The lack of a species of giant eel being known to science is against that possibility, as opposed to rare mutant eels that grow to giant size, which are known to science. Then again, the the murky deeps of the oceans and large fresh water lakes continue to hold mysteries. Like you, I surmise, I hope that there is a species of giant eel yet to be discovered.
...as opposed to rare mutant eels that grow to giant size, which are known to science.
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I have to ask: Just how big are these mutant eels known to grow?