BUEA, Cameroon — To his fishing peers, Ojah Alfred, 45, is a fisher like they are. But to Cameroon’s scientific community, he is also a scientist — a citizen scientist. For eight years, Alfred, alongside more than 80 other fishers across Cameroon’s three coastal regions, has been collecting data on marine species brought to landing sites and caught out at sea, using the Siren app, a citizen science platform. “I never imagined that the pictures I…