Well, not exactly tanks, but definitely aquaculture...
A few days ago I finally had the right combination of tide, time, and temperature to venture down to the beach to assess the impact of the late-June heat wave on my oyster beds. I'd been putting this off, fearing the worst, but the news wasn't all that bad. Pretty surprising really, given the potentially lethal combination of record-setting heat and extreme low tides.
I emptied two bags (~100 oysters each) of the 2018 crop, and found only 2 and 3 empty shells, respectively, so mortality in this crop was <5%. I didn't score the 2019 crop, by by visual inspection these bags seemed similar to those from 2018. There was more mortality in the 2020 crop, which are still relatively small, which I estimate to be 20-30%. I then walked over to my neighbor's beach and looked at her bags, which were just put out with seed a few weeks ago. I didn't dump them out, obviously, but by inspection I would say that mortality in the little oyster seeds was at least 50%, perhaps as high as 75%. Not very surprising that the smaller oysters were the most adversely affected.
I will be putting out the oyster seeds for my 2021 crop in about 10 days, a double batch for this year, approximately 800 oysters. You can never have too many shellfish!