Breeding Astragalus (I)
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December 13 05:14:01, 2018
Astragalus, also known as squid, long fish, etc., is a special aquatic product with both high protein and low fat combined with therapeutic effects. The meat of Astragalus is delicate, delicious and delicious. At the same time, it also has a very high medicinal value. The folks have the saying of “a small heat and yellow glutinous rice ginsengâ€, and they are collectively referred to as a “freshwater and glutinous rice glutinous rice,†and the current market price is relatively low. High, therefore, breeding astragalus also naturally becomes one of the first choices for farmers. I. Biological characteristics (1) Ecological habits Huangpi is the bottom-living fish that inhabits rivers, lakes, ditches, ponds, reservoirs and rice fields. Caves, lurking in the cave during the day, night for food. Hi in caves or muddy shores with more humus and more shallow water silt in caves, caves have at least 2 exits. The optimal water temperature for growth was 23 to 25°C; feeding was stopped below 10°C, and uncomfortable reactions occurred at water temperatures above 30°C. Astragalus is a carnivorous fish that feeds on insect larvae, cockroaches, cockroaches, frogs, and small fish. If there is not enough food, you will eat on your own. Sexual greed eats up to 15% of body weight during the growing season. It is also resistant to hunger. If you don’t eat for a long time, you will not die. Only lose weight. Astragalus uses the epidermis of the oral cavity and the larynx as an auxiliary respiratory organ. Therefore, it is not easy to die after leaving water. (B) reproductive habits 1. Sexual reversal of Astragalus phenomenon: the first half of the female is male, the latter half of the male, in the process of growth and development of Astragalus has a spontaneous sexual reversal stage, the middle of the transformation of the individual called the male and female body. All females were female before the first maturation, and all males were transformed after spawning. Female sexual maturity is 2 years old. Therefore, both 2nd and 2nd instars are female. Sexual reversal began at 3 years of age and males appeared, but less. Most of the four or five years are males. Specifically, all females whose body length is less than 20 cm are females, body length is 22-25 centimeters. Adults begin to reverse their body length. Males and females are almost equal at body lengths of 36 to 38 centimeters, and body lengths are more than 53 centimeters. All male individuals. However, individuals in different places have different rates of sexual reversal. Even individuals of the same body length have different rates of sexual reversal. 2. Breeding habits: Astragalus only breed once a year, and the spawning cycle is relatively long. The breeding season is fluctuated with high and low temperatures in June and July. Before the breeding season arrives, the first hole in the family is called the breeding hole. Generally, it is opened in the hidden part of the field and the bottom edge of the hole is immersed in water. The reproductive population of Astragalus is more female than male during the reproductive period. After females produce eggs, the gonads gradually reverse. After August, the female ratio is about 0.6:1. Astragalus has fewer eggs, and the absolute amount of egg shedding increases with body length. Generally, 20 to 30 centimeters, the amount of spawning of Astragalus is 100 to 500 grains, and about 50 cm is 500 to 1,000 grains, rarely exceeding 1,000 grains. Therefore, there must be a large number of close friends to reach a larger scale. Due to sexual reversal, parents and relatives must change every year. At the time of spawning, male and female prostitutes spit out foam at the entrance of the cave, pile up into nests, and then lay the eggs in a bubble and use the bubble buoyancy to float the eggs. Mature eggs golden yellow, inviscid, sink, egg diameter (after water absorption) 2 ~ 3 mm. The second egg is laid about 2 months after the first spawning. Intimate with egg protection, nursing habits. Fertilized eggs at about 30 °C water temperature, about 150 hours out of the film, the natural fertility rate and hatching rate of 90% to 100%. Newly hatched seedlings have a total length of 1.1 to 1.3 cm. It takes 5 to 7 days from the larvae to the membrane to disappear. Second, artificial reproduction (a) the choice of intimacy Astragalus gonad on the left developed, the right side of degradation. It is advisable to choose a body length of about 30 cm and a body weight of 250 g. This type of female cockroach has more eggs and more eggs. Mature females have enlarged abdomen and abdomen, spindle-shaped, with a purple horizontal stripe, abdomen light orange, slightly transparent, and swollen reproductive pores. The male body is more than 39 cm in length and 230-500 grams in body weight. The male body has a small abdomen. The face has blood-streaked markings, the genital pores are red and swollen, and the abdomen is squeezed by hand. A small amount of transparent liquid comes out. The ratio of male to female is 2:1 or 3:1. That is to say, 7 to 8 intimacies of 30 to 40 cm in length can be placed in each square meter of pool, and 3 to 4 of males in 60 cm in length can be placed. After purchase, use 10 mg/L bleach solution or 3% to 4% saline solution for 20 minutes to kill pathogens and parasites on the carcasses. 1 to 2 months before reproduction, it is necessary to meticulously manage, feed enough fleas, fly maggots and other foods containing high protein, so that the development of the intimacy. And be careful to keep the environment quiet, do not rush when changing the water.