Dufault, P.C., Neidig, C.L.
Abstract:
During larval rearing studies, only a small percentage of laboratory reared larval snook experienced full bladder inflation. This was attributed to oils on the water surface of the rearing tanks. Since bladder inflation is accomplished by the larval snook gulping air at the water surface, surface oils in the rearing tanks prevented this behavior.
Numerous methods have been tried to eliminate surface oils including; aeration, water flow and absorbent towels. Of these methods, surface spray proved the most beneficial as it eliminated surface oils, distributed food items (rotifers, dry diets), and produced water currents in which the larvae and fry could orient and feed. Similar observations have been made by John Tucker, Ph.D. (1995 Personal Communications, Harbor Branch Oceanographic Institution, Inc.).
(Mote Marine Laboratory, 1600 Ken Thompson Parkway, Sarasota, Florida 34236, USA)
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