Comparative gonad histology and semen quality of normal (XY) and neo-males (XX) of Atlantic salmon (Salmo salar)

• Published in: Aquaculture Research
• Main Authors: de Castro, PL, Patil, JG
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Blackwell Publishing Ltd 2019
• Subjects: Atlantic salmon; neomale; CASA; sperm; computer-assisted semen analysis; fish reproduction; gonadal development; gonadal histology of fish; monosex in aquaculture; Salmo salar
• Online Access: https://eprints.utas.edu.au/40112/

With an overarching objective of improving the hatchery production of Atlantic salmon (Salmo salar) all‐female progeny, this study comparatively evaluated the reproductive parameters between normal (genotype XY) and neo‐males (genotype XX). Four normal (XY) and seven neo‐ (XX) males, from the same brood stock, distinguished by their ability to or lack of expressing semen, respectively, were comparatively evaluated. The left testicular lobe was used for histomorphometric analyses, while the right for semen collection and sperm quality analyses. Histomorphometric observations revealed that neo‐male testes are irregularly shaped, and have poorly formed seminiferous ducts, higher proportions of interstitial tissue and lower gonadosomatic index (p p