can someone explain to me what the crude ash is there for? why is it in most fish foods? (look at the small fonts in the back and youll see). is it good for the fish? anyways, i am a regular smoker. should i feed my fish some ash from my ashtray?
what the hell are ASHES doing in my fish food?
- Thread starter biboybaka
- Start date
They aren't adding ashes to the food, the crude ash content is more a measure of the food's digestibility.
This is Yahoo's "Best Answer":
"what is this "crude ash" in the fish food ingridients?
what is it exactly and purpose?
Best Answer - Chosen by Voters
"Ash" is the material in the food that doesn't burn up if the food is burned in the laboratory. After burning, the residue that is left is "ash."
This method of analyzing feeds is a bit anachronistic, because more sophisticated methods of analysis are available now.
Most of the material that makes up "ash" is unabsorbable by the animal, so "ash" is considered waste in animal feeds, and a low ash content is considered good. You'll notice that ash is usually expressed as a maximum ("not more than ..."), while things like protein and fat are listed as a minimum ("not less than ..."), suggesting that more protein (for example) is good, but more ash is bad.
However, since various substances can be included in "ash," they are not necessarily all undesirable. Also, the nutritional needs of nost aquarium fishes have really been studied very little, so we don't know exactly what would be contained in an optimal diet for them.
I think the process for determining the ash content may be more complicated than just burning the food - the International Organization for Standardization sells a six page document on how to determine crude ash in animal feed.
This is Yahoo's "Best Answer":
"what is this "crude ash" in the fish food ingridients?
what is it exactly and purpose?
Best Answer - Chosen by Voters
"Ash" is the material in the food that doesn't burn up if the food is burned in the laboratory. After burning, the residue that is left is "ash."
This method of analyzing feeds is a bit anachronistic, because more sophisticated methods of analysis are available now.
Most of the material that makes up "ash" is unabsorbable by the animal, so "ash" is considered waste in animal feeds, and a low ash content is considered good. You'll notice that ash is usually expressed as a maximum ("not more than ..."), while things like protein and fat are listed as a minimum ("not less than ..."), suggesting that more protein (for example) is good, but more ash is bad.
However, since various substances can be included in "ash," they are not necessarily all undesirable. Also, the nutritional needs of nost aquarium fishes have really been studied very little, so we don't know exactly what would be contained in an optimal diet for them.
I think the process for determining the ash content may be more complicated than just burning the food - the International Organization for Standardization sells a six page document on how to determine crude ash in animal feed.
The accepted method of analyzing ash content is by incineration at 550°C for 12 h in a muffle furnace. The residue (ash) is weighed and a ratio is calculated between the pre-burn weight and final residue weight.
Oddball;4196448; said:
we do a similar lab test in wastewater treatment all the time. what burns off are called volatile organics. its basically the digestible organic part of the food. what is left over is the undigestable 'fibre' part.
its mostly what the fish defecates out.
12 Volt Man;4196453; said:
It must be an industrial-wide method. I work in large-scale manufacturing process control (paper, chemical, pulp products) and the same method is used to calculate ash weight per cm/sq.