce nesting opportunities near critical assets.