http://books.google.co.uk/books?id=2BcqAAAAYAAJ&pg=PA97&lpg=...

see reference to fisherman as “extractores primarios”
http://www41.statcan.gc.ca/2006/1664/ceb1664_000-eng.htm
Primary industries are those that harvest or extract raw material from nature, such as agriculture, oil and gas extraction, logging and forestry, mining, fishing, and trapping. Together, agriculture and the extraction of oil and gas contributed 3.5% to Canada’s total economic output in 2004, while the remaining primary industries delivered 2.6%.

https://en.wikipedia.org/wiki/Economic_sector
The classical breakdown of all economic sectors follows:[1]
• Primary: Involves the retrieval and production of raw materials, such as corn, coal, wood and iron. (A coal miner and a fisherman would be workers in the primary sector.)


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Educated Service Workers Are Concentrated in Canadian Cities ...
martinprosperity.org/.../educated-service-workers-are-concentrated-in-ca...‎
Jun 1, 2011 – Finally, farmers, fishers, and other primary extractors are paid to extract ... of occupations in the service sector (e.g. food service workers, janitors, ... class, 4.6% are in the working class, and less than 1% are in the fishing, ...

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Remapping Asian American history - Page 59 - Google Books Result
books.google.co.uk/books?isbn=0759104808
Shehong Chen - 2003 - History
Furthermore, instead of separating those in agriculture from those in fishing and ... fishermen, and miners together as primary producers and extractors (i.e., ...

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so

nothing wrong with "primary extractors/primary resource extractors"

http://books.google.co.uk/books?id=L95ICsAoFIYC&pg=PA119&lpg...

I would avoid "initial".

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download - MIT Sea Grant College Program
seagrant.mit.edu/publications/MITSG_01-15.pdf
by M Hall-Arber - Cited by 46 - Related articles
primary livelihood engenders relationships of dependence between the extractors (e.g. fishermen) and their support networks. Significant changes in access to ...