Can anyone steer me to a good chart, that shows approximate weight , using the length of the fish ? I caught a 35" black drum, this afternoon, and I'm "guesstimating" it was 20 pounds. I have a "fairly accurate" scale.....or should say "HAD", as the batteries were left in it over the summer, and ruined it when they leaked (oops !). Thanks !
https://pvmikesfishing.com/calculate-a-fishs-weight-without-a-scale/
https://www.dec.ny.gov/outdoor/9222.html
Sort of depends on who landed the fish...
If it was you, your estimate of 20 pounds would be accurate in my opinion...
If I caught it, you could easily add 50% to the weight...😁😁😁
Nice catch!
Best,
Fred
Lenght/weight converion Texas marine species identification :D it's good,,,but if the fish is shaped different,,,,,the weight is different,,,,I get 100yr old spring scales on ebay $8 to $15 and that work great ;D
It varies by species ! I only know halibut and salmon. I wonder if the salmon one will work for yellow tail? I will try it next year at Cedros. Length x girth squared and then divide by 800.
Cheers:
Todd
Quote from: foakes on December 26, 2018, 10:14:48 PM
Sort of depends on who landed the fish...
If it was you, your estimate of 20 pounds would be accurate in my opinion...
If I caught it, you could easily add 50% to the weight...😁😁😁
Nice catch!
Best,
Fred
HA! And if you caught it & I netted it I'd say it was probably 10lbs. ;D
21 pounds, 12 ounces.... or so they say. But some black drum have deeper bodies than others.
http://txmarspecies.tamug.edu/length-weight.cfm (http://txmarspecies.tamug.edu/length-weight.cfm)
-steve
Thanks, everyone ! And, Benni, I have a couple of those old Zebco "De Liars" scales.........in tackle boxes that are 'home" in Illinois ! It always seems that "what I want" is NOT "what I packed" ::)! The way the weather is looking, it will be a while before I get to go back out on the beach......lots of rain coming! Thanks again !..................Crow
the only formulas that sorta' work, are species-specific & you need length+GIRTH
for tuna, we use length x girth x girth (in inches) divided by 800.
Alan: That's the same formula we use for salmon. Its works well and is close except for the odd fish that is really long and skinny or really short and fat.
Cheers:
todd
Generally speaking, you need to first know your audience , it takes a fantastic story to usually impress your friends. Adding 20-30 % is not really hurting anything, except maybe the 12 year old rule? ;)
(http://i1344.photobucket.com/albums/p660/gst6814/639e38895cab11b3abe7260827d27802--going-fishing-ice-fishing_zps5orr6okk.jpg) (http://s1344.photobucket.com/user/gst6814/media/639e38895cab11b3abe7260827d27802--going-fishing-ice-fishing_zps5orr6okk.jpg.html)
Since the advent of television people are easily bored.
Quote from: Hardy Boy on December 27, 2018, 02:14:14 AM
It varies by species ! I only know halibut and salmon. I wonder if the salmon one will work for yellow tail? I will try it next year at Cedros. Length x girth squared and then divide by 800.
Cheers:
Todd
Same formula we use for muskies and it is pretty accurate up to 50" but is way off after that.
Larry
PS A happy new year to everyone
Got another drum, this afternoon, and using the "conversion table", a 38 incher should be 27 lbs, 13 oz.
My spring scale reads 28 lbs., so, I think the "table" is pretty close,
Very nice drum,,,, :D just keep catching them and posting the pictures,,, ;) to make sure the conversion table works ;D
I'd rather "check the chart" on some redfish, or pompano !!
Quote from: oc1 on December 27, 2018, 07:04:43 AM
21 pounds, 12 ounces.... or so they say. But some black drum have deeper bodies than others.
http://txmarspecies.tamug.edu/length-weight.cfm (http://txmarspecies.tamug.edu/length-weight.cfm)
-steve
I have a conversion schedule and spreadsheat of length to weight for Yellowtail provided by our fish tagging body. This can only serve as a very rough estimate. Some Yellowtail are thin and slender other short round and stubby! The fat ones have been feeding on anchovy off the coast and you can see it immediately and when you pick them up there is no doubt about the difference in weight despite them being fairly short.
Having done some work in fisheries management and conservation, particularly sharks; the conclusion was that length to weight charts are notoriously unreliable for anyone looking for more than a 'guestimate'.
A particular sample set that I worked on for just this objective, was over 900 samples of one species, mixed male and female fish, all caught in one season, all weighed and measured and then tagged and released. The results were charted then the 'best fit' line of representation plotted, along with two further lines at +30%, and -20%, to see whether these 2 further lines would encompass the majority of the results - which they indeed did.
So, at +305/-20%, the length to weight analysis was correct, but that is such a huge margin of error, as to be considered little more than a guess. The variations in fish weight against a given length are huge, and difficult to actually quantify. Fish arriving to an area at the end of a migration, skinny and low weight, fish having fed extensively -high weight. Females in various stages of pregnancy/egg development - variable high weight.
To get a feeling for these potential variations, just look at a weight distribution for human beings, that are all say 6'-0" tall??? Or better still, take a walk down your local mall, and view all the 6' tall people.
Quote from: Jeri on January 06, 2019, 06:55:48 AM
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To get a feeling for these potential variations, just look at a weight distribution for human beings, that are all say 6'-0" tall??? Or better still, take a walk down your local mall, and view all the 6' tall people.
LOL...... I always note my weight guesstimate of every fish I catch and my estimate is that the ORI length to weight charts are at least 20% of with mine.