environment fig1 shows the present invention generally indicated by arrow 1 the sampling net 2 is provided with a mouth 3 of approximately 160 mm outside diameter and 150 mm inside diameter for sake of clarity the mesh of the sampling net is not shown in use the mouth faces upstream and samples carried by the water flow will enter the sampling net to be trapped at the collector 4 at the tail 5 of the net about the mouth 3 of the sampling net 2 is a collar 6 the collar is constructed from pvc of 170 mm outside diameter and 160 mm inside diameter the collar is provided with an abutment 7 on its inside face the coarse filter 8 a mesh of 250 microns is fitted to the collar the perimeter 9 of the coarse filter being friction fitted to the abutment the coarse filter has a diameter of 160 mm it should be noted that the mesh of the coarse filter is shown larger than actual size the collar secures the sampling net to a section of the handle 10 via bolts 11 12 and wing nuts not shown through a bracket not shown wing nuts are used to speed assembly and disassembly of the sampling device the handle is provided with screw joints 13 14 allowing the handle sections 10 15 to allow extra handle sections to be added as required or to allow the sampling device 1 to be easily broken down for shipping and transportation each handle section is constructed from.