🐟 Paddlefish Weight Calculator
Estimate paddlefish weight from length & girth measurements — imperial & metric supported
| Length (in) | Length (cm) | Est. Weight (lb) | Est. Weight (kg) | Avg Girth (in) | Classification |
|---|---|---|---|---|---|
| 24 | 61 | 4 – 6 | 1.8 – 2.7 | 12 | Juvenile |
| 30 | 76 | 8 – 12 | 3.6 – 5.4 | 15 | Sub-Adult |
| 36 | 91 | 14 – 20 | 6.4 – 9.1 | 18 | Small Adult |
| 42 | 107 | 22 – 30 | 10 – 13.6 | 21 | Average Adult |
| 48 | 122 | 35 – 50 | 15.9 – 22.7 | 24 | Large Adult |
| 54 | 137 | 55 – 70 | 24.9 – 31.8 | 27 | Trophy |
| 60 | 152 | 75 – 100 | 34 – 45.4 | 30 | Big Trophy |
| 66 | 168 | 100 – 140 | 45.4 – 63.5 | 33 | State Record Class |
| 72+ | 183+ | 140 – 198 | 63.5 – 89.8 | 36+ | World Class |
| Formula | Divisor | Est. Weight (lb) | Best Used For |
|---|---|---|---|
| Standard (L x G²) | 800 | 34.6 lb | General paddlefish |
| Pennell Modified | 900 | 30.7 lb | Lean/post-spawn fish |
| Wege & Anderson | 750 | 36.9 lb | Heavy-bodied fish |
| Spoonbill (L³) | 3500 | 31.6 lb | No girth available |
| Length-Only Estimate | n/a | ~33 lb | Quick field estimate |
| Girth-Only Estimate | n/a | ~29 lb | Unable to measure length |
| Water Body | Typical Length Range | Typical Weight Range | Best Scenario |
|---|---|---|---|
| Missouri River | 40 – 65 in | 25 – 90 lb | Snag Fishing |
| Mississippi River | 38 – 60 in | 20 – 80 lb | Snag Fishing |
| Lake Keystone (OK) | 42 – 60 in | 30 – 70 lb | Snag / Bowfishing |
| Lake Cumberland (KY) | 36 – 55 in | 15 – 65 lb | Snag Fishing |
| Aquaculture Pond | 24 – 48 in | 5 – 40 lb | Commercial |
| White River (AR) | 40 – 62 in | 22 – 85 lb | Snag Fishing |
| Stock Pond / Lake | 20 – 42 in | 3 – 30 lb | Stock Pond |
Due to the fact that the body of a paddlefish doesnt match the expected body of other fish species, it is difficult to accurately calculate the weight of a paddlefish. One might find that paddlefish with long bodies has greater weights then other paddlefish of similar species, but the rostrum of the fish creates the long body of a paddlefish. Thus, the length of the paddlefish can be a factor in calculating the weight of a paddlefish, but it is not a precise factor.
Due to the extended length of the rostrum of a paddlefish, the length of the paddlefish from the eye to the fork of the tail will be more accurate in measuring the weight of that individual paddlefish. Thus, measuring the total length of the paddlefish could lead to an underestimation of the weight of that species. The weight of a paddlefish is dependent upon the girth (distance around the body) and the depth of the body of the paddlefish.
How to Estimate Paddlefish Weight
The weight of a paddlefish is dependent upon the body condition of the fish, and the amount of plankton that the fish encounter in its environment determines the body condition of the fish. For example, paddlefish that live in areas that contain abundant plankton will have more body fat than paddlefish that live in areas with less plankton. Additionally, female paddlefish that contain roe will have more weight in the body than female paddlefish that do not contain roe.
Thus, you must measure the girth and depth of a paddlefish in order to accurately calculate its weight. The method for measuring a paddlefish will impact the accuracy of the calculated weight. For instance, measurements taken with a rigid bump board will differ from measurements taken with a soft tape measure.
Additionally, the habitat in which a paddlefish live will have an impact on the physical features of the species. For instance, habitats that contain abundant plankton may produce paddlefish that have greater depth of body than paddlefish from different habitats. Thus, these factors will impact the weight of a paddlefish, which you must account for when calculating the weight of that species.
The weight calculator for the paddlefish provide a confidence band for the weight of the fish rather than a specific number for the weight. This is because two paddlefish of the same length may have different weights due to the differences in the internal organ or skeletal structure of each fish. The confidence band for the weight of the fish provides an indication of how precise the measurement of the fish was; a wide confidence band indicates that the fish was not measured precise.
Thus, to obtain the most accurate measurement of a paddlefish, one should measure the girth of the paddlefish behind the gill area. Additionally, the depth of the body of the fish from the back of the fish to the belly should be measured as well. By measuring these three factors, an estimate of the weight of the paddlefish will be more accurate than if only one of those factors were measured.
