Diablo Canyon power plant site ecological study Quarterly Report no. 20: April 1 - June 30, 1978

Gotshall, Daniel W. and Laurent, Laurence L. and Grant, John J. (1979) Diablo Canyon power plant site ecological study Quarterly Report no. 20: April 1 - June 30, 1978. Avila Beach, CA, California Department of Fish and Game, Marine Resources Region, (Marine Resources Administrative Report, 79-4)

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Abstract

Although we continue to monitor permanent stations on a regular basis, we have suspended our 30-m2 random subtidal and 1/4-m2 random intertidal studies during this interim year. The 1/4-m2 random subtidal study is being continued and we have added a new subtidal method of determining fish abundance. Giant red sea urchin, Strongylocentrotus franciscanus, numbers continue to decline at their last "stronghold" in our subtidal study area, permanent station 15. The recruitment of juvenile blue rockfish, Sebastes mystinus, appears to be either late or low this year in our study areas. The most abundant fish, so far, from the new method of assessment, are adult blue rockfish, kelp greenling, Hexagrammos decagrammus, and gopher rockfish, Sebastes carnatus. Various trends of abalone abundance at the permanent intertidal stations, increasing at some, decreasing at others, were observed during this quarter. Sea otters, Enhydra lutris, seem to have reached their annual springtime peak in abundance during April and May. Several otters were seen rafting and foraging around and near the intake cove breakwaters, apparently becoming emboldened to human presence. (18pp.)

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