Monitoring Rusty Crayfish in Southern Ontario Streams and Rivers

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MethodsField sampling• removal sampling within closed units• 20m length for hand-picking and backpacke-fishing samples• 10m length for bag seine• 15 replicates per gear typeData analysis• population size & capture probability (P)were estimated using a generalizedremoval model (software: MICROFISH)3-5 passesFlowblock-nets
Results – Species Detection• six species collected from study streams• rusty crayfish was dominant species:– 65% of sampling units– 90% of total number of individuals captured– only species in four of eleven streams– generally collected during first pass• electrofishing most effective– all six species detected• seining least effective– only three species captured– often required multiple hauls for speciesdetection
Page 8 and 9: Population Size & Catchability70.86
Page 10 and 11: Recommendations for Monitoring• c
Page 13 and 14: Sampling Method10m1m- study reach l
Page 15 and 16: Variation in River Crayfish Fauna2C
Page 17 and 18: Implications for Queensnake?• pre

Monitoring Rusty Crayfish in Southern Ontario Streams and Rivers

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