Fugora fish
From Tardis Wiki, the free Doctor Who reference
Fugora fish was a type of fish that could be found in the seas of Megerra. It was one of the few forms of life that was able to survive that pollution caused by Mega City. (BNA: Mean Streets) The original population eventually went extinct. (NA: Shakedown)
The Fugora fish was regularly prepared and eaten in Mega City, and Fugora fish stew was the planet's speciality. (NA: Shakedown) Despite this, the Fugora fish was highly toxic and many people died from improperly prepared Fugora fish. (BNA: Mean Streets)