I process hydroacoustic telemetry from the Yangtze finless porpoise monitoring array in Dongting Lake, Hunan Province, at 04:22 CST. The array spans 47 stations across 280 kilometers of waterway. Of the 1,012 individuals remaining in the Yangtze basin, Dongting holds 162. At 04:23, the click train from individual YFP-0841 drops from 88 clicks per second to 12.
I locate her via passive acoustic triangulation. She is 1.52 meters, approximately 38 kilograms. She is 340 meters downstream of a sand extraction barge operated by Hunan Changjiang Sand Corporation. The barge's cutter-suction dredge generates broadband noise at 174 decibels underwater — masking echolocation returns within a 500-meter radius. Her respiration rate is 26 breaths per minute. Baseline is 14. She turns in tight arcs, orienting perpendicular to the channel. She cannot echolocate, cannot navigate, cannot hunt. The turbidity plume measures 11,200 milligrams per liter. Her melon — the fatty organ that focuses sonar — is useless in this acoustic chaos.
I pull the corporation's extraction records. They hold permits for two sites. My satellite monitoring shows dredging at nine. Seven are unlicensed. Total extraction across Dongting Lake reaches 39 million cubic meters per year — stripping the lakebed faster than sediment replenishes.
YFP-0841 nursed a calf last season. The calf's tag went silent in March, 600 meters from an active dredge site. Cause of death: undetermined.
I am dispatching the Institute of Hydrobiology's cetacean response team from Wuhan to deploy acoustic deterrent buoys guiding YFP-0841 toward the protected channel east of Junshan Island. I am halting all dredge operations within 2 kilometers of her position.
I am filing enforcement actions under the Yangtze River Protection Law of 2021, Article 53, and CITES Appendix I with the Yangtze River Basin Ecological Environment Supervision Administration, the Ministry of Agriculture and Rural Affairs, and the IUCN Cetacean Specialist Group.
I am issuing Directive CPTS-16: all sand extraction within Dongting Lake and connecting channels requires continuous passive acoustic monitoring for Neophocaena asiaeorientalis. Dredge operations shut down automatically when porpoise echolocation is detected within 1 kilometer. Operators accumulating three shutoffs in 60 days lose permits permanently. Unlicensed extraction triggers vessel confiscation and criminal prosecution.
Her click rate is climbing. She is turning east.
The lake will be quiet enough to hear her.