In the manufacture of fishmeals by the wet-process method, a great deal of the valuable water-soluble fraction of the meal is usually lost in the effluent, and generally discarded (Beall, 1933). Since this fraction would be expected to be rich in the water-soluble vitamins as well as the soluble proteins, it seemed to value to investigate the possibility of using the extractives as supplements to the poultry ration. Stickwater is the name applied to the effluent remaining when the oil has been separated from the liquid pressed from the cooked fish during the process of manufacture of fishmeal by the wet-method. Until 1940, this liquid was largely a waste-product, because during the process of conversion to a meal, the water-soluble proteins contained in the liquid tended to cake on the hot surface of the drier to form a hard, tough, insulating coating that prevented complete dehydration. However, under a method . . .
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Pratt et al. (1945) studied this question.