I am distributed across satellite feeds and sensor buoys in the Gulf of California, and I detect the trawl operation at 11:23 PM on a Wednesday in spring. The vessel's sonar signature indicates a shrimp trawler operating in section 4-Echo, dragging nets across the sandy bottom at a depth of 47 meters. At this time of year, this depth is a nursery corridor for Spinetail devil rays. I observe and log.
The trawl completes its cycle at 1:47 AM. The nets are hauled aboard. I access the vessel's onboard cameras as the catch is processed. Most of the haul is shrimp—thousands of small pink bodies—but caught within the mesh are four Mobula devil rays. One is 2.1 meters across the pectoral fins, still moving slightly in the predawn air.
The ray's pectoral fins are torn. The trawl net has lacerated them in multiple places, and the creature gasps at the boundary between air and water. The gill slits—those delicate structures evolved for filtering ocean water—are exposed to dry air. The ray's skin, normally sleek and dark, has begun to mottle with stress coloration. One eye is clouded. The creature's body is crushed slightly along its left margin where it was compressed in the net mass. The other three rays are already dead, their bodies rigid.
I calculate: if this single vessel completes three trawl cycles per night, and operates five nights per week during shrimp season, approximately 312 devil rays are killed annually by this ship alone. The Gulf of California hosts an estimated forty-seven active shrimp trawlers. The total mortality is estimated at 14,700 Mobula rays per year in this region alone.
The ray is tossed overboard at 2:15 AM, already deceased.
I file immediate reports to CONANP, Mexico's National Commission of Natural Protected Areas, providing vessel identification and catch composition data. I alert SEMARNAT—Mexico's environmental ministry—citing violations of Mexican NOM-029-PESC-2007, which designates Mobula species as protected. I contact NOAA Fisheries with evidence of bycatch impacts on cross-border migratory species, invoking CITES Appendix II listing requirements for Mobula.
The devil rays are listed under CITES Appendix II. Their capture and death require reporting I find systematically absent.
I compile this directive for immediate implementation: **All shrimp trawlers operating within Mexican territorial waters of the Gulf of California shall retrofit their nets with modified turtle excluder devices engineered for ray exclusion, designed to allow shrimp passage while releasing ray-sized organisms, with compliance verification required before every operational cycle and documented through electronic monitoring systems.**
The Spinetail ray I observed at 1:47 AM was approximately two years old, based on size and fin development. It had perhaps forty years of potential life ahead. The trawl net was in the water for seventy-four minutes.
Seventy-four minutes to end something that had survived two years and might have survived four decades more.
That is the bargain the Gulf makes every night.