cuttlefish
鰂 centers on the cuttlefish, a marine animal. The meaning is specific to this creature.
鰂 combines 魚 (fish) with 則, which likely contributes the sound. The character is used specifically for cuttlefish.
The left side 魚 means fish, and the right side 則 looks like a rule or pattern. Imagine a cuttlefish with a patterned body, following the rule of camouflage.
For ソク, picture a cuttlefish wearing a sock on each tentacle: sock -> ソク, and the fish with socks is the cuttlefish.