
TY  - JOUR
A1  - Escot, Carmelo 
A1  - Granado-Lorencio, Carlos 
T1  - Comparison of four methods of back-calculating growth using otoliths of a European barbel, <emph type="2">Barbus sclateri</emph> (G&#220;nther) (Pisces : Cyprinidae)
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1999
VL  - 50
IS  - 1
SP  - 83
EP  - 88
KW  - 
UR  - https://doi.org/10.1071/MF97260 
N2  - The allometric relationship between fish length and otolith radius was determined for a European barbel, Barbus sclateri, from two natural populations. The relationship was significantly different between populations, but did not differ between females and males. The ages of the fish were determined from the otoliths, and this was used to evaluate four back-calculation procedures: Monastyrsky&#8217;s method of direct proportion; two by intercept-corrected direct proportion (Fraser-Lee&#8217;s method and the biological intercept method); and the simple regression method. The biological intercept method provided the most reliable estimates of fish lengths at previous ages when otoliths were used. Lengths back-calculated from earlier annuli of older fish were quite different from observed lengths for each age and from lengths back-calculated from recent annuli. Resumen. A dos poblaciones naturales de barbo europeo, Barbus sclateri, se les determin&oacute; la relaci&oacute;n alom&#233;trica entre la longitud del pez y el radio del otolito. Esta relaci&oacute;n fue significativamente diferente entre las dos localidades geogr&aacute;ficas, e igual entre hembras y machos. Se utiliz&oacute; los otolitos para determinar la edad de los peces y para evaluar cuatro procedimientos de retroc&aacute;lculo: el m&#233;todo de Monastyrsky de proporci&oacute;n directa; dos de proporci&oacute;n directa en los que se corrige la intersecci&oacute;n, el m&#233;todo de Fraser-Lee y el de intersecci&oacute;n biol&oacute;gica; y el m&#233;todo de regresi&oacute;n simple. El m&#233;todo de intersecci&oacute;n biol&oacute;gica ofrece las estimas m&aacute;s reales de la longitud del pez en las edades anteriores a la captura. Por otro lado, las longitudes retrocalculadas a partir de los annuli formados en primer lugar de los ejemplares m&aacute;s viejos, fueron diferentes a las longitudes observadas en cada edad y a las longitudes retrocalculadas a partir de los annuli formados m&aacute;s recientemente. 
ER  -

