emersal
adjective
emer·sal
(ˈ)ē¦mərsəl,
ə̇ˈm-
: rising toward or floating at the surface of water —used especially of aquatic plants or animals or their products
the emersal eggs of many marine fishes
—contrasted with demersal 
Word History
Etymology
Latin emersus (past participle of emergere to emerge) + English -al