in-too-deep
Well-known Member
Say you had a tank full of water sitting on a scale. Tank and water weighs, say, 200 lbs. Now, add 10 lbs of live fish. Assuming the fish are calmed down, would the scale read 210 lbs? Why or why not?
- Thread starter in-too-deep
- Start date
Janicholson
Well-known Member
Every boat in the ocean, and every load in your truck changes the weight. Fish (with their swim bladders) are neutrally balanced in water. Lets use an example of a farm truck with 250 bushels of Soy Beans in the box. If I bury a bushel of beans in a sack in the box The truck sure feels that extra bushel as weight, as the truck has 251 bu. in it. One will also notice that the beans are deeper in the truck, as is the water in the aquarium. Jim
Machnegative
Member
That's why many things i.e. Liquid fertilizer are sold by weight. You may mix two things and have an increase or decrease in volume, but the weight is additive. Soluble nitrate powders and soluble potash eps when mixed with liquids are a common example of volume changes when mixing.
blue water massey
Well-known Member
A couple of pictures of our lake or very large pond
We buy live trout (rainbow) for our lake.
The fish hatchery has a 300 gallon tank on a trailer.
They weigh it with no fish.
Load it up with about 150 fish in different sizes and re weighs as he charges buy the pound.
Always a start weight and gross weight on the scale ticket when he delivers.
I've been there when they are loading and have seen the whole operation and know 1st hand it's an accurate way to measure them.
So to your question yes they do.
We buy live trout (rainbow) for our lake.
The fish hatchery has a 300 gallon tank on a trailer.
They weigh it with no fish.
Load it up with about 150 fish in different sizes and re weighs as he charges buy the pound.
Always a start weight and gross weight on the scale ticket when he delivers.
I've been there when they are loading and have seen the whole operation and know 1st hand it's an accurate way to measure them.
So to your question yes they do.
blue water massey
Well-known Member
sorry markct reply was meant for in-too-deep
guess I hit the wrong reply button
guess I hit the wrong reply button
Determined
Well-known Member
You said the tank is full of water.
If that is taken literally then when the fish are added they will displace and overflow an amount of water equal to their volume.
so the scale would not read 210 lbs.
old
Well-known Member
- Location
- Camdenton Missouri
So is the tank truly full as in can not hold one more drop of water?? If yes then when you add 10lbs of fish then the tank will over flow and will drain out 10lbs of water so then it still has the same weight give or take a small amount
Majorman
Well-known Member
- Location
- Scarning, Norfolk, England
We used to have a question in our school exams at age 11, many years ago.
Which is heavier, a ton of lead or a ton of feathers?
:0)
Which is heavier, a ton of lead or a ton of feathers?
:0)
Ultradog MN
Well-known Member
- Location
- Twin Cities
Give a man a fish and he'll eat for a day.
Give a man a stiff drink and he won't care about the darned fish nor will he care much for drinking water.
Give a man a stiff drink and he won't care about the darned fish nor will he care much for drinking water.
OldFarmTractor
Member
Or which is heavier, a pound of gold or a pound of feathers....
Of course the correct answer is a pound of feathers.
And here is the reason..............................
True in the avoirdupois system, but not in the troy. In the Troy system only 12 ounces equal a pound. So a pound of feathers weighs 453.59 grams approximately and a pound of gold weighs 373.24 approximately. So a pound of feathers weighs more then a pound of gold.
Of course the correct answer is a pound of feathers.
And here is the reason..............................
True in the avoirdupois system, but not in the troy. In the Troy system only 12 ounces equal a pound. So a pound of feathers weighs 453.59 grams approximately and a pound of gold weighs 373.24 approximately. So a pound of feathers weighs more then a pound of gold.
Gambles
Well-known Member
A theoretical question is just that, theoretical. "concerned with or involving the theory of a subject or area of study rather than its practical application"
So when the full container gets the fish added, does the displaced water that runs out of the container stay on the scale, or does it run off the scale? Do you take the weight reading immediately or after the water evaporates?
So when the full container gets the fish added, does the displaced water that runs out of the container stay on the scale, or does it run off the scale? Do you take the weight reading immediately or after the water evaporates?
Is the tank full to the brim before the fish are added or to a normal several inches below the brim after the fish are added?
A 20 gallon tank with water would weigh around 200 pounds total. From a practical standpoint, that is too small an aquarium to keep 10 pounds of fish alive for very long.
A 20 gallon tank with water would weigh around 200 pounds total. From a practical standpoint, that is too small an aquarium to keep 10 pounds of fish alive for very long.
James Williams
Well-known Member
A good friend of mine hauls fish for a living,He will add X amount of water in his truck,he has lines painted on the side of his truck.When he adds fish to the water and the water level rises he can tell the pounds of fish he has loaded
jimmy
jimmy
Tramway Guy
Well-known Member
Like the story of the rendering truck that got scaled by the highway patrol. They said he was overweight; so the driver pounded on the side of the truck and all the flies inside took flight. He was then OK on the scale.
in-too-deep
Well-known Member
Sioux tank. Blue scale.
in-too-deep
Well-known Member
Crappies. Got em out of Little Elbow east of Waubun.
in-too-deep
Well-known Member
Great! Thanks!
in-too-deep
Well-known Member
Kinda like when I mailed a package the other day. Lady said it was .2 oz over the limit and had to go Priority. I asked if I should blow on the scale.
TomH in PA
Well-known Member
It depends on whether the fish are neutral, positive, or negative buoyant.
If they sink when they stop swimming, the tank will weigh more than 200. If they need to keep swimming so they don't float up to the top it will weigh less.
If they sink when they stop swimming, the tank will weigh more than 200. If they need to keep swimming so they don't float up to the top it will weigh less.
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