TRPA Fish Biologists

TRPA Fish Biologists is a woman-owned fisheries consulting firm based in Arcata, California, serving clients across the Pacific Northwest, Rocky Mountain region, New England, the East Coast, Hawaii, Guam, and Newfoundland, with a focus on northern and central California. Its biologists bring more than 35 years of experience and have contributed to over 300 projects, ranging from small fish-rearing ponds to large resort developments and spanning streams, rivers, and coastal estuaries.

The firm provides fish monitoring, aquatic habitat evaluations and modeling, instream flow analysis, and assessment of water resource projects’ effects on fisheries. Its services also include environmental reviews, licensing support, mitigation planning, and fish salvage and relocation, including work involving federally and state-listed fish and amphibians. TRPA staff have experience developing habitat-use criteria, evaluating instream temperatures, and negotiating fishery protection measures. The firm also identifies special-species services among its capabilities. For clients interested in modeling tools, TRPA provides information about SEFA and RHABSIM 3.0, a legacy river hydraulics and aquatic habitat modeling program.