Deep Sea Shellfish
Shellfish is a gastronomic
and fisheries term for those marine invertebrate natural worlds
that are used as food: different species of molluscs, crustaceans,
and echinoderms. Even though the word is primarily used as a
term for marine species, freshwater edible invertebrates (such
as crayfish and river mussels etc) are also occasionally grouped
with the aquatic genus under the umbrella concept of "shellfish".
In its broadest definition, it also consists of such things
as edible land snails’ escargot, edible land crabs, etc.
Almost all shellfish have a hard external or exoskeleton, known
as a shell, hence the first part of the expression. The second
word section "fish", is here used in the antiquated
intellect, to mean an animal that lives its whole life in water.
However, these invertebrate animals are not "fish"
in the new sense of the word, and therefore the term finfish
or fin fish is sometimes used to distinguish ordinary fish from
decapods crustaceans of the infraorder Brachyura, which normally
have a very short projecting "tail"or where the condensed
abdomen is wholly hidden under the thorax. They are generally
sheltered with a thick exoskeleton, and armed with a single
pair of chelae (claws). 6,793 species are known. Crabs are found
in all of the world's oceans. Additionally, there are also many
freshwater and terrestrial crabs, particularly in tropical regions.
Crabs vary in size from the pea crab, only a few millimetres
wide, to the Japanese spider crab, with a leg span of up to
are decapods—ten-legged omnivores—but the front
pair of legs are specialized with enlarged claws, so they
are often described as eight-legged. Some species feed primarily
on algae, while others take any brand of food, including mollusks,
worms, other crustaceans, fungi, bacteria, and detritus, depending
on accessibility and on the variety of crab.
crawfish, or crawdads are freshwater crustaceans similar to
tiny lobsters, to which they are most likely closely interrelated.
They respire throughout noiseless gills and are start in bodies
of water that do not freeze up to the bottom; they are also
mostly create in brooks and streams where there is bright water
running, and which have shelter against predators. Most crayfish
cannot stomach grimy water, although some species such as the
invasive Procambarus clarkii are hardier. Some crayfish have
been found living as much as 3 m (10 feet) underground.
The body of a decapods crustacean, such as a crab, lobster,
or prawn, is made up of nineteen body segments grouped into
two main body parts, the cephalothorax and the abdomen. Each
segment may possess one pair of appendages, although in various
groups these may be reduced or missing. On average, crayfish
grow to 7.5 centimeters in length, but some grow larger.
are invertebrates and are originated all over the world. They
have a hard defensive exoskeleton. Like most arthropods, lobsters
must molt by regulate to grow, departure them susceptible during
this time. During the molting process, several species may experience
a change in color.
Lobsters live on rocky, sandy, or muddy bottoms from the
shoreline to beyond the edge of the continental shelf. They
normally live alone in crevices or in burrows under rocks.
eat live food, consisting of fish, mollusks, other crustaceans,
worms, and some plant life. Sporadically, they will scavenge
if necessary, and may resort to cannibalism in captivity;
however, this has not been observed in the wild. Lobster skin
in the stomachs of lobsters has been found before, although
this is because lobsters will eat their shack skin after molting.
Lobsters grow all through their lives and it is not abnormal
for a lobster to live for more than 100 years.
Prawn is also called
as Shrimp. Prawns are swimming, decapods crustaceans classified
in the infraorder Caridea, found widely around the world in
both fresh and salt water. Adult Prawns are filter feeding benthic
animals breathing close to the sea bottom. They can live in
schools and can swim rapidly backwards. Shrimp are an important
food source for larger animals from fish to whales. They have
a high struggle to toxins in dirty areas, and may supply to
high toxin levels in their predators. Together with prawns,
shrimp are widely trapped and farmed for human utilization.
A Prawn fish farm is an aquaculture business for the cultivation
of marine shrimp or prawns for human consumption. Commercial
shrimp farming began in the 1970s, and production grew steeply,
particularly to match the market hassle of the U.S., Japan and
Western Europe. The total global production of farmed shrimp
reached more than 1.6 million tonnes in 2003, instead of a value
of nearly 9,000 million U.S. dollars. About 75% of farmed shrimp
is fashioned in Asia, in fastidious in China and Thailand. The
other 25% is produced mainly in Latin America, where Brazil
is the largest producer. The largest exporting nation is Thailand.
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