the most aggeresive fish

the only problem you have there is Orcas are not fish.
 
malawi eye biters the name say's it all and they look cool with the stream line torpedo look and the red strip across it back thats my vote could i also suggest a green terror
 
malawi eye biters the name say's it all and they look cool with the stream line torpedo look and the red strip across it back thats my vote could i also suggest a green terror

D. compressiceps are not particularly vicious though, I'd look into emperor cichlids or buttis when it comes to Africans.
 
i would have to go with the common old north amarican blue gill , im a fisherman i do aot of catfishing and use them for bate , the pump on my tank in my truck whent down and i wasent going to go fishing for about 3 more day's so i thought why not just stick a few in each of my decrotive tank's inside , i have 3 , an 125 gal.oscr / jack a 55gal. mbuna african and a 20 gal tropical community. i did not stick any in the community tank they would eat all my guppy's and mollys, but i did stick about 6 in each of the other tank's . the next morning i got a suprise in the oscr tank i had 1 badly beat up 7 " oscor and 2 dead JD's a few of the blue gill's had some niped fin's and missing scales, in the african tank i had 9 dead africans of varying types 3 dead blue gills 3 varymuch alive blue gills and 3 M auratus, crowded into 1 small cup i had in the tank to provide cave like areas for them
 
Keep in mind we are in the cichlid forum. Many of the species listed are not cichlids!
 
I'll say it again ; melanochromis auratus / pseudotropheus demasoni are, pound for pound, the nastiest little buggers out there imo, in terms of constant, unremitting aggression.
 
While not the most aggressive species around, the most aggressive cichild(s) I currently own are metriaclima sp. msobo.

I 'started out' with 6 (2m/4f) and kept them with a large group of pseudotropheus demasoni and pseudotropheus socolofi. As soon as maturity was attained the alpha female msobo (surprisingly) developed a low tolerance toward the other female msobos. In a single day day she killed one female, and was in the process of finishing off the other two (unfortunately a 2nd beaten female also succumbed to her wounds the next day). The males were 'non-players' in this aggression.

This female (female #1) and the battered surviving female (female #2) tenuously co-existed for awhile, until about a month later female #2 spontaneously attempted to eliminate female #1 (mouthbrooding at this point). Female #1 lost her eggs and nearly died. I placed her in a QT tank which contained a yellow lab and a catfish.

Even while seriously battered (to the extent where I wasn't sure she was going to make it), 24hrs later female #1 killed the yellow lab and was attempting to eliminate the catfish. I removed the catfish and had the msobo in that solitary tank for maybe a month to cool off and recuperate. I eventually placed her back into main tank (I needed the the QT tank for something else).The two females attacked each other on sight. By the time I separated them, both were in bad shape and had lost their caudal fins in the skirmish. They were intent on fighting it out to the end. Female #2 was on the losing end of the stick (despite an apparent 'home team advantage'). All out of extra tanks I was forced to place Female #2 in a grow out tank, where she's been ever since, though I was initially worried because she was definately large enough to eat many of the juvies in that tank.

Female #1 and Female #2 (now permanently separated) have been fairly docile ever since. End of story? Not quite. :headshake2: The female vs. female situation totally disrupted my msobo gender ratio. I went from 2 males/4 females to 2 males/1 female. It wasn't long before Male #1 sensed the 75gal tank was too small for two males. I came home one day and found Male #2 beat up (but nothing like how it was with the females). I netted him out and placed him in the grow out with female #2. Interestingly, I haven't observed any male vs female aggression (at least not yet).

End of story? Not yet. :headshake2:
Female #1 is now mouthbrooding again. I'm undecided whether or not to retain the fry (with the goal of increasing my msobo population to 1-2 males/8-10 females in one tank for them to be more manageable; they're kind of rare in my area so I can't buy more); or let the fry fend for themselves (where they'll likely all be eaten by the other fish).

I've never seen such intense female vs female aggression with any other mbuna species before.

Female #1 (mouthbrooding)
msobo_holding.jpg


Male #1
msobo1aug07.jpg
 
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This is easy hands down a Dovii. They attack anything and everything. Will charge a tank to get at your dog or even you.
 
yeah, I agree with all who said the Dovii... I have 3 of em. I also have to add to Coler's comment about the M. Auratus... I have 15 of those and they do constently be chasing one another and whatever else is in the tank with them.
 
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