Itchy skate wing question and possible Roche Bros. downhill alert

Hi everyone - the fish the first couple of weeks at the new Roche Bros. at DTX was beautiful. Stuff looked really choice. But last couple of visits, the stuff has looked really second rate. All the fish also seems to have this sheen to it, which looks unusual. The fish at Whole Foods by comparison just has a normal look to it, not this weird shine. Any insight?

But tonight they had skate wing, looked fresh...soaked it in milk, floured and pan fried it. Gave a piece to the infant baby and she starts really freaking out. So we try it and whoa - our lips were super itchy! None of us have food allergies but we all clearly had a reaction to something in the skate wing.

My googling failed to turn up anything definitive - some anecdotal stuff about skate being itchy, but nothing scientific. Anyone have any insight?