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Plankton nets draw the animals into a large open ring and funnel them into a jarlike device called a cod end.

The closed end, or “cod” end, of the net stretched down into the sea behind them.

There, the cod end swings like a bulging coin purse until William, a long pole in his hand, undoes the knot, and the prawns crash to the metal floor.

Start with “one-pot baked Alaskan cod,” end with “sautéed pike with roasted cauliflower, capers, olives and currants.”

The first bottom trawls were 20-foot nets weighted by stones and lead in the closed "cod" end.