鱼专家们教你怎么买鱼吃鱼

鱼的好处尽人皆知,中国营养学会建议,每人每天应吃50~100克鱼虾类食物。但是,鱼除了做法上的一些讲究外,从买到吃都有不少学问。本期,《生命时报》记者专访中国农业大学食品科学与营养 工程 路基工程安全技术交底工程项目施工成本控制工程量增项单年度零星工程技术标正投影法基本原理 学院水产品专家罗永康教授和上海海洋大学食品学院水产品加工及贮藏工程系主任陈舜胜教授,听听两位鱼专家的吃鱼守则。 个头挑“八分大”的。鱼的个头决定其口感和安全性。太小,鱼还没有长大成熟,肉质不够鲜嫩,鱼刺也会显得格外多。太大,意味着鱼的年龄老,肉质粗糙,体内可能积聚了不少有害物质。因此,买鱼选个头“八分大”左右的比较合适,例如,鲤鱼和武昌鱼以1斤半、鲫鱼0.5斤~1斤、草鱼4~5斤的为宜。 鱼眼浑浊塌陷、鱼鳃发灰的不买。选购“冰鲜鱼”,应该先观察其眼睛和鳃。新鲜鱼眼球饱满,角膜透明清亮,鳃丝清晰呈鲜红色;次鲜鱼眼球不饱满,眼角膜起皱,稍变浑浊,有时眼内溢血发红,鳃色变暗呈灰红或灰紫色;腐败鱼眼球塌陷或干瘪,角膜皱缩或有破裂,鱼鳃呈褐色或灰白色。 水箱内水的颜色不对不选。在超市购买活鱼时,要看看“水色”。因为它是水质好坏的体现,如果呈现深绿色或是蓝色,可能是藻类过多,说明很久没有换过水和清洗水箱了,可能会影响鱼的健康。水色清且流动更换的水箱中的鱼,一般会更鲜活。 价格太低的不买。价格低得离谱,就要考虑鱼的来源、品质和安全性问题,变质鱼吃下会带来很大的健康风险。 现杀活鱼放放再吃。刚宰杀后的鱼肉品质并不是最好的,因为鱼肉会有一个“排酸”过程,需要放置一段时间才更加鲜美。像草鱼、鲢鱼这样的小型鱼,应该立刻冷藏,2小时后再烹调;而大型鱼需要冷藏超过2小时。 鱼肉过红过白不吃。鱼因品种不同,本身就存在金枪鱼这样的红肉鱼和带鱼这样的白肉鱼之分,但如果鱼的颜色过于鲜红或呈亮白色,很有可能是染色剂的“功劳”。 腌制过的不吃。水产品中可能含有较多的亚硝酸盐,在干制或腌制过程中,其中的部分蛋白质发生分解,产生胺类,和亚硝酸盐结合成为亚硝胺,有一定的致癌风险。 生鱼片冷冻后再吃。生鱼片中可能会存在寄生虫,寄生虫对热和低温抵抗力很差,在零下20℃的条件下冷冻24小时后可被杀灭,而一般生鱼片餐盘下的冰块完全起不到杀灭寄生虫的作用。所以,只有对原料的来源足够放心,鱼才能生着吃。 尽量蒸着吃。在所有的烹调 方法 快递客服问题件处理详细方法山木方法pdf计算方法pdf华与华方法下载八字理论方法下载 中,蒸最为健康,烹调温度较低且用油少,能很好地保护鱼肉中绝大部分营养不被破坏;煮或炖,鱼中的有一部分营养可能会流失于汤水中;烧烤的温度较高,容易产生有害物质,并且烤鱼的用油量也不少,破坏了鱼低脂的健康特色;油炸含油量更高,对鱼营养破坏更大,也不建议选用。 Be known to all the benefits of fish, Chinese Nutrition Society recommended fish food,should eat 50~100 grams per person per day. However, fish except some exquisite outside in approach, there are a lot of knowledge from buy to eat. This period, "life times" reporter an exclusive interview with the China Agricultural University College of food science and nutritional engineering water product expert and Professor Luo Yongkang of Shanghai Ocean University College of food and aquatic product processing and storage engineering Dean Professor Chen Shunsheng, to hear the two fish eat fish code expert.www.jiuzhouwhly.com Head pick "eight points". The fish are decided its taste and safety. Is too small, the fishis not mature enough, fresh meat, fish bone will appear particularly. Too big, meanfish age old, fleshy rough, the body may accumulate a lot of harmful substances.Therefore, buy fish selected head "eight minute" around the more appropriate, for example, carp and Wuchang fish in 1 and a half pounds, 0.5 pounds of carp ~1 kg4~5 kg, Grass Carp advisable. Fisheye turbidity collapse, the gills of gray hair not to buy. Choose "ice fish", should be the first to observe the eyes and gills. Fresh fish eye cornea is transparent and clear, full, clear and bright red gill filaments; time fish eye is not full, the cornea of the eye wrinkle, slightly turbid, sometimes intraocular hemorrhage redness, gill darkeninggre yish red or grayish purple; corruption fish eyeball collapsing or dry, cornealshrinkage or rupture, gill brown or gray white. The water tank is the wrong color is not selected. In the supermarket to buy fresh fish,want to have a look "color". Because it is the embodiment of water quality, if appear dark green or blue algae, might be too much, that haven't changed the water and cleaning water tank, may affect fish health. Color clear and flowing of replacement offish in the tank, tend to be more vivid. The price is too low do not buy. Unrealistically low prices, it is necessary to consider the source of the fish, the quality and safety problems, metamorphic fish eat will bringserious health risks. We kill fish put more. Just after killing the fish quality is not the best, because the fishwill have a "acid" process, the need for a period of time before more delicious. LikeGrass Carp, silver carp small fish like this, should immediately refrigerated, after 2 hours of cooking; and large fish need cold for more than 2 hours. The fish had red over white eat. Fish for variety, in itself have a tuna fish and octopuslike red white meat fish of the points, but if the fish's color is red or bright white,possibly stain "credit". Do not eat salted. Nitrite may contain more water in the product, in dried or saltedprocess, part of the protein which decompose, produce amine, and nitrite combined into nitrosamines, a certain carcinogenic risk. www.rainbow-industrial.com Frozen after eating sashimi. There may be a parasite sashimi, parasites to heat andlow temperature resistance is poor, frozen below minus 20 DEG C conditions after 24 hours can be inactivated, and general sashimi plate under the ice completely notparasites. Therefore, only the source of material secure enough to eat raw fish. Try to eat steamed. In the cooking of all the methods, the most healthy for steaming,cooking temperature is low and less oil, can well protect the fish most nutrition has not been destroyed; boil or stew, fish has a part of nutrition may be lost in the soup water;high temperature roasting, easy to produce harmful substances, oil and fish also many, undermine the healthy low-fat fried fish special; higher oil content, greaterdamage on fish nutrition, do not recommend use. www.leader-fashions.com