'Scales' in the Bible

“This is what you may eat from all that is in the water: You may eat everything in the water that has fins and scales, whether in the seas or streams.

But these are to be detestable to you: everything in the seas or streams that does not have fins and scales among all the swarming things and other living creatures in the water.

Everything in the water that does not have fins and scales will be detestable to you.