Problem is, the only wet food I can get them to eat lately is Authority ocean fish formula.
This tells you that a food preference has now turned into food addiction. To deal with this issue you need to stop feeding fish-based food of any kind for at least six months to a year.
In time the addiction will be under control and they will accept other foods again.
In addition to the immediate problem, which is a serious case of food addiction, fish is also a highly allergenic food (fish is higher in histamine than other protein sources). Sooner or later your kitties will develop health problems from it. Some of these health problems can be quite serious. To keep them safe you need to nip this dangerous addiction in the bud and have no fish-based food in the house until the problem is completely under control.
If sometime in the future you are able to feed fish again in small amounts
- and not more often than once or twice a week
- you will still have to avoid the brand and flavor that originally caused this problem with food addiction.
This is a quote from an article Dr. Jean wrote on canned food. I know you'll agree that it is excellent advice:
"Variety is, as always, important. Cats are easily addicted to a single food. One lady had a cat that would only eat Friskies Ocean Whitefish, and only if it was made at one particular factory (she knew this from the codes stamped on the cans), and even worse, only cans from one particular lot. She had friends scouring the entire mid-west to keep this guy supplied. If she doesn’t manage to successfully transfer him onto another food by the time the last can is gone, he may very well go on a hunger strike, with dire, if not fatal, consequences.
It’s a whole lot simpler to feed a variety of brands and flavors and prevent this type of addiction from developing. But be aware that cats are not necessarily their own best judges of the foods they should eat. Many cats would rather eat “junk food” brands from the supermarket, which contain more flavor additives than premium or natural brands that are better for them. (Well, sure, I’d rather eat ice cream than broccoli, too!) But we need to make wise, informed choices for our feline friends, and not let them manipulate us with unreasonable and unhealthy demands."