Clathrina coriacea

Clathrina coriacea, commonly known as a type of calcareous sponge, serves as a significant biological pest in the context of marine aquaculture. Belonging to the order Clathrinida and family Clathrinidae, this organism is not a traditional crop pest but acts as a nuisance species in marine environments, impacting shellfish farms and various underwater structures.

This sponge primarily infests commercial aquaculture systems, including mollusk cages, seaweed cultivation lines, and water intake pipes. By forming dense mats, the organism creates a physical barrier that restricts water flow, reduces the supply of essential nutrients, and limits oxygen availability for the cultivated species, ultimately leading to reduced yields.

The biology of Clathrina coriacea involves rapid colonization of hard substrates through both sexual and asexual reproduction. The life cycle includes a planktonic larval stage that settles on equipment and begins to grow into a colonial structure. The sponge thrives in environments with steady water movement and high nutrient concentration, which are characteristic of many intensive aquaculture sites.

Damage caused by this species is characterized by thick, leather-like encrustations that are difficult to remove. The economic harm results from the mechanical obstruction of filtering equipment, increased maintenance labor, and the competition for space with high-value crops, which can often lead to the stunting or mortality of shellfish populations.

Management and protection strategies focus on preventive maintenance and site hygiene. Effective control measures include:

• Frequent mechanical removal of sponge colonies using high-pressure water jets.
• Application of non-toxic anti-fouling treatments to gear and cages.
• Regular monitoring and cleaning of intake filtration systems.