The Pfizer/BioNTech Vaccine used in the Covid Pandemic had to be stored and distributed at -70°C meaning that large amounts of dry ice were needed to support the Cold Chain it used to reach its point of use.
The storage temperature for most vaccines is higher than -70ºC but the method of packing and finding the right amount of dry ice needed is much the same regardless of whether frozen fish or high tech vaccine is being transported.