Site pages
Current course
Participants
General
Topic 1
Topic 2
Topic 3
Topic 4
Topic 5
Topic 6
Topic 7
Topic 8
Topic 9
Topic 10
Topic 11
Topic 12
Topic 13
Topic 14
Topic 15
Topic 16
Topic 17
Topic 18
Topic 19
Topic 20
Topic 21
Topic 22
Topic 23
Topic 24
Topic 25
Topic 26
Topic 27
Topic 28
Topic 29
Topic 30
Topic 31
Topic 32
Topic 33
Topic 34
Topic 35
Topic 36
Topic 37
Topic 38
Topic 39
Topic 40
2.3.5 Definitions of Position
U Maxillary symphysis L Mandibular symphysis OO Anterior edge of orbit O Posterior edge of orbit J Posterior edge of mandible (buccal commissure) Y Gill-cover notch G’ Posterior bony edge of operculum G Posterior membranous edge of gill cover P Anterior point of insertion of the first pectoral fin ray D1 Insertion of anterior dorsal (intersection of anterior margin of first dorsal spine, fin held erect with the contour of the back) D1’ Position of last ray of anterior dorsal D2 Insertion of first ray of posterior dorsal D2’ Position of last ray of posterior dorsal Z Anterior edge of cloaca A Insertion of first anal fin ray A’ Position of last anal fin ray B Insertion of dorsal lobe of caudal fin S Posterior tip of urostyle (forward protuberance of hypural blade) S’ Posterior edge of fleshy peduncle or of pigmented zone S’’ Point of upper caudal keel S’’’ Posterior limit of silvering (either last scale of the lateral line or the posterior zone limit of the scale covered by the peduncle) F Cartilaginous tip of shortest (median) caudal ray F’ Membranous edge of caudal fin at fork N Distal tip of the longest caudal fin ray with lobe normally extended N’ Distal tip of the longest ventral fin ray with lobe normally extended M Point where line NN’ intersects median longitudinal axis M’ Mid point of line MN’ X Distal tip of longest dorsal caudal fin ray, with lobe brought to the median longitudinal axis X’ Distal tip of the longest ventral fin ray, with the lobe brought to the median longitudinal axis |