widower, unmarried man
鰥 centers on a man who has lost his spouse or remains unmarried, specifically a widower or an older unmarried man.
鰥 combines 魚 (fish) with 眔, which likely contributes the sound. The connection between 'fish' and 'widower' is not obvious, and the exact historical development is uncertain.
The left side is a fish 魚, and the right side 眔 looks like a net or a trap. Imagine a lone fish caught in a net, separated from its school, like a widower living alone.
For カン, picture a widower who keeps a can of his late wife's favorite tea as a memento: can -> カン, and the can holds memories of his married life.