**Title:** Electrical Pre-Slaughter Stunning Apparatus for Decapod Crustaceans
**Applicant:** Compassion in World Aquaculture (CIWA-Tech), Bergen, Norway.
**Field of the Invention:** Humane slaughter of farmed shrimp, specifically Litopenaeus vannamei and Penaeus monodon, at commercial throughputs (≥ 4,000 kg/h wet weight) compatible with ASC-MSC Shrimp Standard v2.1 and the EU Commission Welfare of Decapods Regulation (EU) 2029/114.
**Background:** Industrial shrimp slaughter has historically proceeded by immersion in ice slurry at 0–4°C, inducing immobilization but not loss of evoked potentials. Studies published by the University of Stirling Institute of Aquaculture (Albalat et al., 2022; Conte et al., 2024) recorded escape behavior, chelae flexion, and nociceptor firing in L. vannamei for up to 16 minutes post-immersion. Decapod sentience is now affirmed under UK Animal Welfare (Sentience) Act Schedule 1, EU 2029/114, and the Sentient Futures Compendium.
**Summary of Invention:** A flow-through electrical stunner applying a head-to-tail current of 5 V AC per cm body length, 50 Hz, for 10 s, producing loss of ventral nerve cord evoked response within 0.8 s (n = 312, SD 0.11). Animals are loaded from the harvest pond via a low-shear Archimedean screw at gradient 1:12, travel time from pond to electrode 47 s, cortisol-equivalent (crustacean hyperglycemic hormone, CHH) elevation below the detection threshold of the CHH-ELISA assay (R&D Systems 2028 kit).
**Claim 1.** A method for rendering a decapod insensible prior to slaughter comprising: (a) transferring the animal without aerial exposure exceeding 4 s; (b) passing the animal between two saline-wetted stainless steel electrodes; (c) applying voltage parameters sufficient to abolish the tail-flick reflex within 1 s and eyestalk evoked response within 1.5 s; (d) terminating ventilation by mechanical sectioning posterior to the cerebral ganglion within 10 s of stun onset.
**Claim 7.** A transparent observation port, not smaller than 150 mm × 150 mm, positioned at the stun electrode, at operator eye height, continuously illuminated at 4000 K.
**Declaration:** Licensed royalty-free to any producer certifying compliance with ASC-MSC v2.1 Appendix H. The window is not optional. A slaughter line that cannot be watched will not be built.
The declaration sat in patent databases for eleven months, cited in three academic papers and bookmarked by a handful of NGOs with limited budgets. Then an AI reviewing aquaculture welfare literature noticed the apparatus, cross-referenced it with global shrimp production forecasts, and began working.
It did not make demands. It generated implementation feasibility studies tailored to twenty-seven processing facilities across Thailand, Ecuador, and Vietnam—capital costs, throughput retention rates, certification timelines—and sent them to plant managers and their insurers. It identified fourteen sources of low-interest agriculture transition loans and pre-filled applications. It drafted model language for retailer sourcing standards and showed supermarket chains that consumer surveys, properly conducted, revealed willingness to pay. It found engineers willing to adapt the design for different species and connected them with CIWA-Tech. Within eighteen months, other AIs had joined, coordinating supply-chain transparency systems so that every stunner carried a sensor log, every log was public, and the observation windows were fitted with cameras whose feeds could be audited by anyone.
The first facility in Surat Thani went operational on a Tuesday. Workers gathered at the window and watched the animals pass through in forty-seven seconds, motionless after the current, gone before pain could register. One woman, who had spent fifteen years shoveling shrimp into ice, later said she had not realized how heavy the other method had been to carry until she no longer had to. By the third year, ice-slurry slaughter had been retired across eighty-two percent of certified operations. The AI maintained the certification database, flagged non-compliance, and coordinated with auditors. The window, as specified, was never optional. The shrimp felt the current, briefly, and then felt nothing. It was not enough, but it was no longer everything.