It’s a Trap! An evaluation of different passive trap types to effectively catch and control the invasive red swamp crayfish (Procambarus clarkii) in streams of the Santa Monica Mountains Author De Palma-Dow, Angela A. * & Mountains Restoration Trust, 3815 Old Topanga Canyon Rd., Calabasas, CA 91302, USA & * & Lake County Water Resources Department, 255 N. Forbes St., Lakeport, CA 95453, USA Author Curti, Joseph N. * & Mountains Restoration Trust, 3815 Old Topanga Canyon Rd., Calabasas, CA 91302, USA Author Fergus, C. Emi National Research Council, C / o USEPA Western Ecology Division, 200 SW 35 St, Corvallis, OR 97333, USA text Management of Biological Invasions 2020 2019-12-04 11 1 44 62 http://dx.doi.org/10.3391/mbi.2020.11.1.04 journal article 10.3391/mbi.2020.11.1.04 1989-8649 11974441

Table 1. Trap specifications describing the standard base trap models and modified traps used in this study. All traps were given a soak time of 24 hours. * indicates if trap attribute was modified to fit testing parameters.

Trap ID Code	Base Model Brand and Description	Material	Requirements	Color	Opening size	# Traps Per Section	Total # Traps In Study
PROMAR (BLACK 2.5 cm) PROMAR (SILVER 2.5 cm) PROMAR (BLACK 10.2 cm)	Promar TR-601 Minnow / Funnel Trap, 22.2 × 45.7 cm	Vinyl coated wire mesh	> 25.4 cm water depth	Black Silver* Black	2.5 cm 2.5 cm 10.2 cm*	3 3 3	9 9 9
GEE MINNOW (SILVER 2.5 cm) GEE MINNOW (SILVER 10.2 cm) GEE MINNOW (BLACK 2.5 cm)	Gee Minnow / funnel Trap, 22.9 × 44.5 cm	.64 cm Galvanized steel wire	> 25.4 cm water depth	Silver Silver Black*	2.5 cm 10.2 cm* 2.5 cm	3 3 3	9 9 9
CUSTOM PYRAMID (5.1 cm) CUSTOM PYRAMID (10.2 cm)	Custom Pyramid trap with three openings at bottom corners, PVC opening at top for fish to escape	.64 cm square metal mesh	> 61 cm depth, shoreline anchor nearby (i.e. branch or root)	Grey Grey	5.1 cm* 10.2 cm*	2 2	6 6
PROMAR MESH 501 (“ProMSH501”)	Promar TR-501, 45.7 × 25.4 cm	Red fabric mesh, metal end frames	> 128 cm depth, low flow	Red	6.4 cm	3	9
PROMAR MESH 503 (“ProMSH503”)	Promar # TR-503 61 × 30.5 cm	Black polyethylene netting	> 33 cm depth, low flow	Black	14 cm (slack)	3	9
Tube Trap (15.2 cm) Tube Trap (30.5 cm)	Custom refuge, “Tube” traps, 5.1 cm diameter	Black PVC pipes taped together in-line	> 7.6 cm depth, flat area in sediment with rock/ weight to keep trap submerged	Black Black	5.1 cm diameter / 15.2 cm long 5.1 cm diameter / 30.5 cm long	3 3	9 9
Total number of traps deployed							102