I doubt that there's anything associated with the history of the aquarium hobby that somebody somewhere does not collect.
@GaryE mentions shipping tins. Here's one. Over a century old. Photo sent to me by a collector a while back.
I hope we're not hijacking the thread. These aren't reminiscences, but to me, reports. I was extremely fortunate to have been one of those kids who always got along with people 60 or 70 years older than me. All the men and women I think of when I say that weren't telling old stories from rocking chairs - they were still active, sharp thinkers and the stories leaked out from explanations. One of the best friends I ever had was 40 years older than me, and became a third grandfather to my kids. You work on things with people, you listen, and you learn.
That tin box looks like a minnow pail adapted to a different function. You could fit several of those under a bunk or in a quiet place.
I asked my friend about fish mortality. He didn't see it as a huge issue, interestingly. Conditions in those pails must have been rough. To bring the thread back around, when you look at old aquarium literature, you see the toughest species. You see fish that could survive before heaters existed. It's questionable if they thrived, but they survived.
People were on it right away. My great grandfather was a baker by trade, but lived in the bottom flat of a tenement, which gave him a postage stamp backyard. He had some kind of vat set ups, and used to produce goldfish for the local shops as his sideline. Once they were in the country, breeding goldies would have been easy. Nothing is easier to breed. He must have brought them in for the winter, and made his money selling in the warm months. It's something several of the older people in the family mentioned in passing, in exactly the tone non fishkeeping relatives probably talk about us - that 'weird but fair enough' tone.
I've seen some of Charles Darwin's (dried out) pigeons he studied at the Natural History Museum in London. He really made use of the expertise of pigeon fanciers. Often working class, now forgotten people gathered great knowledge about genetics and techniques, for pigeons, dogs, canaries (once a huge hobby here), fish... All the while farmers were learning about larger or more commercial animals. We amateurs are an ancient thread running though very long histories.