Method for producing fish meal and fish oil with tilapia leftovers

Abstract

The invention provides a fish meal and fish oil based on leftover bits and pieces of Tilapia mossambica and making method in preparing field of animal fodder raw material. The making method of fish meal comprises the following steps: choosing leftover bits and pieces of Tilapia mossambica as raw material; producing fish meal after boiling, pressing, drying, disintegrating, sizing and packaging. The making method of fish oil comprises the following steps: doing solid-liquid separation of pressing liquid through pressing step; centrifuging the liquid at high-speed to get upper layer oily substance being fish oil; thickening sub-layer fish dissolving pulp to return fish meal to improve yield rate. The invention processes leftover bits and pieces of Tilapia mossambica to be high grade fish meal and fish oil in changing waste into treasure way with totally-enclosed during the whole process and improves yield rate and prevents polluting environment through waste gas retracting device at the same time, which achieves one level domestic fish meal request in every index of quality belonging an environment-friendly product with fine quality that substitutes domestic fish meal absolutely.

Description

【Technical field】 [0001] The invention relates to a preparation method of fish meal and fish oil, which belongs to the field of preparation of animal feed raw materials. 【Background technique】 [0002] The shortage of fishmeal resources is a major problem that plagues the development of my country's aquatic feed industry. The protein source of aquatic feed mainly comes from fishmeal, while my country's self-produced fishmeal is less than 100,000 tons per year, and a large amount of fishmeal is imported. In recent years, my country's annual fishmeal imports have risen sharply. In 2004, 1.12 million tons of fishmeal was imported, accounting for 1 / 5 of the world's total fishmeal production. The actual use of fishmeal in aquafeeds accounted for nearly 50% of the global aquafeed fishmeal consumption. Affected by the decline of global fishery natural resources, the world's fish meal production has been declining year by year, and the price has continued to rise. Since 2000, the p...

AI Technical Summary

Problems solved by technology

At present, the use of tilapia leftovers is limited to simple processing such as processing dried fish powder, that is, the dried and pulverized product of the leftover raw materials, which contains 45% to 55% of crude protein and high oil content. It is prone to rancidity and odor during storage, and affects the digestion and utilization of other nutrients; or it is prepared by using salted raw materials, desalting, and then drying and crushing

This kind of fish meal is often due to incomplete desalination (more than 10% salt), improper use can easily cause salt poisoning in farmed animals

The low-value products obtained by the above simple processing often fail to meet the requirements of the feed industry for fishmeal raw materials, and it is also a huge waste of leftover resources.