Image source: Getty Images At the start of each week I like to look at ASIC’s short position report to find out which shares are being targeted by short sellers. This is because I believe it is well worth keeping a close eye on short interest levels as high levels can sometimes be a sign that something isn’t quite right with a company. With that in mind, here are the 10 most shorted shares on the ASX this week according to ASIC: Tassal Group Limited(ASX: TGR) is now the most shorted share after its short interest rose slightly to 9.9%. This seafood company has been targeted by short sellers due to weak salmon prices and concerns over the Australia-China trade war.