I stumbled across that channel a few years ago, and love it, but then again I'm an otter fan. Given the cost of seafood in Japan, and the limited space, I think that they are
really dedicated to looking after their otters.
Otters have some of the fastest nerve speeds known in mammals.
They are an indicator species for ecological health, and their districts waxed and waned over time as the climate has shifted. Sea otters tend to be invertebrate feeders. Here in California, that is mainly sea urchins. The river otters feed more on a broader variety of invertebrates, and fish.
Otters occur pretty much everywhere that they haven't been extirpated, except Antarctica, Australia, and New Zealand.
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All the best, Peter