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  • Fisheries  (9)
  • AERODYNAMICS
  • Cell & Developmental Biology
  • Chemistry
  • Humans
  • California Department of Fish and Game, Marine Resources Division  (9)
  • 2020-2022  (9)
  • 1980-1984
  • 1970-1974
  • 1
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    An informational summary on elasmobranchs in Elkhorn Slough (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/379 | 8 | 2011-09-29 22:08:20 | 379 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: Shark angling derbies have been held in Elkhorn Slough since 1946, and archery derbies since about 1973. Elkhorn Slough is an important pupping and breeding area for leopard sharks, Triakis semifasciata, and bat rays, Myliobatis californica, and a spawning or nursery area for many other species of fish. With the establishment of the Monterey BayNational Marine Sanctuary, these derbies, especially the archery derby, have become somewhat controversial.Leopard sharks pup in late spring to early summer, peaking in June.Bat ray pupping peaks in July. Both species breed shortly after pupping.Since 1988, most sharks and rays caught in the angling derbies have been tagged and released under a program developed by Moss Landing Marine Laboratories. No tags have been recovered, suggesting a large population in the area. Prior to the tagging program most sharks and rays taken in the angling derby were rendered at the local tallow works.All sharks and rays that are taken in the archery derby are killed, but relatively few sharks and rays are taken by archers. In 1993,43 sharks and rays were kept by anglers and 13 by archers.The commercial catch of leopard sharks in California averaged 43,000 pounds from 1990 to 1992, and the estimated sport catch of leopard sharks is about 270,000 pounds annually. In comparison, the take during Elkhorn Slough shark derbies is not significant and is not considereda threat to the resource. However, the moral or ethical issue of conducting shark derbies in a marine sanctuary remains. (7pp.)
    Keywords: Fisheries ; Biology ; leopard shark ; Triakis semifasciata ; bat ray ; Myliobatis californica ; Elkhorn Slough ; California ; sport fishing
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    Biological characteristics of the catch from the 1991-92 Pacific herring, Clupea pallasi, roe fishery in San Francisco Bay and Tomales Bay (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/367 | 8 | 2011-09-29 22:11:15 | 367 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: The Tomales-Bodega Bay catch during the past two seasonshas been from the northern part of outer Bodega Bay, dueto the closure of the Tomales Bay fishery.In the Tomales-Bodega Bay area, 4-, 5-, and 6-yr-oldherring, Clupea pallasi, comprised 84% by number of the1991-92 season's gill net catch.The number of 4-yr-olds increased to 26% of the gill netcatch, the second consecutive year that the percentage of 4yr-olds has increased. Four-yr-olds are completely recruited into the gill net fishery, and thus are a good indicator of relative year class strength.Average length of herring in the Tomales-Bodega Bay areagill net catch decreased due to a shift to younger herringin the catch.Herring age and size data obtained from Tomales Bay with avariable-mesh research gill net were similar to data fromSan Francisco Bay obtained with the same net. Herring over7-yrs-old were absent from the Tomales Bay variable-meshgill net and the outer Bodega Bay commercial gill net samples.In San Francisco Bay, the age composition of the gill netcatch was again 4-, 5-, and 6-yr-old herring, whichcomprised 87% of the catch. In the round haul fishery, 3and4-yr-old herring dominated, comprising 63% of the catch.Recruitment of 2-yr-old herring was poor.The average length of herring in the San Francisco Bay gillnet catch was the lowest on record, 189 mm body length (BL).The average length of herring in the round haul catchincreased to 179 mmBl due to poor recruitment of youngherring. (25pp.)
    Keywords: Management ; Fisheries ; Biology ; Pacific herring ; Clupea pallasi ; roe fisheries ; San Fancisco Bay ; Tomales Bay ; California
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    Type: monograph
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  • 3
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    Artificial reef plan for sport fish enhancement (2021)
    California Department of Fish and Game, Marine Resources Division | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/357 | 8 | 2011-09-29 22:09:59 | 357 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-28
    Description: Hard bottom substrate provides habitat for a multitude of marine fishes, invertebrates, and plants - particularly giant kelp - which are of direct and indirect importance to sport and commercial fisheries. These reefs also enhanceesthetic uses of the marine environment. This document sets forth the plan of the California Department of Fish and Game (CDFG) for the construction of artificial reefs.The plan includes an outline for defining the purpose of reef construction, gathering information pertinent to reef placement and design, selecting a reef site, preparing a project narrative, obtaining permits and approvals for reef construction, developing a general permit for reef construction, and establishing a system of fisheries habitat enhancement areas. Procedures for constructing and mappingreefs are discussed and an outline for conducting short- and long-term biological studies of reef communities is presented.Since 1958, CDFG has constructed 31 reefs off southern California. Thirteen of the largest and most frequently used reefs were mapped using hydroacoustic and radio-locating techniques. Maps of these reefs were published in a 1989 CDFG booklet entitled "A Guide to the Artificial Reefs of Southern California".Since 1978, seven developmental reefs have been constructed: 1) Pendleton Artificial Reef (1980) - San Diego County; 2) Pitas Point Artificial Reef (1984) Ventura County; 3) Marina Del Rey Artificial Reef (1985) - Los Angeles County; 4)Oceanside Artificial Reef (1987) - San Diego County; 5) Pacific Beach Artificial Reef (1987) - San Diego County; 6) Santa Monica Artificial Reef (1987) - LosAngeles County; and 7) Topanga Artificial Reef (1987) - Los Angeles County. These reefs were built to improve habitat for sport fishes and associated fauna and to evaluate the enhancement characteristics of reefs related to geographiclocation, depth, height, rock size, and reef spacing.Short-term studies revealed that all reefs have provided shelter, food, nesting, and nursery areas for important fish species and have increased sport fishing opportunities. Furthermore, giant kelp has been observed on all reefs built at suitable depths. More extensive long-term studies are planned in 1998 when reef communities will be at successional equilibrium. These studies will provideadditional information concerning the long-term potential of artificial reefs as habitat for sport fish, invertebrates, and plants.The plan discusses different types of man-made reefs, including developmental, production, and fishing access reefs, and provides examples of each. It documentsCDFG policy regarding the use of reefs as mitigation for impacts on rocky habitat and kelp. It also documents the laws authorizing CDFG to administer reef construction and studies in California. The activities involved in designing,permitting, constructing, and evaluating Pendleton Artificial Reef are provided as an example of the reef building and study process.A list of reefs is provided to document the location, depth, area, materials, and funding sources for all reefs constructed and/or augmented in California. (85pp.)
    Keywords: Fisheries ; Biology ; kelp
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    Type: monograph
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  • 4
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    Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1991-92 spawning-ground surveys (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/365 | 8 | 2011-09-29 22:10:57 | 365 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-28
    Description: The spawning biomass of Pacific herring, Clupeapallasi, estimated from spawning-ground surveys inSan Francisco Bay declined to 41,000 tons this season.This was the second consecutive year that the SanFrancisco Bay herring population estimate has declined.In Tomales Bay, the 1991-92 season spawning biomassestimate, including the catch of 24 tons from Bodega Bay,was 1,238 tons. This was the third consecutive seasonthat the Tomales-Bodega area herring population hasincreased.The 1991-92 Humboldt Bay herring spawning biomass estimateof 225 tons, was nearly half of last season's estimate of400 tons.December and January were the peak months of spawningactivity in all areas surveyed.In San Francisco Bay, the first major spawn since the 1981-82 season occurred in the Sausalito area, and the Oakland-Alameda area accounted for 50% of all spawning activity.A total of 3.5 million m2 of eelgrass, Zostera marina,was measured in Tomales Bay this season. The eelgrassdensity declined in most beds this season. (46p.)
    Keywords: Management ; Fisheries ; Biology ; Pacific herring ; Clupea pallasi
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  • 5
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    A profile of the Monterey squid fleet in 1992 (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/372 | 8 | 2011-09-29 22:09:45 | 372 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-29
    Description: There were approximately 20 vessels active in the 1992 Monterey Bay squid fishery. The size of the fleet has not changed since the early 1970's when 15 to 20 vessels participated in the fishery.Since 1977, eleven steel hulled vessels have been addedto the fleet, replacing smaller wooden hulled vessels that were in use during the 1960's. The hold capacity of the new fleet remains about 800 tons, because the new larger vessels replaced small vessels that used lighters (20 - 25 ton capacity non-motorized barges).Purse seines were legalized in 1989 and have replacedlamparas which were in use during the 1960'S and 1970's.Seines used in the squid fishery are small and shallow,ranging from 120 to 200 fm in length with most lessthan 25 fm deep.Crew size has been reduced nearly 50% by the addition of net reels, power blocks, submersible fish pumps, and vacuum pumps used for unloading at dockside.In the 1970's flasher type fathometers were used by the fleet and few vessels had navigational aids. Today mostof the fleet have sonar, radar, and loran C. Three vessels carry global positioning systems.In 1988 squid attracting lights were legalized and theentire fleet used lights during the 1992 season. (21pp.)
    Keywords: Fisheries ; squid
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    Type: monograph
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  • 6
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    Biological characteristics of the gill net catch from the 1989-90 Pacific herring, Clupea pallasi, roe fishery in California (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/99 | 8 | 2011-09-29 22:36:10 | 99 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: The Tomales-Bodega Bay catch this season was from northernBodega Bay, and the possibility that this season's catchmay be from a different stock must be considered.In the Tomales-Bodega Bay area, 5- through 8-yr-old herring, Clupea pallasi, comprised 89% by number of the 1989-90 season's gill net catch.Recruitment of the 1986 year class (4-yr olds) was relatively poor, comprising only 9% of the gill net catch by number.Average length of the Tomales-Bodega Bay area gill netcatch increased to 204 mm BL because the number of 3- and4-yr olds in the catch decreased to 11%, the lowest levelsince the 1982-83 season.The average weight at age of 4-through 8-yr-old herring didnot change significantly this season.In San Francisco Bay, for the first time since the 1982-83season, 5-, 6-, and 7-yr-old herring were the dominant agegroups comprising 79% by number of the gill net catch. Thisreverses a trend toward younger and smaller herring in thegill net catch.The average length of herring in the San Francisco Bay gillnet catch increased to 196 mm BL.The change in the size and age composition is attributed tobetter enforcement of the 2 1/8 in. gill net mesh regulation.The sex ratio of the gill net catch also improved.Females comprised 53% of the catch in both San Francisco and Tomales bays. (19pp.)
    Keywords: Fisheries ; Biology ; Pacific herring ; Clupea pallasi ; California
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  • 7
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    Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1989-90 spawning-ground surveys (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/97 | 8 | 2011-09-29 22:36:08 | 97 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: The 1989-90 spawning biomass estimate of Pacific herring,Clupea pallasi, from spawning-ground surveys in SanFrancisco Bay was 71,000 tons, a 5,000 ton increase over the 1988-89 biomass estimate of 66,000 tons. The San Francisco Bay herring biomass has been on an upward cycle since 1984, and results from spawning-ground surveys indicated that the population was at its highest level in eight years.In Tomales Bay the 1989-90 herring spawning biomass estimate was 345 tons. This was the third consecutive poor season. Herring have nearly abandoned Tomales Bay, and reduced freshwater in flows due to the current drought condition in California were the probable cause for the change in spawning behavior.An additional 445 tons were found in Bodega Bay byhydroacoustic surveys. The total herring biomass estimatefor Tomales-Bodega area was 790 tons.January was the month of peak spawning activity in SanFrancisco Bay, with 30,000 tons of herring spawning duringthe month. In Tomales there was only one spawning run; itoccurred on January 31, 1990.In San Francisco Bay, 67% of all spawning occurred along the San Francisco waterfront, and only 6% of all spawningactivity was in the northern part of the bay. No spawningwas found near Tiburon, Belvedere, Richmond, Berkeley,Candlestick Point, Sierra Point, Oyster Point, or CoyotePoint.A total of 3.5 million m2 of eelgrass, Zoster marina, wasmeasured in Tomales Bay this season, a decline of about10% over the past two seasons.Eelgrass density kg/m2 did not change significantly thisseason. (34pp.)
    Keywords: Ecology ; Fisheries ; Biology ; Pacific herring ; Clupea pallasi ; California ; Tomales Bay ; San Francisco Bay ; California
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  • 8
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    Biomass estimates of Pacific herring, Clupea pallasi, in California from the 1990-91 spawning-ground surveys (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/100 | 8 | 2011-09-29 22:35:37 | 100 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: The spawning biomass of Pacific herring, Clupea pallasi,estimated from spawning-ground surveys in San Francisco Baydeclined to 45,850 tons this season, following a peak of71,000 tons in the 1989-90 season. This is the first majordecline since the 1983-84 El Nino.In Tomales Bay the 1990-91 spawning biomass more thandoubled to 779 tons. The spawning biomass has increasedthe past two seasons, while the fishery has been closed.There was no biomass estimate for Bodega Bay, but anadditional 95 tons of herring were caught in Bodega Baythis season. The total herring biomass for the Tomales-Bodega area is a minimum of 874 tons.Humboldt Bay was surveyed by the Department for the firsttime this season, and spawning biomass was estimated to be400 tons.January was the month of peak spawning activity in allspawning areas surveyed.In San Francisco Bay, 62% of all spawning occurred alonqthe San Francisco waterfront; for the first time therewas no significant spawninq in the northern part of the bay. Nearly 70% of the spawning activity in San Francisco Bay occurred on January 3-6, 1991.A total of 3.5 million m2 of eelgrass, Zostera marina,was measured in Tomales Bay this season. The change ineelgrass density this season varied from bed to bed, however the overall density of eelgrass in Tomales Bay declined. (44pp.)
    Keywords: Fisheries ; Biology ; Pacific herring ; Clupea pallasi ; California
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  • 9
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    Biological characteristics of the catch from the 1990-91 Pacific Herring, Clupea pallasi, roe fishery in California (2021)
    California Department of Fish and Game, Marine Resources Division | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/363 | 8 | 2011-09-29 22:10:51 | 363 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-28
    Description: The Tomales-Bodega Bay catch during the past two seasonshas been from the northern part of Bodega Bay, due to theclosure of the Tomales Bay fishery.In the Tomales-Bodega Bay area, 4-, 5-, and 6-yr-old herringClupea pallasi, comprised 79% by number of the 1990-91season's gill net catch.The number of 4-yr olds (1987 year class) increased to 21%of the gill net catch. Four-yr olds are an indicator of recruitment strength into the gill net fishery.Average length of herring in the Tomales-Bodega Bay areagill net catch decreased due to a shift to younger herringin the catch, as well as, poor growth characteristics during1990. Herring age and size data obtained from Tomales Bay with avariable mesh research gill net were similar to data from San Francisco Bay obtained with the same net. All age classes were taken and herring ranged in length from 148 mm to 226 mm.In San Francisco Bay, the age composition of the gill netcatch was also primarily 4-, 5-, and 6-yr-old herring, whichcomprised 79% of the catch. In the round haul fishery 2- and3-yr-old herring dominated, comprising 72% of the catch.The average length of herring in the San Francisco Bay gillnet and round haul catches decreased. Both are the lowestrecorded average lengths by the respective gear types exceptfor the 1983-84 El Nino season.Observed poor growth characteristics this season are attributed to reduced upwelling off central California in 1990. (26pp.)
    Keywords: Management ; Fisheries ; Biology ; Pacific Herring ; Clupea pallasi ; roe fisheries ; California
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    Type: monograph
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