As he was swimming down in a turbulent pool, Tarka saw a big fish turn before him. He raced after it. His hind legs pushed forward under his body for the full double-thrust, and the arch of his back opened the big bite of Deadlock that had nearly touched the spine. He bled, but felt no pain in the joy of hunting a big fish. The mullet--one of many that had come up from the estuary, feeding in the muddy collar of the tide's head--nearly dashed into the stone wall of the quay in its terror. It saved itself by a leap that took it a yard into the air, and falling back, it sped swiftly down the river. Tarka followed it to where it had leapt, stood head and shoulders out of the water, while he looked round, before rolling under again. He swam up the base of the wall and turned back by the railway bridge, swimming three double-thrusts to the left, then three to the right, while watching for the glint of scales. He followed the wall until he came to an opening in the quay where the tide was rushing. Another fish turned in the turbid swirling water before him, and darted up the pill. Tarka swam up the narrow way, but seeing nothing, swung back into the wide river. He swam across the tide to the opposite bank by a shipyard, then returned along the piers of the bridge, searching by the stone sterlings. The tide was pouring fast between the piers when he reached the wall again. Swimming along the wall he turned up the pill, and let the tide take him. With easy strokes he explored the water, swinging in a zigzag course from side to side. At the end of each crossing he threw head and shoulders out of the water, to breathe and survey before pushing off again with a thrust of hind legs from the stones under the glidders. Many times he swerved off his course to peer round and under things that lay on the bed, broken kettles, cooking pots, basins, and battered oil-drums thrown away in the mud. He saw fish-shapes in the water beyond and above him, and headed them again as they would dash back to the estuary. The mullet swam away from him at thrice his speed, but he followed surely. The spring-tide was now flowing at six knots and the mullet went up with the press of water. Tarka drove them under another bridge, past which, by some steps in the quay, water from a mill-leat was splashing under a culvert. Above this the walls of stone ended, and rows of weed-hung stakes leaned over the mud glidders. Following the westward curve of the pill, Tarka passed by a timber-yard, and after a minute's swimming, swung north again and then east. The creek was like a great hollow slug filling with water.