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A number of marine teleost fishes habitually invade the calcium-rich freshwater streams and lakes of south Florida. Adaptation to these habitats requires a marked change in the osmoregulatory process. Salt loss to the environment must cease and dilution of body fluids from the inward
diffusion of water must be prevented. Calcium salts have an inhibitory effect on the diffusion of water across biological membranes, and their presence in local freshwater streams at relatively high concentration may play a decisive role in permitting the invasion of marine fishes. The present
study examines the ability of several species of typical marine teleost fishes to survive in dilute sea water with and without the possible protective effect of dissolved calcium salts. The experiments show that in the presence of a high concentration of calcium (ca. 20 mEq per liter),
marine fishes are able to thrive in a markedly hypo-osmotic environment (< 100 milliosmols per liter).
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.