Talk:Mackerel/@comment-32872377-20171001062055/@comment-27309899-20171001075144

it's literally in this page, you probably didn't get any due to bad RNG roll or you didn't equip enough special equipments like sonars, depth charge projectors and-- go read it by yourself. those equipments shall increase your odds of getting those fishes.

if you're asking which map is resource-friendly, then I'd say 1-1 (node B) and 1-5 (I just go straight to the boss and get dem fishes using 4 OASW ships.) I got 8 fishes.