Digestibility of feed ingredients by juvenile oscar fish

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Digestibility of feed ingredients by juvenile oscar fish

Postby Kmuda » Mon Nov 19, 2012 12:12 pm

http://www.scielo.br/scielo.php?pid=S18 ... ci_arttext

It's nice to find scientific validation of the conclusions you've already reached. The important part of this study is:

Protein digestibility of the different ingredients was similar, showing that apparent digestibility of both animal and plant ingredients by juvenile oscars was efficient. Energy digestibility coefficients of fish meal and soybean meal were higher than those of wheat meal and corn. Carbohydrate-rich ingredients (wheat meal and corn) had the worst energy digestibility coefficients and are therefore not used efficiently by juvenile oscars.


What this tells us is that our Oscars are true omnivores, equally capable of digesting plants and animals, and that soybean products are preferred over wheat products due to higher digestibility.

Please understand that a reference to "digestibility" is a reference to the ability of the fish to process the proteins that food ingredient contains, which is an extremely important aspect when evaluating fish food ingredients. Wheat and corn are poorly digested which mean the proteins they possess primarily benefit the heteroptrophic bacteria (once the food passes through the fish), resulting in nitrate creep without benefit. And, as I state in the Fish Food Ingredients document, "Not to mention high starch content brings into play an entirely new discussion of glucose, glycogen, and body weight. Suffice it to say that if you are feeding your fish a diet heavy in the below non-preferred protein sources you are likely making your fish fat, which includes adding fat to the liver. Fatty liver disease is a leading cause of death in captive fish."

At the same time, use of functional Probiotics appears to "improve energy expenditure derived from sources such as carbohydrates and increase the incorporation of protein for growth"......
http://www.academicjournals.org/AJMR/PD ... t%20al.pdf

So use of probiotics improves a fish's ability to utilize wheat and corn as a food source, although there is no way I would ever appreciate a wheat content exceeding about 20%, although for Oscars about 30% should be an acceptable limit. Corn should simply not be used.

How all of this applies to the existing ingredient analysis I'm still trying to evaluate but I'm feeling a lot better about using and recommending Bio-Gold.
100g- Red Oscar Fish, Male Convict, 3 SDs - 20 gallon sump
55g - 21 Year Old Kissing Gourami + friends
55g - Angelfish - 29g Livebearer Community
4 Cats, 2 Shelties, 1 wife, 1 old lady, and one of the sub-adults broke back in.
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Kmuda
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Re: Digestibility of feed ingredients by juvenile oscar fish

Postby Kmuda » Fri Nov 23, 2012 10:59 pm

Ingredient analysis for applicable Cobalt and Hikari products that contain probiotics have been updated with this information.

Cobalt Aquatics Brine Shrimp Premium Fish Food Ingredients Analysis
http://www.oscarfish.com/3-star-foods/2 ... lysis.html

Cobalt Aquatics Color Premium Fish Food Ingredients Analysis
http://www.oscarfish.com/3-star-foods/2 ... lysis.html

Cobalt Aquatics Premium Cichlid Food Ingredients Analysis
http://www.oscarfish.com/5-star-foods/2 ... lysis.html

Cobalt Aquatics Spirulina Premium Fish Food Ingredients Analysis
http://www.oscarfish.com/4-star-foods/2 ... lysis.html

Cobalt Aquatics Tropical Premium Fish Food Ingredients Analysis
http://www.oscarfish.com/3-star-foods/2 ... lysis.html

Hikari Cichlid Bio-Gold Ingredients Analysis
http://www.oscarfish.com/4-star-foods/2 ... lysis.html

It is not yet known if the prebiotic product of dried Aspergillus niger fermentation extract found in other Hikari products, such as Massivore Delite, provide the same benefit of increasing digestibility of terrestrial starches. My assumption would be yes, based upon the research that goes into Hikari foods. But this is in no way confirmed.
100g- Red Oscar Fish, Male Convict, 3 SDs - 20 gallon sump
55g - 21 Year Old Kissing Gourami + friends
55g - Angelfish - 29g Livebearer Community
4 Cats, 2 Shelties, 1 wife, 1 old lady, and one of the sub-adults broke back in.
User avatar
Kmuda
Mad Scientist
Mad Scientist
 
Posts: 16556
Joined: Sat Mar 18, 2006 8:13 pm
Location: Fort Smith, Arkansas


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