There are 23 species of sturgeons, all found in the northern hemisphere. They are mostly found in large, freshwater lakes and rivers but some species also travel to the ocean and return to rivers and lakes to breed. Sturgeons can grow to be very large, up to 4.2 meters. Sturgeons have rows of large, bony scutes on their bodies. Their mouths are positioned ventrally and have 4 barbels. All sturgeon species have been extensively used by humans for their meat and their roe. As a result, all sturgeon species are either threatened or endangered.
Tanya Dewey (author), Animal Diversity Web.
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
uses smells or other chemicals to communicate
having the capacity to move from one place to another.
specialized for swimming
uses touch to communicate