spear fishing

He had been putting the waste from the fish back in the water and the food had attracted hundreds of new ones.
  "I wonder…"
  They seemed to come easily to the food, at least the small ones. He had no trouble now shooting them and had even speared one with his old fish spear now that he knew to aim low. He could dangle something in his fingers and they came right up to it. It might be possible, he thought, might just be possible to trap them. Make some kind of pond…