# Just a ballpark

Discussion in 'Gateway Catfishing Club' started by MO RIVER MAN, Aug 4, 2009.

1. ### MO RIVER MANNew Member

Messages:
298
State:
IOWA
A blue 52 inches and 3 ft girth? Any kind of ballpark figure is appreciated.

Messages:
940
State:
Okla/Texas

3. ### katcatchingfoolNew Member

Messages:
2,032
State:
illinois
I caught one that was 53 inches long and had a 33inch girth didnt weigh the fish but some guys on here said he must of been around 74lbs. I dont know for sure. I don't care how much a fish weighs unless i am in a tourney. :wink: but I do know if you google fish calculation you can find a formula to find out the weight. Hope this helps.

4. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
There is widely used formula for estimating a fishes weight Jake but I am
getting ready to board a flight and don't have access to it. It's length x girth \800 or something like that. You can probably google it.

It has a margin of error of + or - 10 %

I ran the numbers on one of my blues which was 53 and 36 and it was in the ballpark. It was designed for saltwater game fish but appears to work somewhat with the larger catfish.

Last edited: Aug 4, 2009
5. ### MickeyNew MemberSupporting Member

Messages:
14,592
State:
Illinois
The fish should weigh 40.17 lbs.

6. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
Found it

Girth squared x length \ 800

in your case 36 x 36 x 52 /800 = 84 pounds.

Sounds a little off to me. A 36 inch girth catfish though is a MASSIVE fish. The IGFA all tackle world record blue was 55 inches and had a 38 inch girth weighing in at 124 pounds.

38 x 38 x 55/800 = Shows as 99 pounds so that's not very accurate.

If you divide by 650 it seems to work out better.

7. ### Mr OkieNew Member

Messages:
940
State:
Okla/Texas
Length x girth x girth divided By 800 or Length X length X Length Divided By 1600

the link that I put up came from the MDC and was supposely ran on over 2,000 blues to set the scale.

8. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
Just for fun, I ran this formula on my 4 biggest fish and it came out within 5 pounds of being accurate on every fish. I'm curious to see what others think

Here's what I'm using

girth x girth x length /650

Curious to see your results. Ratman get to work lol

9. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
Mr okies length x length x length /1600 works out darn close too.

10. ### Mr OkieNew Member

Messages:
940
State:
Okla/Texas
Cuz Got this off the net looks like they have Pruitts fish at 44" girth...

IGFA All Tackle World Record Blue Catfish
Weight:
124.0 lbs.
Length:
58.0 inches
Girth:
44 inches
Angler:
Tim Pruitt of Alton, IL
Caught at:
Mississippi River (Illinois)

11. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
Dayumm my alzheimers is kicking in. You are correct mr okie. That makes pruitts fish work out then doesn't it?

12. ### Mr OkieNew Member

Messages:
940
State:
Okla/Texas
I have Pruitts at 122 using Length X Length X Length / 1600 = 121.9 + the 2 lb bait that it ate = 124.0LB

13. ### Mr OkieNew Member

Messages:
940
State:
Okla/Texas

Using the Lenght X Length X Length /1600 your fish show to be around 87lb....give or take..

14. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
I ran the formula you found and it indeed works out much closer then mine do.

Length x length x length / 1600

Well just call it The Okie Formula for estimating catfish weights.

Wow pretty amazing how it works out.

15. ### Mr OkieNew Member

Messages:
940
State:
Okla/Texas
The amazing world of the internet...Thank you Mr Gore....:big_smile: :big_smile:

16. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
I ran your formula on my largest bluecat to date and it came within 1 pound lol

17. ### Mr OkieNew Member

Messages:
940
State:
Okla/Texas
Are you flying the plane or just riding???????I hope you ain't posting and flying at the same time.....

18. ### CuzNew Member

Messages:
7,241
State:
DeSoto, MO
Standing in the jetway on an an American flight to New York. Fly to Portland tonight and staying in Vancouver. Long day for cuz

19. ### GaryFNew Member

Messages:
3,649
State:
O.P., KS
Ok, I found it. The ultimate blue cat weight calculator. :wink:

1. Measure length (L1) of fish from tip of tail to tip of nose.
2. Measure girth at middle (G1) between tail and middle (G2) and between nose and middle (G3)
3. Measure buoyancy (B1) (trapped air) of fish by measuring how far it floats out of the water.
4. Now we apply a simple formula to determine the volume (V1) in cubic inches of the fish, V1=PI*((G1+G2+G3)/3)*L1
5. Determine the weight in pounds for that much water (V1*.036126)
6. Subtract a little bit for buoyancy (B1)
7. Weigh fish on scale (S1) to arrive at accurate weight (W1)

Last edited: Aug 4, 2009
20. ### bluejayWell-Known Member

Messages:
8,502
State:
Napoleon, Mo.
:smile2::smile2::smile2: