According to a quick search, Viking Energy apparently will have a 220 cubic meter tank, which would equate to 220000 liters of ammonia. In aquaculture apparentl

According to a quick search, Viking Energy apparently will have a 220 cubic meter tank, which would equate to 220000 liters of ammonia. In aquaculture apparently ammonia reaches an almost universally high damage/lethal combination for fish (mammals can handle significant amounts thanks to a specific enzyme to handle build up the blood, fish have to just excrete it fast enough) and other non-mammals at around 2mg/L. Assuming all 220000 L of ammonia went 100% into the water and dissolved completely times 0.769 kg/m^3 density at STP, it'd be at the lethal level when dissolved in less than 84590000 liters of water, which equates to a cube approximately 44 meters per side or a sphere with a radius of 27 meters. Even with a 10x margin (since apparently some organisms can suffer damage even if not death from 0.2mg/L) that's nothing for an ocean going ship in general. So at least at first glance to me that looks very favorable vs the bunker fuel ships normally use, which is also horribly toxic but also floats and is much harder for creatures to get rid of.