水母的習性??

Jellyfish are marine invertebrates belonging to the Scyphozoan class. The body of an adult jellyfish is composed of a bell-shaped, jelly producing substance enclosing its internal structure, from which the creature's tentacles are suspended. Each tentacle is covered with stinging cells (cnidocytes) that can sting or kill other animals: most jellyfish use them to secure prey or as a defense mechanism. Others, such as Rhizostomae, do not have tentacles at all. To compensate for its lack of basic sensory organs and a brain, the jellyfish exploits its nervous system and rhopalia to perceive stimuli, such as light or odor, and orchestrate expedient responses. In its adult form, it is composed of 94–98% water and can be found in every ocean in the world. Most jellyfish are passive drifters that feed on small fish and zooplankton that become caught in their tentacles. Jellyfish have an incomplete digestive system, meaning that the same orifice is used for both food intake and waste expulsion. They are made up of a layer of epidermis, gastrodermis, and a thick layer called mesoglea that produces most of the jelly and separates the epidermis from the gastrodermis.
Their shape is not hydrodynamic, which makes them slow swimmers but this is little hindrance as they feed on plankton, needing only to drift slowly through the water. It is more important for them that their movements create a current where the water (which contains their food) is being forced within reach of their tentacles. They accomplish this by rhythmically opening and closing their bell-like body.
Since jellyfish do not biologically qualify as actual "fish", the term "jellyfish" is considered a misnomer by some, who instead employ the names "jellies" or "sea jellies". The name "jellyfish" is also often used to denote either Hydrozoa or the box jellyfish, Cubozoa. The class name Scyphozoa comes from the Greek word skyphos, denoting a kind of drinking cup and alluding to the cup shape of the animal.
For more details, pls click
http://en.wikipedia.org/wiki/Jellyfish

寒天質的生物，一般稱為水母，一般被視為水母的種類多為刺胞動物門下的水蜆,
蟲綱，立方水母綱，花蟲綱，以及有櫛動物門的有觸手綱。
一般市面上常見半透明的水母俗稱學名：Aurelia auriea，中名：海月水母。
分佈於世界各大洋溫水域到暖水域，為腔腸動物。身體是膠質，含近98%的水份。飼養上另外.........
需注意水中不要產生氣泡或水流量太強。
飼養水母以一般天然海水即可。豐年蝦必須至市面上購買[豐年蝦卵]自行以海水孵化。
飼養任何生物都必須瞭解牠們的習性，並有足夠的飼育設備，而不是僅憑一時興起。
目前市面上流行的海月水母，在完備的飼養條件下，可有將近一年的壽命。
水母的分布:
水母生活在所有水域，包括淡水。

水母的壽命:
小水母的壽命不超過2-3個月，Peiagia屬及海月水母屬壽命不超過一年，
而大水母目前我們的瞭解卻仍然有限。
一般小型水母壽命都不長。市面上常見的無毒水母為球型水母。
　
水母的食性:
水母大多棲息於溫暖的淺水海域，飼養時以恆溫較佳。水母會
在白天光合作用結束時至海水表面進食浮游植物，飼育上食物來
源較為困難；肉食型則於晚上8-12時才開始覓食，可以餵食孵化
出的豐年蝦。
有的身體沒有刺胞，但是身體側面有成列櫛枝，是屬於櫛水母
類，屬於外洋性，利用波動而游動，吞食大動物運動時會產生紅色
螢光。 由於水母與腔腸動物一樣有毒刺細胞，因此除了水母魚外，並
不適合與其他魚類飼養在一起。
　
水母的生殖 :
水母基本上有無性生殖及有性生殖兩種類型，無性生殖為出芽生殖，而有
性生殖會分為固著的水螅期及漂浮的水母期。
www.kkes.tc.edu.tw/~student10/new_page_2.htm

Jellyfish are marine invertebrates belonging to the Scyphozoan class. The body of an adult jellyfish is composed of a bell-shaped, jelly producing substance enclosing its internal structure, from which the creature's tentacles are suspended. Each tentacle is covered with stinging cells (cnidocytes) that can sting or kill other animals: most jellyfish use them to secure prey or as a defense mechanism. Others, such as Rhizostomae, do not have tentacles at all. To compensate for its lack of basic sensory organs and a brain, the jellyfish exploits its nervous system and rhopalia to perceive stimuli, such as light or odor, and orchestrate expedient responses. In its adult form, it is composed of 94–98% water and can be found in every ocean in the world. Most jellyfish are passive drifters that feed on small fish and zooplankton that become caught in their tentacles. Jellyfish have an incomplete digestive system, meaning that the same orifice is used for both food intake and waste expulsion. They are made up of a layer of epidermis, gastrodermis, and a thick layer called mesoglea that produces most of the jelly and separates the epidermis from the gastrodermis.

Their shape is not hydrodynamic, which makes them slow swimmers but this is little hindrance as they feed on plankton, needing only to drift slowly through the water. It is more important for them that their movements create a current where the water (which contains their food) is being forced within reach of their tentacles. They accomplish this by rhythmically opening and closing their bell-like body.

Since jellyfish do not biologically qualify as actual "fish", the term "jellyfish"; is considered a misnomer by some, who instead employ the names "jellies" or "sea jellies". The name "jellyfish"; is also often used to denote either Hydrozoa or the box jellyfish, Cubozoa. The class name Scyphozoa comes from the Greek word skyphos, denoting a kind of drinking cup and alluding to the cup shape of the animal.

For more details, pls click

http://en.wikipedia.org/wiki/Jellyfish