sustainability Article Typology of Smallholder and Commercial Shrimp (Penaeus vannamei) Farms, including Threats and Challenges in Davao Region, Philippines Misael B. Clapano 1,2 , Jenie Mae T. Diuyan 2 , France Guillian B. Rapiz 1,2 and Edison D. Macusi 1,2, * 1 Institute of Agriculture and Life Sciences (IALS), Davao Oriental State University (DOrSU), Mati City 8200, Davao Oriental