Top predator

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OP did not say 'live in water as a requirement'. Given this is a fish site. Top fish predator whale shark because of kill count - lot of dead plankton.

Everything goes extinct eventually
unprovable by definition by the way.
 
water bear, toughest animal period
1-078-water-bear-frontal.jpg

qualifies as it lives in water, and eats living orgainiasm so its a predator
[SIZE=+1]Water bears feed on the fluids of plant and animal cells. They have stylets which allow them to pierce plant cells or animal body walls. A sucking pharyngeal bulb enables them to then ingest the internal contents of their food items. Some species of water bears are known to eat entire live organisms, such as rotifers and other tardigrades. [/SIZE]
 
A predator is an animal that hunts and kills other organisms, usually for food.
we also need to look at the hunting part please. when you talk on predators its got to be a real predator. the world itself sounds fascinating. come on.we need some real water predators.i would say killer whale. even blue whale is not a match and is on their prey list
 
Lol, I was gonna say bacteria...

But I gotta say, the modern day predator of choice would be the Aussie salt water crocodile.
 
Cerbios;3125082; said:
OP did not say 'live in water as a requirement'.

I would assume that would go without saying. It was posted in General aquaria.

unprovable by definition by the way.
Most species don't live for more then a few million years. The oldest we have are horseshoe crabs and brachiopods (Lingula genus) but nothing lasts forever.
 
People, seriously, i said from ANY ERA!!!!!!!!
Liopleurodon rocks- =D
 
Umm, well IMO, from this era, I'd be afraid of snakeheads in rivers. From any era though, I'd probably say a hive of hornets are pretty efficient killers. Have you seen the video where they wipe out an entire colony of bees? its pretty intense. Like 8 hornets just rip the heads off of a huge ass colony of bees. I'd be scared to go near a hornet's nest.
 
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