HAS ANYONE LITERALLY HAVE A RAY DIE FOR NO APPARENT REASON?

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Pics from the necropsy by any chance? There are a lot of things to look for when cutting one open. The extra eyes on here might be able to help you pin point a problem.

Decreased liver/renal function is often a COD in FW rays. I've seen it happen a few times - and it can be tough to nail it down without a good look.
 
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