"Crassostrea bilineata , commonly called the Indian backwater oyster, is a commercially important oyster found along the west and east coasts of India."
"Shell irregular in shape and covered by many foliaceous laminae. Adductor scar dark purple in colour. Valves white, glossy and smooth on inner surface and purple-black on inner margin."
"Brackish water species found colonising rocky, concrete surfaces as well as hard muddy bottoms of estuaries, backwaters, ports and harbours and only sporadically on the open coasts."
"Mainly feeds on Diatoms (Biddulphia, Rhizosolenia, Chaetoceros, Coscinodiscus, Pleurosigma and Navicula-Ceratium, Foraminifers, Peridinians, Dinophysis) and detritus."
"Parasites: Polychaetes, Polydora ciliata and Polydora armata. Predators: Crabs Scylla serrata and Thalamita crenata."
Life History and Behavior
"Normally unisexual, but change of sex has been observed with a fair number of individuals in a transitional hermaphroditic phase. Spawning bi-annual in most of its range. In India, usually between October-November, and again between March-April. Fertilisation external. Fertilised eggs spherical in shape and between 0.05-0.08mm in diameter."
Not evaluated by the IUCN Redlist.
Listed in CITES: No. Listed in Wildlife (Protection) Act: No
Relevance to Humans and Ecosystems
Fished for limited human consumption and pearl culture.