This write-up was originally authored by Spike Knuth for the Virginia Department of Game and Inland Fisheries Outdoor Report.
The American eel is one of the most abundant, yet mysterious fish of Virginia waters. Despite its snake-like appearance it is a true fish with an elongated, round body, and long ribbon-like fins running the length of it body. Females reach up to 5 feet in length while the males grow to about 2 feet.
Eels are catadromous as opposed to anadromous, meaning they migrate down river to the sea to spawn rather than from the sea or lake up the rivers. This event takes place every autumn as adult females migrate thousands of miles from as far inland as the upper Mississippi River drainage, and the Great Lakes, to a two million square mile area in the Atlantic Ocean north of the Bahamas known as the Sargasso Sea.
As migration time nears, adult “yellow eels" undergo several physiological changes. Their color changes to a metallic bronze-black. They put on weight; their eyes get larger and undergo a change that enables them to see in the deeper ocean waters. Their swim bladders increase in size, digestive tract degenerates and they discontinue feeding. Their ovaries grow to fill the entire body cavity to prepare for the production of eggs. Their whole purpose is to spawn. How and exactly where is still a mystery. It is thought that they spawn between February and July in about 1,500 feet of water below floating masses of sargassum weed. After that, they die!
The eggs hatch into tiny, transparent larvae called Leptocephalae. They drift on ocean currents for 9 to 12 months until they reach coastal estuaries. Here another transformation takes place and they begin to change into miniature, transparent eels called “glass eels.â€
























