Shellfisher

The shellfisher's object is to intercept these and drag them back in his net before a new breaker scatters them up the beach again.

Source: wiktionary

Each shellfisher benefits from the hot water whether he or she pays or not. Thus if other shellfishers pay for the hot water, there is no need for an individual shellfisher to do so. Once the temperature of the river is up for one shellfisher, it has increased for all. Anyone of them can act as a free rider, relying on others to pay for the warm water.

Source: wiktionary

If Nautilus of Greek mythology had been a shellfisher, it would be clear how the exercise equipment got its name.

Source: wiktionary

After the tour I lingered on, and Jim and I talked a bit there by the waterway about the vagaries of being a shellfisher in the modern age.

Source: wiktionary