Bullet fish is also known as flower jumping, jumping fish, mud monkeys. It belongs to the pupa-shaped head, Bombyxidae. There are 3 genera and 9 species in China. The common species are mudskipper fish, big-shot bluefish, and green-coated fish.

(A) Biology of Bullfish

1. Morphological characteristics Bombed fish is long and flat. The eye is located at the front of the head and protrudes from the top of the head. The two eyes are close and the abdomen mostly heals. The base of the pectoral fin is long and full of muscles, so it can jump out of the water.

2. Life habits Bombyx mori is a warm, temperate small-scale fish. Body length is generally about 150MM, the majority is about 100mm. Inhabits on coastal mudflats or in salty freshwater, with shallow shoals and rocks on sandy beaches or low tides

Crawling, good at jumping, hence the name bomber fish. Usually on the muddy beach, when you are frightened, you can quickly jump into the water or drill into the cave to avoid the damage.

Because the pike-coated fish can use the pectoral and caudal peduncles to crawl or jump on the water, mudflats, and rocks, and the skin and tail are assisted respirator, they can expose the water surface for a longer time and live. The tolerance to harsh water environment is higher than that of ordinary fish.

The class is strong. The mudskipper has a habit of digging a drill hole like a yellow toad and has at least two holes. One is a positive orifice, which is the main access channel; the other is a rear orifice, which allows the flow and air to flow freely. This channel is in the shape of a “丫”.

The lower part of the "丫"-shaped cave and the painted surface are flat. The depth and depth of the channel varies with the nature of the underlying soil. The soft mud layer is thick and the hole is deep and long, about 60 cm. The tunnel can also be used as spawning room in addition to avoiding changes in the enemy and refuge environment.

Bullet fish are suitable for seawater density between 1.010 and 1.020. Water temperature 24-30°C grows quickly. When the water temperature is above 32°C in summer, you can use a pergola around the pool to shelter it from the heat. It hides below 14 °C in winter

In the hole. Few activities come out. There is good weather in the sun. Even during the winter, feeding activities come out.

The mudskipper fish mainly feed on benthic diatoms. It is common to see benthic diatoms feeding at the bottom of shallow banks and drainage channels during low tide. When the body is dried in the sun, it slips into the water and then swims through the water

Diatoms.

3. Breeding habits of the euphorbia fish. Due to the large proportion of the liver of the eel-bearing fish, the mature male and female abdomen are large in appearance, so it is not easy to distinguish gender, the only way is to carefully observe the gonad. If reproductive

The hole is red and swollen and the female is round, and the narrow elongated male tip is pointed. The ovaries are yellow and the eggs are sticky eggs. Two testis, pale red, on both sides of the abdomen.

(II) Increased culture

1. The breeding season of mudflated fish is from April to September. The natural fish fry catches most frequently in June and August, especially after the high tide in early summer. The estuary in the estuary enters the sea, in the water pool and the water digging in the foot prints. In, with

Small hand-operated nets to take 1.5 ~ 3cm long seedlings.

2. Aquaculture pond

(1) Area Each breeding pond is suitable for 1.5 to 15 mu, generally 7 to 8 mu, which is too inconvenient for management and it is difficult to put seedlings at one time. Too little is not conducive to the growth of slugs. Area yield is not high.

(2) The pool embankment and sediment are similar to the shrimp ponds, and the bottom of the pond should be higher than the low tide line and be flat so that benthic diatoms can be cultivated and sunbed. Each pool is equipped with a drainage gate and the bottom of the pool must be slightly inclined towards the gate and

There is a deep trench about 2 meters wide connecting the gate for drainage. The bottom soil is preferably made of softer clay, which is beneficial to its habitation of habitat and algae propagation. Secondly, the pool embankment should be higher, or a fence or other anti-escape facilities should be installed to prevent

Its escape and invasion of other animals.

3. Before preparation for stocking, the mudskippers mainly feed on benthic diatoms, followed by blue-green algae. They do not eat rice bran, soybean cakes, peanut cakes, and fish slurry feed directly. There is no residual food. Only the good growth of algae can make the bullet coating.

The fish grow well, so how to make the ground conducive to the growth and reproduction of algae is a problem that farmers need to solve. Therefore, before the stocking, it is necessary to do a clean pool operation such as drying the pool bottom, applying basic fertilizer, disinfecting, and eliminating enemy damage. For old fish and shrimp ponds that have been cultivated for a long time and have many organic matters, the amount of base fertilizer to be applied should be small, and it should be exposed after being exposed to cracks. Rice bran, water 5 to 10cm can be stocked. The newly built fish ponds will use chickens, pig manure and rice bran about 40 kilograms per acre, and the water depth should be 2-7 cm.

4. The seedlings that have been stocked or purchased are directly placed in the rearing tanks for a period of up to 5–10 cm for rapid growth, and growth above 30 cm is slow. Breeding time is generally about 8 months, due to the growth of mudskipper fish, there are drilling caves

Habitual habits, it is not easy to capture, it is difficult to segregate after stocking. Although mudskipper fish have no killing phenomenon, they can be stocked one after another, but it is better to let them go in a short time. The stocking capacity per acre is generally between 2000 and 3500, and the high-density stocking

The supply of algae in the pond will not be able to supply, but its growth will be slow. This will eventually lead to the consequences of small individual specifications, low prices, high costs, unsatisfactory yields and low benefits.

5. Daily management

(1) Fertilization After feeding for a period of time, the benthic diatoms disappear and the water quality becomes turbid. They must be drained, sun bathed, and fertilized to promote the reproduction of benthic diatoms. Since the seedlings in the early stage of stocking were not deeply drilled, the water temperature was prevented from changing too much. Therefore, in the initial stage of stocking, the depth of the pool water is maintained at about 15 cm, and it is only deeper at the ditch, which is about 30 cm. The algae grew well and the eel was fed with enough bait. At this time, it was drilled shallowly in the tunnel. After about 40 days, when it grew to more than 5 cm, it began to build deeper channels. At this time, if the benthic diatoms disappear or decrease, they can choose to be sunny, drain the pool water, and only leave some water in the ditch. If the bottom of the ditches is 3 to 6 days, when the bottom of the pool is relatively hard, the sun will crack, and then the fertilizer can be applied. , rice sugar, etc., the amount of fertilizer is increased or decreased depending on the number of benthic diatoms. Ordinary rice bran is about 20 kilograms per acre. The retracted fabric should be fully and evenly distributed. After the drainage, the bottom of the pool is still wet and soft, and the effect of spreading is good, so that rice bran and soil When the surface is moistened and joined together, and then sun cracked, it begins to inject seawater approximately 3 to 10 cm. In a few days, adherent diatoms will continue to flourish. When manure or fertilizer is applied, do not allow a large amount of liquid manure to directly flow into the tunnel and kill the fish. Water fertilizer or manure can be directly poured on the surface of the cracked subsoil. It can also be mixed and diluted after entering the water, so it will not stimulate the fish in the hole.

(2) Insulation In winter, in order to increase the pool temperature, when the weather is clear and free from wind and waves, the pool must be drained. In case of cold and cold winter, the water injection can be more, and more water can be kept. When the water temperature falls below 14°C, the mudflater has burrowed. Less out

food.

(3) Injury

1 Fish damage Some fishes will prey on the seedlings of shellfish. For example, jellyfish and sand flies will prey on stocking seedlings, which will reduce their survival rate. Therefore, they must be exterminated during sun drying. It should be prevented from invading the culture pond every time it enters the water.

2 Bird-fighting is generally driven by eviction. There is no absolute prevention at present.

3 Crab damage small crabs like shellfish fish. Bullet fish sometimes stray into the crab hole and are caught and eaten. Small crabs also invade the smeared fish hole and kill the smeared fish for food. The pool is surrounded by plastic plates to prevent small crabs from entering. In the pool

The crab was poured into the hole with a high concentration of poison when draining the sun bath, sealed and poisoned at its mouth, or killed with light in the evening.

4 Others, such as conch, polychaete, etc., although they do not directly harm the smeared fish, they can ingest large amounts of algae and compete with eel-fishing fish to try to get rid of them. The snail must apply 0.35ppm shellfish killer before stocking. Hairy insects, polychaetes and other available drugs were used to disperse the entire pool of water.

(III) Harvesting and Living Appropriate Sale

1. The size of the bombarded fish is 25 pieces per 500 g and can be listed. There are two different ways to catch a smear fish:

(1) The ballistic cages trap and drain the pool water, leaving only the water in the central ditch, and then look for imports and exports. There are traces of access to the import, but there is no such trace at the exit. The soil was plugged into the exit, and the entrance was slightly controlled to a wider hole. The fish cage was then plugged in and marked. The bullet-coated fish could only come out of the unsealed inlet into the cage. Harvest about once every half hour, then change to a new orifice.

(2) The method of hanging nets; this method can be used in other seasons except for winters. Using the water-repelling habits of the mudskipper fish, first drain the pool water to a few centimeters or dry it, and then set the hanging net to the water inlet to use the water injection at high tide.

When the water-recovery cluster is in the hanging net, the net rope is lifted and captured.

2. The smear-coating of live fish with mud-coated fish is easy. It can be transported long distances as long as the proper temperature is maintained and a small amount of water is added.

Some traffickers used a special round sac sieve tray with a diameter of 80 cm and a depth of 20 cm. A plastic film was laid on the bottom of the sieve pan. The circumference of the stencil was larger than the bottom and the membrane edge was affixed to the sifter wall. After the shellfish were put in, a small amount of water was added and several sifting sieve trays were stacked. After the fish is packed, carry-on baggage can be handled at the bus passenger station. The survival rate of transportation 2 to 3 days can reach 100%.

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