Skip to main content
. 2023 Aug 17;11:e15545. doi: 10.7717/peerj.15545

Figure 1. Fixed (blue circles) and semi- (green diamonds) landmarks used for the geometric morphometrics analyses of Atlantic salmon smolts.

Figure 1

Landmarks 21 and 22 (red stars) were used to correct for body arching and not included in the analyses. (1) Tip of snout; (2) Midpoint between 1 and 3; (3) Directly above middle of eye; (4) Perpendicular to lateral line, projected towards 3; (5) Midpoint of top of eye (directly below 3); (6) Midpoint of bottom of eye (directly below 3); (7) Midpoint of posterior of eye; (8) Midpoint of anterior of eye; (9) End of maxillary bone; (10) Posterior tip of bony operculum; (11) Dorsal surface posterior of cranium; (12) Perpendicular to lateral line, projected towards 11; (13) Anterior insertion point of dorsal fin; (14) Anterior insertion point of adipose fin; (15) Dorsal insertion point of caudal fin; (16) Perpendicular to lateral line, projected towards 15; (17) Posterior midpoint of hypural plate; (18) Anterior insertion point of anal fin; (19) Anterior insertion point of ventral fin; (20) Anterior insertion point of pectoral fin; (21) Lateral line—perpendicular to 13; (22) Lateral line—perpendicular to 18.