Since marlin can’t yet be accurately aged, the age and length of different life stages can’t be determined. Striped marlin are an extremely migratory species. The biggest thing to keep in mind about the Striped Marlin is that it’s simply extremely rare and has quite a long time between possible chances. He or she has the most pronounced vertical line markings, hence the name. A nearly 500-pound striped marlin is a remarkable catch.