Some Thoughts on the Use of Fish Feed in Aquaculture

There are two major sources of fish food: one is natural food, and the other is artificial feed that is artificially produced according to the nutritional needs of fish. Under the current large-scale farming conditions, artificial compound feed has become an important source of nutrients needed for growing fish. However, in the face of the current wide variety of artificial compound feeds, how to choose beverages and adopt scientific feeding methods to obtain the best economic benefits is a concern for every breeder, and now we have a general understanding of the use of feed in aquaculture. It is to discuss several points of view for your reference. First, the relationship between the cost of breeding and the price of feed The proportion of feed costs and aquaculture on average reached 40% -50%, as high as 65%. Therefore, it is very important for farmers to obtain better economic benefits and reduce feed costs. Some people often think that feed prices are low, investment is low, and costs are low. This is especially true in economically underdeveloped regions. However, the results of feed use are not the case. Please see the following examples. Unit fish yield Feed cost = bait factor Feed price From this, it can be seen that the feed cost per unit of fish production is determined by the bait factor and the feed price, and there are two choices when selecting the feed: A Higher bait factor but feed price Lower (Example Tongwei pond material 503, bait coefficient 1.85, ton price 2150 yuan). B The bait coefficient is low, but the price is higher (Tongwei pond material 190, bait coefficient 1.25, ton price 3050 yuan). 1. Without considering other factors, the results of its use: A feed unit fish weight gain = 1.852.15 yuan / kg = 3.978 yuan / kg B feed unit fish weight gain = 1.253.05 yuan / kg = 3.813 yuan / Kg, that is, B feed can save costs by 0.165 yuan per kilogram compared to A feed, and can save 165 yuan per ton of fish. Therefore, large-scale farming can save considerable cost. 2. We then discuss the price relationship from the feed coefficient: For example, for the above A and B feeds, what should be the feed level of the feed coefficient, on the premise of keeping the feed cost per unit of fish constant? A feed ton price of 2150 yuan, 1.85 bait coefficient, then the cost of raising a ton of fish is 3977.50 (21501.85) yuan. B feed feed coefficient 1.25, then the price should be how much? Then B feed price should be 3977.501.25 = 3182 yuan. In other words, the price of B feed should be 3182 yuan/ton, and the actual B feed sold is only 3,050 yuan per ton, and the difference between the calculated price (less) is 132 yuan, that is, every feed produces 1 ton of fish and B feed is used in comparison with A feed. Get a discount of 132 yuan. It can be seen from the above results that, in feeding, a feed with a low feed coefficient is selected, but as long as its feed quality is high, the fish production cost is low, and vice versa. Second, the relationship between feed quality and growth rate Assuming a baiting rate of 4% of the case, a 1000 kg fish pond as an example, feeding the case of A, B feed. A. Feed bait material 1.85, then the daily gain is (10004%)/1.85=21.62 kg B. The feed bait coefficient is 1.25, then the daily gain is (10004%)/1.25=32 kg. The same growth for 100 days, A feed 2162 kilograms of long fish, B feed can be 3200 kilograms of long fish, more than A feed fish 1038 kilograms. 2. With the same increase of 2162 kg, A feed needs 100 days, then B feed only 67.6 days (2162 kg 32 kg/day), 32.4 days less than A feed. That is, at the same time (100 days), the B feed had 1038 kg more fish than the A feed. At the same weight gain, B feed can save 32.4% of the time compared to A feed. Third, the amount of feeding and feeding methods Feeding amount is determined according to the stocking stock size, quantity, planned growth rate of fish and the feed coefficient. Namely: feed amount = stocking weight increase factor, which can be used to calculate the total amount of food needed for the whole year, so as to arrange annual beverage plans and funds, avoid capital and feed gaps, and make preparations as soon as possible. The three months of August, September and August are the peaks of growth. Feeding accounts for 65% of the whole growth process. During this time, it seizes the opportunity to provide enough food to ensure the normal growth of the fish. 2. The amount of daily input is calculated based on the total amount of feed per month and the proportion of each month. It can also be calculated on the basis of 1%-5% of the fish's increasing body weight. The monthly average amount of feed is calculated, and the average amount in mid-day is the average amount. Less, more later. 3. Daily feeding frequency and time of summer fry seedlings, the water temperature is higher, the individual is smaller, the number of feedings per day should be not less than 5-6 times, the fish ingesting in 7-9 months is the most prosperous, the fastest growth period, the number of daily feeding should be 4-5 times. After October, as the water temperature decreased, the number of feedings gradually decreased until the fish stopped feeding. Each feeding time is not less than 20 minutes, in order to ensure that the fish eat 80% full without waste on the principle. 4. Feeding principles and methods are uniform, full, and good as a general principle. Evenly, according to the requirements of the fish, feed it evenly every day. This will not only prevent diseases and ensure normal growth, but also increase the efficiency of the use of baits. The sufficient amount of feed is to meet the needs of fish. Well, it is the bait. High quality, nutrition, palatable, fresh and so on. Timing, quantification, and positioning are our basic feeding methods. We also determine the frequency and quantity of feedings in a flexible way, combining weather conditions, water quality, food, and activity. In summary, in aquaculture to obtain good economic benefits, we believe that in the use of feed, mainly depends on the quality, rather than the price (of course, better quality and cheaper). In the case of superior capital and growing conditions, farmers should use high-quality feed and adopt scientific feeding methods.