Event Title

Session D4: Evaluation of Upstream Migration at the Fish Lock Hollenstein (River Schwarzer Regen, Germany) Using a Simple Camera System

Location

Groningen, The Netherlands

Event Website

http://fishpassage.umass.edu/

Start Date

23-6-2015 11:35 AM

End Date

23-6-2015 11:50 AM

Description

Abstract:

The fish lock at the dam of the reservoir Höllensteinsee (river Schwarzer Regen, Germany) was built in 2013. The dam has a level difference of 13 m and is used for energy production. The fish lock was constructed in an old bottom outlet channel. The necessary dotation of 500 liters per second is energetically used by a micro turbine. In the year 2014 a monitoring was realized to proof the function of the fish lock for upstream fish migration. Because of the water depth it was not possible to install fyke nets, thereby a simple, economical system with four waterproof video cameras, IR-spotlights and a computer equipped with an observation software was used. The cameras were installed at upper and lower entrance of the lock. Over a period of 127 controlling days about 1400 fish of 12 species were sighted while leaving the upper entrance. Unfortunately the observation of the lower entrance showed a significant lack of entering the lock. Many fishes hesitated to enter the lock chamber or leave it again. Because of this, different parameters of the lock were changed: duration of the lock cycle (especially the duration of entering period), reduction of flow velocity in the lock chamber and installing a daylight spotlight within the chamber. Especially the illumination tends to result in higher passage rates. Also shorter entering periods of maximum 20 minutes show slight effects. The period to exit the chamber should take about 30 minutes, but most of the individuals leave the chamber within the first 3 minutes after opening the door. There is no evidence that the fish lock is used by a significant amount of downstream migrating fish. In spring 2015 the investigations will be continued to show more clearly the efficiency of the illumination and the duration of entrance period.

Comments

Presenting Author Bio: study of biology in Stuttgart and Jena scientific staff at the university in Jena and Weimar since 2000 scientific staff of "Hydrolaboratory Schleusingen" special interests: fish migration (up and downstream), effects of water power plants on fish, fish populations

This document is currently not available here.

Share

COinS
 
Jun 23rd, 11:35 AM Jun 23rd, 11:50 AM

Session D4: Evaluation of Upstream Migration at the Fish Lock Hollenstein (River Schwarzer Regen, Germany) Using a Simple Camera System

Groningen, The Netherlands

Abstract:

The fish lock at the dam of the reservoir Höllensteinsee (river Schwarzer Regen, Germany) was built in 2013. The dam has a level difference of 13 m and is used for energy production. The fish lock was constructed in an old bottom outlet channel. The necessary dotation of 500 liters per second is energetically used by a micro turbine. In the year 2014 a monitoring was realized to proof the function of the fish lock for upstream fish migration. Because of the water depth it was not possible to install fyke nets, thereby a simple, economical system with four waterproof video cameras, IR-spotlights and a computer equipped with an observation software was used. The cameras were installed at upper and lower entrance of the lock. Over a period of 127 controlling days about 1400 fish of 12 species were sighted while leaving the upper entrance. Unfortunately the observation of the lower entrance showed a significant lack of entering the lock. Many fishes hesitated to enter the lock chamber or leave it again. Because of this, different parameters of the lock were changed: duration of the lock cycle (especially the duration of entering period), reduction of flow velocity in the lock chamber and installing a daylight spotlight within the chamber. Especially the illumination tends to result in higher passage rates. Also shorter entering periods of maximum 20 minutes show slight effects. The period to exit the chamber should take about 30 minutes, but most of the individuals leave the chamber within the first 3 minutes after opening the door. There is no evidence that the fish lock is used by a significant amount of downstream migrating fish. In spring 2015 the investigations will be continued to show more clearly the efficiency of the illumination and the duration of entrance period.

https://scholarworks.umass.edu/fishpassage_conference/2015/June23/83