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Old 01-04-2007, 10:53 AM   #1 (permalink)
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Default LMB weight formula

Knowing a reliable method to calculate the weight of largemouth bass can be helpful to determine if the basses weight is accurate. The formula that I have used for over 30 years is: length X length X girth divided by 1200 = weight in pounds. Bass do not grow the same every where and this formula takes into consideration most of the factors that affect weight. length is defined by measuring the fish laying flat with it's mouth closed. The length is measured from the closed tip of the basses mouth to the center of the tail along the lateral line. The girth is measured around the widest part of the bass, usually perpendicular to the center of the front dorsal fin, around the bass behind the pectoral fins. I usually lay a wet towell on the bottom of the boat, lay the bass on the towell and use a length of fishing line and cut to length to measure the bass. The girth piece of line I tie an over hand knot in the middle to identify it latter. Weigh the bass on a scale and release it immediately if possible.
A bass that was 24 1/2 inches long with a girth of 19 1/2, 24.5 X 24.5 X 19.5 divided by 1200 = 11.7 lbs. Most LMB have a girth that is 80% of the length, Florida LMB can be 90 to 100%* and spots and smallmouth tend to be 75% girth to length. Girth is the variable that depends of the health of the ecosystem and the bass. This formula is as accurate as your measurements with about 2%.
Tom
Ps; The formula can be helpful to determine if the bass may have swallowed a heavy object, when records are being claimed for example.
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Old 01-04-2007, 11:00 AM   #2 (permalink)
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Default Re: LMB weight formula

Thanks for the information. I have always wonder how they did that.
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Old 01-04-2007, 11:52 AM   #3 (permalink)
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And to think all these years I just used a digital hand scale for their weight. ;D
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Old 01-04-2007, 11:57 AM   #4 (permalink)
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Default Re: LMB weight formula

Yeah, but that scale doesn't deduct a handfull of 1 oz tungsten sinkers, a rock or two, and whatever else can be shoved down a bass throat before weighing. A hand compass might also be good to use to eliminate magnetic objects weighing it down.

Jim
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Old 01-04-2007, 01:03 PM   #5 (permalink)
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Default Re: LMB weight formula

Quote:
Originally Posted by KeithsCatch
And to think all these years I just used a digital hand scale for their weight.* ;D
Digital scales rely on good batteries to be accurate, very few low cost scales are accurate and can easily be off a pound or more. It's your catch at the end of the day and you can tell it anyway you want, most fisherman do! You would be surprised to learn what big bass have in them when they arrive at a taxidermist! And yes, bass fisherman still kill their first big bass the majority of the time, usually over handling it and stressing it beyond survival.
Tom
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Old 01-04-2007, 01:12 PM   #6 (permalink)
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Default Re: LMB weight formula

I always risk a heated discussion over this, but I clean hundreds of bass a year for eating, not all for myself of course. I cleaned a white bass for a guy and found a man's wedding ring in the stomach. Pop tops. Baling wire. A chunk of railroad tie wood (creosote treated). Lures of all makes and types, many back in use, only needing hooks, sometimes other hardware. Sinkers. Pebbles. Coins. Bottle caps. A brown pill bottle. Styrofoam galore. Fishing line wadded up. A Micky Mouse kids fishing float.

Add to the list unless you are a C&R angler.

Jim
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Old 01-04-2007, 01:55 PM   #7 (permalink)
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Before I started C/R all the time, I myself kept a few bass to eat. I'm sure Keith can vouch for that. LOL
Anyway, one day while I was cleaning some bass this is what I pulled out of them.


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Old 01-04-2007, 02:22 PM   #8 (permalink)
 
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What the **** is it?
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Old 01-04-2007, 02:55 PM   #9 (permalink)
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Default Re: LMB weight formula

Newt/salamander. The main point of finding that is knowing to tie on a plastic lizard.

Jim
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Old 01-04-2007, 03:05 PM   #10 (permalink)
 
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Default Re: LMB weight formula

I thought it looked like a blood worm used in salt water fishing.
I used to find some wild looking stuff while cleaning native brook trout in the winter because they were so hungry at that time of year they'd eat all kinds of things. The neatest was little tiny nymph cacoons made of fine pebbles and stones, at first I thought they were eating rocks, but I broke these small stone fabrications open and sure enough inside was a tiny green bug. I wonder how the fish knew they were eating the right things???? Smell maybe?
Thanks for the info Tom.
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