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  • 1
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    Sea otter, Enhydra lutris, containment management: field studies and feasibility assessment (2021)
    California Department of Fish and Game Marine Resources Division | Morro Bay, CA
    In:  http://aquaticcommons.org/id/eprint/388 | 8 | 2011-09-29 22:07:52 | 388 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: Limiting sea otter geographic distribution in California (containment management) has long been recognized as being necessary to preserve human recreational and commercialuses of shellfish resources. However, passage of federal legislation that focused preferentially on marine mammal protection and the 1977 listing of the California sea otter population as "threatened" effectively precluded any range-limiting management program.Research, however, that evaluated various non-lethal means of influencing sea otter movements and distribution was encouraged. Our research suggests that herding and acoustical devices may not have any real potential use in this context. Based on research-related capture success rates, capture and relocation techniques may be useful in influencing sea otter geographical distribution.The translocation of sea otters to San Nicolas Island provided the first opportunity to test the technical feasibility of maintaining a large area free of sea otters. Capture success rates were appreciably poorer than those achieved during research-related efforts. We identifyseveral logistical and behavioral influences that contributed to the relatively poor success rate. Based on this evaluation, we discuss the factors likely to limit application of these techniques in the future.We feel that capture techniques can be useful in a long-term management program, if used in conjunction with efforts to limit the sea otter population growth rate. Consequently, wefeel future research should focus on assessing individual health effects from using chemical contraceptives and assessing the feasibility of their use to safely control population growth. (12pp.)
    Keywords: Management ; Fisheries ; Biology ; Sea otter ; Enhydra lutris ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    Diablo Canyon Power Plant site ecological study, Quarterly Report no. 9, July 1 - September 30, 1975 (2021)
    California Department of Fish and Game, Marine Resources Region | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/405 | 8 | 2011-09-29 22:06:05 | 405 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: During the Quarter we surveyed seven permanent and 48 random subtidal stations. In addition a new study was undertaken with the surveying of one random subtidal station in Diablo Cove where counts were made of small invertebrates within four 1/4-m quadrats. Red abalone, Haliotis rufescens, numbers continued to decrease at random as well as permanent stations in Diablo Cove. Bull kelp, Nereocystis lustkeana, more than doubled in density in Diablo Cove. Permanent stations showed a decline in giant red sea urchin, Strongylocentrotus franciscanus, numbers while random stations indicated an increase in abundance. (14pp.)The commercial sea urchin fishery was inactive. Commercial abalone fishermen were observed infrequently in the Pecho Rock area.
    Keywords: Ecology ; Fisheries ; Biology ; Red abalone ; Haliotis rufescens ; Bull Kelp ; Nereocystis luetkeana ; giant red sea urchin ; Strongylocentrotus franciscanus
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    Diablo Canyon power plant site ecological study Quarterly Report no. 6; October 1 - December 31, 1974 (2021)
    California Department of Fish and Game, Marine Resources Region | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/60 | 8 | 2011-09-29 13:04:45 | 60 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-25
    Description: During the period October 1 - December 31, 1974, a total ofsix permanent subtidal stations and ten random intertidal stations were surveyed.Red tides and rough seas limited both the commerical abalone and sea urchin fishery activities. Most activity was concentrated between Diablo Cove and Pecho Rock. Divers, however, did work urchin beds as far north as Lion Rock.Sea otter counts have remained relatively stable with almost all individuals being observed north of Lion Rock.Fourteen random fishing stations were completed. Low catch rates reflected fishing success in areas with a heavy brown algae surface canopy. (12pp.)
    Keywords: Ecology ; Biology ; Diablo Canyon Power Plant ; California ; environmental impact
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    Type: monograph
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  • 4
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    Diablo Canyon power plant site ecological study Quarterly Report no. 7; January 1 - March 31, 1975 (2021)
    California Department of Fish and Game, Marine Resources Region | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/65 | 8 | 2011-09-29 13:04:30 | 65 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-25
    Description: During the period January 1 - March 31, 1975 we relocatedand remarked five permanent subtidal stations and surveyed 28 random and two permanent intertidal stations. We failed to find a single giant red sea urchin, Strongylocentrotus franciscanus, around station 16 during a dive in March. Abalone, Haliotis spp., numbers decreased at random intertidal stations in North Diablo Cove and the North Control Area.The commerical sea urchin fishery was inactive, while the commerical red abalone, H. rufescens, fishery continued to operate around Pecho Rock.Counts of sea otters south of Point Buchon increased significantly, 20 to 30 otters are now feeding just north of Pecho Rock.Eight random fishery stations in Diablo Cove, Lion Rock Cove and the North Control Area yielded a substantial increase in catch-per-unit-of-effort. (15pp.)
    Keywords: Ecology ; Biology ; Diablo Canyon Power Plant ; California ; environmental impact
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    Type: monograph
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  • 5
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    Diablo Canyon power plant site ecological study Quarterly Report no. 15: January 1 - March 30, 1977 (2021)
    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/68 | 8 | 2011-09-29 13:04:11 | 68 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-25
    Description: Three permanent subtidal stations were surveyed. Little change in densities of quantified plants and animals was apparent at two of the stations. However, the density of giant red sea urchins, Strongylocentrotus franciscanus, declined 57 percent at station 15 in South Cove after foraging by about 20 sea otters, Enhydra lutris, occurred in February.Stormy seas hampered intertidal surveys. As a result, wewere unable to conduct surveys at our Diablo Point study area.Survey dives were made to assess impacts of the cooling water flow immediately in front of the outfall structure.Our foam observations in Diablo Cove were discontinued after PG&E installed an automatic camera system on their Met Tower. The camera takes a photo every 15 minutes during daylight hours.A small raft of sea otters has taken up residence in aMacrocystis bed in the cove north of Diablo Cove. These otters are foraging at least as far south as Diablo Cove. (21pp.)
    Keywords: Ecology ; Biology
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    Type: monograph
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  • 6
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    Diablo Canyon power plant site ecological study Quarterly Report no. 10; October - December 31, 1975 (2021)
    California Department of Fish and Game, Marine Resources Region | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/96 | 8 | 2011-09-29 22:36:03 | 96 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: Field work during the quarter included surveys of permanentand random subtidal and intertidal stations. At permanentsubtidal stations densities of the brown algae Laminaria and Nereocystis decreased as did densities of giant red sea urchins, Strongylocentrotus franciscanus.Counts of small invertebrates within one-quarter meter square (1/4-m2) quadrats at random subtidal stations were begun. A total of 32 quadrats was completed. Balanophyllia elegans was the most abundant and most common animal encountered. The annual surface count of bull kelp (Nereocystis) was not possible because of the increased density; instead we utilized subtidal counts toestimate the surface canopy. An estimate of 33,000 plants was made for this year's canopy; this compares with a count of 18,000 plants last year. Sampling of random intertidal stations for the Davidson period began; 15 stations were surveyed. In addition, permanent intertidal stations 1, 2 and 3 were surveyed for abalone densities.The sea otter, Enhydra lutris, herd continued to occupy the area around Point Buchon.In November daily observations were initiated on foam location and abundance in Diablo Cove. (13pp.)
    Description: Pacific Gas and Electric Company Cooperative Research Agreement 5-11-75
    Keywords: Ecology ; Fisheries ; Environment ; Diablo Canyon Power Plant ; California ; environmental impact
    Repository Name: AquaDocs
    Type: monograph
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  • 7
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    Diablo Canyon power plant site ecological study Quarterly Report No. 14 (2021)
    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/134 | 8 | 2011-09-29 22:31:37 | 134 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: We surveyed eight of the permanent subtidal stations, and spent considerable time replacing surface and subsurface buoys on these stations. Little change was evident in densities of quantified invertebrates. Densities of some of the brown algae continued to increase. Surveys of random 30-m2 subtidal stations in the North Control were completed.Davidson current oceanographic period intertidal surveys were begun. High seas prevented us from occupying stations on several days of excellent minus tides; however, 12 random and 4 permanent stations were surveyed. The annual census of bull kelp, Nereocystis luetkeana, yielded a count of 11,323 surface canopy plants, a decrease from last year's estimate. Foam observations were continued in Diablo Cove. (15pp.)
    Keywords: Ecology ; Fisheries ; Diablo Canyon Power Plant ; California ; environmental impact
    Repository Name: AquaDocs
    Type: monograph
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  • 8
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    Diablo Canyon power plant site ecological study annual report; July 1, 1973 - June 30, 1974 (2021)
    California Department of Fish and Game, Marine Resources Region | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/147 | 8 | 2011-09-29 22:31:06 | 147 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: We completed surveys of 11 permanent subtidal stations, 17 random subtidal stations, 4 permanent intertidal stations, and 29 random intertidal stations during the period. In addition, we conducted studies on the sea otter, Enhydra lutris, herd located between Diablo Cove and Point Buchon, continued the annual count of the mature bed of the bullkelp, Nereocystis luetkeana, within Diablo Cove, and interviewed commercial abalone and sea urchin divers for catch-per-unit-of-effort data. During the year, sea otters moved south into the cove east of Lion Rock and then into Diablo Cove. (107pp.)The commercial abalone fishery showed signs of decline, while the commercial sea urchin fishery continued to expand. Several diving surveys were conducted inside Intake Cove to check on dredging progress; the cove appears to have become a haven for juvenile rockfish (Sebastes). The red abalone temperature tolerance studies were completed at the Department's marine culture laboratory at Granite Canyon.
    Keywords: Ecology ; Fisheries ; Biology ; Diablo Canyon Power Plant ; California ; environmental impact
    Repository Name: AquaDocs
    Type: monograph
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  • 9
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    Diablo Canyon power plant site ecological study annual report; July 1, 1974 - June 30, 1975 and Quarterly Report no. 8 April 1, 1975 - June 30, 1975 (2021)
    California Department of Fish and Game, Marine Resources Region | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/152 | 8 | 2011-09-29 22:30:41 | 152 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: We continued surveys of permanent and random subtidal stations, completing surveys of 13 permanent stations and 28 random stations during the year. Red abalone numbers continued to decline in Diablo Cove and Control Areas. Giant red sea urchins declined at permanent stations. The bull kelp canopy increased noticeably in Diablo Cove.Most of our time was spent surveying intertidal stations andprocessing algae samples. Both red and black abalone showeda decrease in numbers in Diablo Cove as well as the ControlArea.Sea otters moved north of Diablo Cove to the Pt. Buchon areain the fall of 1974. In the spring of 1975 the rafts movedsouth again to the vicinity of Pecho Rock.The commercial sea urchin fishery was inactive during most of the year, while the commercial abalone fishery operated at a very low level.Several miscellaneous studies were continued or initiated during the period. 112pp.)
    Keywords: Ecology ; Fisheries ; Diablo Canyon Power Plant ; California ; environmental impact
    Repository Name: AquaDocs
    Type: monograph
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  • 10
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    Diablo Canyon power plant site ecological study Quarterly Report No. 13; July 1 - September 30, 1976 (2021)
    California Department of Fish and Game, Marine Resources Region | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/159 | 8 | 2011-09-29 22:29:52 | 159 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: Surveys of 39 random 30-m2 subtidal stations and 56 random1/4-m2 subtidal stations in Diablo Cove and the North Control were completed.The mean density of red abalones, Haliotis rufescens, inDiablo Cove was greater this year (0.02/m2) than last year(0.005/m2). This difference probably reflects sampling variation rather than density change.A total of 29 sportfish catch-per-unit-of-effort stations was sampled in Diablo Cove and 12 in the North Control.Foam observations in Diablo Cove were continued. The coolingwater pumps were not in operation. The amounts of foamappeared to be about the same during certain weather conditions as those when the pumps are in operation, although not as thick.The number of sea otters, Enhydra lutris, decreased substantially between Pt. Buchon and Pecho Rock. This was due to their annual migration (or "pulling back") into the more central parts of their range.Random surveys of the intertidal areas during the upwellingperiod were completed. (11pp.)
    Keywords: Ecology ; Fisheries ; Biology ; Diablo Canyon Power Plant ; California ; environmental impact
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    Type: monograph
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