That is the small 6-7 YEAR old blood.
It is the best advice to keep track of what and when you feed any animals. Bloods have a voracious appetite and will get obese very quickly if we give in to their pleading looks and begging every time we open their cage.
Get a scale, by the looks of things the animal is not very big if I am thinking of the right size water bowl.
A large rat by many standards is between 250-350 grams. Thats the size a female rat will begin to have babies. It goes up from there to jumbo and XXL which will be in the 7-800's.
Depending on if you can get a picture with something like a pop can where we can judge the size of the animal, I would stick with small to MEDIUM rats for now weekly. Medium meaning 150-200 grams.
He may not poop for many months, but when he does, grab it and put it in a ziplock and throw into the fridge until you can get it in to the vet (preferably within a day of pooping) have a fecal float and perhaps a smear done to figure out if this guy has anything robbing him of nutrition.
When he gets older, yes, he very well could eat once every 3-4 weeks. They have an amazing SLOW metabolism and very few keepers understand just how FAT and obese they let their bloods get.
Don't let the common Fatty Mc Fatten blood pics on the internet fool you.
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