Diseases

Recognising and preventing fish and invertebrate diseases

Are your aquarium fish ill? Are your aquarium fish showing disease symptoms? Would you like to diagnose aquarium fish diseases?

Why do aquarium fish get sick?

What factors influence fish health? What influence does fish food have on their susceptibility to disease? How can you protect the mucous membrane of the fish?

General information

About 90 % of all fish diseases can be put down to a weakening of the fish’s immune system. This means the application of remedies can fight the pathogen but doesn’t generally eliminate the cause. It is therefore very important to determine the cause. In most cases you can find the causes in the following areas:

New fish

Even when newly purchased fish do not show any obvious signs of illness, they still can be carriers of parasites or pathogen bacteria. It often happens that these “new” germs for the previous inhabitants are unknown so that they haven’t developed enough resistance to them. This situation is reminiscent of the Spanish conquest of South America, when they wiped out huge parts of the population with the cold viruses they brought with them! Please don’t always blame the pet shop retailer!

Expired food

The food has been open for more than three months. The vitamin content is then far too low. It is no long enough to build up any resistance.

As soon as the first signs of disease become noticeable IMMEDIATE action is required. In most cases people wait too long. Example: As soon as a “little spot” becomes visible, treatment must result. Waiting too long leads to that one little spot (white spot disease) coming off the skin, falling to the bottom and, after a capsule formation, releasing 1000 new spot pathogens, which increase the likelihood of infection to all the other aquarium inhabitants.

A word about cookies before we continue

The JBL Homepage also uses several types of cookies to provide you with full functionality and many services: We require technical and functional cookies to ensure that everything works when you visit this website. We also use cookies for marketing purposes. This ensures that we recognise you when you visit our extensive site again, that we can measure the success of our campaigns and that the personalisation cookies allow us to address you individually and directly, adapted to your needs - even outside our website. You can determine at any time - even at a later date - which cookies you allow and which you do not allow (more on this under "Change settings").

The JBL website uses several types of cookies to provide you with full functionality and many services: Technical and functional cookies are absolutely necessary so that everything works when you visit this website. In addition, we use cookies for marketing purposes. You can determine at any time - even at a later date - which cookies you allow and which you do not (more on this under "Change settings").

Our data protection declaration tells you how we process personal data and what purposes we use the data processing for. tells you how we process personal data and what purposes we use the data processing for. Please confirm the use of all cookies by clicking "Accept" - and you're on your way.

Are you over 16 years old? Then confirm the use of all cookies with "Noticed" and you are ready to go.

Choose your cookie settings

PUSH messages from JBL

What are PUSH messages? As part of the W3C standard, web notifications define an API for end-user notifications that are sent to the user's desktop and/or mobile devices via the browser. Notifications appear on the end devices as they are familiar to the end user from apps installed on the device (e.g. emails). Notifications appear on the end user’s device, just like an app (e.g. for emails) installed on the device.

These notifications enable a website operator to contact its users whenever they have a browser open - it doesn’t matter whether the user is currently visiting the website or not.

To be able to send web push notifications, all you need is a website with a web push code installed. This allows brands without apps to take advantage of many of the benefits of push notifications (personalised real-time communications at just the right moment).

Web notifications are part of the W3C standard and define an API for end user notifications. A notification makes it possible to inform the user about an event, such as a new blog post, outside the context of a website.

JBL GmbH & Co. KG provides this service free of charge, and it is easy to activate or deactivate.