define the process of nutrition in polycheates
Answers
●Polychaetes as a class are robust and widespread, with species that live in the coldest ocean temperatures of the abyssal plain, to forms which tolerate the extremely high temperatures near hydrothermal vents.
●Polychaetes occur throughout the Earth's oceans at all depths, from forms that live as plankton near the surface, to a 2- to 3-cm specimen (still unclassified) observed by the robot ocean probe Nereus at the bottom of the Challenger Deep, the deepest known spot in the Earth's oceans.
●Only 168 species (less than 2% of all polychaetes) are known from fresh waters.
The Polychaeta, also known as the bristle worms or polychaetes, are a paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. As such, polychaetes are sometimes referred to as bristle worms. More than 10,000 species are described in this class. polychaetes are considered to have a well- balanced nutritional profile for use . The protein quality is defined by the amino acid composition relative to the consumers's requirement.
Polychaetes (bristleworms) are marine annelids with parapodia bearing numerous setae in distinct fascicles. The sex of most polychaetes are separate. The gametes produced in a few specialized segments are shed into the coelom and leave the body through the nephridia.