Fresh and Salty

  • 25 October 2018
  • Author: Frederika Bain
  • Number of views: 6091
Fresh and Salty

MS alumna Keano Pavlosky, now in medical school at JABSOM, is first author of a recently published article, “The Effects of Transfer From Steady-State to Tidally-Changing Salinities on Plasma and Branchial Osmoregulatory Variables in Adult Mozambique Tilapia,” based on the MS thesis she completed in the lab of co-author Andre Seale (HNFAS). As the abstract explains, Mozambique tilapia, Oreochromis mossambicus, are native to estuarine waters that vary in salinity between fresh water (FW) and seawater (SW). While most tilapia studies have focused on acclimation to steady-state salinities, less is known about the ability of adult fish to acclimate to dynamically changing salinities. The researchers measured a variety of indicators in fish reared in FW and SW steady-state salinities, in a tidal regimen (TR) where salinities changed between FW and SW every six hours, and in fish transferred from FW or SW to TR. The study demonstrated the ability of adult tilapia reared in steady-state salinities to successfully acclimate to dynamically. changing salinities and suggested that early exposure to salinity changes does not significantly improve survivability in fish that are exposed to dynamically changing salinities later in life.