Feed issues in carp farming

With the continuous increase in the intensification of eel farming, the problems raised in eel farming areas have correspondingly increased issues such as water environment, germplasm, feed, and diseases. We will now focus on the following issues related to feeds:

First, feed issues

In China's breeding industry, the long-term use of high-protein, high-oil, antibiotics, hormones and chemical synthesis drugs led to a general decline in fish constitution, such as the performance of meat quality, high ester content, weak constitution, etc. Large, hepatic degeneration and absorption dysfunction, slow growth or stagnation, reduced feed efficiency, and inability to synthesize immune globulin in the body, etc., can lead to acute and chronic hepatic dysfunction and induce multiple secondary diseases. Our survey found that about 60% of the carp in the main culture area in China suffer from this disease to varying degrees. The early stage of its disease is generally about 25 to 30 days after stocking, and it is shown at 2 to 3 months after stocking. symptom. Reliable pre-screening methods are:

Look at the color of the liver, such as lesions of the liver was yellow-brown or light gray, etc., to see the liver tissue lesions, such as swelling, brittle, congestion, etc., combined with rapid slice observation.

Blood test: The total amount of severe liver disease is 3 to 4 times higher than the normal value, blood lipid triglyceride is 8 to 10 times higher, and cholesterol is 7 to 8 times higher. Tests by foreign scholars such as Jolget and Mott show that the blood pressure in Japanese and European eels is generally increased by 58% and 33% compared with the normal value.

Symptoms of carp hypertension are obvious, light appetite decreases, anorexia, refusal to eat, and restlessness, chaos, and wild travel. However, their symptoms are often misdiagnosed as viral infections and should be treated with caution.

Second, the issue of additives

Add hormone problem. According to reports, some aquaculture and feed producers are seeking the rapid growth of salmonids to increase their yields. Adding a large amount of animal endogenous hormones and steroids to feeds can increase the growth rate of salmon, etc., and its length can reach 60cm. And the one-year growth period can be shortened to nine months. Some places also promote this as an "achievement." However, according to relevant tests, the carp cultured by this method is abnormal development, and the hormone residue in the body is very long. They believe that this type of fish is more harmful than British “mad cow” meat. Therefore, it should be stopped in time.

Added mineral element problem. Mineral additives containing calcium and phosphorus as the main constituents have been popular for many years and have a positive effect on promoting growth. However, the use of long-term overdose has caused metabolic disorders and hepatic edema in salmon and other aquatic animals. According to studies by Japanese scholars Murakami and Konno, the use of excessive amounts of phosphate as an additive will not only lead to liver edema, but also cause imbalance in ion concentration in the body, resulting in a decrease in physical fitness, which is not conducive to transportation and wintering. It is advisable to stop adding or adding less phosphate especially at the beginning of autumn. In addition, excessive phosphate ions can affect calcium absorption, thinning the bone layer, and can also cause hyperthyroidism.

Add antibiotic problems. Due to the long-term addition of antibiotics, the resistance of fish and its environmental pathogens has become more serious, especially in recent years, from the use of oxytetracycline, tetracycline, erythromycin and chloramphenicol to the development of the use of norfloxacin, methyl fluoride The latest modern quinolones such as oxacin, ciprofloxacin and ofloxacin not only increase the cost of breeding, but also increase the level of drug residues, which poses a potential threat to human health.

Third, countermeasures

Reasonably regulate the total amount of feed. According to various natural conditions, water ecological characteristics, population composition and intensification, and other indicators comprehensively regulate animal nutrition methods, thereby replacing the so-called full-price feed formulation with qualitative concept. The requirements for squid feed are no exception, so as to maintain the overall ecological balance and ensure healthy farming, so as to achieve sustainable development with high production and stable production.

Uses FRC - vitality source additive. The additive is a kind of bioactive feed additive extracted from green plants. It has unique growth-promoting and disease-resistant functions, and has a significant role in preventing liver diseases of salmon and other fish. It can purify the liver environment, assist in the repair of liver cells and enhance immunity, play a role in detoxification and liver protection, it can avoid fatty liver of herring and its degenerative diseases.

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