RedDwarf;4230958; said:The dorsal stripe is from it being young. It goes away as they get bigger.
Thanks for your reply Reddwarf but I'm aware of the fact some Lepisosteids have a dorsal stripe as a juvenile and lose this into a pattern of spots later in life. Longnosed do not typically have this trait. If a longnosed does have a dorsal stripe it is typically rather un-noticeable or not very prominent. Often it is just a thin line. It will typically become apparent when it is breaking up into a series of dorsal spots but otherwise it is not a dark thick and prominent line..
This sort of makes these fish interesting... An oddity of variation for a Juvenile fish.