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DRAFT 10 Colorado squawfish catch and relationship to flow acrd habitat Colorado squawfish catch, in numbers and in catch-per-effort was not closely correlated with flows or habitat availability. A number of potential relationships were examined, none were significant. The more important relationships were judged to be between squawfish, habitat, and flows, in the fall. The relationships between numbers and CPE of squawfish, and habitat availability and sampling flows were negative, although slightly positive for peak flow (Figure 3). However, there were some significant relationships between NNC and habitat availability and flow. The number of NNC in the fall was positively_correlated with total volume (p = .0003), and area (p = .OS). Catch-per-effort of NNC in the fa a~ alcn significantly correlated with habitat volume (p = .OS). Other non-significant positive relationships occurred with habitat area, 1 sampling flows and CPE. Peak flow was negatively correlated with fall CPE and number of NNC (p=. 1). Peak flow was not ngly correlated with umbers or CPE of NNC in the summer, ~/~ ~Z ar' although the relationship was.-negative. Colorado squawfish catch rates and numbers were negatively correlated with catch rates and numbers of NNC in the summer and the fall, but none were significant (Figure 4 ti,~ ~ Habitat classification Habitats were classified into 6 types, as defined in the appendix. Nearly all the habitats encountered were backwaters, few were flowthroughs or isolated pools. For the purposes of this discussion, all habitats are hereafter referred to as backwaters. The most common habitat type was migratory sandwave (MS), followed by scour channel (SC). Other habitat types were rarely encountered (Table 4). Colorado squawfish were collected more frequently in SC habitats than in -10-