Excerpt from Tests of Hatchery Foods for Salmon 1951Results of the 1951 trials provided evaluations of beef lung, whale liver, arrow-toothed halibut flesh, and herring flesh, both as single rations and in combination with other products, as diet components for salmon. Additional information was secured on the value of preserved salmon eggs and tuna liver in composite diets. Toxicities probably due to hypervitaminosis A developed in certain diets, and the symptoms were noted. It was demonstrated that the mortalities which occur from feed ing meals at cold'water temperatures were probably not due to the unavailability of the protein or certain amino acids, but possibly to a vitamin deficiency. No differences could be demonstrated between the nutritional requirements of Chinook and blueback. Three potential production diets were developed. These diets contained no beef liver yet produced growth rates equal to or better than the standard control diet containing beef liver, with no evidence of nutritional inadequacy.To evaluate results, control diets were established in each experi ment. 'within groups of each experiment, changes in the diets were made either by substitution or by supplementation. In the first procedure a single product was withdrawn in part or in its entirety and another product was substituted. In the second, a combination of products was supplemented by the addition of another material and the entire previous combination reduced a proportionate amount. In the presentation, com parisons were made only between diets within an experiment. Each experiment has been presented separately and comparisons made between experiments by deduction based on the relative standings of comparable diets with reference to their individual controls.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.