Search results | Digital Commons of Moss Landing Marine Laboratories

Title: Deepwater habitat and fish resources associated with the Big Creek Marine Ecological Reserve,
Description: Big Creek Marine Ecological Reserve (BCER), located off the central California coast, has been closed to fishing since January 1994. We used side scan sonar and an occupied submersible to collect baseline information on species-habitat relationships, density, and species and size composition of fish inside and outside BCER. Forty-three dives were made in the fall of 1997 and 1998, at depths of 20-250 m. From 142 video transects, we identified over 70,000 fish from 82 taxa, including 36 species of rockfish. About 93% of the 25,159 fish inside BCER were rockfishes representing at least 20 species. Young-of-the-year rockfishes dominated rock outcrops in 20-90 m depth inside and outside BCER. Four distinct fish assemblages were associated with (1) fine, smooth sediment in deep water; (2) bedrock with uneven surface in deep water; (3) sand waves and shell hash in shallow water; and (4) boulders and organic habitats on rock in shallow water. There were no significant differences in fish density among locations (inside and outside BCER) and depths or between years. Density was significantly higher in high-relief rock habitat than in low-relief soft and mixed sediments, regardless of location. There were no consistent patterns of larger fish inside compared to outside the protected area. We recommend development of a monitoring program to continue these surveys after increased time of protection and with increased assessment effort in the appropriate habitats of economically valuable species. In addition, extending the boundaries of BCER seaward would protect habitats and fish in water depths greater than 100 m., Cited By (since 1996):18, , , Downloaded from: http://calcofi.org/publications/ccreports.html (05 June 14).
Author: Yoklavich, Cailliet, Starr, Lea, De Marignac, Greene, Field
Date: 2002-01-01T00:00:00Z

Title: Rocks and fishes: submersible observations in a submarine canyon
Author: Yoklavich, Cailliet, Moreno
Date: 1993-01-01T00:00:00Z

Title: Seasonal and spatial patterns of ichthyoplankton abundance in Elkhorn Slough, California,
Description: Seasonal and spatial patterns in abundance of fish eggs and larvae are described from 323 samples collected from September 1974-September 1976 in Elkhorn Slough, a shallow, tidal embayment in Monterey Bay, California. These included 3645 larvae of 29 taxa that were numerically co-dominated by gobiid and clupeoid larvae. Ninety-four percent of the total catch comprised seven species, and included, in rank order abundance, Gillichthys mirabilis, Engraulis mordax, Clevelandia ios, Hypomesus pretiosus-osmerid, Leptocottus armatus, Genyonemus lineatus, and Clupea pallasii. Eggs of E. mordax, Citharichthys spp., and G. lineatus accounted for 73% of the catch. Two seasonal groups of larvae were evident. E. mordax and the gobiids (G. mirabilis and C. ios) formed a summer-fall group. While more speciose, a winter and early-spring group comprised of larval L. armatus, H. pretiosus-osmerid, Atherinidae and Ammodytes hexapterus was not as abundant as the summer-fall assemblage. Egg densities were overwhelmingly high in summer, due almost entirely to E. mordax. Similarity in species composition was greatest between collections from the most inland stations; larval assemblages from near-ocean stations were least similar to the inland slough assemblages. These distributions are attributed to reproductive specializations (egg type and spawning origin of adults) and hydrographic conditions. © 1992 Academic Press Limited., Cited By (since 1996):15, CODEN: ECSSD, ,
Author: Yoklavich, Stevenson, Cailliet
Date: 1992-01-01T00:00:00Z

Title: Interpretation of side-scan sonar records for rockfish habitat analysis: Examples from Monterey Bay
Author: Yoklavich, Cailliet, Greene, Sullivan
Date: 1995-01-01T00:00:00Z

Title: A geophysical approach to classifying marine benthic habitats: Monterey Bay as a model
Author: Greene, Yoklavich, Sullivan, Cailliet
Date: 1995-01-01T00:00:00Z

Title: A classification scheme for deep seafloor habitats,
Description: Cited By (since 1996):139, , , ,
Author: Greene, Yoklavich, Starr, O'Connell, Wakefield, Sullivan, McRea Jr., Cailliet
Date: 1999-01-01T00:00:00Z

Title: A classification scheme for deep seafloor habitats,
Description: A standard, universally useful classification scheme for deepwater habitats needs to be established so that descriptions of these habitats can be accurately and efficiently applied among scientific disciplines In recent years many marine benthic habitats in deep water have been described using geophysical and biological data. These descriptions can vary from one investigator to another, which makes it difficult to compare habitats and associated biological assemblages among geographic regions. Using geophysical data collected with a variety of remote sensor systems and in situ biological and geologic observations, we have constructed a classification scheme that can be used in describing marine benthic habitats in deep water., Cited By (since 1996):117, Rocks and Cores, CODEN: OCACD, ,
Author: Greene, Yoklavich, Starr, O'Connell, Wakefield, Sullivan, McRea Jr., Cailliet
Date: 1999-01-01T00:00:00Z

Title: Habitat associations of deep-water rockfishes in a submarine canyon: An example of a natural refuge,
Description: A multidisciplinary assessment of benthic rockfishes (genus Sebastes) and associated habitats in deep water was conducted in Soquel Submarine Canyon, Monterey Bay, California. Rock habitats at depths to 300 m were identified by using bathymetric and side-scan sonar imaging, verified by visual observations from a manned submersible, mapped and quantified. Species composition, abundance, size, and habitat specificity of fishes were determined by using a video camera and parallel laser system along transects made by a submersible. We counted 6208 nonschooling fishes representing at least 52 species from 83 10-min strip transects that covered an estimated 33,754 m 2. Rockfishes represented 77% of the total number of individuals, and included a minimum of 24 species. Six distinct habitat guilds of fishes were manifest from habitat-based clustering analysis: small species were associated with mud and cobble substrata of low relief, and larger species of rockfishes were associated with high-relief structures such as vertical rock walls, ridges, and boulder fields. There was remarkable concordance between some of the guilds identified in Soquel Canyon and the results of other habitat-specific assessments of fishes along the west coast of the United States from central California to Alaska. These generalities are valuable in predicting community structure and evaluating changes to that structure, as well as in applying small-scale species-habitat relationships to broader-scale fishery resource surveys. Additionally, establishment of these groups is critical when incorporating the concept of essential fish habitat (EFH), and negative impacts to it, into the management of fisheries in relatively deep water, as required by the Sustainable Fisheries Act of 1996. High numbers of large rockfishes (e.g. Sebastes chlorostictus, S. levis, S. rosenbblatti, and S. ruberrimus) were locally associated with rock ledges, caves, and overhangs at sites having little or no evidence of fishing activity. Abundance and size of several species were lower at fished than at unfished sites. We suggest that rock outcrops of high relief interspersed with mud in deep water of narrow submarine canyons are less accessible to fishing activities and thereby can provide natural refuge for economically important fishes, as exemplified in Soquel Canyon., Cited By (since 1996):106, CODEN: FSYBA, ,
Author: Yoklavich, Greene, Cailliet, Sullivan, Lea, Love
Date: 2000-01-01T00:00:00Z

Title: Recruitment of three species of juvenile rockfish (Sebastes spp.) on soft benthic habitat in Monterey Bay, California,
Description: A number of ecologically and economically important species of rockfishes recruited to soft benthic habitats in Monterey Bay, California, during 1995-96. Sebastes elongatus, S. saxicola, and S. levis were the most abundant and, although caught throughout the depth range (40-100 m) of our survey, had highest densities from 60 to 100 m. Densities of S. elongatus and S. saxicola were greater than that of S. levis. Peak settlement followed ocean upwelling. Size-frequency analysis indicated that, once settled, juvenile rockfish ontogenetically moved toward adult depths. Growth rates ranged from 0.17 to 0.32 mm/d, with growth declining during months of highest sea-surface temperature. Peaks in distribution of back-calculated birthdates corresponded with periods of increased upwelling. Significant emigration from the sampling area occurred during the onset of winter storms., Cited By (since 1996):13, , , Downloaded from: calcofi.org/publications/calcofireports/v42/Vol_42_Johnson_etal.pdf (8 June 2014).,
Author: Johnson, Yoklavich, Cailliet
Date: 2001-01-01T00:00:00Z

Title: Trophic ecology of the dominant fishes in Elkhorn Slough, California, 1974-1980,
Description: Cited By (since 1996):60, , , ,
Author: Barry, Yoklavich, Cailliet, Ambrose, Antrim
Date: 1996-01-01T00:00:00Z

Title: Temporal and spatial patterns in abundance and diversity of fish assemblages in Elkhorn Slough, California,
Description: Assemblages of ichthyofauna of shallow inshore habitats along Californía's central coast are described in terms of species composition, abundance, and life-style categories. A total of 22,334 fishes from 65 species and 27 families was collected with otter trawls at six sites in the main channel and tidal creeks of Elkhorn Slough, a tidal embayment and seasonal estuary, and two nearshore ocean stations in Monterey Bay during 44 months between August 1974 and June 1980. Greater than 90% of the catch comprised 10 species. The four dominant species, Cymatogaster aggregata, Leptocottus armatus, Phanerodon furcatus, and Embiotoca jacksoni, occurred during most or all seasons and were classified as residents or partial residents. Several abundant species were marine immigrants that seasonally use the slough as spawning and nursery grounds; this resulted in higher abundance and species richness during summer. Species collected during winter largely were slough residents. Species compsosition and richness varied with distance from the slough entrance. The ocean assemblage was most different, and its similarity to other stations decreased progressively with distance inland and into the tidal creeks. During our study, 5,074 fishes were collected by beach seine in Bennett Slough, a remote shallow marsh basin adjacent to the entrance of Elkhorn Slough. Species richness was relatively low and three euryhaline species accounted for >80% of the total catch. The species assemblage was most similar to those at the tidal creek and most shallow stations of Elkhorn Slough. Resident species numerically dominated assemblages in Bennett Slough and the most inland areas of Elkhorn Slough. The high relative abundance of marine-related fishes (classified as marine, marine immigrant, and partial resident), entering Elkhorn Slough early in life or as spawning adults indicates the importance of this habitat to nearshore fish assemblages. © 1991 Estuarine Research Federation., Cited By (since 1996):32, Fish and Fisheries, CODEN: ESTUD, ,
Author: Yoklavich, Cailliet, Barry, Ambrose, Antrim
Date: 1991-01-01T00:00:00Z