Total length: length of the whole fish ,or the extent between the snout headend and the caudal fin end.
Body length: or standard length, the straight distance form the snout headend to caudal fin base , i.e. the total length minus the part of the tail.
Body depth: the max depth of the body, or vertical distance from the highest point of the back to the abdomen.
Head length: the rectilinear length from the snout headend to the rear edge of opercle.
Snout length: the rectilinear length from the snout headend to the frontal edge of the eye orbit.
Eye orbit diameter: the diamater of the eye orbit ,i.e. the rectilinear distance from the frontal edge of the orbit to it's rear edge.
Eye 's gap: the extent between the rear edge of each eye orbit.
Caudal peduncle length: the rectilinear length form the anal fin base to the caudal fin base.
Caudal peduncle depth: the min depth of the caudal peduncle.
Dorsal fin depth: the rectilinear length of the longest fin ray in dorsal fin.
Pectoral fin length: the rectilineal length of the longest fin ray in pectoral fin.
Pelvic fin length : the rectilineal length of the longest fin ray in pelvic fin
Anal fin length: the rectilineal length of the longest fin ray in anal fin.
Caudal fin length: or called 'tail length', the rectilinear length of the longest fin ray in caudal fin.