The tessellated darter is a small, sprightly relative of the yellow perch whose rapid movement along stream bottoms gives it its common name. It is a frequent find in the tributaries of the Chesapeake Bay.
The tessellated darter has a slender, olive-colored body two to four inches long. Its sides are irregularly marked with eight or more X- or Y-shaped blotches. It has a short snout and eyes set close together on the top of its low head. It has two dorsal fins, the first arched with eight to 10 spines and the second higher than the first. Its dorsal, caudal and pectoral fins spotted and barred with black, and the pelvic and anal fins are black on breeding males.
The tessellated darter is found in both fast-flowing and quiet, standing waters, often on sand or mud bottoms or under rocks or pebbles.
This fish is found from St. Lawrence Seaway west to Lake Ontario and south to Florida, and it is common in all tributaries of the Chesapeake Bay.
The tessellated darter jerks quickly along stream bottoms from one spot to the next in search of food. This rapid movement gives the fish its common name. It feeds on small crustaceans, insects and insect larvae, snails and algae.
Preyed upon by large fish, turtles and fish-eating birds like kingfishers or herons.
Spawning occurs in spring. Adhesive eggs are deposited on underside and side of rocks, logs, shells or other debris. The female abandons the nest and the male remains to guard and aerate eggs, fanning the water with his tail or swimming over the eggs and brushing them with his pectoral fins. One male nests under a single stone, unless a scarcity of nesting sites forces males to share. Hatching takes place after about 21 days. The tessellated darter can exceed three years of age.