Rapeseed cake, also known as rapeseed meal, is one of the common feeds for fish. However, rapeseed cake contains mustard meal, its hemolytic toxicity properties make the fish's red blood cells melt, and the fish eaten excessive rape cake without virus can die. Practice has proved that: After detoxification of rapeseed cake, each feeding amount is not more than 1/3 of the total amount of bait is appropriate. The common method of detoxification of rapeseed cake is as follows: 1. The rapeseed cake is crushed by the neutralization method. The hot water and the rapeseed cake with a temperature of 40 degrees Celsius are added into the cylinder in a ratio of 1:4 to maintain the temperature at 38-40 degrees Celsius. Stir 1 hour with wooden sticks every 2 hours, stop stirring after 16 hours, allow it to naturally ferment for 6-8 hours, filter out the fermented water, and add fresh water to the original amount. After mixing evenly, add 10% caustic soda to neutralize acid to pH 7-8, add alkali slowly, and continue to stir, add in batches, add alkali and neutralize after precipitation for 2 hours, after filtration, wet material Can be fed. For long-term storage, the wet material can be dried or dried. Second, the fermentation method to dig a 1 cubic meter of earth pits, laying floor mats. Add the same amount of fresh water to the crushed cake, mix it and add it to the pit, put 500 kg of wet cake material in each pit, put it on top, lay a straw mat on top, and then use the soil to cap, ferment for 2 months or so, the cake can be Feed the fish. Third, the roasting method will be crushed rapeseed cake into the pan simmered for about 30 minutes, until the water disperses a tangy aroma, add 0.5% salt and stir, you can feed the fish. Fourth, the soaking method will be crushed rapeseed cake, soaked in warm water of 25 degrees Celsius or more for 5-6 days, until the cake has a pungent odor, stir with a stick into a paste, press 1 part of the cake-like pair of 1 water full Pool spilled.
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