Once frozen spearing thaw the are very soft. One small hit and they are gone. Any suggestions!!
Use a needle sharp hook and go from the bottom of the mouth and through the top of the head. Twist it, don't force it through.
If you are using two spearing, thread the first one on through the eyes and anchor it with the second one as I described above.
Even with that, a good tug by a fluke will take that spearing off in short order. That's one reason why I like Gulp!