One, turbot body anomaly The turbot is similar to other flounder species. In the artificial nursery, a high proportion of anomalous body color fish often appears. The phenomenon of whitening of the pigment dysplasia of the eye side is mainly called “whiteningâ€. Sometimes dark brown pigment appears on the side of the eye and is called "blackening." Sometimes the two occur at the same time, and it is determined that the developmental stage of "albino" is about 8 mm to 10 mm in length for the larvae. According to the experience of nursery work in recent years, the following reasons are considered: (1) Large amount of water exchange, adequate oxygen, low ammonia nitrogen, and low rate of “whiteningâ€; (2) High DHA and EPA content in bait, “whitening The rate is low, so feeding rotifers and Artemia must be enhanced. Second, the effect of organ development on the survival rate of turbot Turbot turtle seedling cultivation survival rate is much lower than the gums, from the initial hatch larvae to 30mm juvenile fish, under normal circumstances, the survival rate of 5-10 %, the survival rate is more than 10-15%, in addition to the high and low survival rate and the egg quality, food quantity, quality, water quality conditions, there is an important reason - the opening of the mullet. We found in the artificial propagation of turbot, a considerable number of dead larvae, with abnormally developed pupa organs. We conducted a study on this issue and described the histological features of turbot organs. Below the water temperature of 14°C, the digestive canal of the newly hatched larvae of turbot showed a straight tube, which could not be discerned. On the 2nd day after hatching, the formation of earthworms began. On the 5th day after hatching, the fistula was observed and opened in the cardia; the organ was first inflated on the 8th day, and most of the larvae were filled with gas on the 19th day. . 1. The metamorphosis of the larvae and the deterioration of the pupa organs proceed almost at the same time. On the 25th day after the transformation, the epigastric cells of the zygomatic glands of the anterior tibia were degenerated, and only the epigastric glands of the abdomen were left. On the first 47 days of incubation, the epithelium of the air glands completely disappeared, and the larvae began to camp for benthic life. On the 63rd day, the pupa organs completely disappeared and the juveniles began to migrate to benthic life. Normal larval organs of turbot larvae are usually smaller, and moderate inflammation is also found in uninflated larvae. Axillary organs can be considered as an air cushion between the spine and stomach of the juvenile larvae of the turbot, providing a pressure that can be applied to the back as well as to the abdomen to ensure normal development of the larvae. Gingiva, during its entire life cycle, did not show pupa organs. Its planktonic larval stage was earlier, and about 30 days of age could be used to camp benthic life. At the age of more than 40 days, it is basically all transferred to benthic life, more than 20 days earlier than turbot. According to the observations on the practice of fish breeding and the results of previous studies, we concluded that: (1) The development of abnormal organs can lead to the death of juvenile fish. The developmental abnormalities include two kinds of situations: one is that the turtle is not inflated and the other is There is no gas inside; (2) The helium is over-inflated, causing excessive expansion of the helium. The larvae that are not inflated in larvae with organs that are not inflated need more energy to catch bait, and they are more sensitive to stress, so the survival rate will be reduced. 2. Abnormal development of spastic organs leads to anterior curvature of the spine. We believe that the following measures can be taken to increase the opening rate of sputum: (1) Strengthen the intensive cultivation of broodstock and improve the quality of the egg (2) Control the aeration rate (3) Guarantee the feed quality of larvae (4) Remove oil film from water surface
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