Diving Costa Rica Summer Salt Dive Center diving with Bull sharks

Freshwater tolerance

The bull shark is the best known of 43 species of elasmobranch in ten genera and four families to have been reported in fresh water.[14] Other species that enter rivers include the stingrays (Dasyatidae, Potamotrygonidae and others) and sawfish (Pristidae). Some skates (Rajidae), smooth dogfishes (Triakidae), and sandbar sharks (Carcharhinus plumbeus) regularly enter estuaries. Elasmobranchs' ability to enter fresh water is limited because their blood is normally at least as salty (in terms of osmotic strength) as seawater, through the accumulation of urea and trimethylamine oxide, but bull sharks living in fresh water reduce the concentration of these solutes by up to 50%. As a result, bull sharks living in fresh water need to produce twenty times as much urine as those in salt water.
http://en.wikipedia.org/wiki/Bull_shark

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[edwinha07]

Que Bueno esta, que dichosos, cuando me invitan.