[Openurmind]

“Less calcium in the feed?”

That is a good guess see #48. Possible Lycine deficiency.

[Seaplaner]

“Less calcium in the feed?”

That is a good guess see #48. Possible Lycine deficiency.

Also consider endocrine disrupters.

Find out what's hormone disrupters are inside the food, and where (what country) they come from.

(Soonish might be a good idea.)