Abstract
A single heat shock of 28°C for 10 min, applied 15 min after water activation to five different batches of brown trout, Salmo trutta L., ova and replicated within one batch produced triploid rates ranging from 22% to 100% and variable survival to hatch ranging from 9.4% to 47.9%. Variability was greater among batches than among replicates. In general, the treatment reduced survival to hatch by 50%. The range of triploid yields obtained from a single heat shock regime is discussed in terms of potential advantages to aquaculture.
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