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  • Fisheries  (8)
  • Environment  (2)
  • Aircraft Stability and Control
  • GENERAL
  • Inorganic Chemistry
  • California Department of Fish and Game  (10)
  • 2020-2023
  • 2020-2022  (10)
  • 1955-1959
  • 1
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    The speckled scallop, Argopecten circularis, in Aqua Hedionda Lagoon, San Diego County, California (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/724 | 8 | 2011-09-29 21:38:24 | 724 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Speckled scallops, Argopecten circularis (Sowerby, 1835), were sampled at Agua Hedionda Lagoon, Carlsbad, San Diego County from March 1984 to October 1986, to obtain basic life history data. Monthly samples of scallops were collected, measured, and released to obtain length frequency data for estimates of growth, life span, and spawning period. Subsamples of scallops were collected for determination of gonadal-somatic and adductor muscle-somatic indices.In 1984 large concentrations of speckled scallops were found on the sand-silt bottom of the lagoon, closely associated with eelgrass, Zostra marina. During the course of the study the numbers of scallops declined, until their virtual disappearance at the end of 1986. Monthly length frequency plots from 24,375 scallop measurements indicate that this is a rapidly growing species with a short life span. Gonadal- and adductor muscle-somatic indices from subsamples of 1,714 scallops indicate first spawning at age one and a relationship between temperature and spawning.Based on this study management recommendations are made for the speckled scallop. (39pp.)
    Keywords: Management ; Fisheries ; Biology ; speckled scallop ; Argopecten circularis ; Aqua Hedionda Lagoon ; San Diego ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    Red abalone size data from Johnsons Lee, Santa Rosa Island, collected from 1978 to 1984 (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/720 | 8 | 2011-09-29 21:39:31 | 720 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Red abalone, Haliotis rufescens, were collected at Johnsons Lee, Santa Rosa Island, in the summers of 1978 through 1982, and in 1984, to obtain data for determining various fishery population parameters. Annual visits to the study site were made at yearly intervals to simplify growth calculations.During the first four visits, 2145 red abalones were tagged,measured, and replaced. Shell damage, soft tissue injuries, and causes of mortality were noted. The method of tagging isdescribed.Recovery of first tagged abalone after one year was approximately 30%. Analysis of variance of the annual samples indicated that the samples were, with one exception, not different. Summaries are presented of the number of abalone collected and tagged by year, frequencies of shell damage, soft tissue injury, predatory sponge infestation, and total mortality. Appendices include a listing of the raw size data and various codes for each tagged abalone. (56pp.)
    Keywords: Management ; Fisheries ; Biology ; Red abalone ; Haliotis rufescens ; Santa Roas Island ; California
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    Type: monograph
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  • 3
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    Evaluation of salmon and steelhead spawning habitat quality in the South Fork Trinity River Basin, 1997 (2021)
    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
    Details
    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
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  • 4
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    Maturation and growth of jack mackerel, Trachurus symmetricus (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/685 | 8 | 2011-09-29 21:41:47 | 685 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Biological knowledge of jack mackerel is not extensive,and as yet no information on maturity or growth ratehas been documented. Analysis of fish caught in theSouthern California Bight indicates a spawning seasonfrom March through October. By the end of their firstyear, most females (70%) are capable of spawning, andthe percentage increases with age.Weight-length curves were calculated for a 2 monthperiod (July and August), and for the entire year. Avon Bertalanffy growth curve was determined fromJuly-August data to represent size of each age groupnear the designated August 1 birthdate. (328pp.)
    Keywords: Fisheries ; Biology ; jack mackerel ; Trachurus symmetricus ; California ; age and growth
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    Type: monograph
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  • 5
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    Silver King Creek Paiute cutthroat trout restoration, 1991 through 1993 (2021)
    California Department of Fish and Game | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/2906 | 8 | 2011-09-29 18:10:32 | 2906 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: Silver King Creek, Alpine County, is the native range of the Federally-threatened Paiute cutthroat trout, Oncorhynchus clarki seleniris. Paiute cutthroat currently inhabit Coyote Valley and Corral Valley creeks, which are tributaries to Silver King Creek below Llewellyn Falls, and also Silver King Creek and tributaries aboye Llewellyn Falls. Rainbow trout, O. mykiss, were introduced into the basin during 1949 and became hybridized with Paiute cutthroat. Chemical treatments attempted by the California Department of Fish and Game (CDFG) in 1964 and 1976 failed to eliminate hybrid trout. A chemical treatment project was again conducted by the CDFG from 1991 through 1993 to eliminate hybrid trout from within the range of Paiute cutthroat. This report presents a summary of events for the first two years of the Silver King Paiute Cutthroat Trout Restoration Project; a more thorough analysis is made of the third and final year of the project.(PDF contains 39 pages.)
    Description: Silver King Paiute Cutthroat Trout Restoration Project
    Keywords: Management ; Conservation ; Fisheries ; Aquaculture ; rainbow trout ; Paiute cutthroat trout ; fish stocking ; fish planting ; Oncorhynchus mykiss ; Oncorhynchus clarki seleniris ; Silver King Creek ; Alpine County ; species introduction ; Silver King Paiute Cutthroat Trout Restoration Project
    Repository Name: AquaDocs
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  • 6
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    The natural resources of Elkhorn Slough: their present and future use (2021)
    California Department of Fish and Game | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/482 | 8 | 2020-08-24 03:46:17 | 482 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-30
    Description: This report summarizes the history of the slough, ecological attractions, educational value, and problems facing its continued existence. Appended references provide the interested and concerned citizen with sources of more specific information.As a result of the initial survey of estuarine areas of California(California Department of Fish and Game, 1969), the critical status of the coastal marshes became obvious. This report on Elkhorn Slough is part of the high priority inventory and assessment of coastal wetlands by the Department of Fish and Game, and it is intended as a guide for citizens, planners, administrators, and all others interested in the use and development of coastal lands and waters. As such, this report transcends local issues on pollution and development and, in fact, documents the status and future of natural resources that should be a part of the inheritance of following generations.This publication is one of a scheduled series. It follows similar documents on Upper Newport Bay (orange county), Goleta Slough (Santa Barbara County) and the Bolinas Lagoon (Marin county). (Document has 126 pages)
    Keywords: Conservation ; Pollution ; Biology ; Environment ; Elkhorn Slough ; Monterey County ; Moss Landing
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    Type: monograph
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  • 7
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    Natural resources of Lake Earl and Smith River Delta (2021)
    California Department of Fish and Game | Sacramento, CA
    In:  http://aquaticcommons.org/id/eprint/546 | 8 | 2020-08-24 03:49:33 | 546 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-30
    Description: The Lake Earl/Smith River Delta area is a key coastal wetland situated in northern California. The Lake and Delta have retained much of their value to wildlife and serve as an important link in a chain of such wetlands that extend southward along the Pacific Ocean from Alaska to South America. Millions of water-associated birds of the Pacific Flyway utilize these areas as feeding and resting stops along their migration paths. In California, these wetlands also serve as a significant portion of the available wintering grounds for a major share of the birds within the flyway.The Smith River is also one of the State's most productive salmon and steelhead streams. Anadromous fish produced here provide thousands of angler use days to sport fishermen and contribute substantially to the commercial fishing catch off the northern coast.Because of the importance of coastal wetlands to the fish and wildlife of California, the Department of Fish and Game has initiated a high priority statewide inventory and assessment of these wetlands. This publication is an integral part of that program.This report identifies specific resources and uses; directs attention to problems; and recommends courses of action needed to insure resource protection. It is intended as a guide for citizens, planners, administrators and other interested in the use and development of California'scoastal land and waters. (132pp.)
    Keywords: Conservation ; Pollution ; Biology ; Environment ; Lake Earl ; Smith River Delta ; California ; Conservation ; Pollution ; Natural Resources
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    Type: monograph
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  • 8
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    The status of the California Barracuda resource and its management (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/662 | 8 | 2011-09-29 21:43:45 | 662 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-01
    Description: The California barracuda, Sphyraena argentea, has beenfished commercially for over 70 years. Peak landings weremade during the early 1920's and have since declined to anincidental level. The present interest in barracuda centersaround its desirability as a game species.Recent estimates of barracuda abundance indicate thepopulation is at a low level and in need of increasedmanagement efforts. (21pp.)
    Keywords: Management ; Fisheries ; Biology ; California Barracuda ; Sphyraena argentea
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  • 9
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    Age composition of California landings of Bluefin tuna, Thunnus thynnus, 1963 through 1969 (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/706 | 8 | 2011-09-29 21:40:14 | 706 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: California landings of bluefin tuna, Thunnus thynnus, were sampled for age and size composition from 1963 through 1969. Scales were used to determine the age.Landings primarily consisted of 1- and 2-year old fish. The maximum age found was 6 years old. Strong year-classes of 1960 and 1961 combined to produce high catches in 1962 and 1963. Two year old fish appear to arrive in our fishery earlier than 1-year olds. (44pp.)
    Keywords: Management ; Fisheries ; Biology ; bluefin tuna ; Thunnus thynnus ; California
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  • 10
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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
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    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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