Domestication: sterility/triploidy

Overall effectiveness category Awaiting assessment
Number of studies: 1
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Key messages

A controlled, replicated study in Ireland found reduced return of stock but similar weight, length and condition of triploid salmon compared with diploid salmon.

About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

A controlled, replicated experiment in Ireland in 1996 (Cotter et al., 2000) found reduced return of triploid salmon compared to diploid salmon to coast and fresh water sites after release. The ranched, mixed sex diploid group of salmon showed the highest percentage return to fresh water (2.25%). Across the three release groups, the percentage return of triploid mixed-sex and all female stocks (0.81 and 0.75) was significantly lower than diploid mixed-sex and all female stocks (3.42 and 3.95). Weight, length and condition factor were similar between triploid and diploid coastal return fish. Groups of mixed-sex and all female salmon stocks were produced and triploidy was induced in a proportion of fertilised ova in February. Groups of both diploid and triploid mixed-sex and all female fish were released from two sites on the western coast of Ireland; a tidal lake by a hatchery and next to a commercial aquaculture operation on the coast. Capture location and return data of the groups was gathered as part of an on-going Irish programme. Fifteen major salmon landing ports were monitored between May and June 1996.
Study and other actions tested
Referenced paper
Cotter D, O' Donovan V, O' Maoileidigh N, Rogan G & Wilkins N.P. (2000) An evaluation of the use of triploid Atlantic salmon (Salmo salar L.) in minimising the impact of escaped farmed salmon on wild populations. Aquaculture, 186, 61-75.

Please cite as:

Jones, A.C., Mead, A., Austen, M.C.V. & Kaiser, M.J. (2013) Aquaculture: Evidence for the effects of interventions to enhance the sustainability of aquaculture using Atlantic salmon (Salmo salar) as a case study. Bangor University