Here's what we can say:
* Some freshwater eels are very small. The smallest species, like the dwarf swamp eel, only reach about 10-15 centimeters in length.
* Other freshwater eels are much larger. The European eel, for example, can grow to over 1 meter (3.3 feet) in length, and some can even reach 1.5 meters (5 feet)!
* The size of a freshwater eel depends on several factors, including its species, age, diet, and living conditions.
To get a more accurate answer, you'd need to specify which species of freshwater eel you're interested in.