I you are right sorry!
BF (bite and fight- bait runners)
BJs are just BJs! One of the first sealed. Unit bite alarms late 70s - Pike mad-i got a pair for my Birthday in the 1980. It meant you didnt have to spend all night with a torch focussed on a circular bit of plastic as an indicator held in place by your mums knitting needle -or if you were posh, an isotope taped to it.