Note
Larval swimming behavior in response to sharp laboratory haloclines was studied in 4 species of subtropical colonial ascidians: Eudistoma hepaticum, Eudistoma olivaceum, Ecteinascidia turbinata and Polyandrocarpa zorritensis. Larvae were observed as they swam upward from seawater of high salinity (33 or 28 ppt) into a layer of lower salinity. The vertical movements of larvae in columns with haloclines were compared with movements of larvae in unstratified control columns.