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  • 1
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/682 | 8 | 2011-09-29 21:41:38 | 682 | California Department of Fish and Game
    Publication Date: 2021-07-02
    Description: Ovigerous Dungeness crabs were collected from the SanFrancisco and Eureka-Crescent City regions and maintained atthe Department's Marine Culture Laboratory near Monterey.Hatching success, expressed as viable larvae released, wasmeasured and compared by region. Larval counts were made from 15 Dungeness crabs, 5 from the San Francisco region, 7 from the Eureka-Crescent City area and 3 of unknown origin. Mean hatching success exceeded 80% in the San Francisco region, and averaged more than 90% in the Eureka-Crescent City area. However, a Student's t-Test showed this difference in hatching success was not significant. (16pp.)
    Keywords: Biology ; Dungeness crab ; Cancer magister ; California ; San Francisco
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/684 | 8 | 2011-09-29 21:41:45 | 684 | California Department of Fish and Game
    Publication Date: 2021-07-02
    Description: Sea otter foraging along Monterey Bay beaches and at Atascadero State Beach has precluded recreational Pismo clam fisheries at six major clamming beaches. Outside the sea otter's foraging range Pismo clam stocks are yielding good catches; apparently the stringent controls on the recreational fishery is adequate to maintain the State's Pismo clam stocks. Clammer interviews at Orange and Los Angeles County beaches and at beaches near Pismo Beach and Morro Bay and in Monterey Bay revealed the clam stocks to be on a healthy, sustainable yield basis. Exceptionallylarge numbers of small 1.5 to 3.5 inch Pismo clams were reported at all clam beaches surveyed north of Pt. Conception indicating good year class survival in recent years. Sea otters forage dense Pismo clam beds by moving along a "front", progressively foraging from one beach to the next, reducing the clams to low levels before moving on. Some sea otters continue to forage throughout the areas previously depleted by the larger aggregate moving northward, thus the large numbers of sublegal clamsin the 1.5 to 3.5 inch size group in these intertidal and shallow subtidal areas are not expected to reach legal size in numbers sufficient to develop a recreational fishery. In Monterey Bay about 60,000 Pismo clams were removed or killed by human activity in the April 1974 to March 1975 period. A rough estimate of the Pismo clams consumed by sea otters during this same period in Monterey Bay is over 500,000 clams. (51pp.)
    Keywords: Ecology ; Management ; Biology ; Pismo clam ; Tivela stultorum ; Sea otter ; Enhydra lutris L. ; Monterey Bay ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    California Department of Fish and Game | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/1778 | 8 | 2011-09-29 20:04:23 | 1778 | California Department of Fish and Game
    Publication Date: 2021-07-10
    Description: The Channel Islands—sometimes called the Galapagos of North America—are known for their great beauty, rich biodiversity, cultural heritage, and recreational opportunities. In 1980, in recognition of the islands’ importance, the United States Congress established a national park encompassing 5 of California’s Channel Islands (Santa Barbara, Anacapa, SantaCruz, Santa Rosa, and San Miguel Islands) and waters within1 nautical mile of the islands. In the same year, Congress declared a national marine sanctuary around each of these islands, including waters up to 6 nautical miles offshore. Approximately 60,000 people visit the Channel Islands each year for aquatic recreation such as fishing, sailing, kayaking, wildlife watching, surfing, and diving. Another 30,000 people visit the islands for hiking, camping, and sightseeing. Dozens of commercial fishing boats based in Santa Barbara, Ventura, Oxnard, and other ports go to theChannel Islands to catch squid, spiny lobster, sea urchin, rockfish, crab, sheephead, flatfish, and sea cucumber, among other species. In the past few decades, advances in fishing technology and the rising number of fishermen, in conjunction with changing ocean conditions and diseases, have contributed to declines in some marine fishes and invertebrates at the Channel Islands. In 1998, citizens from Santa Barbara and Ventura proposed establishment of no-take marine reserves at the Channel Islands, beginning a 4-year process of public meetings, discussions, and scientific analyses. In 2003, the California Fish and Game Commission designated a network of marine protected areas (MPAs) in state waters around the northern Channel Islands. In 2006 and 2007, the National Oceanic and Atmospheric Administration (NOAA) extended the MPAs into the national marine sanctuary’s deeper, federal waters.To determine if the MPAs are protecting marine species and habitats, scientists are monitoring ecological changes. They are studying changes in habitats; abundance and size of species of interest; the ocean food web and ecosystem; and movement of fish and invertebrates from MPAs to surrounding waters. Additionally, scientists are monitoring human activities such as commercial and recreational fisheries, and compliance with MPA regulations.This booklet describes some results from the first 5 years of monitoring the Channel Islands MPAs. Although 5 years is not long enough to determine if the MPAs will accomplish all of their goals, this booklet offers a glimpse of the changes that are beginning to take place and illustrates the types of information that will eventually be used to assess the MPAs’ effectiveness.(PDF contains 24 pages.)
    Keywords: Management ; Ecology ; Conservation ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    California Department of Fish and Game | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/2429 | 8 | 2011-09-29 19:06:53 | 2429 | California Department of Fish and Game
    Publication Date: 2021-07-13
    Description: (PDF contains 4 pages.)
    Keywords: Fisheries ; Biology ; central California ; northern California ; cruise report ; N. B. Scofield ; market crab ; Cancer magister
    Repository Name: AquaDocs
    Type: monograph
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  • 5
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    California Department of Fish and Game | Terminal Island, CA
    In:  http://aquaticcommons.org/id/eprint/2444 | 8 | 2011-09-29 19:03:34 | 2444 | California Department of Fish and Game
    Publication Date: 2021-07-13
    Description: (PDF contains 7 pages.)
    Keywords: Fisheries ; Biology ; northern California ; central California ; Fort Bragg ; San Francisco ; cruise report ; N. B. Scofield ; pink shrimp ; Pandalus jordani ; bathythermograph ; market crabs ; Cancer magister ; sex ratios ; size
    Repository Name: AquaDocs
    Type: monograph
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  • 6
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    California Department of Fish and Game | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/2904 | 8 | 2011-09-29 18:10:25 | 2904 | California Department of Fish and Game
    Publication Date: 2021-06-29
    Description: Four groups of fin clipped brown trout (Salmo trutta) fingerlings were planted in Hot Creek over a six year period. Survival and growth were estimated by fall and/or spring mark-and-recapture surveys. Yield to the angler for two of the tour groups stocked was estimated by stratified random creel surveys. Fingerling survival from the midsummer stocking period to fall averaged 51 %. Overwinter survival from young-of-the-year to yearling fish averaged 49%. Angler harvest of two groups of fingerlings stocked at densities of 16,082 fish/mile averaged 1,704 trout/mile (10.6%) and 194 lbs/acre. Abundant cover and microhabitat suitable tor young trout, ice-free winters, and rapid growth were factors viewed as contributing to high yields. Results do not suggest a change is needed in the general policy of not stocking brown trout fingerlings in California streams. Results do show that fingerlings stocked in Hot Creek, and presumably other productive streams with abundant cover, can effectively fill a void created by limited recruitment.(PDF contains 24 pages.)
    Keywords: Ecology ; Fisheries ; Aquaculture ; brown trout ; fingerling ; fish stocking ; mark-and-recapture ; creel ; California ; Hot Creek ; recruitment ; microhabitat
    Repository Name: AquaDocs
    Type: monograph
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  • 7
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/1421 | 8 | 2011-09-29 20:35:45 | 1421 | California Department of Fish and Game
    Publication Date: 2021-07-08
    Description: (Document pdf contains 64 pages)
    Description: Southern California Edison Company
    Description: Nearshore Sport Fish Habitat Enhancement Program
    Keywords: Ecology ; Management ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 8
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    California Department of Fish and Game | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/2845 | 8 | 2011-09-29 18:14:52 | 2845 | California Department of Fish and Game
    Publication Date: 2021-06-29
    Description: Sediment sampling was used to evaluate chinook salmon(Oncorhynchus tshawytscha) and steelhead (O. mykiss) spawning habitat quality in the South Fork Trinity River (SFTR) basin. Sediment samples were collected using a McNeil-type sampler and wet sieved through a series of Tyler screens (25.00 mm, 12.50 mm, 6.30 mm, 3.35 mm, 1.00 mm, and 0.85 mm). Fines (particles 〈 0.85 mm) were determined after a l0-minute settling period in Imhoff cones. Thirteen stations were sampled in the SFTR basin: five stations were located in mainstem SFTR between rk 2.1 and 118.5, 2 stations each were located in EF of the SFTR, Grouse Creek, and Madden Creek, and one station each was located in Eltapom and Hayfork Creeks. Sample means for fines(particles 〈 0.85 mm) fer SFTR stations ranged between14.4 and 19.4%; tributary station sample mean fines ranged between 3.4 and 19.4%. Decreased egg survival would be expected at 4 of 5 mainstem SFTR stations and at one station in EF of SFTR and Grouse Creek where fines content exceed 15%. Small gravel/sand content measured at all stations were high, and exceed levels associated with reduced sac fry emergence rates. Reduction of egg survival or sac fry emergence due to sedimentation in spawning gravels could lead to reduced juvenile production from the South Fork Trinity River.(PDF contains 18 pages.)
    Keywords: Ecology ; Fisheries ; Earth Sciences ; sediment ; habitat ; chinook salmon ; Oncorhynchus tshawytscha ; steelhead ; Oncorhynchus mykiss ; South Fork Trinity River Basin ; Grouse Creek ; Madden Creek ; Eltapom Creek ; Hayfork Creek
    Repository Name: AquaDocs
    Type: monograph
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  • 9
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/664 | 8 | 2011-09-29 21:43:00 | 664 | California Department of Fish and Game
    Publication Date: 2021-07-01
    Description: The market crab (Canaer magister) resource offCalifornia is undergoing heavy pressure and appears tobe near full exportation. The fisheries in the SanFrancisco and Central California areas are at low levelsof abundance but the population off Eureka and CrescentCity appears relatively healthy. (18pp.)
    Keywords: Management ; Fisheries ; Biology ; Market crab ; Cancer magister ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 10
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/714 | 8 | 2011-09-29 21:40:54 | 714 | California Department of Fish and Game
    Publication Date: 2021-07-02
    Description: A total of 366 bimonthly (January 1978-January 1979) samples taken with six types of gear (otter trawl, gill net, bag seine, small seine, drop net, square enclosure - allwith replication except the gill net) at four stations inupper Newport Bay, California yielded 51,816 fishes belonging to 46 species and weighing over 353 kg. Atherinops affinis (topsmelt) was the most abundant species accounting for 76% of total individuals. Seven species, all of low trophic levels, made up over 97% of the total catch. Mugil cephalus (striped mullet) ranked first in biomass (= 36% of the total) with six species accounting for more than 80% of the total biomass. The largest number of individuals (71%) was collected with the bag seine, the greatest number of species (35) was captured with the otter trawl and the largest percentage of the biomass (56%)was obtained with the gill net. Species richness, number of individuals and biomass were lowest in January (1978 or 1979) or March and highest in July (numbers, biomass) or September (species). Bimonthly diversity (H') values ranged from 0.48 to 2.17 (overall value 1.05) and tended to be inversely related to abundance levels. Species richness was greatest at Station 4 (the lowermost station) and least at Station 1 (the uppermost station). Numbers of individuals and biomass peaked at Station 2 and reached lowest levels at Station 1.Length-frequency analysis of six of the most abundantspecies indicated utilization of the upper bay by two ormore stages in the life history of these species.More than 92,000 eggs belonging to seven taxa and anunknown category and 426 larvae from 20 taxa were collectedwith a 0.5 m net mounted on an epibenthic sled during thesame bimonthly periods and at the same stations as thejuvenile/adult samples. Most of the eggs were collected atStation 2 in May with the numbers overwhelmingly dominatedby those of Anchoa compressa (deepbody anchovy) (99.7% oftotal numbers). The most abundant larva was that ofClevelandia ios (arrow goby). Nearly 60% of the totallarval catch was made up of members of the family Gobiidae.Larval taxa and individuals were fewest in January (1978).The number of taxa was highest in March, September andJanuary (1979) whereas larval numbers peaked in May. Thenumber of taxa and of individual larvae varied only slightlyamong the four stations.Asymptotic species accumulation curves indicated adequate sampling of juvenile/adult fishes. Cluster analysisproduced eight species groups of resident and periodicspecies that variously utilize the three main habitats(channel, inshore, pannes) in the upper bay. Speciesrichness and abundance were positively correlated with bothtemperature and salinity. Temperature, salinity and depthof capture were frequently correlated with individual species abundances and were used in combination to partially explain the spatial utilization of species and species groups.The upper bay fish community is important and worthy ofpreservation for at least three reasons: 1) it containsspecies assemblages not duplicated in any other coastalenvironment; 2) it contains life history stages of avariety of coastal fish species; and 3) it contains largepopulations of small, low-trophic level species and juveniles of other species which serve as forage for larger, predatory species that are frequently of economic importance. Members of the fish community respond noticeably to altered environmental conditions such as the heavy rainfall (and accompanying low salinity and high turbidity) that occurred during the early months of 1978. The short and long term, as yet often unpredictable, fluctuations in the populations emphasize the need for periodic monitoring and for the development of a mathematical model of the fish community if it is to be thoroughly understood and properly managed. (102pp.)
    Keywords: Ecology ; Biology ; fish ; ecology ; Newport Bay ; California ; Atherinops affinis ; topsmelt ; Mugil cephalus ; striped mullet ; deepbody anchovy ; Anchoa compressa ; arrow goby ; Clevelandia ios
    Repository Name: AquaDocs
    Type: monograph
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