https://www.globalseafood.org/advocate/application-of-the-general-welfare-index-for-pacific-white-shrimp-during-pond-grow-out/

Everything is on the internet now and the Prawn also, as sentient animals, need their say.

Here is one :

Should shrimp farming best practice in animal welfare use growth uniformity as the indicator of optimal culture conditions?

Certainly healthy shrimp in nature are uniform.

That is from single spawns of 150,000+.

This equates to 1000kg (1MT) batch at 20g end consumer whole (heads-on).

So, now you know.

The closer one gets to natural uniformity the healthier and happier the shrimp must be!

If your shrimp are not uniform then you should ask your vet to check for IHHNV disease as runt-deformity syndrome (RDS):

https://doi.org/10.1111/j.1749-7345.1991.tb00740.x

If no disease and affliction of size variation still occurs a re-analysis of culture conditions may be best practice.

Regulation in Europe could very easily record all farmed size variation data lifted from primary processing plant data (all shrimp are graded so data is there).

With same time date/batch code.

So this could be a proactive way for the industry (or any concerned party) to track global shrimp animal welfare.