Organisms

The Yellow Sea has great biodiversity, being the single most important site for migratory birds on northward migration in the entire East Asia, with a minimum number of two million birds passing through at the time. It also has a huge diversity of fish, crustaceans and invertebrates, and some types of whales and other mammals.

Fish:

Eepouts - many species, like Lycodes reticulatus
Anchovy - Engraulis japonicus
Cods - many species, like Gadus macrocephalus
Brill - Scophthalmus rhombus
Pacific Halibut - Hippoglossus stenolepis
Pacific Herring - Clupea pallasii
Yellow Croaker - Genyonemus seleani
Spotted Sardine - Escualosa thocatta
etc.

Mammals:

Orca - Orcinus orca
Minke Whale - Balaenoptera bonaerensis
Finless Porpoise - Neophocaena phocaeniodes
Seal - Zalophus japonicu
Blue Whale - Balaenoptera musculus
Sei Whale - Balaenoptera borealis
Fin Whale - Balaenoptera physalus

Birds:

Black-tailed Godwit - Limosa limosa
Bar-tailed Godwit - Limosa lapponica
Little Curlew - Numenius minutus
Whimbrel - Numenius phaeopus
Spotted Redshank - Tringa erythropus
Marsh Sandpiper - Tringa stagnatilis
Grey-tailed Tattler - Heteroscelus brevipes
Sanderling - Calidris alba
Red Knot - Calidris canutus
Oriental plover - Charadrius veredus
etc.

Crustaceans:

Fleshy Prawn - Penaeus milicopes

Japanese Shrimp
Reef Lobsters - Enoplometopus
Crabs - many species, like the Japanese Spider Crab (Macrocheira kaempferi)

Mollusks:

150 different species of mussels, clams, oysters and scallops;
Chambered Nautilus (Nautilus pompilius)
Common Cuttlefish (Sepia officinalis)
Common Octopus (Octopus vulgaris)

Invertebrates:

Sea Sponges, anemones and Sea Cucumbers;
The dominant phytoplankton species are Skeletonema costatum, Coscinodiscus, Melosira sulcata, and Chaetoceros. The dominant zooplankton species are Sagitta crassa, Calanus sinicus, Euphausia pacifica, and Themisto gracilipes.