for this preference is its intolerance for salinity and sedmentation.The highest concentrations of M. Californianus are found in the intertidal zone. Literature values for the vertical height are estimates at best, but one study suggests that 2.4 to 3.0m above the lower low water mark is the upper limit of the mussels and this fluctuates greatly according to seasonal temperatures. Cover limits of the M. Californianus in the intertidal zone are limited by the presence of predators, primarily the seastar. Below the intertidal zone, M. Californianus has been observed on depths of up to 30m off coast. However these subtidal beds are not continuous, and occur in isolated patches. The California sea and Bay mussels are relatively common along the rocky coastline. Some in bays and estuaries, although is rarely found here perhaps because egg, sperm and larvae cannot withstand dilutions below 75% sea water. M. Californianus sets on barnacles, old mussel shell, and newly exposed hard surfaces. Density of newly settled M. Californianus has been found to be highest on filamentous algae. They prefer to set on byssal threads from adults. It probably takes many years for the mytilus to become established in the high intertidal zone at approximately t1.8 to t2.4m above mean lower low water. Establishment is faster at lower levels.Man’s Manipulation of the coastal zone could provide additional habitats for mussels. Piers, floating marinas, jetties, and pilings for oil rigs are examples of surfaces idea for setting mussels. Temperature plays an important role in growth. In studies, the growth of M. Californianus was most rapid at 17-20 degrees C. Specifically in southern California, growth is fastest during the colder months and slowest in mid-summer or above 20 degrees C.Because mussels are distributed along the coast, they are often subjected to sewage and other kinds of pollution. The mussels may be unsafe to eat and must be depurated before ma...
