When did Fisher Tiger die?

100%. The end of this chapter call a flashback. And like in every flashback the first chapter introduce new characters so Fisher Tiger will be introduced next week.

When did Fisher Tiger die? If a flashback does happen it will be going back to the time when Arlong split from the Fishman pirates and his relationship with Jinbe. I thought Fisher Tiger had already died at that point. Jinbe took over the crew after Fisher Tiger died right?

Besides what Kuya said, why do you think this? Apparently he's been throwing quite a bit of stuff at them based on what Luffy said, if he intended to actually follow them I don't know why he wouldn't have at this point.

you cant say that this isnt a time for a flashback because of VDD. Chopper flashback happened while Luffy was going to punch Wapol in the face. A flashback can happen in the worst time.

Concerning the argument that fisher tiger will not be in the flashback because the FB will only cover jimbe as captain of Sunny pirates, well no, many flashback in OP covered many years.