In the wild a Bullhead catfish would eat a sh*t sandwich if it drifted by, but that doesn't mean that it's an ideal source of nutrients, or that one should feed that to a Bullhead kept in captivity, even as a supplement. In the wild, the stomach contents of Tropheus moori have shown to contain as much as 25% detritus & sand during certain times of the year, does that mean that one should supplement their diet in captivity with detritus? Of course not, but this is the type of logic being used in the Bullhead catfish example. Most fish are opportunistic feeders, and in the wild will eat pretty much anything that is even remotely considered a source of nutrients.
As previously stated;
I have no issue with those that feel the need to supplement a nutritionally balanced food such as a premium pellet, but with the numerous options available it makes absolutely no sense to even SUPPLEMENT with a foodstuff such as mammal meat, trimmed of fat, and deveined, or not. There are far better options for fish, that contain a more balanced amino acid & fatty acid profile, and that are far more nutritionally geared towards the nutrient requirements of a fish, even those classified as carnivores/piscivores.
As previously stated;
I have no issue with those that feel the need to supplement a nutritionally balanced food such as a premium pellet, but with the numerous options available it makes absolutely no sense to even SUPPLEMENT with a foodstuff such as mammal meat, trimmed of fat, and deveined, or not. There are far better options for fish, that contain a more balanced amino acid & fatty acid profile, and that are far more nutritionally geared towards the nutrient requirements of a fish, even those classified as carnivores/piscivores.