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A Trial of Natural Habitat Enclosure Traps as a Sampling Tool for Juvenile Crayfish

Fjälling, Arne and Engdahl, Fredrik and Edsman, Lennart and Bohman, Patrik and Sandström, Alfred (2013). A Trial of Natural Habitat Enclosure Traps as a Sampling Tool for Juvenile Crayfish. Freshwater Crayfish. 2:19, 137-144
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Abstract

Recruitment is a vital factor in the assessment, management and population dynamics of decapods. Since the juvenile stages of crayfish often prefer heterogeneous habitats, sampling with quantitative and reproducible methods have so far been challenging. We evaluate a new quantitative sampling method for juvenile crayfish; the enclosure trap. A field test was carried out during two consecutive years on a population of signal crayfish, Pacifastacus leniusculus, in littoral areas of Swedish Lake Erken. The densities of 0+ crayfish varied substantially with year, sampling date and substrate type. As expected, juvenile crayfish densities decreased over time in both study years, indicating a high mortality rate during their first year of life. Juveniles preferred gravel and stone over soft and sand substrates. Mean growth rate varied from 0.15 to 0.22 mm day-1. We evaluate this method and present recommendations for how to design and optimize field studies using enclosure traps. We conclude that enclosure traps can be used to collect valuable data on density, growth and habitat preference of juvenile crayfish, thus providing useful information for studies on population dynamics and increasing the understanding of crayfish recruitment processes.

Authors/Creators:Fjälling, Arne and Engdahl, Fredrik and Edsman, Lennart and Bohman, Patrik and Sandström, Alfred
Title:A Trial of Natural Habitat Enclosure Traps as a Sampling Tool for Juvenile Crayfish
Series/Journal:Freshwater Crayfish (2076-4332)
Year of publishing :2013
Volume:2
Number:19
Page range:137-144
Number of Pages:8
Publisher:International Association of Astacology
ISSN:2076-4332
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Keywords:enclosure traps, growth, juvenile signal crayfish, Pacifastacus leniusculus, population density, recruitment, sampling method
URN:NBN:urn:nbn:se:slu:epsilon-e-4267
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4267
ID Code:14336
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:19 Jul 2017 11:04
Metadata Last Modified:19 Jul 2017 11:04

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