Sandy,
Made a bad mistake. Caspin is one of the ugliest fish to be caught. we use to go out and gig Flounder and often catch Caspin (real name Scalpin).
What dad and i would go and get for fertilizer was Gaspereau. The correct name is Alewife. Part of the herring family. I would sit in the brook and see them swarming, them up they would charge. We would fill up the old van with potato bags full of them.
Ad.