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~w~ The unit of effort was calculated using only the hours of darkness the traps were set. The following physical measurements were recorded when setting and retrieving light traps: river mile, set and pickup time, set and pickup water temperature, the depth of water where the trap was set, whether or not the batteries were still illuminating the light in the morning, whether or not any fish were preserved and number of bags, numbers offish released, and comments on set location. The majority of light trap sampling was concentrated near the confluence of the San Rafael River at the following specific sties: San Rafael River (RM 97.0), White Wash (RM 95.5), Red Wash (RM 95), and an unnamed wash (RM 94.5) just downstream of Red Wash. Habitats between RM 97 and Mineral bottom (RM 52.1) were sampled once in June , 199~,t;~nd another trip was made from Millazd Canyon/ Anderson Bottom (RM 33.4/ 31.2) downstream to river mile 25.3 in June , 1995. Most of the sampling was conducted in flooded mouths of tributaries. On the trip from the San Rafael to Mineral Bottom the.lit ~ were placed in backwater habitats. During the trip from Millazd Canyon downstream'the mol~ths of Millard Can on 33.4 and of an ~ _ Y (~ ) S ~ unnamed wash at Anderson Bottom (RM 31.2), as well as some backwaters downstream of 6v ~~ Anderson Bottom wer~~is~lrl~.~ ~~ Two sizes of seine were used: a one person larval seine (lm2 ; .8mm mesh) and a two person beach seine (4m x 1.Sm; 1.25mm mesh). Seining usually occurred in late afternoon or early evening, in association with setting the light traps. Unit of effort for seine hauls was calculated by azea sampled. Physical measurements of the habitat and seine hauls were recorded similar to those collected during ISMP YOY sampling. These measurements included river and river mile, primary habitat, backwater_and main channel temperature, start time, sample area (m), maximum depth and substrate, depth 1 and substrate, depth 2 and substrate, mud depth, whether or not the seine haul was across or parallel to the shore, whether or not the deepest section of the backwater was seined, whether or not fish were preserved, and if so, the number of bags, and numbers offish released. Many of the lazger fish were identified, counted and released in the field. All larval fish collected were preserved in 100% ethanol and placed into small plastic vials. All larval samples were sent to the Larval Fish Lab in Fort Collins, Colorado for processing. Processing included identifying to species, counting by species, and measuring each fish to the nearest mm. DRAFT 7