Activated carbon Feed supplements improve digestion and growth
Aquaculture is one of the major industries producing a large amount of protein food, which aims to meet the dietary needs of consumers around the world. Fish is recognized as a valuable source of high-quality, digestible protein and a variety of vitamins and minerals. Due to the high nutritional value of fish, the price of fish feed affects aquaculture, so the feed cost determines the cost of fish. The purpose of the current study is to determine the effects of various activated carbon supplements on the nutritional digestibility and growth performance of fish. During the study, we conducted a ninety Days feeding experiment to study the effect of activated carbon obtained from different sources.
Activated carbon is a kind of carbon rich material. Activated carbon, an animal feed supplement, is generally made from sewage sludge, agricultural waste and other organic waste materials. Activated carbon can be used to treat soil remediation, gas storage, wastewater and separation. In the past decade, activated carbon has been widely developed as a dietary component in animal production, because it increases the digestion and metabolism of nutrients
Fish culture and experimental conditions
Random feeding in each pool fifteen To prevent fungal infection NaCl The fish is treated with solution, and the diet is provided twice a day. Feed ingredients and activated carbon are finely ground, then passed through the screen, and homogenized with the help of an electric mixer. take 10-15% Water is added to the mixer to prepare the dough for granulation. The resulting dough is then passed through a granulator to make granules. Feed the fish twice a day in the morning and evening according to the prescribed diet. Fish with total live wet weight 5% To feed. Record the initial weight of the fish. For each diet, three sets of water tanks were used, with a total of fifteen Fish species 。 After feeding for two hours , empty the remaining feed in each tank. Before replacing with tap water, thoroughly clean the water tank to remove any remaining food. Valves for The feces are collected from the fecal pipe of each water tank for laboratory analysis. Thin fecal lines are carefully stored to prevent Fracture and leaching of nutrients. The feces of each replica are dried in an oven and stored for chemical analysis.
Supplementary feeding of activated carbon feed
In this study, it was found that the initial weight of fish species was equivalent. Compared with other activated carbon and control feed, the weight of fish fed with activated carbon from poultry waste increased significantly (P<0.05) 。 Negative effects on growth were observed in fish feeding on part of activated carbon, and compared with fish feeding on other biochar, its growth was small. The weight gain of fish was observed in the experiment of feeding the feed supplemented with activated carbon from poultry feces (16.13g) And weight gain 256.58% 。 All other experimental feeds, including the control feed, showed an increase in growth, except for the test fish which were fed with some activated carbon. Low weight gain was recorded in the test diet 5.96 g And weight gain percentage 93.05% 。
Nutrient digestibility
The study compared the nutritional composition of diet, test diet and feces. All diets, including the control diet, contain a considerable amount of nutrients. However, significant protein content in feces was found in fish fed with partially activated carbon (22.08%) , Fat (3.71%) And total energy (2.14%)- Based on diet ( Test diet II) 。 Test diet provided in a diet based on poultry waste biochar supplementation -IV Fat excreted from the feces of fish (1.61%) , Protein (9.34%) And total energy (1.08%) The quantity of is small. Although the diet supplemented with activated carbon showed better fecal excretion than all other diets, the fecal excretion of the control diet was less than that of the diet fed with other supplements.
