Common deep-sea fish are hairtail, yellow croaker, COD, sardines, sharks, whale, salmon, tuna, sea bass, saury, eel, Spanish mackerel, yellow croaker, Pomfret, mud carp, anchovies, mackerel and so on. We often eat deep-sea fish, offshore fish, cold-water fish such as Norwegian salmon is cold-water fish. Deep-sea pollution is less, deep-sea fish mostly grow naturally, cold-water fish grow for a long time, so it has more nutritional value. 1. Deep-sea fish are good for human body. They usually refer to the fish of 600-2700 meters below sea level. Their flesh is white, delicate, tender and delicious. They are pollution-free, low-fat and high-protein green food. Their nutrients and contents are more complete and abundant than ordinary fish. Scientists have found that the benefits of deep-sea fish to the human body are manifested in various aspects, such as wrinkle-removing and facial-nourishing; the active ion calcium is easily absorbed by the human body; it contains a large amount of vitamin E, vitamin C and carotene, which can inhibit the activity of self-reliance (which can destroy fundamental genetic materials, cell walls, cause cancer and heart disease), thereby strengthening the human immunity and prevention. Aging and youth. Deep-sea fish is the best food. Because of its high nutritional value, the nutrients DHA and EPA in deep-sea fish are very high, which can help the development of baby's brain and vision, and the content of protein and calcium is also high, which is very beneficial to the human body.

　　二、对儿童补铁的选择深海鱼富含DHA(二十二碳六烯酸)和EPA(二十碳五烯酸)。DHA有“脑黄金”之称，具有活化脑细胞的聪明因子，使得脑部的神经传导物质能比拟容易去传达正确的信息，促进、谐和神经回路传导作用，以维持脑部细胞的正常运作。它不但对儿童的脑发育起着十分重要的作用，还可进步视网膜的反射才能，强化和改善视力。很多孩子需求补铁，通常都说菠菜补铁，但是让孩子吃菠菜补铁，只能是越吃越缺铁，由于菠菜中的草酸、鞣酸都会抑止铁的吸收，此外补铁食材还有猪肝，里面含有丰厚的铁质，但多食动物肝脏容易堆积毒素，也不宜长期大量食用。因而，孩子补铁的选择是深海鱼类，其次肉、蛋中含的铁质较为容易被吸收应用。

　　2. The best choice of iron supplementation for children is that deep-sea fish are rich in DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid). DHA is known as "brain gold". It has intelligent factors to activate brain cells, which make it easier for nerve conducting substances in the brain to convey the correct information, promote, harmonize and nerve circuit conduction, so as to maintain the normal operation of brain cells. It not only plays a very important role in children's brain development, but also improves the retinal reflex ability, and strengthens and improves vision. Many children need iron supplement, usually say spinach iron supplement, but let children eat spinach iron supplement, can only eat more iron deficiency, because the oxalic acid in spinach, tannic acid will inhibit the absorption of iron, in addition to iron supplements and pig liver, which contains rich iron, but eat animal liver is easy to accumulate toxins, it is not suitable for long-term consumption. Therefore, the best choice of iron supplementation for children is deep-sea fish, followed by iron in meat and eggs, which is more easily absorbed and applied.