[Mr. X]

I find the usual rule of thumb for locating a fish's brain doesn't seem to result in the quick kill that I would normally expect for mullet. I've often wondered if mullet's brain is further forwards or backwards. After looking at the head of the last mullet I speared, it looks to me like the brain is quite far back (maybe a further 1 or 2 cm) and high in the skull. So a normal stab would miss (in front) & a diagonal stab back from the same place would too (below). I haven't confirmed this yet but it would explain what I've seen.