Just Wondering...

I've got some convicts that I'd put in that category. I'd consider going with piranha, but they're really quite skittish fish unless they're feeding.
 
lol you think a oscar is the most aggresive freshwater fish? oscar gets beat up from a jd.......id say more like true red terror dunno about the midas but im sure its way more aggresive then a oscar
 
For its size, I understand Exodon paradoxus, the Bucktooth tetra, is a pretty viscious little fish. They need to be kept in species tanks or they'll chew up their tankmates' fins, scales, and anything else they can get their teeth on.
 
i have herd "mangrove snapper" aka: red datnoid is meaner than anything, have never seen one so just a post..
knowy
 
Gambusia Affinis

The most destructive fish due to its aggressiveness has been Gambusia Affinis or the Mosquito fish. There are many articles written about this fish where it has driven other fish to extinction or near extinction due to its introduction to native habatates. This fish was been given the Nick name DAMNBUSIA because of this.
So the most aggressive fish? Yes, it can possibly be the Wolf fish or a snake head but pound for pound, these tiny guys have caused much larger problems in the natural world.


gambusia_affinis05-500.jpg



From the Gambusia Control page

Gambusia as a competitor with native species
Interspecific competition for resources may extend to predation, by gambusia, of eggs and larvae of endemic fishes and amphibians. Milton & Arthington (1982) and Courtenay & Meffe (1989) listed reports that implicated gambusia in the decline of various native fishes. In Australia, gambusia was suggested to be an imminent threat to red finned blue eye (Scaturiginichthys vermeilipinnis, Pseudomugilidae) and Edgbaston goby (Chlamydogobius squamigenus, Gobiidae) (Unmack & Brumley, 1991; Unmack, 1992; Wager, 1994, 1995; Wager & Unmack, in prep). They also negatively effect southern blue eye (Pseudomugil signifer) populations (Howe et al., 1997) and tadpoles (Morgan & Buttemer, 1997; Webb & Joss, 1997). Glover (1989) reported gambusia caused a decrease in desert goby (Chlamydogobius eremius) and spangled perch (Leiopotherapon unicolor, Terapontidae) populations inhabiting Clayton Bore in South Australia. Speculation that gambusia preyed on the eggs and larvae of rainbowfish (Melanotaeniidae) in the wild (Arthington & Lloyd, 1989; Arthington, 1991) was confirmed over summer 1997/98 in a field study in the upper Orara River, near Karangi, New South Wales (Ivantsoff & Aarn, 1999). In New Zealand, Barrier & Hicks (1994) showed that although gambusia was harassed by the larger black mudfish (Neochanna diversus, Galaxiidae), gambusia ate their larvae.

Many examples from North America demonstrate the negative effects of gambusia. Due in large part to predation, gambusia have eliminated Gila topminnow (Poecilliopsis o. occidentalis) from almost it's entire range. Populations only persist where gambusia are absent or in a few springs where other as yet unknown ecological characters allow them to coexist (Minckley et al. 1991). The other subspecies, the Yaqui topminnow (P. o. sonoriensis) is also in great danger as gambusia are only just starting to invade and spread throughout the Yaqui River system. Gambusia have a major impact on some pupfish (Cyprinodon spp.) populations. While no extinctions due to this have been recorded, coexisting populutions tend to be quite depressed in abundance. Evidence collected in part by Unmack (unpub. data) from Ash Meadows, Nevada suggests that when gambusia are decreased in abundance by physical removal, significantly higher numbers of pupfish occur within a year. Gambusia have also been demonstrated to cause extinction of California newt (Taricha torosa populations (Gamradt & Kats, 1996). Much to Diamond's amazement gambusia are freely given out to anyone who wants them in southern California. To directly quote Diamond (1996);
Click to expand...
 
I think the wolf fish would be the most aggressive...

No, a bullshark would be. :D... sharks ARE fish, and they DO live in freshwater, and if you're rich enough, sure, you could house one. :D
 
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