Manjano anemone

Systematic position: The Manjano anemone (Anemonia manjano) belongs to the order Actiniaria and the family Actiniidae. Within the context of marine aquaristics, this organism is classified as a dangerous invasive pest, capable of quickly colonizing any available space in a reef aquarium and suppressing the growth of corals and other invertebrates.

Affected species: The target species for infestation include live rocks, decorative corals (both soft and stony), and other hydrobionts in marine aquarium systems. The anemone actively spreads throughout the volume, filling empty spaces and displacing valuable coral species by consuming available light and nutrient resources.

Biology and life cycle: This species is characterized by a high reproductive rate, primarily through longitudinal fission (an asexual method). Under favorable conditions, such as excess food and intense lighting, a single individual can transform into a colony of dozens within just a few weeks. It is capable of crawling across the substrate to actively occupy new areas.

Nature of damage and harmfulness: The harmfulness lies in the aggressive displacement of neighboring organisms using stinging cells (nematocysts). The Manjano anemone releases toxic compounds that inhibit the growth of surrounding organisms, leading to their degradation or death. Due to its resilience, even microscopic remnants of tissue after mechanical interference can regenerate into a new organism.

Protection measures: Managing the population requires a multifaceted approach, as the anemone is highly resistant to external stressors.

• Mechanical removal (complete extraction with the rock section).
• Biological control methods (introducing predatory fish, such as butterflyfish).
• Chemical treatments involving injections into the base of the anemone.
• Limiting food supply to slow down reproductive rates.