Comparison of spawning zone absence and presence in two NEA cod otoliths.

• Main Authors: Côme Denechaud (10515552), Audrey J. Geffen (3243306), Szymon Smoliński (10515549), Jane A. Godiksen (10515558)
• Format: Still Image
• Language: unknown
• Published: 2021
• Subjects: Evolutionary Biology; Ecology; Developmental Biology; Inorganic Chemistry; Environmental Sciences not elsewhere classified; Biological Sciences not elsewhere classified; routinely recorded outside; recent experimental studies; physiological processes behind; large archival collection; investigate temporal changes; different life history; represent spawning events; spawning zones likely; spawning zones could; spawning zones appear; first spawning events; accurately record maturity; otolith spawning zones; northeast arctic cod; spawning ?</ p; gonad maturity stages; otolith &# 8220; spawning zones; &# 8220; otolith macrostructure; gonad examinations; first examined; sexual maturity; year lag; universal trait; study shows; results illustrate; previously proposed; migratory behaviors; general characteristic; environmental traits; energy partitioning; certain environments; atlantic cod; age derived; Arctic; Arctic cod; Northeast Arctic cod
• Online Access: https://doi.org/10.1371/journal.pone.0257218.g001

a) 10-year-old fish with no visible spawning zones; b) 10-year-old fish with five visible spawning zones, identified as a cluster of similar-looking narrow increments with significantly wider translucent zones. Black circles mark regular growth increments; white circles mark spawning zones as described above; semi-filled white circles indicate an incomplete marginal increment that would likely be a spawning zone when fully formed.