Why fertilized tilapia eggs layered (and died)?

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Raghad Mouhamad

Based on the image,

High Density of Eggs: Confirms the description of a large, layered mass of Tilapia eggs. The close packing is very evident.
Yolk Division/Deformity: The close-up crops reveal more details. It may be possible to identify abnormal yolk structures and deformation but it's hard.
Container: The eggs are in a cylindrical plastic container, likely intended for observation. The height of the egg mass might be contributing to the oxygen issues at the bottom.

Shuangyao Wang

Thank you for your quick response. However, we have beeing using such a high density for over 10 years without any issue, neither the height of the egg mass.

Suppose the nutrition of broodstock. However, since we never saw large amounts of layered eggs before, we are unsure what happened.