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Fulton's condition Factor

Fulton’s condition factor is a measure of an individual fish’s health that uses standard weight.

As fish grow in length, they increase in weight. The relationship between weight and length is not linear. The relationship between length (L) and weight (W) can be expressed as: W = aL^b\!\,

where W is the whole body wet weight in grams and L is the length in centimeters; the factor 100 is used to bring K close to a value of one.

Fulton's condition factor is used as a basis for comparison to assess the health of an individual or group of fish.

Generally, fish that are heavier than the standard weight for their length are considered healthier, having more energy reserves for normal activities, growth and reproduction.

Generally, fish that are less than the standard weight for their length are considered in poor health, having less energy reserves for normal activities, growth and reproduction. Possible reasons for a poor Fulton's condition factor maybe the lack of food/prey, increased competition, habitat unsuitability or an infection.

 

To calculate the condition of your grayling your fish weight needs to be in grams, we have developed the tool below to convert weights in pounds into grams. Enter your weight and click calculate.

 


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Weight converter tool

Pounds: Ounces: Grams:
 

To calculate the condition of your grayling enter your values into the boxes below and click calculate.

 


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Condition calculator tool

Weight (grams):
Length (mm):

Fulton's Condition Factor:
This Means:


 

 

GS Symposium Speakers

GRT Funded MSc, PhD Studies

Two degree project interim reports were among presentations at the most recent Grayling Society symposium. Both studies are currently funded by the GRT and both operate on a premise that alongside the intrinsic value of grayling as a game fish, their survival challenges provide early indication of problems that are or will likely become problems for other salmonids.

 

Stephen Gregory (Game and Wildlife Conservation Trust) described an MSc study plan for statistical mining of the existing Wylye Study data, questioning the effect of extreme climate events on grayling population dynamics. He emphasized that the GWCT now leads all processing aspects of the 30-year Wylye Grayling Study (WGS) dataset - the longest and most complete in Europe...possibly in the world.

 

Vanessa Huml's (Manchester Metropolitan University) PhD study is titled Assessing adaptive genetic variation for effective management and conservation of European grayling. Read her description of planned work, noting reference to new sequencing technology and reference to the four U.K. genetically distinct groups identified in the earlier genetic census funded by the GRT.

 

The two studies both look at grayling population health/stability under extant environmental conditions but the doctoral work extends inquiry to genetic proclivity for survival ('evolvability').

 

Both investigators will submit detailed results for publication here after review in their respective peer literature.