Obesity factor

The obesity factor is a biometric index that characterizes fish stocks . It describes the ratio of body weight to body length.

Definition and evaluation

The corpulence factor K is calculated using the following numerical equation:

{\ displaystyle K = 100 \ cdot {\ frac {m} {l ^ {3}}}}

,

where the body weight in grams and the length of the fish in centimeters . ${\ displaystyle m}$ ${\ displaystyle l}$

Low obesity factors generally indicate poor living conditions, such as B. overstocking or chronic lack of oxygen . Because of the high weight of the gonads at this time, determining the corpulence factor during the spawning season does not make sense.

Individual evidence

↑ VDI 4230 sheet 4: 2019-06 Biological methods for recording environmental pollution (bioindication); Passive biomonitoring with fish as accumulation indicators; Sampling (Biological procedures to determine environmental impact (bioindication); Passive biomonitoring with fishes as bioaccumulators; Sampling procedures). Beuth Verlag, Berlin, p. 5.
↑ VDI 4230 sheet 4: 2019-06 Biological methods for recording environmental pollution (bioindication); Passive biomonitoring with fish as accumulation indicators; Sampling (Biological procedures to determine environmental impact (bioindication); Passive biomonitoring with fishes as bioaccumulators; Sampling procedures). Beuth Verlag, Berlin, p. 13.
↑ ^a ^b VDI 4230 sheet 5: 2018-12 Biological methods for recording environmental pollution (bioindication); Fish as effect indicators (Biological procedures to determine environmental impact (bioindication); Fish as effect indicators). Beuth Verlag, Berlin, pp. 40-41.

[1] VDI 4230 sheet 4: 2019-06 Biological methods for recording environmental pollution (bioindication); Passive biomonitoring with fish as accumulation indicators; Sampling (Biological procedures to determine environmental impact (bioindication); Passive biomonitoring with fishes as bioaccumulators; Sampling procedures). Beuth Verlag, Berlin, p. 5.

[2] VDI 4230 sheet 4: 2019-06 Biological methods for recording environmental pollution (bioindication); Passive biomonitoring with fish as accumulation indicators; Sampling (Biological procedures to determine environmental impact (bioindication); Passive biomonitoring with fishes as bioaccumulators; Sampling procedures). Beuth Verlag, Berlin, p. 13.

[q1-3] VDI 4230 sheet 5: 2018-12 Biological methods for recording environmental pollution (bioindication); Fish as effect indicators (Biological procedures to determine environmental impact (bioindication); Fish as effect indicators). Beuth Verlag, Berlin, pp. 40-41.