Thiaminase

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gobucks1

Feeder Fish
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Mar 17, 2008
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To start off, Thiaminase is an enzyme that assists in the breakdown of Thiamine, also known as Vitamin B1. Thiamine is a crucial part of a fish's diet, and helps in the conversion from carbohydrates into glucose, which helps (in this case) a fish build up weight, bulk, body mass, etc.

Thiaminase helps lead to Thiamine deficiencies, which can have many negative affects. It has been shown to cause fish to be skittish, jumpy, or overall anxious. It sometimes also leads to poor growth and hemorrhaging, which, obviously, no one wants in their fish.

The feeding of fish rich in Thiaminase has been discussed alot recently on this forum. Many people don't really care whether or not they feed fish rich in Thiaminase, while others insist on avoiding it completely.

What many don't know is that Thiaminase is present in very many foods we feed our fish, not only live feeders. For example, frozen fish containing high volumes of Thiaminase will destroy the Thiamine, or Vitamin B1, in the fish over time, as Thiaminase cannot be destroyed by freezing, only by heating. A full list of fish, invertabrates, etc. containing high levels of Thiaminase, as well as fish without Thiaminase can be found at http://www.wetwebmedia.com/ca/volume_6/volume_6_1/thiaminase.htm

Sources: Wetwebmedia, American Society for Nutrition, wiki, Austin's Turtle Page

I don't claim to be an expert of any type, but in my opinion, in a captive setting, Thiaminase should be avoided as much as possible.

What do you think?

How important do you think it is to avoid the feeding of Thiaminase rich foods?

Any suggestions as to how to counteract the effects of Thiaminase?

Discuss...
 
Gobucks, the problem is some people remain stubborn believing this whole thing is bunk until it becomes clear the fish becomes malnourished for no reason other than the food they attempted to feed them with. I am all for avoiding thiaminase as well but in the end, some people choose to risk it.

P.S. We have a sticky thread for this in Disease section but not everyone bothers reading it. It is authored by Miles.
 
It does seem to be a problem, based on everything science can show us, but has it been tested in real world applications?

I see a number of people, very experienced fishkeepers, raising huge Payara, datnoids, and many other predatory fish, on a diet of almost nothing but goldfish, with nothing but, apparently, good results. Good growth, good form, etc.

How is this so?

I'm not saying that Thiaminase isn't harmful, (i believe that it truely is) but has anyone actually tested it out on predatory fish?

Maybe i'll do my science fair project on this next year. :nilly:

PS. I guess i was one of those who didn't bother to read it. :redface: Sorry. :)
 
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