Predation and Competition

Mussels are susceptible to predation by fish (snapper and leatherjackets), crabs and starfish. However, if mussels are grown in areas where there is a natural spat fall, then fouling by mussel spat becomes a major problem. Growth is inhibited by competition for space with other sessile organisms such as barnacles, tunicates, bryozans, algae, native oysters and tube dwelling amphipods, which are also filter feeders and reduce the food available to mussels. Although not harmful to the mussels themselves, growing areas may occasionally suffer from outbreaks of harmful toxic algae, which the mussels consume. When this occurs, the mussels are unfit for human consumption.

Processing, Byproducts and Utilization

Depuration

Mussel is a good indicator of faecal pollution of aquatic environment. It is easy to purify mussels of bacterial pollution since they cleanse themselves when kept in clean seawater. Studies conducted by the Central Institute of Fisheries Technology (CIFT) on various depuration methods in P. viridis gave the best results when the mussels were kept for 18 hrs in clean seawater collected from the natural habitat of the mussel.