The symptoms: Infected fish with bloody liver; abdominal adhesions; exanthema; scale loss; body (skeletal), opercula and eye deformity; fin rot, mouth and skin ulcers, ascites, and blindness.
Was there any reason to stress the fish? Like thunder or dolphins?
If there are no operations done recently (like changing of nets, transfer etc.) I recommend you to make a microscopic investigation near lesions and inoculate its liver and kidney to see if there is an infection or not.
Consider Scale Drop Syndrome in Lates - caused by a megalocytivirus. You need to do some histology on internal organs to get a better understanding of the extent of the damage. However, there are PCR's for Megalocytivirus which you could use too.
You should try to do some diagnosis examination on the moribund fish before died. The histopathological samples can assist you to find causative agents easily. Also, the use of some molecular techniques such as PCR or Nested PCR could be useful for rapid diagnosis in the mentioned mortality.
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