There are two main types of fish food sources: one is natural bait; the other is compound 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 for the growth of fish. However, in the face of the current wide variety of artificial compound feeds, how to choose feed and adopt scientific feeding methods to obtain the best economic benefits is a concern of every farmer. Now I will talk about the related issues of feed use in aquaculture. Point of view, for your reference.
I. The relationship between farming cost and price The average ratio of feed cost to aquaculture is 40%-50%, and the high is about 65%. Therefore, it is very important for farmers to obtain better economic benefits and reduce feed costs. Some people tend to think that feed prices are low, investment is low, and costs are low. This is especially true in economically underdeveloped areas. However, the results of feed use are not the same. Please see the formula below.
Unit fish production feed cost = bait × feed price
It can be seen that the unit fish production feed cost is determined by the feed coefficient and feed price. There are two options for selecting :
A has a higher bait coefficient but a lower feed price.
B has a low bait coefficient but a higher price.
Second, the relationship between feed quality and growth rate Assume that in the case of a feed rate of 4%, a 1000 kg fish pond is taken as an example, and the feeds of Examples A and B are fed.
A feed bait is 1.85, and the daily gain is (1000 × 4%) / 1.85 = 21.62 kg.
B feed bait coefficient 1.25, then the daily gain is (1000 × 4%) / 1.25 = 32 kg.
1. In the same growth for 100 days, A feeds 2162 kg of long fish, then B feed can grow 3200 kg of long fish, which is 1038 kg longer than A feed. 2. With the same increase of 2162 kg, A feed takes 100 days, then B feed only 67.6 days (2162 kg ÷ 32 kg / day), 32.4 days less than A feed.
That is, in the same time (100 days), B feed is 1038 kg longer than A feed. B feed can save 32.4% of the time compared to A feed at the same weight gain.
Third, the amount of feeding and feeding method 1. The amount of bait. It is determined according to fish stocking specifications, quantity, planned growth factor of eating fish and bait coefficient.
Namely: feeding amount = stocking weight × growth factor × bait
In this way, the total amount of bait required for the whole year can be calculated, so as to arrange the beverage plan and funds for the whole year, avoiding the shortage of funds and feed, and preparing for it early. Generally, the peak period of growth in July, August and September is the peak period. The amount of bait accounts for 65% of the whole growth process. During this time, the timing is seized and the bait is prepared to ensure the normal growth of the fish.
2. Japanese investment. According to the annual plan feeding amount and the proportion of each month, it can also be calculated according to the fish's incremental weight of 1%~5%, and the average monthly feeding amount is obtained. Generally, the average amount is mid-week, and less in the first half. More in the next ten days.
3. The number and time of daily feeding. Summer flower fry, the water temperature is higher, the individual is smaller, the number of daily feeding should be no less than 5~6 times, the fish feeding is the most popular from July to September, and the fastest growing period, the number of daily feeding should be 4~5 times. After October, as the water temperature decreases, the number of feedings decreases gradually until the fish is no longer ingested. Each time the feeding time is not less than 20 minutes, in order to ensure that the fish eats 80% full without waste.
4. Bait principles and methods. Uniform, foot, and good are the general principles. The uniformity is evenly fed according to the demand of the fish, so that it can not only prevent diseases, ensure normal growth, but also improve the utilization efficiency of the bait; the foot is the optimum amount of feeding to meet the needs of the fish; High quality, comprehensive nutrition, palatable, fresh and so on.
Timing, quantification and positioning are the basic feeding methods. At the same time, the number and number of feedings can be flexibly determined by looking at the weather, seeing the water quality, watching the fish eating and activities.
In summary, in aquaculture to achieve good economic benefits, the use of feed mainly depends on quality, not price (of course, better quality and cheaper). In the case of superior funds and growing conditions, farmers should use high-quality feed materials and adopt scientific feeding methods.
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