Mid-trophic species are the primary prey of many marine mammal species. We use data on the abundance and distribution of mid-trophic species to understand trends in mammal abundance and to predict marine mammal distributions. We have collected data on the abundance and distribution of mid-trophic species in the eastern Pacific Ocean using active acoustics and net tows. In the eastern tropical Pacific, we have extensively studied the distribution and abundance of flyingfish
Fiedler, P. C. , J. Barlow and T. Gerrodette. 1998. Dolphin prey abundance determined from acoustic backscatter data in eastern Pacific surveys. Fishery Bulletin, U. S., 96, 237-247.
Fiedler, P. C., S. B. Reilly, R. P. Hewitt, D. Demer, V. A. Philbrick, S. Smith, W. Armstrong, D. A. Croll, B. R. Tershy, and B. R. Mate. 1998. Blue whale habitat and prey in the California Channel Islands. Deep Sea Research Part II: Topical Studies in Oceanography 45:1781-1801.