Physiologic Responses of Cownose Rays (Rhinoptera bonasus) Following Freshwater Dips for Treatment of Capsalid Monogeneans.

Two cownose rays (Rhinoptera bonasus) presented for management of a severe capsalid monogenean infection (Benedeniella posterocolpa) in a mixed species habitat at an aquarium. A series of freshwater (FW) dips were elected to mitigate parasite resistance to praziquantel due to the endemic monogenean population in the system. A pre-treatment blood sample was opportunistically obtained, and subsequent samples were processed due to development of clinical signs. While the first FW dip was tolerated well and did not induce abnormal behavior, the second led to one individual presenting with tachypnea, pallor, and lethargy. Marked hematological abnormalities requiring medical intervention occurred in both individuals after the second dip. After treatment with elasmobranch ringers fluid therapy, sodium bicarbonate, prednisolone acetate, and vitamin E/selenium in the more severely affected ray, and elasmobranch ringers alone in the second ray, hematologic derangements and symptoms resolved. Hemoconcentration, hyperproteinemia, hyperlactatemia, and hyperglycemia were attributed to a stress response. A selective loss of urea after exposure to FW resulted in decreased plasma osmolality. Given the severity of the stress response and associated complications observed, hyposalinity treatments should be utilized with caution in this species. If this therapy is employed, the clinician is advised to be prepared to administer supportive care coinciding with the FW dip if necessary.