Sentence:  The crews of the later ketches numbered nine; a master (who was often also owner), mate, <WSD>boardsman</WSD>, and under-boardsman, whose duties were to bait and shoot the lines, the haulers and backer-in, who coiled down and removed the stale bait, and the boy, who was also cook. 
Meaning of the word marked with <WSD> tags:  A sailor on a smack whose job is to bait and shoot the lines