- Can They Stomach It?
The answer is no, they can’t really stomach anything because they don’t have one! Goldfish do not have stomachs. Instead, they have one long intestine. The different parts of the said long intestine are responsible for absorbing and digesting the food.
My guess is it’s because they don’t have enough space in their torsos for any more than that.
- 金魚真的會吃撐死嗎？
金魚屬於無胃魚，它們是雜食性的，由於沒有胃，消化功能全由腸道完成，因此擁有較長的腸道，但與陸生動物相當於體長5至6倍的腸道相比，無胃魚的腸道多為體長的2倍左右。 對無胃魚而言，在食道後部和腸道最前部之間有一個膨大部分，但卻不能算是胃，這個膨大部分只有貯存食物的功能，而不能分泌胃蛋白酶參與消化，因此消化能力較差。
- Where are Their Teeth?
Have you seen every single monster movie out there? A lot of these slimy crawly worm-like creatures have a ring of teeth at the back of their throats. Perhaps they are based on reality, because the goldfish’s teeth are located in the exact same spot!
Instead of being like other fish and most other animals, their teeth do not protrude from their gums. They sit at the back of their throat, which is where most of the “chewing’’ happens.
- 金魚有沒有牙齒？
仔細觀察我們水族箱裏的金魚或者錦鯉，你是否注意到它的嘴部，吞食餌料時沒有咀嚼，直接吞下。為什麼是這樣一種狀況呢？因為金魚的牙齒長在咽喉部位，叫咽喉齒。
長有咽喉齒是鯉科魚類的特點，在億萬年的進化過程中，上下顎的牙齒退化，而其下咽骨進化出咀嚼功能。咽喉齒的功能是切斷或壓碎食物，沒有撕咬的作用，而且深藏在咽喉部位，這就註定了這一類魚是相對溫和的。作為觀賞魚的金魚和錦鯉，因為使用咽喉齒進食，我們在餵食時就需要注意一些細節問題。比如較大塊的食物，體長較長的活餌等，儘量弄碎食物，活餌切段，以便於它們吞咽。
- It’s All in the Nose
Goldfish need a strong sense of smell as it’s imperative to their survival. They need to search for food through the depths of the waters and their noses lead the way. Our noses are linked to our mouths and respiratory system, but it’s not like that for the goldfish.
Their noses filter water in and out and the particles relay information to the goldfish’s smell receptors. Since their survival depends on their ability to locate food through their noses, one can argue their sense of smell is better than yours or mine!
- 金魚有沒有嗅覺？
金魚的鼻孔位於眼睛的前上方，左右各一。這是金魚的嗅覺器官，而非呼吸器官，只感覺水體中氣體物質的味道。金魚的嗅囊能感覺由食物所發生的氣味刺激，尋找食物，也能協助識別同種魚類和不同種魚體的氣味，避免受敵害侵擾，此外尚能借之辨別水質，進行回歸移動等。
- Bears aren’t the Only Hibernators
Goldfish thrive in warmer temperatures and face the harsh winters and freezing weather quite the same way bears do – by hibernating. If your goldfish are kept outside, you need to make sure they get plenty of oxygen.
Make sure the pond doesn’t freeze over in extreme weather, and maintain the pond all year round. These cute little fish do not consume food during this time and just float idling at the bottom of the tank (with their eyes open of course).
- 你聽說過嗎？金魚也冬眠
這是金魚與生俱來的生物本能，金魚開始進入冬眠，一般是在水溫低於10度（根據其他條件的差異有的需要低於5度）以後。秋冬交替之際，水溫變動較大，這時需要密切觀察水溫的變化以及魚兒的反應。
從秋季開始水溫就不斷下降，隨之金魚的進食量也會減少，行動變得遲緩。當然，這些變化都是受氣溫影響一步步慢慢形成的。如果發現魚兒突然出現這些變化，很可能是得病了。當金魚待在水底開始停止進食，變得一動不動的時候，說明它們已經進入冬眠狀態了。
- Goldfish Memory
You have definitely heard of scatter-brained people being accused of having a goldfish memory. Next time someone makes fun of you or someone you know, you can give them this little tidbit of knowledge: it’s an unfounded accusation.
It’s just not true and is a widely believed myth. We’re not too sure how this accusation came about, but Israeli scientists once conducted an experiment to disprove it.
Just like you would train a dog, they trained the fish to respond to the sound of a bell signaling dinnertime. The fish still remembered this trick five months later after being released into the sea!
- 金魚的記憶只有7秒？
早在52年前，也就是1965年，當化學開始介入神經生物學的時候，美國密歇根大學的研究人員做了一個關於金魚的電擊實驗。當時的科學家們發現，只要對金魚進行合理的訓練，這些金魚可以在長達1個月的時間裏記住並掌握躲避電擊的技巧。
在1988年的《大腦研究》中，歌德大學在法蘭克福進行的實驗也證明了金魚至少有三天的記憶能力。
一些大學和科普節目的最近研究表明，金魚不僅擁有長達至少三個月的長期記憶，而且可以辨識物品形狀，顏色和聲音。利用正強化機制的引導，金魚能夠辨識出不同的光亮，被訓練後甚至可以完成一些把戲。
- Goldfish Change Color!
Goldfish adapt well to their environment and turn a ghostly white when sunlight exposure is limited. It sounds quite beautiful and cool but we’re not too sure how healthy that is.
This phenomenon happens because the sunlight is what helps goldfish produce pigments on their skin (scales). Without it, they turn a milky white. Since they have no pigments, these white goldfish are susceptible to UV rays.
- 金魚是「變色龍」
金魚在其一生會發生數次變色，隨着身體發育過程，逐漸發生着改變，常常會引起初學養魚者的困惑。其實金魚的這種變色現象，很久以前就被人發現，那麼金魚的這種變色現象究竟是和原因呢？
金魚的始祖是鯽魚，鯽魚和其他一般魚類一樣，並沒有十分鮮艷的色彩，而且自然條件下，體色過於鮮艷，起不到生態保護色的作用，會被天敵發現，難以存活下來。而自然界中出現體色突變為紅（黃）顏色的鯽魚，為中國人發現後，認為上天所賜，寓意吉祥，人工飼養起來，不再參與自然界的競爭，使鮮艷的體色得以留存。金魚的顏色是由黑色素細胞、黃色素細胞、白色反光（鳥糞素）細胞、藍色反光細胞組成。當其中一種細胞排列密度大時，魚體即呈現此種色彩。不同色素所佔比例的不同，所組成的體色也各異。
金魚一生的體色會發生三次改變。第一階段魚苗時期的變色。第二階段幼魚時期的脫色。第三階段老齡時期的褪色。
- If They Fit, I Don’t Spit
Another rumor you may have heard is that goldfish will eat anything that fits into their mouths. In other words, they are not picky eaters in any sense. They believe if it’s small enough to eat, then it must be food.
Unfortunately, this logic also applies to their own eggs and children! If you are thinking about having tank mates for your goldfish, it’s advisable to search for buddies that are much larger in size.
- 金魚不挑食
金魚屬於雜食性的水族觀賞魚類，它們從不挑食，基本上什麼都會吃，比如我們往常吃的飯粒，水草，浮萍，還有面包的小碎屑，肉食還會吃蚯蚓，魚粉等等，它們相信，只要它足夠小可以食用，那麼它一定是食物。不幸的是，這種邏輯也適用於自己的卵和孩子！
- They Live – LONG
Getting a pet is a big commitment, and although they are less work than dogs, they could outlive you if you get them later in life. Some goldfish have been known to live over 40 years!
Of course, all this depends on proper care for the fish. Factors such as tank mates, tank conditions, water temperature, food, tank maintenance and more can contribute to the lifespan of your floating friend.
- 金魚的壽命
世界上，最長壽的金魚和錦鯉你能猜到他們都活了多少歲嗎？答案一定會讓你驚掉下巴，根據國外媒體的報道，世界上已經知曉最長的金魚，居然比狗狗活的歲數都要大，可是比壽命最長的狗狗還要長十幾歲！
狗狗（長壽記錄為30歲）但是和金魚一比，誰的壽命更長一些呢？很多人一定會選擇狗子，但真正的答案卻是金魚，據報道稱，金魚可以活到40歲左右，而最長壽命的金魚卻是活到了43歲的壽命！
