Lecherous. A salt bitch: a bitch at heat, or proud bitch. Salt eel; a rope’s end, used to correct boys, &c. at sea: you shall have a salt eel for supper.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Salmon * SammyNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes