A preliminary hydro-biological study of the shell-fish farm complex, Calangawan Island, Babatngon, Leyte per Ampatin, Jr., Emilio, Aradillos, Ma. Remigia, Caones, Delicia, Chan, Carissa, Ocfemia, Judith, Go, Benjamin Rodrigo, Inciso, Ma. Rosario, Llames, Nella A., Nuevo, Marissa