MOBILE, Alabama — For consumers, the health of the Gulf fish population influences more than the price of a fried shrimp basket or the availability of a buttery plate of grouper. In the wake of the BP oil spill, scientists are closely monitoring the unassuming menhaden — more commonly known as pogy — which has wound its way into a web of products on dry land. Millions of pounds of the shiny, oily fish are hauled from the Gulf each year, processed into..more…