As many marine aquarium hobbyists have discovered, adding “just one more fish” to an already-established community can, on occasion, be surprisingly problematic. In some instances, every new specimen that’s added lives only a short time, either succumbing to some unknown malady or finding some little gap in the cover to jump through and ending up as “fish jerky” on the floor.
当出现这种情况时，自然的倾向应归咎于鱼类的来源 - 经销商 - 不给予适当的护理，或者我们将异常死亡归因于氰化物中毒或其他神秘因素以外的其他神秘因素。我们假设问题的根源不能在我们自己的系统中，因为如果是，那么至少一些已建立的鱼也会显示出疾病或困扰的迹象。
So, we keep buying and replacing specimens, ever in pursuit of that one exceptional dealer who doesn’t sell “bad livestock.” However, more often than we’d like to admit, the root of this dilemma is actually right there under our noses—in our own systems—and it’s incumbent upon us to identify the problem and make necessary corrections.
Before blaming your dealer for selling bad fish, consider the following possibilities:
One more fish is one too many
The tank could already be maxed out with respect to bioload, so adding one more specimen tips the biofilter out of balance, resulting in an ammonia spike that claims the stressed-out newcomer first.
Pecking order violation
任何既定的鱼类社区都将有至少一定程度的啄食令。请记住，介绍的顺序很重要！如果街区上的新鱼本质上比一个或多个既定标本更宁静，那么新来者可能是针对攻击的。然后，不断冲突的压力会使新来者生病或导致其努力逃避折磨者。
Parameter drift
If an important water parameter, such asph, specific gravity, temperature, or the nitrate level, is allowed to drift out of the desired range over time, the resident fish population may be able to acclimate to the gradual change with no obvious signs of ill health. However, the adjustment to suboptimal water conditions may prove to be too much for a new fish that’s already stressed from being netted and transferred.
No resistance
Similarly, it can happen that there is a pathogen or parasite in the system to which the resident fish have developed immunity but against which the newcomer has no resistance.
Poor choice of species
在许多情况下，新鱼仅仅是因为业余爱好者一遍又一遍地做出同样的不良库存决定，而众所周知，众所周知，众所周知，这物种很难被囚禁，或者需要比业余爱好者更需要更高的专业知识和奉献精神能够或愿意提供。
您的经验是什么？
So, fellow salties, what have we missed on this list? Have you ever experienced anomalous deaths when trying to introduce new fish to an established community? If so, what proved to be the cause and how did you resolve the problem? Let us know in the comment section below.
