@jojee2k6 also see over here. However, this appears under temporary workers. I think your postdoc fellowship would need to be a permanent job offer with LMIA in order to qualify for the 50 extra points
http://www.cic.gc.ca/english/resources/tools/temp/work/opinion/policy.asp
Post-doctoral fellows awarded a Doctorate of Philosophy (Ph.D.) and research award recipients [C44]
Note: There are two categories of workers captured under C44: post-doctoral fellows awarded a Doctorate of Philosophy and award recipients.
Post-doctoral fellows holding a Ph.D. or its equivalent
Foreign nationals in this category may be appointed to a time-limited position granting a stipend or a salary to compensate for periods of teaching, advanced study and/or research. It is work designed to obtain the highest expertise possible in a particular discipline, and candidates are chosen on the basis of academic excellence.
The applicant must have completed, or be expecting to complete shortly, their doctorate and be working in a field related to that in which they earned, or are earning, their Ph.D.
Post-doctoral fellows can either be the direct recipients of an award or be offered a time-limited position to undertake research on behalf of or as part of a team of researchers. Universities vary in their methods and criteria used in assessing candidates and offering post-doctoral fellowships. Officers should assess the written offer from a responsible academic official (professor or higher), which will state the amount of remuneration and the location, nature and expected duration of the term of employment.
Occupational code
For post-doctoral fellows who are employed by a Canadian university or educational institution, the 2011 NOC code should be 4011.
For post-doctoral fellows who are employed by a Canadian entity that is not an educational institution, their field of specialty should be used. For example, a geologist with a doctorate may work as a geologist and not as a post-doctoral fellow, in which case the 2011 NOC code would be 2113.