How heavy is a trout?

When we catch a good trout in the net we can measure our capture, but you do not have a scale at the moment, we can not specify the weight of the caught trout.

Here an old method to know with some accuracy the weight of the piece is shown caught. Of course this is true for other species, although I think for salmonids is especially valuable.

A tape measure either roller or just an adhesive tape stuck to our cane helps us to start developing the formula weight of the fish.

The formula is based on the following consideration: "the weight of a body is equal to the volume by the density of the material that composes it."

And yet another: "the volume, keep the form it takes, is proportional to the size of its three dimensions." For example: length x width x height.

The formula for the weight of a trout can express it thus:

P = Kx (L) / 1000 = KxLxLxL / 1000

P is the weight in grams
L is the length in centimeters
K is a factor expressing the density and the proportions of the width by height to the length

(The K factor is a factor that changes depending on the species of fish that despite pretend)

To apply the formula, we will measure the trout in centimeters, multiply twice the length of the trout and the result multiply again by the K factor and then divide by 1000.

The K factor is previously measuring and weighing a few sacks of various sizes depending on the species you decide to make.

Formula factor K is: K = PX1000 (LxLxL)

The downside is that by applying this method the K factor varies considerably because in nature there are no two identical living beings even of the same species. So you need to determine an intermediate value. Also consider that a trout belonging to a river basin and of a certain size (25 cm for example) may vary significantly a trout of the same size in another river basin or just another river basin.

To get a general idea we can establish a table of values as follows:

Trout 20 cm can weigh between 88 g and 107 g
Trout 21 cm can weigh between 102 g and 124 g
Trout 22 cm can weigh between 117 g and 143 g

Trout 23 cm can weigh between 134 g and 163 g
Trout 24 cm can weigh between 152 g and 185 g
Trout 25 cm can weigh between 172 g and 209 g

Trout 27 cm can weigh between 217 g and 264 g
Trout 30 cm can weigh between 297 g and 362 g
Trout 32 cm can weigh between 360 g and 439 g

Trout 35 cm can weigh between 472 g and 575 g
Trout 37 cm can weigh between 557 g and 679 g
Trout 40 cm can weigh between 704 g and 858 g


Trout 42 cm can weigh between 815 g and 993 g
Trout 45 cm can weigh between 1002 and 1221 g
Trout 47 cm can weigh between 1142 and 1391 g

Trout 50 cm can weigh between 1375 and 1675 g
Trout 52 cm can weigh between 1547 and 1884 g
Trout 55 cm can weigh between 1830 and 2229 g

Trout 57 cm can weigh between 2037 and 2482 g
Trout 60 cm can weigh between 2376 and 2894 g
Trout 63 cm can weigh between 2753 and 3395 g

 I think the table "a priori", it may be more useful and more direct to find out "more or less" the weight of the trout or trout that we captured during our fishing trip. This exposed above assessment is good for rainbow trout, brook trout or prisoners, since as stated above the various K factor quite as fish pretend grief and yet still family salmonidae weights in different species are clearly variables and therefore each species will have a different factor K which in turn may vary depending ostensibly the river or river basin that is captured specimen of the species.

~ Carles V.