What about all the large cats like rtc, tsn ect. that live in deep river basins? It is really dark down there but I don't know about murky. It's not like some still water swamp. And yes a lot of cats live in muddy water and thats why a lot of them have barbels, thus giving them no real need for good eyesight. Thus why they come out at night while many other fish are sleeping, and they can just slowly find them and then pick them off...jhutch;843853; said:Actually the main reason for barbels is how cloudy the water is so they can feel around for food. The more barbels a catfish species has generally means how murky the environment is that they come from.