Its to do within all the species of eels, and not just one or so. For how many hobbyists do you know who owns a SFE or Zebra? And in within the most of these, their eels never grow to what is anywhere near too their normal maxium growth.
Why is that? At most, I can only make known of what is from my understandings in all this. Like I said so many times before, that if I were to want to own a Zebra moray, I would have a holding 30 gal tank with live crabs as other natural foods which it preys upon.
There were but a handful of other hobbyists who owns either of these eels that has grown to what so many others figured to be shocking or rather perhaps, unbelievable. For do know that if a that certain eel isn't getting its normal diet that it would as if still in the wild, this will tamper with its natural growth rate.
Horchata, what many might consider difficult to feed isn't really all as what it appears to be, but rather what is, hard to understand is within all the times so many other said that eels are known to go on hunger strikes, that its all to often something which happens and within all honesty, this hunger strike can be triggered by any number of reasons.
One of the most in what I see is if your a rapid Ph change>
And what affects many eels within their diet are high nitrate levels>
Eels by far are the easiest marine animals we can maintain, and they will live far longer then any fish you care to think of. But if we are to feed much to often these animals, their life span will be shortening somewhat, but not by just living a few years. That either if its a SFE or Zebra morays, they still should live greater then 20-30 years to what can live as long as even 40 to 50 years.
The exact age of an eel is difficult to tell, unless one can examine them after death. The current techniques used to age eels as well as most marine animals is to cut a cross section of one of their teeth or a vertebrae, they have growth rings similar to trees that can help you decipher their age a bit more accurately than an educated guess. In bony fish many people extract the otolith, or ear bone, which also exhibit growth rings.
Myself, I plan to still have in my reef tanks after well enough stock with a number of coral and fish, will have two pair of dwarf eels.
Buddy