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  • 1
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    Effects of kelp canopy removal on young-of-the-year rockfish abundance, using two census methods (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/377 | 8 | 2011-09-29 22:09:04 | 377 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: In 1976 an experimental research project was initiated to examine the possible effects of the removal of a giant kelp, Macrocystis pyrifera, canopy in a central California kelp bed on Young-of-the-Year (YOY) fish populations. A total of 7823 fishes was captured and marked using freeze branding. Pre-canopy removal population estimates were made using the Schnabel method and post-canopy removal population estimates were made using the Petersen method (Lincoln Index). A significant (p 〈 .0004) reduction of fish occurred immediately after the canopy was removed and the population remained at a reduced level for at least 60 days. This information warranted the creation of a second expanded project.In 1977 we established three study areas consisting of a kelp bed to be harvested (C), a kelp bed not to be harvested (NC) and a control kelp bed. We captured and marked over 82,000 YOY fish in Areas C and NC. Using the same statistical methods from the 1976 study, a significant reduction was found to occur in fish populations within harvested Area C and unharvested area NC: however, the reductions were not significantly different between the two areas. The large reduction in the fish population in theharvested area occurred when fish moved into the unharvestedarea. The large, unexpected reduction in fish numbers in theunharvested area (NC) occurred when larger predatory YOY bocaccio moved into the control area (X) as the experimental area (C) was being harvested. The bocaccio removed in excess of 20% of the biomass of YOY blue rockfish, which was composed of resident fish and recently migrated fish from the harvested kelp bed. Predation on YOY blue rockfish was also evident in the harvested area.Population estimates using visible fish transects by diverscorrelated well with population estimates from thecapture/recapture studies in 1976, but correlation was poorer the following year when many more fish were present. (32pp.)
    Keywords: Fisheries ; Biology ; giant kelp ; Macrocystis pyrifera ; bocaccio rockfish ; Sebastes paucispinis ; Blue rockfish ; Sebastes mystinus
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 2
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    Early life-history studies of nearshore rockfishes and lingcod off Central California, 1987-92 (2021)
    California Department of Fish and Game Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/385 | 8 | 2011-09-29 22:07:35 | 385 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: This study focused on the physical and biological processes that influence the distribution, abundance, growth, and survival of young-of-the-year (YOY) rockfishes and lingcod along the central California coast. The annual somatic and reproductive condition of adult female blue rockfish corresponded to annual upwelling. Resulting larval production may correspond to the reproductive potential of adults; however, ultimate recruitment success of YOY is also effected by oceanographic conditions during their planktonic stage. Within a year, each species of settled YOY was observed concurrently and in relatively similar abundances at all study dive sites along the central coast. Most species of YOY exhibited similar growth patterns amongstations and years. We found a high degree of interannual variability in the condition of adults and relativeabundances of YOY. We believe a large part of this variability is due to annual oceanographic conditions,specifically upwelling.Marine reserves, which would protect populations of reproductively mature rockfishes and lingcod and insure 1arval production, have been suggested as an alternative to present management strategies for these species. However, a crucial question is whether or not larvae from adult fish in reserves would significantly contribute to replenishing stocks in other areas. This study was undertaken to assist in determining the feasibility of reserves to enhance nearshore rockfish and lingcod populations. (78pp.)
    Keywords: Management ; Fisheries ; Biology ; Lingcod ; Ophiodon elongatus ; Olive Rockfish ; Sebastes serranoides ; vermilion rockfish ; Sebastes miniatus ; Kelp rockfish ; Sebastes atrovirens ; yellowtail rockfish ; Sebastes flavidus ; black rockfish ; Sebastes melanops ; blue rockfish ; Sebastes mystinus ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    The use of the anesthetic metomidate hydrochloride as an aid in open water capture of young-of-the-year rockfish (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/364 | 8 | 2011-09-29 22:10:54 | 364 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-28
    Description: Many species of young-of-the-year (YOY) rockfish, Sebastessp. move inshore into shallow reef areas in central California each year. We monitored the dates of arrival, relative abundance, species composition, lengths, and growth rates of these arrivals to help assess recruitment variability and stock success.We tested the usefulness of the anesthetic metomidatehydrochloride as a non-lethal method to collect YOY rockfish to assess growth, abundance, and species composition. Earlier experiments by other researchers illustrated the usefulness of metomidate to collect benthic-oriented adult rockfish. Our research tested the possibility of using metomidate hydrochloride to collect open-water and benthic-oriented YOY rockfish. The anesthetic was applied and the fish captured by divers. Several concentrations of metomidate were tested, premixed both in fresh and salt water.The anesthetic was not very useful in collecting open waterYOY rockfish as the fish rapidly left the area of application and avoided being anesthetized. Increasing the concentration of metomidate did not increase success of capture of open-water YOY rockfish. However, the anesthetic metomidate worked very well in capturing benthic-oriented YOY rockfishes. (22pp.)
    Keywords: Health ; Fisheries ; Biology ; Rockfish ; Sebastes
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    Results of the 1972 skindiving assessment survey, Pismo Beach to Oregon (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/773 | 8 | 2011-09-29 21:37:11 | 773 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: A skindiving survey was conducted from January throughDecember 1972 to estimate number of divers, diving days,hourly effort and animals taken from Pismo Beach to Oregon.Comparisons were made with estimates of the 1960 skindivingsurvey. A total of 15,030 divers were interviewed at 33locations from Pismo Beach, San Luis Obispo County, to theOregon border. The number of indiv1dual divers increasedfrom 2,200 in 1960 to 11,800 in 1972. Diving days increasedfrom 37,782 to 95,194. Over 50% of all diving was in theMonterey - Carmel area. Most diving hours were spent intraining, followed by abalone diving, observing, spearfishing, and photography. Totals of 82,174 abalones and 24,089 fishes were taken. Lingcod were the most abundant fish speared followed by blue rockfish and cabezon. Spearfishing dropped significantly in effort since 1960 and training and observing greatly increased. The take of abalones, urchins, crabs, and clams virtually disappeared from Point Estero to Seaside, the foraging range of the sea otter. The number of abalones taken increased outside the sea otter's range. (Document has 63 pages)
    Keywords: Fisheries ; Biology ; Pismo Beach ; California ; Oregon ; skindiving ; abalone ; spearfishing ; Lingcod
    Repository Name: AquaDocs
    Type: monograph
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