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Frequently asked questions about our fish pass

For which areas of application is the Fishcon lock technology suitable?

From an economic point of view, the Fishcon lock is particularly suitable for heights from 1.5 m. With the standard versions, attraction flow rates of approx. 30 bis 600 l/s can be achieved and heights of max. 6 m can be overcome. Adaptations or special designs are possible for larger amounts of water or heights. In principle, a combination of several Fishcon locks or with conventional fish passes is also possible in order to overcome great heights, or a combination with the use of hydropower, for example to ensure to be easily found in large areas.

Which fish species have already used the Fishcon lock?

The migration of over 30 species of fish has already been demonstrated. That includes weak swimmers, sole-dwelling species and schooling fish.

Has a proof of function already been provided?

Yes, the functionality of both pilot plants could be verified by monitoring studies. The monitoring reports with the very positive and meaningful results can be requested from Fishcon.

How does the Fishcon lock work?

With the Fishcon lock, two lock chambers are combined in such a way that fish ascent and descent are possible at the same time, as well as simple operation with low water requirements.

The function for the fish is identical to that of a conventional fish lock. An ascending fish, for example, follows the guiding current from the downstream water into the chamber that is open to the downstream water. The fish can move freely in the entire chamber because it is always completely filled with water. Then the downstream slide gate of this chamber closes and the upstream slide gate opens. Guided by a new attraction flow, the fish can swim out of the chamber into the upstream water.

Detailed information on the function can be found on this website under “Fishcon pass”. If you have any questions, please feel free to contact Fishcon!

Can the Fishcon lock also be used to descend fish?

Yes, although the upstream waterway connection must be designed accordingly in order to enable the fish migrating downwards to be found.

The connection for the fish descent should, for example, be as close as possible to the main flow obstacle to migration. Fishcon will be happy to assist you in planning the optimal waterway connection.

How are the slide gates driven?

The slide gates can be moved with electric or hydraulic drives. The electric drives work with a supply voltage of 24 VDC or 230 VAC and are particularly suitable for small systems. For larger systems hydraulic drives are recommended in which the hydraulic unit has to be supplied with 400 VAC three-phase.

The energy requirement of the slide gates or the entire system is very low at a few 100 kWh/a.

What is the difference between the 2-chamber organism migration aid and the Fishcon's fish pass?

Fishcon’s fish pass is known by both names and provide the same technology. In the scientific field and in specialist literature, the name 2-chamber organism migration aid was mainly used until 2020. In marketing reasons, the name Fishcon fish pass is usually used.

How much work does maintenance involve?

The operating experience of the existing systems indicates a very low-maintenance operation because there are hardly any bottlenecks that could lead to a blockage. Nevertheless, it is recommended to design the surface water connection in such a way that no large amounts of floating or suspended matter are brought in. This can be achieved, for example, by means of an inlet slot element, a dip wall or a baffle screen.

In addition to regular visual inspections, it is recommended to inspect the system once or twice a year. For this purpose, the upper water basin has to be emptied, to look into the chambers. Such an inspection can be carried out in about an hour if the waterway connection is designed accordingly.

What happens when there is a flood?

The Fishcon lock can detect a flood by means of a float switch or an external input signal. The recommended upstream and downstream water basins can also be well protected by covers with, for example, press-locked grating. The Fishcon lock is designed in such a way that it can be completely overflowed apart from the control box. Rinsing is possible after the flood if larger amounts of bed load enter the basin despite the system shutdown.

What amount of water does the Fishcon lock require for operation?

The Fishcon lock can be operated with very small amounts of water, such as 40 l/s, as well as with staggered additions depending on the season or the inflow. The amount of attraction flow water required is heavily dependent on the size of the body of water and can be individually adapted to the location of the Fishcon lock.

In general, attraction water quantities of around 1-5% of the competing run-off are recommended in order to enable large-scale traceability with good design of the waterway connection. Fishcon will be happy to help with the design!

What does a Fishcon lock cost?

The prices of the Fishcon lock depend primarily on the length of the size-determining fish species at the location. Other small influences have the length of the lock, the height difference to be overcome and the specific design of the fish lock (with turbine or throttle …). We will be happy to estimate the costs for your location or send you an offer.

Is a turbine in the Fishcon lock profitable?

Yes, at locations with slightly higher heights and volumes of attraction water, economic operation is possible, and in some cases very profitable.

Slot pass, basin pass or Fishcon lock? Which solution is best for my location?

The choice of the right fish pass depends very much on the general conditions of the location. In the case of very small height differences, conventional fish passages can be the cheaper solution. The Fishcon lock is often advantageous for heights of approx. 1.5 m or more, because the costs and water requirements are usually lower, the system requires very little space and is insensitive to floods and fluctuating water levels.

Another great advantage is that the Fishcon lock, due to its compact design, creates an optimal connection for the fish descent and this can be implemented via the Fishcon lock.

How and where should the Fishcon lock best be installed?

For the Fishcon lock to function, an optimal water connection is of decisive importance. As with conventional fish passes, the connections should be as close as possible to the migration obstacle on the bank of the side with the main flow. In order to be able to dry out the system for maintenance purposes, it is advisable to provide a lockable basin before and after the Fishcon lock. The upstream connection should be designed in such a way that flotsam is kept away from the system. Fishcon will be happy to help you with the planning!

How big is the construction effort on site?

The construction costs depend heavily on the location. For simple locations, implementation is possible in a few days, as was the case, for example, with the Fishcon lock on the Aschacharm (construction time: 7 working days; construction costs: approx. € 12,000).

How long does it take to install the Fishcon lock?

Due to the prefabrication in the factory, on-site assembly is possible in one day.

General info

In which countries does Fishcon operate?

Fishcon is currently mainly active in German-speaking countries, but will soon also become active in other countries, especially in Europe.

What makes Fishcon a reliable partner?

Fishcon was founded in 2018 together with the company K. u. F. Drack GmbH & Co KG . Despite the so far brief company history, Fishcon has already been able to implement several publicly funded research and pilot projects to full satisfaction and also convince in a large number of competitions in which the company is also tested.

Due to the partnership with the company K. u.F. Drack GmbH & Co KG, Fishcon not only has a stable financial foundation, but can also access the expertise of the company with over 100 years of experience in the fields of hydraulic steel construction, electrical engineering and timber construction.

The close cooperation with the University of Natural Resources and Life Sciences in Vienna, the Technical University of Graz, the Upper Austrian Incubator Tech2b and various specialist organizations make Fishcon a reliable partner for your project!

Is it possible to do business with Fishcon?

A business cooperation is definitely of interest to Fishcon. Fishcon wants to build a network with partner companies from engineering offices, ecological offices and suppliers so that existing and new customers can also work with regional contact persons and project handling can be designed as simply and effectively as possible.
If you are interested in working with us, please do not hesitate to contact us!

Does Fishcon offer other products besides fish passes?

Yes! Fishcon is currently developing its own video monitoring system, which combines a weir with a lockable video evaluation area. The aim is to use the system to reduce the costs of monitoring.

Furthermore, a small power plant concept is being worked on, which can use larger amounts of water than the fish lock very cost-effectively, efficiently and reliably.

Detailed information on the two products can be requested!

What is the best way to contact Fishcon?

Feel free to contact us by telephone (+43 650 9401368) or by email ( We look forward to your questions and will try to answer them as quickly as possible!

Fish pass

Find out more about the technology, advantages and function of our patented 2-chamber organism bypass.

Reference systems

Our pilot systems have been awarded top marks. Find out more about our reference systems.