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James 1996

Created By: Travis Lascalza
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The diet of chinook salmon in New Zealand coastal waters is described, based on 803 adult salmon taken by commercial bottom trawlers in depths of 40-70 m off the mid-Canterbury coast during three summers from 1991/92 to 1993/94, and 36 yearlings caught in a shallow coastal embayment in 1992 and 1993. Adult chinook salmon were primarily piscivorous, [1]stout sprat-Sprattus muelleri-comprising 76% of the diet by weight. Pelagic swarming postlarval juveniles of the galatheid crab Munida gregaria, known as [2]red krill, and juvenile hoki, Macruronus novae- zelandiae, comprised 18% and 5% of the diet, respectively.[3] Prey diversity was extremely low, both in terms of the number of species consumed (10), and the proportion of stomachs containing a single prey type (81%). Diet showed no relationship to predator size or geographical area. Interannual variability of Munida and hoki in the diet appeared to be related to changes in their abundance.[4] Diet of yearling salmon consisted of several larval fish species and the mysid Tenagomysis macropsis. Both adult and yearling chinook salmon appeared to feed opportunistically on a relatively narrow spectrum of pelagic prey close to the ocean floor.
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