It's generally not recommended to feed your cat crab roe (also known as crab fat or crab brain), as it can easily lead to digestive upset and symptoms like diarrhea.
While crab roe does contain carbohydrates, calcium oxalate, and a variety of trace elements, as well as some protein, the potential benefits for your cat are significantly outweighed by the risks. Some might argue that the protein could contribute to stronger hair and sharper teeth, and they might even suggest adding it to their food. However, crab, in general, is considered a cold and potentially allergenic food, especially for cats. If your cat has allergies, consuming crab roe could trigger an allergic reaction. Furthermore, the high likelihood of diarrhea and general gastrointestinal discomfort make it best to avoid giving crab roe to your cat.
Crab roe is a very cold food, and for cats with sensitive stomachs, consuming it often leads to diarrhea. Additionally, cats that eat crab roe might also show symptoms of an allergic reaction or food poisoning, like vomiting, drooling, and even seizures. Therefore, to protect your cat's health, it's best to avoid feeding them crab roe.