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Wild and hatchery-reared coho salmon smolts function of the central nervous system (O'Dell Oncorhynchus kisutch, collected from Bingham Creek, Wash1976) I ' ington. USA, were examined for copper and zinc content. Evidence indicates that levels of some nutrients are Using square wave voltametry, assays were made on eviscerated whole body samples. The results of the study indicated deficient in hatchery-reared fish. The association that zinc and copper levels were significantly lower in hatchbetween zinc deficiency and cataracts in rainbow trout ery-reared smolts than in wild smolts of the same parentage. Salmo aairdnen was described by Ketola (1979). In the 0 Mean zinc concentrations for wild and hatchery-reared early 1980s, a high prevalence of bilateral lenticular smolts were, respectively, 16.79 and 11.50 pg g' g wet wt, 81,30 and 51,01 pg g l dry wt, and 0,16 and 0,111 pg mg-l cataracts was observed among hatchery-reared chiprote~n. Mean copper concentrations were 1.9 and 1.7 pg g-' nook Oncorh~nchus tshaw~tscha and coho 0 . kjsutch wet wt, 9.15 and 7.54 pg g-' g dry wt, and 0.018 and 0.016 pg salmon in Washington State (USA) and British mg-' protein. Differences in body burden Were statistlcally Columbia (Canada). The condition was not observed in significant ( ~ < 0 . 0 0 0 1 ) for both metals, except for copper on wild fish, The cataracts were likely caused by a functhe pg mg-' protein basis. The purpose of this note is to call attention to an apparent insufficiency of copper and zinc in tional zinc deficiency resulting from an interaction of hatchery-reared fish as compared to their wild counterparts. zinc with high levels of calcium and/or phosphorus in This study follows up on a project in which a similar condition the presence of phytic acid found in dietary fish meal was found to exist with respect to body content of selenium. (Hardy & Shearer 1985, Richardson et al. 1985). Felton The total work is part of a continuing effort to better evaluate immunocompetence in hatchery-reared fish. et al. (1990) demonstrated that body content of selenium was lower in hatchery-reared coho salmon smolts

Significantly higher levels of zinc and copper found in wild compared to hatchery-reared coho salmon smolts Oncorhynchus kisutch