Firstly, I’m sorry that this is a rather horrible question to ask!
Would it be possible to keep a whale alive whilst harvesting its fat or blubber? These whales would be living in captivity already and the community keeping them would want to use their fat as a fuel source. However, they would want to keep the whale alive so that it would keep producing fat, which could be harvested on a continuous basis, rather than having to go out and hunt a whale each time they needed more fuel.
Thanks very much!