Discharge of Cnidae

The capture of prey by anemones usually involves the use of cnidae to seize the prey. In most anemones thus far studied the cnidome (complement of cnidae) consists of only three types: spirocysts that are glutinant and hold the prey; microbasic p-mastigophores that penetrate and capture the prey; and b-mastigophores that are used both to penetrate and capture the prey and for defense (Shick, 1991; Mariscal, 1974b). Toxins injected into the prey also help to immobilize it.

The discharge of nematocysts is triggered by a structure called the ciliary cone complex, which is sensitive to mechanical and chemical stimuli. The structure consists of a nematocyte that contains j microvilli and a kinocillium, the former contributing mostly to chemical reception and the latter to mechanical reception. Additionally, cells around the central ciliary cone complex may also have microvilli. The microvilli can be imagined as being like taste buds on our tongues while the kinocillium is reminiscent of the hair cells in the vertebrate ear (Shick, 1991).

The COMPLETE guide to Aquariums

The COMPLETE guide to Aquariums

The word aquarium originates from the ancient Latin language, aqua meaning water and the suffix rium meaning place or building. Aquariums are beautiful and look good anywhere! Home aquariums are becoming more and more popular, it is a hobby that many people are flocking too and fish shops are on the rise. Fish are generally easy to keep although do they need quite a bit of attention. Puppies and kittens were the typical pet but now fish are becoming more and more frequent in house holds. In recent years fish shops have noticed a great increase in the rise of people wanting to purchase aquariums and fish, the boom has been great for local shops as the fish industry hasnt been such a great industry before now.

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