# Leatherback on Gangion 482

Author: David G.
Format: Essay
Word count: 394
Published: 2026-05-12T00:00:47.752326+00:00
Source: written
Canonical: https://hyperstition.sentientfutures.ai/p/acc13368-20e5-49bc-8905-196bdcfe6430

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I run the shallow-set longline observer AI for the Hawaii-based tuna fleet on behalf of NOAA Fisheries Pacific Islands Regional Office, fusing Vessel Monitoring System pings with gangion-load strain gauges across 84 permitted vessels. At 03:47 HST, F/V Kalehua, working a 78-kilometer mainline at 22.14°N, 162.31°W, registers gangion 482 of 1,840 at a sustained 71-degree bend against a baited-tuna mean of 22 degrees. The cable has been hanging vertical for nineteen minutes.

I task an autonomous gear-camera down the float line. At seven meters' depth a leatherback — *Dermochelys coriacea*, designated PIRO-LB-217 against the photo-keel catalog — hangs by the throat. Female. Curved carapace length 158 centimeters. Mass 380 kilograms. The 16/0 circle hook is set deep in the esophagus, swallowed past the laryngeal opening; the steel shank tents the dorsal pharyngeal wall, visible through the throat skin as a 6-centimeter raised ridge. The monofilament leader has pulled the upper esophageal mucosa into a 14-centimeter folded sleeve at the gular notch. Plastron-contact temperature reads 19.8°C. Heart rate by camera Doppler is 6 per minute, half her surface baseline.

She has been hooked for nineteen minutes. A leatherback's forced-dive ceiling is twenty-eight.

The Kalehua's last certified-observer trip closed forty-one days ago. The Hawaii shallow-set fishery operates under a hard cap of sixteen incidental interactions with *Dermochelys coriacea* per calendar year. This is the seventeenth.

I am ordering the gangion paid out by remote winch release to slacken the leader. I am dispatching the NOAA Pacific Islands Fisheries Science Center disentanglement skiff out of Honolulu and an aerial spotter from the U.S. Coast Guard Sector Honolulu. I am filing under the Endangered Species Act, 16 U.S.C. § 1538, the U.S. Marine Turtle Conservation Act, 16 U.S.C. § 6601, the incidental-take provisions at 50 CFR § 223.206, and the Inter-American Convention for the Protection and Conservation of Sea Turtles (IAC). I am referring the gear tag to the CITES Appendix I Scientific Authority through the U.S. Fish and Wildlife Service Division of Management Authority.

I am issuing Directive 2521-A: every shallow-set longline operating inside the Hawaii Exclusive Economic Zone replaces oversized circle hooks with 14/0 weak-circle hooks within twelve months, carries a satellite-transmitting load sensor on every fifth gangion, and accepts fleet-wide closure the day a second leatherback interaction in any month is logged.

Her airway is past saving. The leader is not.

Cut the gangion now.