Per 
Special Containment Procedures: Production of SCP-XXXX instances are outlawed in the city of Shanghai, China. Governmental sanctions have been instated to outlaw hunting of instances of SCP-XXXX-1. Foundation web crawlers have been installed to flag down any mention of SCP-XXXX or SCP-XXXX-1, any publication of material of SCP-XXXX is to be falsified as a myth via disinformation campaigns.
An instance of SCP-XXXX.
Description: SCP-XXXX is a recipe known as shark fin soup, which manifests anomalous properties when produced from sharks within the Shanghai region. Selachians within those areas, now designated SCP-XXXX-1 biologically show no difference to normal sharks other than the presence of lungs. The anomalous property of SCP-XXXX is that upon consumption the subject will become a species of selachian with varying results. Upon taking on the new form, the newly transformed subject will find its way to a body of water via currently unknown means. A small amount of cases have shown the individuals to move their fins in a way similar to walking. Testing has been preemptively denied via the Site Director Jorge Clark as the effects of SCP-XXXX are well documented and apparent.
Discovery: SCP-XXXX was discovered when several families went missing in Shanghai followed by several reports of walking sharks online. Witnesses to instances of SCP-XXXX-1 were promptly amnesized and returned. Currently as of 06/07/2019, there is an estimated count of 452 instances of SCP-XXXX-1, making them an endangered species.
Notes: On 04/29/2019, Foundation web crawlers flagged an advertisement. a transcription of the advertisement is attached:
Shark Fin Soup, by residents of Shanghai!
A soup made for slurping!
Partake in a delicacy, by our finest producers.
Our soup is healthy to consume!
Remember: Slurp, Partake, Consume.
Keep punching!
Happy hunting!
The advertisement was immediately taken down upon flagging. Memetic agents were found, however, a source has yet to be identified.
Addenda-SCP-XXXX.1: Following reports of a man punching a shark, Foundation Marine Biologist Kevin Drant and a team of Marine specialists were dispatched to the location, a shipwreck off the coast of Nanjing, Shanghai, China. Kevin's team noted that the following messages attached were crudely scratched into the ships hull.
ples stop eat
was homan
i scared
sory mom
i wana go hom
i mis you
why
why am fish
plis help
ow
got punch ed
it hurt
The final message was found similarly, crudely scratched into a secret back room of the ship.
i hide
stop hit me
i said stop hit me
Addenda-SCP-XXXX.2: On 05/02/19 a radio transmission was received by the Foundation. The location of the transmission was traced back to the previous shipwreck. The contents of the decrypted transmissions are held below:
<Begin Log Transmission SCP-XXXX.2>
Shark down… Pugilism successful.
Slurp. Partake. Consume.
<End Log>
Memetic agents were flagged and remove. A single selachian corpse was found in the shipwreck, with its dorsal fin severed.
