## Fish Measurement Recording

If a fish species is chosen, together with an element that is set to have measurements recorded for it, the 'fish measurement recording' form will open. For more information, see the list of all elements that allow measurements to be taken. While some species and element combinations may not usually have measurements recorded for them, the user will be able to choose what to record for themselves. See the fish measurements listing page for the commonly recorded element and species combinations.

Up to three measurements can be recorded for each element, labeled as M1, M2 and M3. As these can vary enormously between elements, classes and species, users are advised to consult the diagrams below before recording.

Bone ID
This field is copied over from the main recording form, and cannot be altered by the user.

Measurements
Each element has up to three measurements recorded for it, although many only have one or two. Values are recorded to the nearest 0.01mm.

Basioccipital (after Morales and Rosenlund 1979) | Ceratohyal (after Enghoff 1994)
Cleithrum (after Jones 1991; Enghoff 1994)
Dentary (after Jones 1991; Enghoff 1994)
Opercular (after Enghoff 1994) | 1st anal pterygiophore (after Enghoff 1994)
Otolith (after Jones 1991) | Parasphenoid (after Enghoff 1994)
Premaxilla (after Jones 1991; Watt et al. 1997)
Quadrate (after Morales and Rosenlund 1979)

Sources
Fish measurements follow Barrett's recording system (2001), which is in turn based upon Enghoff 1994, Jones 1991, Morales and Rosenlund 1979, and Watt, Pierce and Boyle 1997.

Finally, it is possible to record measurements for multiple specimens, using the New Record button.