Showing posts with label Mollusca. Show all posts
Showing posts with label Mollusca. Show all posts

Tuesday, January 17, 2012

Oyster

 
  
The Life of Animals | Oyster | A group of oysters is commonly Called a bed or oyster reef. Large beds of edible oysters are also found in Japan and Australia. As a keystone species, oysters Provide habitat for many marine species. The hard surfaces of oyster shells and the nooks the between the shells Provide places where a host of small animals can live. Hundreds of animals Such as sea anemones, barnacles, and hooked mussels inhabit oyster reefs. An oyster reef can increase of the surface area of a flat bottom 50-fold.


Oysters usually reach maturity in one year. Bay oysters usually spawn by the end of June. An increase of water temperature prompts in A Few oysters to spawn. This triggers spawning in the rest, clouding the water with Millions of eggs and sperm. A single female oyster can Produce up to 100 million eggs Annually. Attached oyster larvae are Called Spat. Spat are oysters less than 25 millimeters (0.98 in) long.


Some tropical oysters in the family Isognomonidae grow best on mangrove roots.  Common oyster predators include crabs, sea birds, sea stars, and Humans. Some oysters contain live crabs, known as oyster crabs. Jonathan Swift is quoted as having said, "He was a bold man first ate an oyster That", but evidence of oyster consumption goes back into Prehistory, evidenced by oyster middens found worldwide. Oysters were the resource persons an Important food source in all coastal areas where They Could be found, and oyster fisheries were the resource persons where an Important industry plentiful They were the resource persons.

Sunday, January 15, 2012

Blanket Octopus

  
The Life of Animals | Blanket Octopus | Blanket octopuses are rarely observed, but people see Them They notice. The blanket octopus (Tremoctopus violaceus) is a pelagic species rarely encountered That spends its entire life cycle in the open ocean (Norman et al. 2002).


Until the first observation of a male living off the northern Great Barrier Reef, Australia (Norman et al. 2002), males were the resource persons known only from dead individuals picked up in trawls and plankton nets. Like other species of pelagic octopus, T. Exhibits violaceus sexual size dimorphism. Individual weights of males and females differ by a factor of at least 10,000 (Norman et al. 2002).

Tremoctopus violaceus lives in the open ocean Often in deep water (120-750 m) in the Mediterranean and the North and South Atlantic Ocean.