What amount of mosquito larvae is appropriate for one betta?
A: Once upon a time, God created all creatures known to men (and a few more that roam the deep oceans that no one even knows exist ;) ). At some point, God created the PIG. Pleased with the results he figured that an aquatic pig version might be appropriate and created the BETTA.
Now that we all know exactly were bettas come from and that it has been established that they are nothing more than aquatic little piglets, one can quickly conclude that bettas will indeed devour food they like as though there is no tomorrow and this is their very last meal. Since bettas have no self control in the matter, the breeder has to step in and regulate his fish's food intake himself/herself.
One wonders, how much is too much? And how little is not enough?
So your question is (although pretty darn short) is in deed a good one. I will however go off the restricted topic of mosquito larvae and expend (or spill if I may say) a bit to cover a bit more food territory.
A few things to remember when feeding bettas:
Now back to mosquito larvae etc... I have rarely fed them to my bettas, but I do know that not all mosquito larvae are created equal, meaning they too, get larger as they get older. Rather than give you a number of larvae, I would say feed enough to achieve the desirable belly size described above, depending on your betta's size and age.
For example, in most cases of adult bettas I feed about 5 to 6 fully grown frozen brine shrimp to each betta. Or about 4 frozen bloodworms. Young growing bettas that are smaller in size may need to eat the same amount to get the bigger belly described above.
In short, it is all in the eye (as opposed to the wrist LOL).
Signing off, oink oink to you.