7/12/2023 0 Comments Min hero 1-3 hatcherySisters of jacks were further identified to test whether females closely related to jacks also showed behavioural differences. We also tested the effects of freshwater rearing density (100, 50, or 35 fish per 200 L), food ration (high or low), sire (jack or hooknose) for jacks, hooknoses, and females with and without confirmed jack siblings. We tested the behaviour of hatchery-reared Chinook salmon ( Oncorhynchus tshawytscha) in fresh water and after 1 year in salt water. Juveniles often experience accelerated growth prior to becoming jacks, potentially caused by increased competitiveness. In Pacific salmon, males either become a competitive hooknose, or a sneaker jack, which is undesirable in aquaculture when overabundant. Alternative reproductive tactics are widespread in fishes.
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