Janiridae
Systematic position: The family Janiridae belongs to the order Isopoda, class Malacostraca. These small crustaceans are primarily marine, inhabiting crevices and algal mats, though their presence in aquaculture environments can lead to significant economic losses.
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Janiridae
Crops damaged: They primarily affect marine macroalgae cultivated in coastal farming systems. Economically valuable species like kelp (Laminaria) are most susceptible to damage when farmed in high-density areas, providing an ideal microenvironment for Janiridae populations.
Biology and life cycle: Janiridae exhibit a direct life cycle, with juveniles hatching from brood pouches in a form resembling miniature adults. This ensures a high survival rate in stable environmental conditions, allowing them to rapidly colonize new substrates or farming ropes placed in the ocean.
Nature of damage and harmfulness: The pests feed on the surface tissues and interstitial structures of marine plants. By creating deep lesions and penetrating the outer protective layer of the algae, they facilitate the entry of pathogens, causing blade necrosis, structural weakening, and biomass reduction.
Protection measures: Management involves regular inspection of growth ropes and nets to detect early infestation. Physical removal via pressurized seawater spray or short-term exposure to hypersaline or freshwater dips can be effective. Maintaining good water circulation and avoiding nutrient excess helps to discourage massive outbreaks.