You could make a DTM of this shrimp and then use FindDTM(Shrimps, x, y, MIX1,MIY1,MIX2,MIY2) and it would return the coordinates of the Shrimp DTM as x and y.
If you need a good tutorial on making DTM's check out DTM Tutorial
This should tell you all you need to know.
Basically this would be your coding...
SCAR Code:
Shrimp:= DTMFromString('78DA639CC7C4C0A0CBC8800C1674D53370016' +
'990E87F2060ECC5540391859140BA1FA8C688809A2540352A04D4' +
'4C22AC0600F5400991');
if(FindDTM(Shrimp, x, y, MIX1, MIY1, MIX2, MIY2))then
begin
MMouse(x, y, 3, 3)
if(IsUpText('Use'))then Mouse(x, y, 3, 3,true);
end;