Artificial culture of tropical fish in the north

Artificial culture of tropical fish in the north

1. The selection of varieties The water quality in the northern part is relatively hard. The selection of a tropical species with a harder water quality is the key to successful breeding. After introducing, observing and demonstrating breeding, the varieties suitable for breeding and breeding in the water environment in the north mainly include black marmosets, moonfish, swordtail fish and guppies, etc. of the oviparous family. There are zebrafish, scissors fish and red roses of the family Polygonaceae. Etc. Angelfish, map fish, sapphire, ruby, terrestrial leopard, leopard, thrush, etc. of the cichlid family; blue manlong, kissing fish, rabbit fish, spotted clam, etc. Scorpio scavenger, squirrelfish, etc.; there are dozens of species such as red dragon, silver dragon, and star-spotted arowana.

In addition to considering the adaptability to water quality environment, the selection of varieties also depends on the market's demand for varieties. The tropical fish in the north are sold to the areas and exports of the Three North (northeast, north, northwest) regions. The opportunities for export after the country’s passing away are increasing. Investigating and understanding the future demand for tropical fish species in domestic and foreign markets is the basis for the introduction of varieties and economic benefits. Foundation. The ever-changing market demands, the tracking of market demand and the understanding of market development, and the timely availability of domestic and foreign market demand information, are important tasks for the specialized farmers in the aquaculture industry in the future. For the new farmers, generally choose several major varieties as breeding scale breeding species, at the same time, select several breeding species for the market development situation, adjust the varieties according to the market and breeding environment each year, introduce the varieties with promising market prospects, and expand the marketability Road breed breeding scale. To avoid a single culture of the species, in the event of disease or poor sales, a single species will cause great losses, resulting in failure of aquaculture operations.

2. Care of larvae The larvae of large tropical fish species grow faster, and the larvae of small tropical fish species grow more slowly. The feeding time of yolk gray water after larvae have been eaten varies from species to species, and the feeding time of red and green light fish is more than half a month. The species of Polygonidae, Quercusidae and Bettaidae are due to the individual minimum of broodstock. The growth rate of larvae is very slow. According to various developmental stages of larvae, the larvae are to be screened by dividing the yolk gray water into mesh nets of 100 mesh, 150 mesh, and 200 mesh with different specifications. The size of the larvae can then be fed separately. According to the growth of larvae, they generally follow the order of feeding small to medium to large yolks and gradually overdosing the feeding of small fishes. For the oyster family of ovary, the larvae born to the broodstock can be directly fed with small fish and the effect is very good. For the species of the cichlid family, the individuals of the brood are larger and the larvae are larger, and the yolk gray water can be directly used. Feeding larvae, feeding time can be maintained for 4 - 5 days, individual larvae such as antler fish larger larvae, the larvae can be directly fed 50 mesh net with filtered fish, the effect is very good.
The amount of larva feed should be determined by the larval species, appetite status, activity, and growth rate. Usually 4- or 5-times a day, use a spoon to spread the concentrated egg yolk ash solution evenly in the larval fish tank or in the fish pond. Observe the larvae after feeding. For example, if the abdomen is swollen with egg yolk, there is no residual bait in the water, and the water quality is still fresh and transparent. It means that the amount of bait is just right. If there is residual bait in the water, the water quality is easily deteriorated and the water quality should be treated in time. For some small species such as lampfish, lilies, glass larvae, etc., the individual larvae are limited in their range of activities and have weak foraging ability. They can adopt more feeding methods and reduce the amount of each feeding. There is a certain amount of live egg yolk grey water in the water to ensure that they can eat the bait.

3, the cultivation of juvenile larvae after 4-5 weeks of feeding, has developed into a juvenile fish with adult fish characteristics, increased appetite and appetite, its bait and adult fish food the same. The growth speed of rope ladders and bones is the fastest stage in tropical fish life. Generally, after 3 to 5 months of feeding juveniles, they can grow into adult fishes.
The rearing density of juveniles must be constantly adjusted, and the density of small juveniles can be larger when the individuals are small. After entering the juvenile period, the space in the fish tanks will feel crowded. Generally, the fish tank of 10 cm x 50 cm x 50 cm is 100—500 tails. If the density is too high, it will result in lack of oxygen floating head, uneven feeding, water body turbidity and transparency decreased, fish body development will be hindered and slowed down, and there will be uneven development among individuals or injury of juvenile fish.

4. The number of feeding and managing juveniles should be increased with the increase of appetite. Feeding amount should be eaten within 10 to 20 minutes for each feeding fish, and it is a criterion to keep individual fish stocks full. The number of feedings is controlled 2-3 times a day. The feces color of the larvae after eating is digested normally by black or light gray. If white appears to indicate indigestion, the amount of bait should be reduced. Juvenile fish metabolites continue to increase, to constantly change the water to remove dirt, change the water with a plastic pipe from the bottom of the tank to remove dirt from the bottom of the cylinder, and then into the same temperature with the new nature of the water, slowly injected along the edge of the cylinder. Generally every 2 - 3 days will change the water once, until the late growth stage of juvenile fish should be changed every day, in order to stimulate the metabolism of juvenile fish, and promote the growth and development of juvenile fish. The juvenile fish need to use the same water for daily feeding as adult tropical fish. The water temperature can be controlled at about 25°C. The daily temperature difference should not exceed 2°C, and the temperature should not change from 1°C to -2°C in a short time. Rapid temperature changes can easily lead to illness and prevent the occurrence of hot and cold due to changes in water and other factors.

 

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