We often find the aquarium fish are sick, our first thought is what the drug under valid and effective if the fish medicines are effective, we are happy; if the fish medicines is invalid, then we will buy new fish. But few people would think of why fish get sick? What is our mistake? If we do not correct the error, the same thing will repeat itself over time. I think we need to learn is to focus on the cumulative experience of failure and correct our fish farming technology and ideas.

We want to know why the fish are sick, first we need to know the development process of fish sick, most follow a similar development process: fish due to reduced resistance to pathogens will be an opportunity, and thus fish pathogen resistance due to decrease again, More re-invasion of a large number of fish pathogen, causing fish kills.

It is a vicious cycle model, the general death of fish usually follow the same pattern, but in this model there are two problems, pathogens come from where? Why ornamental fish immunity down?

Whether it is the aquarium tank or outdoor ponds, we can say that this is a closed system. Because the water in the aquarium is not without sources, we have been changing the water, aquarium or pond to connect the external environment, so in a very large range in the aquarium can be artificially controlled environment, for example we can completely disinfect the aquarium , so that pathogenic disappear completely from the cylinder.

In the aquarium pathogens can generally be divided into viruses, bacteria, micro-bacteria, parasites etc. The aquarium fish are generally caused by viral infection of the disease, if we do not have sophisticated equipment, it is difficult to detect infection with lethal force is not able to , in addition to improving fish resistance, but also no other treatment, so do not elaborate, and then three types of sources because of the introduction of their unclean water, raw bait, and sick of fish caused by bacteria, although you can with micro air-borne bacteria, but in addition to fish off, in general, fans of the cylinder in the aquarium, can benefit from two adjacent cylinders chance of disease spread is too small, the general common carriers is the fish , especially parasites. With the fish pathogen, pathogens carried by the sick fish tank fish tank to the other, resulting in the spread of disease, regardless of bacteria, micro-bacteria, parasites, they make the fish sick, they must be in a certain number of tank because as the number of rare pathogen, a two parasites in the fish tank is has no function, but like bacteria, micro-bacteria although they grow very rapidly in water, but they grow to provide nutrients, that there is excess protein in the aquarium, that first there is poor water quality, only bacteria, micro-bacteria breeding environment. While the parasite, the environment they grow fish demand is weak, must first have a weak fish, they can multiply on its epiphytes, and then infect other fish.