Guys I've been diving (mostly free-diving), spearfishing and all sort of water activities since ages here.... and I only saw 2 sharks in my life here: 1black tip and 1 bull shark (quite a large one).... the blacktip was on the west coast of Qatar (and at around 700m offshore) and the bullshark was at around 2.4km offshore at the entrance to the inland sea (at some reef in that area) and in both cases i was diving alone... other than that I with my group have dived around oilrigs, wrecks and as far as 140km offshore and never ever got into any situations with any shark or whatsoever (and we have dive logs by the hundreds)... however we got some sharks by line while trolling (but that's at places such as oilrig and halool island which are quite far offshore....)

 

So dont worry about sharks, as u have at least 10,000x more time being hit by a reckless driver on ur way to the beach than being bitten by a shark..

 

as for shark species in Qatar: then u have blacktips reef sharks, bronze whaler, great hammerhead, scalloped hammerhead, bull shark, spotted shark, hardnose shark, and tiger shark. Of those, only bull sharks and tiger sharks are known for their aggressivity, and there has never been any fatality (worldwide) with a great hammerhead but due to its large size it should be respected....

 

and about the guy killed by shark in doha: CRAP x CRAP (never happened)...

 

i hope that was useful.