As quoted in MercoPress, the head of Uruguay’s Aquatic Resource Office said:
It's not a contamination incident but rather that the produce, when samples were taken before landing, howed levels above those specified as acceptable.That means the squid were bioaccumulating cadmium from their environment, which is a bit concerning when you think of all the fish that eat squid--and all the people who eat those fish.
I don't know what the source of the cadmium is, but it seems someone might want to look into this . . .