The yellow croaker can use a rock in its head to keep its balance.
The rocks are in the fish's inner ear called otoliths. The yellow croaker's otoliths are made up of calcium carbonate, and when you peel back the fish's head when eating yellow croaker, you'll find these two glistening white, irregular prismatic otoliths in the inner ear. The otoliths play a role in the fish's ability to maintain body balance. The otoliths press on the sensory cells and help the fish adjust its body and maintain balance.
Life habits:
Distribution range map wintering in the deep sea, migrating to the coast in the spring, spawning between March and June, dispersed offshore to solicit bait, mainly mysid shrimp, hairy shrimp, as well as small fish as food, and return to the deep sea in late fall. The small yellowtail has a planktonic benthic and swimming animal diet, food selectivity is small, mainly feeding on zooplankton, fish and shrimp, of which the zooplankton to copepods are mainly fish, mainly gobies, shrimp, shrimp, mysid shrimp,? The shrimp include the hairy shrimp, mysis shrimp, white shrimp and drum shrimp.
In the southern Yellow Sea, the northern waters of the East China Sea, the small yellowtail mainly feeds on swimming animals, but in different life periods (overwintering, spawning and baiting) feeding intensity is different, of which the overwintering period (January to March) feeding intensity is the weakest, spawning (April to May) in the middle of the baiting period (June to December) is the most vigorous.