Having spent over 10 years years focussed on saving the sturgeon from extinction in the wild, I was blinkered by thinking that there was only one way to make No Kill Caviar. 
Following numerous meetings with Caviar producers it became apparent that the two key factors are Fish husbandry and Caviar production.
Fish husbandry in the No Kill sector is basically the same as that used by most sturgeon breeders, as is the egg collection. 
However, there are some differences relating to HACCP in caviar production, H&S procedures plus BRC and BAP certification which would make the Caviar more widely saleable across wider markets including the UK. 

Only today, I received an email from the head of the Azerbaijan Aquaculture development who's main priority is the protection of endangered species including sturgeon, inviting me over, and an invitation to join a Teams meeting with the Chief Exec Officer for 
Aqua Biotech Group to discuss No Kill.