From what I have seen with benthic elasmos is that the two most over looked components are idodine and thiamine. Usually, rays (and benthic sharks) will have a diet high in those two due to eating of prey with an exoskeleton of some type that are higher in concentration of both.
Lack of iodine in the diet is directly tied to formation of goiters in elasmobranchs. It's seen in rays and a lot of the carpet sharks (bamboos and nurse species specifically).
Low thiamine can lead to heart issues and lessen brain function (or open the door for other neurological issues).
Usually if an animals is lacking in either and is showing symptoms, they can be nursed back to health by slowly increasing the amount in the diet. I've seen rather large goiters thin down and vanish with a simple iodine pill added to the food.
Lack of iodine in the diet is directly tied to formation of goiters in elasmobranchs. It's seen in rays and a lot of the carpet sharks (bamboos and nurse species specifically).
Low thiamine can lead to heart issues and lessen brain function (or open the door for other neurological issues).
Usually if an animals is lacking in either and is showing symptoms, they can be nursed back to health by slowly increasing the amount in the diet. I've seen rather large goiters thin down and vanish with a simple iodine pill added to the food.