Breeding techniques

Methods

1, the correct site The crocodile breeding base is located in Sihui City, Guangdong Province, Zhenshan Tourist District, Zhenshan Tourist District is the only provincial tourism scenic spot in Sihui, the entire Zhenshan Tourist District in tourism and tourism, ecological agriculture, agriculture, pollution-free vegetables, flowers and non-polluting aquaculture is the main, the factory has no "three wastes" emissions, the entire area of excellent environmental conditions, no industrial pollution, pesticide pollution and living pollution. There is no "three wastes" emission from the factories, and the environment in the whole area is excellent, with no industrial pollution, pesticide pollution and living pollution. The water source is sufficient, the water quality is good, the air is fresh and the soil is not polluted. Crocodile breeding base of the fish pond, fertile soil, environmental health, fresh air, injection of new water is the Saddle Mountain spring water, absolutely no pollution, water quality and freshness, in full compliance with the requirements of non-polluting, pollution-free breeding.

2, fish pond facilities

(1) crocodile breeding in earthen ponds, a total area of 225 acres, each pond area of 1-2 acres, the bottom of the pond is flat, silt ≤ 20CM, the water depth of 1 - 1.5 meters. The ponds are surrounded by a 1-meter-high fence to prevent crocodiles from running away and outsiders from entering. The ratio of water surface to land area within the fence is about 1:1, which is favorable for the growth of crocodiles.

(2) Fodder fish (tilapia, silver and bighead carp) are cultured in earthen ponds with a total area of 165 mu, each pond covering 8-10 mu, with a flat bottom, silt ≤ 20 cm, and a water depth of 1.5--2 meters.

3, crocodile species selection The main species of crocodiles kept are Siamese crocodile, Nile crocodile, Bay crocodile.

4, clean and disinfect the pond After the fish pond dry pond sun bottom, before the release of seedlings with quicklime to clean and disinfect the pond, regulate the water quality.

5, water monitoring The base set up a quality control working group, responsible for quality and safety monitoring. In particular, the base of the environment around the aquaculture waters to implement strict control measures, the base of the quality control team must pay close attention to the surrounding farmland spraying pesticides, water sources, water quality changes whether or not to jeopardize the base of the aquaculture production, fisheries, environmental protection departments to actively cooperate with the timely adoption of remedial measures to prevent the impact of the base of the production once the pollution incident is found. We commissioned the Guangdong Provincial Fisheries Quality Supervision and Inspection Center on the base of the water and its surrounding environment, "pollution-free agricultural products, environmental quality assessment of the current situation", the report concluded that: the base of the aquaculture water quality in line with the "pollution-free food freshwater aquaculture water quality" (NY5051-2001) requirements.

6. Selection of Fry ①Select healthy and disease-free crocodile fry that have been tested and qualified for breeding and cultivation or imported from Thailand for stocking. ② Select healthy and disease-free tilapia, silver and bighead carp fry for stocking.

7, stocking density 200-300 crocodile fry of 30?100 cm (3?10 kg) per mu, and stocking density of forage fish (tilapia, bighead and silver carp) according to normal practice of catching big and keeping small.

8, feeding

① All crocodiles are fed with self-breeding, fresh feed fish (tilapia, bighead and silver carp), and the pond is regularly filled with new water. The implementation of catching big and leaving small, that is, the crocodile reaches 30 kilograms or more per tail, it is captured and processed on the market, not to meet the specifications of the market will continue to be graded breeding.

② Tilapia, bighead carp, bighead carp feed to mixed feed, corn, wheat, etc., scientific feeding, regularly with quicklime, beneficial microbial bacteria and water quality improver, equipped with an oxygenator, pumps to increase oxygen and water. The implementation of capture large and leave small, that is, is to meet the feed specifications of the capture provided to the crocodile for feed, did not meet the specifications of the continued graded breeding.

9. Daily Management Measures

The base adopts the business model that all crocodiles are fed with self-breeding, fresh feed fish (tilapia, bighead carp, silver carp, and bighead carp), and the feed is uniformly put in, and the management is uniformly carried out. We are responsible for training base staff in crocodile healthy aquaculture production technology procedures, providing technical guidance services, focusing on mastering water quality control, seedling purchase, feed use, disease prevention and control of drug use and other key links, the daily management measures are:

a), regular monitoring of the water quality for aquaculture, in which water quality of the water source is detected every 10 days, and the quality of water in aquaculture pools is detected every 15 days, and the water quality of the aquaculture pools is tested every 15 days. Adopting NY5051-2001 standard, it is required that PH value is 7?8.5, transparency is about 30CM, and dissolved oxygen is 4MG/L or more. The water quality of the base by the Guangdong Provincial Fisheries Quality Supervision and Inspection Center in the inlet and pond sampling test, the test of the 12 items, including color, odor, taste, total coliforms, mercury, cadmium, lead, chromium, arsenic, copper, fluoride, petroleum, hexachlorohexane, drip drip drip, etc., all in line with the "Pollution-free Food Freshwater Aquaculture Water Quality" (NY5051-2001) requirements.

b), the production staff should adhere to the "aquaculture production records", record the type of aquaculture, seedling sources and growth, feed sources and feeding, water quality changes, etc., to develop a scientific aquaculture program to promote the healthy growth of aquaculture objects.

c), the correct use of fishing feed, feed additives and aquaculture drugs. All crocodiles are fed with fresh tilapia, bighead and silver carp cultured in this base, and the amount required for each growth stage of crocodiles is reasonably and uniformly put into the crocodile, so that the crocodile's activity can be observed every day, the water quality changes, as well as the weather is good or bad to flexibly determine the amount of feed to be put into the crocodile every day to make it possible for crocodiles to eat well without wasting them, and to prohibit putting in the deteriorating fish; tilapia, bighead and silver carp cultured in this base are prohibited to use "three-no" feed. "It is forbidden to put in spoiled fish and meat. It is prohibited to use "three-no" feed and feed additive products for tilapia, silver carp and bighead carp breeding in this base. It is also prohibited to use prohibited drugs for fish disease control. Disease prevention and control adopts the policy of "prevention-oriented, prevention and control combined", with biological agents as the mainstay, reducing the use of chemical drugs.

Comprehensive measures to prevent fish disease include:

① Select healthy and disease-free, qualified by the test of their own breeding and cultivation or crocodile broodstock imported from Thailand for stocking.

② Select healthy and disease-free tilapia, bighead and silver carp fry for stocking. Sterilize the fish before they go into the pond; use high-quality feed; and regularly use photosynthetic bacteria, water quality improver and other biological agents to regulate the water quality.

At the same time, the crocodile ponds are constantly filled with new water and recycled water, i.e., the crocodile ponds are constantly filled with new water to ensure the freshness of the ponds, and at the same time, the old water of the crocodile ponds is discharged into the ponds where tilapia, bighead carp and bighead carps are raised, so the crocodile ponds make the best use of the waste water of the crocodile ponds to ensure the ecological balance and the environmental hygiene.

d), pay attention to the insulation of wintering crocodile is not cold hardy, when the water temperature drops to 15 ℃, it stops moving. We use film to cover the crocodile pond in winter cold weather, and take water from deep wells with higher water temperature to inject into the pond, to ensure that crocodiles and other fish safe wintering, while increasing the crocodile active, open feeding, so that it can also grow and develop in winter.