PiscesLogoSmallerStill Age/Size

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This drop-down menu allows you to choose from a range of calculations and models applicable to data entered in the form of size at age or time. The orange square with a black dot indicates the method currently applied to the data.



age size options



When a nonlinear regression method is chosen an initial parameter dialog window opens


Graphical von Bertalanffy

Length Weight Relationship

von Bertalanffy growth equation

Exponential growth

3 parameter Gompertz growth equation

3 parameter logistic growth equation

Weibull growth curve

Janoschek growth curve


4 parameter Gompertz growth equation

4 parameter logistic growth equation

4 parameter Richard's model

5 parameter Richard's model