Determination of morphometric parameters in the Mexican mojarra, Cichlasoma urophthalmus (Günther), for the design and construction of box graders

Citation

Martinez-Cordero FJ, Ross L & Martinez-Palacios CA (1990) Determination of morphometric parameters in the Mexican mojarra, Cichlasoma urophthalmus (Günther), for the design and construction of box graders. Aquaculture and Fisheries Management, 21 (3), pp. 293-298. https://doi.org/10.1111/j.1365-2109.1990.tb00467.x

Abstract
The morphometric relationships, standard length-weight, standard length-width and weight-width for Cichlasoma urophthalmus (Günther) in the weight range 0.78-262g were: log10 weight =-4.35 + 2.95 × (log10 standard length); log10 width =-0.73 + 0 99 × (log10 Standard length) and log10 width = 0.74 + 0.33 × (log10, weight). Two box graders were designed and tested based on these data. The operation efficiency (expressed as a percentage of the sample used to test it) was 96.1 % and 95% for the two graders. Results indicated a tendency to undergrading (small fish detained by the bars) by the first grader and overgrading (large fish going between the bars) by the second, the latter as a result of the major variability in the body shape from fish as they grow. The results are satisfactory, and larger graders for commercial use could be constructed based on these relationships.

Journal
Aquaculture and Fisheries Management: Volume 21, Issue 3

People

Professor Lindsay Ross

Emeritus Professor, Institute of Aquaculture