Perna viridis is a marine bivalve from the order, Mytiloida, and the family, Mytilidae, which is the only family in the Mytiloida order. Mytiloida is the order that all mussels fall under.
Perna viridis
Perna viridis
Common Name: Asian green mussel
Value/Use: Harvested and sold as a food source

Description: Perna viridis usually grow to around 8 to 10 centimeters long. Although, some have grown up to 16.5 cm. Its shell ends forms a downward-pointing beak shape. The periostracum is smooth and dark green. It has lighter coloring around the umbo, the sometimes protruding part of a bivalve formed in its juvenile state. With age, the Perna viridis develops a darker colored shell, but the interior is a pale-blue.

Perna viridis also has a large foot for climbing vertically over sediments stacked on top of it.

Habitat: Coastal waters in the region where the Indian Ocean meets the Pacific are home to Perna viridis. They have been considered an invasive species due to relocation caused by boats, though. Asian green mussels, as they are also called, have dense populations. It can reach a density of 35,000 individuals per square meter. In a group, Perna viridis can attach to rocky surfaces with the help of byssus, or sea silk, which is a silky filament produced by certain bivalves.

Perna viridis can grow fastest at a short distance below the surface with high salinity, or dissolved salt content, and high phytoplankton concentration.

Niche: Asian green mussels feed on phytoplankton, zooplanktons and organic materials suspended in the water. It suffers from some of the common bivalve threats, such as humans, fish, seastars, crustaceans and octopuses. The food chain is not kind to this hebrivorous mollusk. As a protection, it is capable of excreting toxins produced by consumed dinoflaggellates. This provides more problems for humans, as it can rust pipes and damage environments that it is placed in.
It notoriously clogs water pipes and ruins marine equipment. It produces ammonia, which corrodes copper-based alloys in pipes. In habitats that it invades, it has been known to introduce harmful parasites and disease. It reproduces quickly, so it poses a serious threat.
Reproduction: Perna viridis has no hermaphrodites and fertilizes externally. Temperature is shown to have an effect on sexual development in these mussels. They spawn twice a year between spring and autumn. It takes about 8 hours for the zygote to become a larva after spawning. The larvae take 10-12 days to metamorphosize into the juvenile and reaching the surface to settle. It takes 2-3 months for these juveniles to reach sexual maturity. Adult Perna viridis can live for 2-3 years. Due to its fast growth, it is capable of out-competing other similar organisms and can cause big changes in several ecological relationships.

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