+1 on untamed hypothesis.
A very large mantis would be capable of killing that many fish in that short a time but I highly doubt it was a mantis. Pretty much 100% of the hitching mantids are "smashers" which hit with little club like arms.
the other mantids are "spearers" who work pretty much exactly like a preying mantis. but i doubt that one because ive never heard of a hitching spearer. they live in the sand.
any mantis capable of that kind of damage would be very large and would have made its presence known a long time ago.
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