Journal
KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS
Volume -, Issue 401, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/kmae/2011015
Keywords
catch-per-unit effort; length-frequency distribution; Procambarus clarkii; sampling method; trapping
Categories
Funding
- ONEMA (Office Nationale de l'Eau et des Milieux Aquatiques)
- Region Pays de la Loire
Ask authors/readers for more resources
The ecological importance of the red-swamp crayfish (Procambarus clarkii) in the functioning of freshwater aquatic ecosystems is becoming more evident. It is important to know the limitations of sampling methods targeting this species, because accurate determination of population characteristics is required for predicting the ecological success of P. clarkii and its potential impacts on invaded ecosystems. In the current study, we addressed the question of trap efficiency by comparing population structure provided by eight trap devices (varying in number and position of entrances, mesh size, trap size and construction materials) in three habitats (a pond, a reed bed and a grassland) in a French marsh in spring 2010. Based on a large collection of P. clarkii (n = 2091, 272 and 213 respectively in the pond, reed bed and grassland habitats), we found that semi-cylindrical traps made from 5.5 mm mesh galvanized steel wire (SCG) were the most efficient in terms of catch probability (96.7-100% compared to 15.7-82.8% depending on trap types and habitats) and catch-per-unit effort (CPUE: 15.3, 6.0 and 5.1 crayfish.trap(-1).24 h(-1) compared to 0.2-4.4, 2.9 and 1.7 crayfish.trap(-1).24 h(-1) by the other types of fishing gear in the pond, reed bed and grassland respectively). The SCG trap was also the most effective for sampling all size classes, especially small individuals (carapace length <= 30 mm). Sex ratio was balanced in all cases. SCG could be considered as appropriate trapping gear to likely give more realistic information about P. clarkii population characteristics than many other trap types. Further investigation is needed to assess the catching effort required for ultimately proposing a standardised sampling method in a large range of habitats.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available