The creatures disgorge the stuff in big, ugly lardy blocks ranging from brick size to Air/Raft size. They do this just after every mating season, and there are two mating seasons a year. Why they do this is anybody's guess
It's actually food for a symbiotic bacterial-analogue species the scientists hadn't yet identified, which uses the material for larval colonies a month or so later. Of course, thanks to the mass harvesting activities, the bulk of this generation is going to starve before they go back into the seas at maturity.
Which means that three or four months down the line their symbiotic pair will find the bacterial bloom they count on to feed their newborn young won't materialize. At the point at which their corpses start washing up, the players may get worried. Of course, it's an easily fixable problem - commercial anagathics dissolved in common-or-garden gelatin make a more than adequate substitute. But buying anagathics in bulk to leave them on the beach for bacteria jell-o is going to be a difficult one to sell to the loans company....