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Eidborn, Anders, 2017. Fish sampling in lotic water : a study of the efficiency of the novel Nordic multi-mesh Stream Survey Net. Second cycle, A2E. Drottningholm: SLU, Department of Aqatic Resources

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Abstract

A free-flowing stream can offer several ecosystem services. Fish are one of these, and are an important
resource for society, both as a food source and as a biological indicator of the water quality,
which gives knowledge of the overall health of the stream. The lotic environment in fresh water
streams is an important habitat for many fish species.
The standard way to catch fish in lotic environments is electrofishing, which in most cases is performed
by two persons wading in shallow, hard-bottom parts of the stream with clear water. If the
water is deeper an electrofishing boat may be used, but it may be hard to find launching spots for the
rather big boat, making it impossible to reach some parts of the river.
The Nordic multi-mesh Stream Survey Net (NSSN) is a gill net that is designed to catch fish in lotic
environments. The net follows the same idea as Norden nets, with varying mesh size in 12 panels.
It works in streaming and still standing waters with a depth of 0.5 meters or more and is deployed on
the bottom, parallel with the stream.
This study tries to evaluate the efficiency of the NSSN. The survey was performed in
Hedströmmen in Sweden during three weeks in July 2015 and was conducted in five sites. The fish
community was sampled with the novel Nordic multi-mesh Stream Survey Net. In all, 2,702 fish
were caught from 12 different species. To determine the efficiency of the net the CVM-value was
calculated for species richness, proportion of individuals and biomass in each location. The data was
also compiled to species accumulation curves and compared to data from electrofishing conducted in
the same locations.
The result in this study shows that the NSSN works well and can be used as a supplementary sampling
method when surveying a lotic environment with electrofishing.

Main title:Fish sampling in lotic water
Subtitle:a study of the efficiency of the novel Nordic multi-mesh Stream Survey Net
Authors:Eidborn, Anders
Supervisor:Fjälling, Arne and Degerman, Erik
Examiner:Petersson, Erik
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2017
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:Other
Department:(NL, NJ) > Department of Aqatic Resources
Keywords:Fish sampling, NSSN, gill net, fish community
URN:NBN:urn:nbn:se:slu:epsilon-s-6255
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-6255
Subjects:Veterinary science and hygiene - General aspects
Language:English
Deposited On:22 Feb 2017 12:02
Metadata Last Modified:22 Feb 2017 12:02

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