Sentence:  The conflict between gill-<WSD>netters</WSD> and cast-<WSD>netters</WSD> has existed at least since the 1940s. The conflict is about resource allocation since gill-<WSD>netters</WSD>, who are only a few in number, capture much more resources with less human effort than the large majority of fishers who use cast nets. 
Meaning of the word marked with <WSD> tags:  One who nets (in any sense), or who uses a net.