We normally keep a perforated floating pail in the water to keep our extra
minnows alive and add to the on deck pail as needed. We add ice to the
water of the ones on the boat but they eventually die if the fishing is
slow.
Try the rock salt.
Another issue, sometimes not always, is that minnows will descale and
their waste will contaminate the water. One way to avoid that is to
circulate and filter the water. I just looked for a bookmark I had
for a small circulator and filter kit, but it seems I lost it somehow.
I'll take the time tomorrow and find it again. Cheap too - only like
15/20 bucks, but it does a great job. Works like an aquarium filter.
As far a putting the minnow on the hook...........perch will normally go
for
the head. The minnow is therefore hooked through the back down through
the
belley and back up through the head.
I never do that. I usually hook through the nostrils right below the
eyes.
Then again, I seldom use live bait. I've seen more ways to rig
minnows than you can shake a stick at and every one is as valid as the
other.
I have a bait bag on my boat when I use live bait. Anchovies with maybe a
sardine tossed in. Hangs on brackets on the back of the boat and a small
500 gph bilge pump sets on a bracket at the bottom of the transom. Pumps
fresh water into the bag and the excess runs out of small holes near the top
edge. If you were in a lake, the surface water being very warm may kill the
bait. But in SF Bay and the ocean warm water is not a concern.