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Chromosome aberrations in pressure-induced triploid Atlantic salmon
K A Glover1,2, A C Harvey3, T J Hansen1
1Institute of Marine Research, Bergen, Norway.
BMC Genetics
|June 8, 2020
Summary
Hydrostatic pressure successfully creates triploid Atlantic salmon, but can cause chromosome aberrations and aberrant inheritance. This may explain poor performance in farmed triploid salmon, warranting further research.
Area of Science:
- Aquaculture
- Genetics
- Fish Biology
Background:
- Triploid Atlantic salmon are produced via hydrostatic pressure for functional sterility.
- Poor performance in farmed triploid salmon is sometimes unexplained.
- Inheritance patterns after pressure treatment in salmon are uninvestigated.
Purpose of the Study:
- To investigate inheritance patterns in Atlantic salmon subjected to pressure-induction of triploidy.
- To determine if pressure treatment causes aberrant inheritance in Atlantic salmon.
- To explore potential links between aberrant inheritance and poor performance in farmed triploid salmon.
Main Methods:
- Genotyping 16 polymorphic microsatellites in eyed eggs and juveniles.
- Comparing fish subjected to pressure-induction of triploidy with diploid siblings.
- Analyzing inheritance patterns in communally reared fish.
Main Results:
- Hydrostatic pressure successfully induced triploidy with no diploid offspring detected.
- Aberrant inheritance was observed in 0.9% of pressure-treated eggs and juveniles.
- 0.3% of pressure-treated fish showed aberrant inheritance, compared to 0% in controls.
Conclusions:
- Pressure-induction of triploidy in Atlantic salmon can cause chromosome aberrations, even with high success rates.
- Aberrant inheritance may be more prevalent in salmon with lower triploid induction rates.
- This phenomenon could contribute to unexplained poor performance in commercial aquaculture of triploid salmon.
