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Length to weight conversion??

MrSchrute

By MrSchrute
in Northern Pike Fishing

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Juneau4 Grand Master

Juneau4

Posted
Posted

Anyone know of a length to weight conversion chart? I know it won't be totally accurate but am just looking to get estimated weights on the Northerns I've been catching. Thanks in advance.

Check the mn. fishing reg. booklet or the Dnr. site. Lenghts and weights are listed for several different species including northerns. smile

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Steve Foss Grand Master

Steve Foss

Posted
Posted

The accepted one for pike is girth x girth x length divided by 800. Girth and length measured in inches. Length from front tip of jaw to very end of tail with the tail pinched, girth at the widest/tallest spot behind the head.

I've found it to be within half a pound on the pike I've both measured and weighed.

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jefflake Contributor

jefflake

Posted
Posted

I heard of this one also. My big one last year was 41.75 x 21. Doing the math, I come up with a little over 23 lbs. The weight on the digital scale was 21-6. Maybe my scale needed a new battery !! Steve, I think this normally is a good calculation for most northerns..............I actually thought my fish was going to weigh more than it did. I was guessing around 23 lbs before I weighed it and that might have been pretty close. But since I weighed the fish, I have been using the weight from the scale. I saved it in memeory on the scale so I can bring it up and look at it. The fish was released and a replica made.

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Steve Foss Grand Master

Steve Foss

Posted
Posted

Jeff, I haven't had a pike that big to measure and weigh. Most of the fish I've done both to were upper single digit fish and lower teens. I've also heard that the ratio mentioned is accurate to within 10 percent on pike, and maybe that's a better plus/minus figure to use than half a pound.

It's worth noting that the girth measurement is a bigger key here than the length, and if the measurement on girth is off by half an inch that can have a significant impact on estimate vs true weight. If your fish's girth was 20.5 instead of 21, the calculator gives you about 21.9, for example.

I know I've made some girth measurements of my own fish that I wasn't really confident in, so it can happen. Not saying that happened to you, just that the girth measurement is the touchy one.

Any pike 20 or over is potentially the pike of a lifetime, and is a fish very much worth cherishing forever! smilesmile

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