Artificial propagation method of cobia

1. Artificial oxytocin should be selected from the broodstock, which has a large abdomen and reveals the outline of gonads. Oxygen production uses luteinizing hormone-releasing hormone analogues (LRH-A2), human chorionic gonadotropin (HCG), and domoxone (DOM), two injections in the pectoral fin base part of the broodstock, which accounts for 1/1 of the total 3, the second time accounts for 2/3 of the total. Some broodstocks with loose belly and obvious gonads are put into urine production ponds, and eco-stimulation methods are used to promote their natural spawning.
2. Incubation cobia fish eggs were round and slightly yellow, floating eggs, eggs of the fertilized eggs slightly water swelling, egg diameter 135 microns to 141 microns. Poor eggs are opaque and poorly buoyant and should be removed. The number of eggs per kilogram is about 500,000. When the water temperature is between 24°C and 26°C, the membrane can be hatched within 30 hours; when the water temperature is 28°C to 30°C, the membrane hatches within about 24 hours.
3. Larval larvae Newly hatched larvae are quite large in size compared to other marine fish. The overall length is about 3.5 mm. The body has melanin distribution. The oil globules are below the yolk sac and the fins are translucent. The fins are suspended at rest. In water, the abdomen faces upwards and is horizontal or inclined. At 12 hours after membrane rupture, the larvae were 4 mm in length and about 4.8 mm in length in 24 hours. The larvae were dark brown in color, with a silvery yellow color beginning from the back of the head to the tail. Occasionally, the larvae rushed for a short and anxious swim. , mainly suspended in water. The third day old larvae had a total length of 6 mm, a mouth width of about 0.4 mm, a large mouth, brown pigmentation around the spine, a dark brown trunk, and a slightly silvery tail. From day 3, that is, 60 to 66 hours after membrane rupture, the larvae started feeding.

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