Show byproducts by products are important in fishing industry waste used for fertilizer often forgotten about in casual thoughts of the fishing industry Is the importance of products byproducts by these are principally meal fertilizer ti and oil which are manufactured from the waste of canneries and other fish plants in a big plant the waste may make up as much as half of the raw material oils are extracted from all parts of the fish alth although ough the public Is most familiar with fish liver oils which as the name implies are obtained only from fish livers an interesting te quirk observes a writer in the chicago tribune is that bodies of fish yielding liver oil are usually very lean while livers of fat fish contain little oll OIL medicinal oil is made from fresh livers although stale livers are used in making other oils oils are obtained either by pressing and cooking of waste or simply by cooking the waste and skimming the oil off the top of the vat fish oils are used among other things in making paints and varnish waterproofing ter materials linoleum leather soap and lard substitutes salmon sardines young oung herring hening and tuna in addition addition to the well ivell known cod are important in contributing oil from cannery watte waste to io add to the supply obtained from whale porpoise and menhaden fishing fish waste particularly the scrap left after oil extractions extract extra action ionIs Is being successfully used as a fertilizer and Is one of the most important sources of organic nitrogen the scrap is treated with acid and the resulting fish fertilizer often is mixed with other fertilizer compounds to form a complete fertilizer ti the feeding of fish and fish scrap to animals has been recommended and practiced tor for many years but it is only in recent years that use of fish meal as a stock and poultry food has grown rapidly like fertilizers meal is made from sacral scrap it must be dried carefully and ground into granular form for poultry feed or into a rather fine meal for other purposes |