Yes turtleking some sort of Esox species either pike or muskies.
Dudzy Eels grow to 30cm max 1st year maybe only 20 cm depends on enviroment, Bs hit 30 in the feeder/shrimp ponds no probs. Mate has one in a 6x2x2 had it since it was 100mm (bought legally) 5 years old 70 cm pretty cool, very tame, eats anything.
Live for a long time aged to 45 years, travel downstream and out to the coral sea somewhere, no one knows exactly to spawn then die. Larvae develop at sea then return to most likely natal stream as elvers and travel upstream, can surmount any obstacle even the highest dam wall as long as it is damp.