藍鯨背脊呈淺藍色，肚皮布滿褶皺，帶有赭石色黃斑。它的尾巴寬闊平扁，能在水中自由靈活地擺動，既是前進的動力，也起著方向舵的作用，時數可達27公裏。藍鯨捕食方式屬“吞食型”，主要食物是小蝦、水母、矽藻等浮遊生物。它常在水面張開血盆大口，把蝦和海水壹起吞入口中，接著閉嘴濾出海水，把小蝦吞進腹內。壹頭藍鯨每天要吃約4噸重的小磷蝦。
如果它肚中的食物少於2噸，它就回餓得發慌，好像是永遠吃不飽似的。所以它經常潛入水深三四十米處，搜尋食物。由於長時間待在水中，每次浮上海面換氣時，會從鼻孔內噴射出高達15米左右的水柱，遠遠望去，宛如壹股清泉。藍鯨的力氣很大，大約相當於壹臺中型火車頭的拉力。
藍鯨在冬季繁殖。母鯨懷胎壹年後才生小鯨。剛產下的幼鯨體長就有7.5米左右，重約6噸，經過24小時的餵奶，它的體重就能增加100公斤左右，平均每分鐘增加約75克。幼鯨經過7個月的哺乳後，體重可達23噸左右，體長約16米，並開始學著張嘴吞食各種浮遊生物。小藍鯨要到5歲才算成年，它的壽命約為20-30年。
藍鯨渾身是寶，它的脂肪可制肥皂；鯨肉營養豐富；鯨骨可提煉膠水；鯨肝含有大量的維生素；血和內器官又是優質肥料。因此，藍鯨屢遭人類的肆意捕殺。現在，藍鯨的數量正急劇下降，幾乎到了瀕臨毀滅的境地。
藍鯨 is in the world the biggest mammal, proliferates the global various oceans sea area. Its height may amount to about 30 meters, body weight approximately 170 tons, as soon as opens mouth may open to accommodates 10 adults free turnover the width.
藍鯨 the back assumes light blue, the belly covers entirely the fold, has 赭石色 the yellow spot. Its tail broad even is flat, can freely nimbly swing in the water, since advance power, also plays the rudder role, 時數 may amount to 27 kilometers. 藍鯨 preys on the way to be "swallowing", main food is the small shrimp, the jellyfish, the diatom and so on the plankton. It often opens the big mouth in the water surface, swallows together the shrimp and the sea water in the entrance, then shuts up filters out the sea water, swallows the small shrimp the endo-abdominal. 藍鯨 must eat approximately 4 ton heavy small krill every day.
If in its stomach food is short to 2 tons, it returns is hungry forever feels nervous, looks like is cannot eat to the full resembles. Therefore it frequently dives into the water depth 340 meters place, search food. Because the long time treats in the water, each time floats when the sea level takes a breath, can from the nostril spray reaches as high as 15 meter about water column, looks by far, just like 清泉. 藍鯨 the strength is very big, probably is equal to a Taichung railway engine pulling force.
藍鯨 in winter reproduction. After the female whale is for pregnant a year only then to live 小鯨. Just gave birth the young whale body long had about 7.5 meters, the heavy approximately 6 tons, passed through 24 hours nursing, its body weight could increase about 100 kilograms, average each minute increase approximately 75 grams. After the young whale passes through 7 month-long nursing, the body weight may amount to about 23 tons, the body long approximately 16 meters, and start to study are opening mouth swallow each kind of plankton. Small 藍鯨 must calculate grown-up to 5 year old of talent, its life approximately is 20-30 year.
藍鯨 the whole body is valuable, its fat may make the soap; The whale meat nutrition is rich; The whale bone may refine the glue water; The whale liver includes the massive vitamins; The blood and in the organ also is the high quality fertilizer. Therefore, 藍鯨 repeatedly suffers the humanity recklessly to capture and kill. Now, 藍鯨 the quantity suddenly is dropping, nearly arrived has bordered on the deconstruction the region.