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Evaluation of gamete quality indicators for Arctic charr Salvelinus alpinus
Vattenbruksctr Norr AB Aquaculture Ctr North, Avagen 17, SE-84461 Kalarne, Sweden;Swedish Univ Agr Sci, Dept Anim Breeding & Genet, POB 7023, SE-75007 Uppsala, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Comparative Physiology.ORCID iD: 0000-0003-4208-3919
Swedish Univ Agr Sci, Dept Wildlife Fish & Environm Studies, SE-90183 Umea, Sweden.
2019 (English)In: Aquaculture, ISSN 0044-8486, E-ISSN 1873-5622, Vol. 504, p. 446-453Article in journal (Refereed) Published
Abstract [en]

The reproductive performance of farmed Arctic charr exhibits substantial individual variation. The causes behind this variation have not yet been properly explained, despite the species relatively long history in aqua-culture. The aim of the present study was to provide better understanding of the issue by evaluating parent and gamete traits in relation to fertility and offspring viability under routine hatchery conditions. Are losses mainly due to failed fertilisation or mortality? Are maternal or paternal factor more predominant? The study covered sex hormone status of the broodstock, egg traits (egg size and wateriness of egg batches), milt traits (volume, density, and sperm motility characteristics), and symmetry of early cell division.

We found that the majority of offspring loss occurred as embryo mortality, although a significant additional loss could be assigned fertilisation failure. Fertilisation and mortality rates were not inter-correlated. Neither of the evaluated egg traits, egg size and wateriness of newly stripped egg batches, proved to be useful indicators of egg quality. With regard to sperm traits, milt density as well as several computer assisted sperm analysis (CASA) parameters, i.e. swimming speed (VAP, VSL, and VCL) and beat cross frequency (BCF), were correlated with reproductive performance and could potentially be used as quality indicators for Arctic charr. Together, male 17,20β-P levels and BCF explained 69.5% of the between male variation in proportion of successfully eyed eggs.

The results support previous indications that post-ovulatory aging of oocytes is contributing to the impairment of reproductive performance in farmed Arctic charr. In addition, a significant paternal factor to this impairment has been exposed. However, the cause and mechanism involved are still far from clear.

Place, publisher, year, edition, pages
2019. Vol. 504, p. 446-453
Keywords [en]
Reproduction, Arctic charr, Sperm quality, Egg quality, Sex steroids, Fertility
National Category
Fish and Aquacultural Science
Identifiers
URN: urn:nbn:se:uu:diva-379324DOI: 10.1016/j.aquaculture.2019.02.024ISI: 000459962400052OAI: oai:DiVA.org:uu-379324DiVA, id: diva2:1300229
Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-03-28Bibliographically approved

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Schmitz, Monika

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