I would be interested in this too as your qual and yrs experience matches mine, also in biology/biotechnology.
Just a guess but I would say the salaries are before tax, and from what little I understand, science isn't really the sort of field that pays bonuses (unfortunately). At least not in HK where I'm also looking.
But I could be wrong...
I must say I haven't been all that impressed with salary ranges in I've seen so far in bio science. But, hey, we can only try