Arctic char

The Arctic char (Salvelinus alpinus) is a member of the Salmoniformes order and the Salmonidae family. In agricultural practice, specifically within integrated aquaponic systems, this fish species can act as an unconventional pest that jeopardizes the health of hydroponically grown crops.

These fish damage crops by directly attacking the root systems of plants submerged in the water. In high-density aquaculture setups, if the fish are not sufficiently fed or if the filtration system is inadequate, the char begins to graze on root hairs and primary roots of leafy greens and vegetables.

The biology of Salvelinus alpinus is marked by rapid growth and a high protein requirement. During their development stages, individuals exhibit opportunistic feeding behavior. When traditional feed sources are depleted or restricted, their natural predatory instinct shifts toward the readily available organic matter found in the root zone of agricultural plants.

The damage caused is primarily mechanical, leading to the destruction of root tissues. This injury creates entry points for water-borne fungi and bacteria, leading to root rot and systemic plant disease. The loss of functional root mass prevents nutrient uptake, leading to chlorosis, stunted growth, and ultimate plant failure.

Protection strategies focus on structural segregation and proper nutritional management. Growers should implement physical barriers, such as fine-mesh screens or separate fish-rearing tanks, to isolate roots from the fish. Additionally, maintaining a consistent feeding schedule for the fish population is essential to reduce the risk of opportunistic plant consumption.