Hey Young . . .
A few years back a buddy of mine found an old meat grinder at a yard sale for 5 dollars.
He purchased it with me in mind, and then gave it to me.
If you can get/find one, buy it immediately.
Mount it on your cutting board, or somehow to the gunnel of the boat.
Save your dead Sardines after each cast and grind them up each time,
or grind them when you get a few. The same goes for/with Mackerel.
Once you get the fish all wound up you'll be surprised at what comes up the chum line.
Heck, you'll even be able to snag more Mackerel to grind up.

:7
John.
Parker 2320 'FloMar'.