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Monthly and mean length–weight relations ( LWRs ) were calculated for 19 freshwater fish species from the middle section of the lowland Elbe River (Germany):    Abramis   brama    (Linnaeus, 1758);    Alburnus   alburnus    (Linnaeus, 1758);    Anguilla   anguilla    (Linnaeus, 1758);    Ballerus   ballerus    (Linnaeus, 1758);    Blicca   bjoerkna    (Linnaeus, 1758);    Cobitis   taenia    Linnaeus, 1758;    Esox   lucius    Linnaeus, 1758;    Gobio   gobio    (Linnaeus, 1758);    Gymnocephalus   cernua    (Linnaeus, 1758);    Leuciscus   aspius    (Linnaeus, 1758);    Leuciscus   idus    (Linnaeus, 1758);    Leuciscus   leuciscus    (Linnaeus, 1758);    Lota   lota    (Linnaeus, 1758);    Perca   fluviatilis    Linnaeus, 1758;    Romanogobio   albipinnatus    (Lukasch, 1933);    Rutilus   rutilus    (Linnaeus, 1758);    Sander   lucioperca    (Linnaeus, 1758);    Scardinius   erythrophthalmus    (Linnaeus, 1758); and    Squalius   cephalus    (Linnaeus, 1758). The values of the exponent  b  in the LWR  W  =  a  TL   b   ranged from 2.882 (   Lota   lota   ) to 3.517 (   Cobitis   taenia   ) and the correlation coefficient ( r  2 ) was greater than 0.96 for all species except for    Cobitis   taenia    with 0.93. The relations allow for the accurate estimation of weight from length data with reduced handling times of fish in the field while enabling comparisons with other regions and future studies. The calculated  LWRs  together with species-specific abundance and catch data will be useful for fisheries modeling and estimating population status and related fish species protection, especially for the endangered species in the Elbe River.

﻿Length–weight relations for 19 freshwater fish species ( Actinopterygii ) from the lowland Elbe River, Germany

Length–weight relations for 19 freshwater fish species ( Actinopterygii ) from the lowland Elbe River, Germany