从凶猛的大白鲨（Carcharodon Carcharias) to the graceful white-spotted eagle ray (Aetobatus narinari），Elasmobranchii是一群多样的无骨鱼类，它们是世界海洋和河流中各种各样的栖息地，温度范围，盐度和利基市场。
难怪这些独特的生物虽然与典型的Teleef礁鱼相比，通常具有相对平淡的色彩，但几乎每个业余爱好者都感兴趣。这群鱼确实面临着挑战，但是，有了适当的信息和物种的选择，可以通过富裕的预算熟练的水族馆很容易保留。
Another elasmobranch curveball
So your system is all coming together. You have the appropriate space and the ability to provide appropriate food and nutrition. But elasmobranchs throw another curveball at aquarists. As with a messy two-year-old, their waste and leftover food are a concern that must be addressed by providing good filtration for an elasmobranch system.
挖掘出
It starts with the source water. Reverse-osmosis, de-ionized (RO/DI) water is definitely a great tool in this aspect, but not always necessary depending on your tap water. Be mindful of nitrate, phosphate, nickel, and copper in your source water, as these compounds can cause issues for elasmobranchs. It usually is a good idea to use a quality RO/DI unit to keep these values to a minimum. A TDS (Total Dissolved Solids) meter can be employed to ensure that the unit is working properly.
与旧的，新的！
With good-quality source water secured, keeping the water clean in the tank becomes the focus. Usually a tank, pool, or pond of substantial size is used to house elasmobranchs. This demands a unique take on filtration:
冗余泵
一个大型泵进行良好的营业额对于运行所有这些过滤非常重要。我通常喜欢使用两个主泵 - 一个作为主泵，另一个作为备用泵，因为弹跳系统中所有流量的故障可能意味着坦克撞车的速度比人们想象的要快。我建议使用10倍或更多的营业额，以适当的氧合和二氧化碳脱气。
Mechanical filtration
A tank dedicated to elasmobranchs generally relies on mechanical filtration to a比礁系统要大得多does. Capturing waste and removing it quickly before it can rot is the focal point of a good filtration system for sharks and rays.
大多数大型系统都采用用于游泳池设计的沙子或珠滤波器来提供机械过滤。唯一的缺点是，他们需要经常进行反冲洗才能在腐烂之前清除碎屑，如果不计划在换水周围，这可能会浪费一些水。
Unnecessary saltwater use can be avoided if a freshwater line can be plumbed into the sand filter. The freshwater line is used for the main backwash, and then you switch to system water. This means that only the end of the backwash is salt water but the detritus is properly flushed out of the system.
超大的撇渣器
超大号蛋白质撇油器帮助机械清除较小的碎屑，使其经过沙子过滤器，从而减少了系统内的硝酸盐生产。另一个好处是，它还可以增加系统内的氧合，这对于大型弹性分支非常重要。如果您愿意花这笔钱，则可以依靠一个极大的分馏器来执行大部分机械过滤，而不是砂过滤器。
生物过滤
还应采用一些生物过滤，因为大多数射线和鲨鱼罐通常具有最小的活岩石以进行细菌过程。装有生物媒体（例如生物呼叫）的生物毒牙是有效的，可以在砂过滤器后内联。
藻类在工作中
Large refugia or vegetable filters can also work well for nitrate reduction.Chaetomorphais a great choice for arefugium, and turf algae scrubbers are also efficient at removing nitrates and phosphates from the system, making algae within the tank or pool less prevalent.
化学过滤
If refugia cannot be used due to space constraints, the binding of heavy metals and the removal of phosphates and nitrates can be achieved with chemical filtration. At the very least, a small amount of high quality carbon should be employed to remove impurities.
Plan and organize
最重要的是，您的过滤需要计划和组织。经过深思熟虑的系统应该易于维护。请记住：
- 混合盐水的桶应足够大，因此您始终有足够的盐水在短时间内进行大幅变化。
- 过滤系统的每个部分都应易于访问以进行适当的维护。
- 你的网友ld be able to bypass and replace every part of your filtration system in a fairly short amount of time.
All of these steps will ensure success with your new passion for keeping elasmobranchs.
See Part 1 of the Elasmobranch Enthusiasts series on水族馆的空间需要，第2部分饮食和适当的营养，第4部分再生产。
