Hi, overfeeding, regardless of whether it is deliberate or not can cause serious health problems including excessively rapid growth rates, obesity and hepatic lipidosis which is commonly referred to as fatty liver. Obese turtles store fat in their abdominal cavity as well as their organs. The most commonly affected organ is the liver. Over long periods of being overfed and not receiving proper exercise, as in the case of being kept in an aquarium, the liver can absorb so much fat that it ceases to function properly and may result in the death of a reasonably young animal! An excessively fast growth rate will also result in a shortened life-span.
It is always best to duplicate growth rates that animals would normally have in a good season with good food availability in the wild. Remember, turtles need to exercise lots to find, hunt and consume food in the wild. This is not the case in captivity!
Overfeeding and rapid growth rates can also be responsible for egg-binding in young females. Obesity may also result in egg retention. In males, a low sperm count can be the result of overfeeding.
As I mention in my caresheet, it is best to feed hatchlings a good sized meal once per day and adults only 2-3 times per week. Always add freshwater plants like Vallisneria sp (Ribbonweed), Azolla and Elodea etc. because hatchling, juvenile and adults will consume aquatic plants if they are slightly underfed or fed the correct amount( for short-necked turtles only). If you are always over feeding them ‘junk food’ like bloodworms and ‘Brine-shrimp’ then they will not be forced to eat natural, nutritional food like Ribbonweed!
If you are also always overfeeding your turtles a diet high in protein then shell deformities like pyramiding and other shell deformities may occur! Sometimes turtles will experience difficulty shedding scutes properly with a diet high in protein and low in keratin.
I have been breeding turtles for over 36 years and have bred many species for the first time in Australia. I have bred thousands of turtles during this time successfully with a high number being 3rd, 4th and 5th generation.
Craig
Below is a rather graphic photo of a turtle that has not been fed enough and the ignorant keeper was too stupid to realize that there was a problem! Unfortunately it was a turtle that I sold to someone who then passed it onto a friend who clearly did not know how to look after it properly!