Reply To: Genetically Engineered Animals and Kashrus

“If it has fins and scales I cannot understand why it would be a shailah at all.”

The reason is because fins and scales might just be an identifying mark of kosher species, it’s not the reason that it’s kosher, so a new man-made fish with fins and scales coming partially from a non-kosher species wouldn’t necessarily be kosher. This aspect of the shaila is mentioned by Rav Shternbuch on the radio show.