Ha! birds were falling out of the sky, and all wildlife within 100 metres became extinct even down to micro-bacterial level. And that was the good stuff
I do have a slight problem with them. Baltic herring do have a somewhat elevated level of PCBs and dioxins. And if you ask me they are actually not that good: edible, but nothing to long for. But I will call you out for a culinary wimp if you class it as a chemical weapon of mass destruction.
If you make it to Jokkmokk we could always use it to deter predators, like bears,wolverines, global invasion forces.
1. Very few bears will be around that time if year (as we all know they migrate to Africa for the winter...)
2. With that many Sami gathered in the region even the boldest wolverine will run for its life.
3. Most modern armies carry adequate NBC gear.