A marine ray (a euryhaline, osmoconforming, ionoregulator) moves its way from seawater to freshwater swimming up a river. Which of the following events is MOST likely to occur?
1) A decrease in osmolarity of the blood as the animal moves from seawater to freshwater
2) An increase in osmolarity of the blood as the animal moves from seawater to freshwater
3) No change in osmolarity of the blood as the animal moves from seawater to freshwater
4) The osmolarity of the blood cannot be determined based on the given information
