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A simple criterion is that live mussels, when in the air, will shut tightly when disturbed. Open, unresponsive mussels are dead, and must be discarded. Unusually heavy, wild-caught, closed mussels may be discarded as they may contain only mud or sand. (They can be tested by slightly opening the shell halves.)
The Dreissenidae are a family of small freshwater aquatic bivalve molluscs, commonly called mussels although not at all closely related to true mussels. The shells of these bivalves are shaped somewhat like those of true mussels, which they also resemble in attaching themselves to a hard substrate such as stone using a byssus; however, this group is more closely related to the venus clams ().
In China and Japan, where it is native, the mussels are found in intertidal zones with densities up to 2500 individuals per square metre. In Australia, as an invasive species , they are found from 0.5 to 4 metres ( 1 + 1 ⁄ 2 to 13 feet) below the surface of the water in slightly higher densities.
During the first year mussels typically grow to ~ 20 millimetres (25 ⁄ 32 in), reaching ~ 25–30 millimetres (63 ⁄ 64 – 1 + 3 ⁄ 16 in) at the end of the second year. Growth rates and final size depend largely on water temperature and the time of the year when the individuals are born, although calcium concentrations, pollution, food ...
Microcondylaea compressa can reach a length of about 99 millimetres (3.9 in) and a width of 45 millimetres (1.8 in). Shells are quite elongated and laterally compressed. The external surface is light brown to brown with living mussels (empty shells are often coloured dark brown to black) and shows shallow concentric striae of growt
A common feature of the shells of mussels is an asymmetrical shell which has a thick, adherent periostracum. The animals attach themselves to a solid substrate using a byssus . A 2020 study of the phylogeny of Mytilidae recovered two main clades derived from an epifaunal ancestor, with subsequent lineages shifting to other lifestyles, and ...
Mytilida is an order of marine bivalve molluscs, commonly known as true mussels. [1] There is one extant superfamily, the Mytiloidea , with a single extant family, the Mytilidae . Species in the order Mytilida are found worldwide, but they are more abundant in colder seas, where they often form uninterrupted beds on rocky shores in the ...
The mussels live in waters that are 11–32 °C (52–90 °F) with a wide-ranging salinity of about 18-33 ppt. [4] P. viridis grows fastest at 2 metres (2 yards) below the surface, in high salinity and a high concentration of phytoplankton , although it can tolerate a range of salinity and turbid water.