Table 5. Final results with the best regression models analysed with the three original inputs (bounding box in pixels, segmentation mask area in pixels, species class label).

Best values are marked in bold.

Regression model	MAE (cm)	R2
GBR 10-fold	$1.8501\pm 3.0099$	0.7613
Extra trees 10-fold	$1.9715\pm 3.0396$	0.7462
SVM linear 10-fold	$2.6711\pm 4.4582$	0.4746
SVM radial 10-fold	$1.8741\pm 3.1885$	0.7307
CatBoost 10-fold	$\mathbf{1}.\mathbf{7614}\pm \mathbf{2}.\mathbf{7633}$	0.7926