DOCSLIB.ORG

Long-Term Fluctuations in Gonatid Squid (Gonatidae) Abundance in the Okhotsk Sea

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Long-Term Fluctuations in Gonatid Squid (Gonatidae) Abundance in the Okhotsk Sea Pacific Research Institute of Fisheries and Oceanography (TINRO-Centre) Long-term fluctuations in gonatid squid (Gonatidae) abundance in the Okhotsk Sea Mikhail A. Zuev Nikolai S. Vanin Oleg N. Katugin Gennady A. Shevtsov The main goal reveal annual distribution patterns of squids of the family Gonatidae in the Sea of Okhotsk basing on data collected in TINRO-Centre research surveys with a purpose to estimate the role of these cephalopods in pelagic communities Methods: – analyze database on squid catches for a period from 1990 to 2008; – use the data to obtain patterns of spatial and seasonal on squid distribution and biology; – assess the role of different species in seasonal dynamics of distribution density in the epi- and mesopelagic layers in different years; – use synoptic observations to reveal relationships between squid distribution density and variability in atmospheric pressure in the study area Upper-mesopelagic Region expeditions investigations years (expeditions) northern Okhotsk Sea 20 12 1990-2008 southern 18 2 1990-2008 Okhotsk Sea off west 12 7 1998-2007 Kamchatka the entire Okhotsk Sea 25 13 1990-2008 - Investigations of epipelagic (0-200 m) - Investigations of epipelagic and upper- mesopelagic (200-500 m) northern Okhotsk Sea Kamchatka Biomass density (kg/km2) of the Gonatidae in the northern Okhotsk Sea kg/km2 0,6 2 - Berryteuthis magister 0,5 4000,4 - Gonatus madokai 0,3 2000,2 0,1 0 w w s s о w s s о w s s о w s s о w s s о о w s s о w s s s о 1991 ] [ 1993][1994 1995 ][ 1997 1998 1999 2000 1,2 - Boreoteuthis borealis 32001,1 1 - Gonatopsis japonicus 0,9 -epipelagic 14000,8 - Gonatus tinro 0 – 200 m 0,7 - Gonatidae 0,6600 0,5 0,4400 - upper 0,3 mesopelagic 0,2200 200 – 500 m 0,1 0 s s s о w s s s о w s s s о w s s s о w s s s о w s s о w 2001 2002 ][ 2003 2004 2005 2006][2007 2008 Biomass density (kg/km2) of the Gonatidae in the northern Okhotsk Sea in different years in spring in the upper 500 m layer kg/km2 240 200 160 120 80 40 0 2001 2002 2004 2005 2006 kg/km2 GSP GMA 160 BBO BMA 120 80 40 0 2001 2002 2004 2005 2006 GSP – Gonatidae sp; BBO – B. borealis; GMA – G. madokai; BMA – B. magister Biomass density (kg/km2) of the Gonatidae in the northern Okhotsk Sea in different years in spring in the upper 500 m layer. 1,0 kg/km2 the share of each species 240 0,8 in the epipelagic zone (0–200 m) 200 0,6 160 120 0,4 80 0,2 40 0,0 0 2001 2002 2004 2005 2006 2001 2002 2004 2005 2006 kg/km2 GSP GMA Correlation coefficients 160 BBO BMA 120 0-500 BMA GMA 80 GMA -0,125 40 BBO 0,742 -0,194 0 2001 2002 2004 2005 2006 GSP – Gonatidae sp; BBO – B. borealis; GMA – G. madokai; BMA – B. magister Biomass density (kg/km2 ) of squids Berryteuthis magister and Boreoteuthis borealis Berryteuthis magister Boreoteuthis borealis Novemberноябрь - Decemberдекабрь 2008 Novemberоктябрь - Decemberдекабрь 2007 60° 60° 55° 55° 50° 50° - безno catshулова 45° - менееless 100 100 45° - 100 - - 10000 10000 - moreболее 10000 140° 145° 150° 155° 140° 145° 150° 155° Biomass density (kg/km2) and size of squids Berryteuthis magister and Boreoteuthis borealis Berryteuthis magister2 2 ноябрьBd=333 - декабрь kg/km 2008 Bd=36 kg/km 60° 60° 55° 55° 140° 145° 150° 155° 140° 145° 150° 155° 14000 350 N 12000 300 N=25089 10000 250 Ср.=70мм N=1230 8000 200 Ср.=80мм 6000 150 4000 100 2000 50 41 9 67 1 0 11 0 0 50 60 70 80 90 100 110 120 130 140 150 160 40 50 60 70 80 90 100 110 120 130 140 dorsal mantle length, mm Biomass density (kg/km2) of Gonatus madokai in the upper epipelagic zone (0-50 m) in September-October 2003 Bd=2603 kg/km2 60° 55° 50° - безno уловаcatch 45° - менееless 100 100 - 100100 - -10000 10000 - болееmore 10000 140° 145° 150° 155° 160° Size of Gonatus madokai on the shelf (А) and continental slope (B) in September-October 2003 60° 55° N 60000 160 50000 N=157254 А 120 N=173 50° 40000 Ср.=44 мм Ср.=127мм 30000 80 20000 - без улова 40 45° - менее 100 10000 - 100 - 10000 90 - более 10000 0 0 140° 145° 150° 155° 160° 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 18000 250 15000 200 B N=47794 N=769 12000 Ср.=39мм 150 Ср.=147мм 9000 100 6000 50 3000 0 0 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 260 310 dorsal mantle length, mm Biomass density (kg/km2) of the Gonatidae in the southern Okhotsk Sea -epipelagic - upper 0 – 200 m mesopelagic 200 – 500 m kg/km2 1 - Boreoteuthis borealis - Gonatopsis japonicus 0,9 - Berryteuthis magister - Gonatopsis octopedatus 0,8800 0,7 - Gonatus kamtschaticus - Gonatus tinro 0,6 600 - Gonatus madokai 0,5 0,4400 - Gonatidae 0,3 0,2200 0,1 0 w w s s о w s s о w s s о w s s о w s s о w s s о w s s о w s s о w s s s о w s s о w s s о w s s о 1991][1992 1993 1994 1995 ][ 1997 1998 1999 2000 ][2002][2003 2004 2007 2008 Boreoteuthis borealis Vertical distribution during daytime and at night in the Bering Sea Number sp. 1,0 2,0 3,0 tons/km3 46,0 0,3 0,6 0,9 1,2 tons/km3 120 90 0 м 60 N night=359 adult 30 juvenal 0 20 40 м N day=2 40 40 N night=359 0 day 20 80 м 80 80 N night=37 night 0 20 120 м N day=2 120 120 N night=120 0 20 160 м 160 160 N night=24 0 20 200 м N day=2 200 200 N night=10 0 20 350 м N day=7 350 350 N night=28 0 20 500 м N day=25 500 500 N night=10 0 20 750 м N day=12 деньday nightночь 750 750 N night=9 0 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 DML, mm Biomass density (kg/km2) of Boreoteuthis borealis in the epipelagic zone (0-200 m) in September – November in 1998 and 2000 1998 Bd=810 kg/km2 2000 Bd=125 kg/km2 60° 60° 55° 55° 50° 50° - безno catshулова 45° - менееless 100 100 45° - 100 -- 10000 10000 - moreболее 1000010000 140° 145° 150° 155° 140° 145° 150° 155° Biomass density (kg/km2) Gonatidae in the epipelagic and upper mesopelagic zones during winter, December 1990 – January 1991 0 –0 - 200200м m 200 –200 500 - 500 mм 2 2 60° Bd=72 kg/km 60° Bd=431 kg/km 55° 55° 50° 50° - безno улова catsh - менееless 10 10 - 10 - – 100 100 45° - 100100-1000 - 1000 45° - moreболее 10001000 140° 145° 150° 155° 140° 145° 150° 155° Share (%) of Gonatidae species in the epipelagic and upper mesopelagic during winter, December 1990 – January 1991 - Boreoteuthis borealis - Gonatus tinro - Berryteuthis magister - Gonatopsis octopedatus - Gonatus madokai - Gonatidae Bd=72 kg/km2 Bd=431 kg/km2 45% 0 – 2000 - 200 mм 200 –200 500 - 500м m 40% 23%60° 13% 60° 22% 17% 25% 55° 55° 50° 50° - безno улова catsh - менееless 1010 - 10 - –100 100 45° - 100-1000100 - 1000 45° - moreболее 1000 1000 140° 145° 150° 155° 140° 145° 150° 155° 2 Biomass density (kg/km ) of the - epipelagic - upper Gonatidae off the west Kamchatka in 0 – 200 m mesopelagic the Okhotsk Sea 200 – 500 m kg/km2 1,4 54001,3 - Gonatus tinro - Berryteuthis magister 1,2 1,1 -Gonatus onyx - Boreoteuthis borealis 20001 0,9 -Gonatus kamtschaticus 18000,8 - Gonatus madokai 0,7 0,6 0,5 0,4400 0,3 0,2200 0,1 0 s s о w s s о w s s о w s s о w s s s о w s s s о w s s о w s s s о w 1998 1999 2000 2001 2002 ][ 2003 2004 2005 2006 ][ 2007 Baric observations in the Okhotsk Sea 3 2 1 0 -1 -2 -3 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 Anomaly of the difference in atmospheric pressure between Nikolaevsk- na-Amure and Petropavlovsk-Kamchatski with different time of data averaging : Blue line – 7 months; Red line – 25 months; Black line – 61 months. Points – observations of atmospheric pressure during trawl survey Biomass density (kg/km2) of the Gonatidae in the northern Okhotsk Sea kg/km2 0,6 2 - Berryteuthis magister 0,5 4000,4 - Gonatus madokai 0,3 2000,2 0,1 0 w w s s о w s s о w s s о w s s о w s s о о w s s о w s s s о 1991 ] [ 1993][1994 1995 ][ 1997 1998 1999 2000 1,2 - Boreoteuthis borealis 32001,1 1 - Gonatopsis japonicus 0,9 -epipelagic 14000,8 - Gonatus tinro 0 – 200 m 0,7 - Gonatidae 0,6600 0,5 0,4400 - upper 0,3 mesopelagic 0,2200 200 – 500 m 0,1 0 s s s о w s s s о w s s s о w s s s о w s s s о w s s о w 2001 2002 ][ 2003 2004 2005 2006][2007 2008 Main atmospheric pressure field in Spring (March-May) 1997 2003 & 2004 2007 Atmospheric pressure field, favorable for penetration of warm Pacific waters into the Okhotsk Sea in spring (March-May) in 1997, 2003, 2004 and 2007.
Load more

Recommended publications
  • Forage Fish Management Plan
    Oregon Forage Fish Management Plan November 19, 2016 Oregon Department of Fish and Wildlife Marine Resources Program 2040 SE Marine Science Drive Newport, OR 97365 (541) 867-4741 http://www.dfw.state.or.us/MRP/ Oregon Department of Fish & Wildlife 1 Table of Contents Executive Summary ....................................................................................................................................... 4 Introduction .................................................................................................................................................. 6 Purpose and Need ..................................................................................................................................... 6 Federal action to protect Forage Fish (2016)............................................................................................ 7 The Oregon Marine Fisheries Management Plan Framework .................................................................. 7 Relationship to Other State Policies ......................................................................................................... 7 Public Process Developing this Plan .......................................................................................................... 8 How this Document is Organized .............................................................................................................. 8 A. Resource Analysis ....................................................................................................................................
    [Show full text]
  • ICES Marine Science Symposia
    ICES mar. Sei. Symp., 199: 459-467. 1995 Genetic differentiation in Berryteuthis magister from the North Pacific O. N. Katugin Katugin, O. N. 1995. Genetic differentiation in Berryteuthis magister from the North Pacific. - ICES mar. Sei. Symp., 199: 459-467. Berryteuthis magister is a widespread quasibenthic commercial squid from the North Pacific. Intraspecific genetic differentiation was determined by allozyme electrophore­ tic analysis. Eighteen sample lots (2100 individuals) from geographically separated North Pacific regions were subjected to allozyme electrophoretic analysis using a total of 14 enzymes and unidentified ganglion protein spectra with polymorphic zones. Four loci with variant allele frequencies greater than 0.05 were found to be useful for population studies. No significant violations of the Hardy-Weinberg equilibrium were found at any loci in the samples. There was no evidence of genetic differences between sexes. Analysis of genetic differentiation using Wright’s F-statistics, cluster analysis of genetic distances, and contingency chi-square analysis suggested that there are popu­ lation differences between squids from the three major geographical localities: the Sea of Japan, the Kurile-Komandor region, and the Gulf of Alaska. Genetic divergence between squid from the Kurile-Komandor part of the species range probably reflects subpopulation differentiation of local stocks from successive generations. O. N. Katugin: Pacific Research Institute o f Fisheries and Oceanography (TINRO), Vladivostok, 690 600, Russia [tel: (+7) 4232 25 7790, fax: (+7) 4232 25 7783], been investigated electrophoretically. This family is con­ Introduction sidered to be the most abundant group of cephalopods in During the last two decades biochemical genetic tech­ the subarctic waters of the Pacific Ocean where it pre­ niques based on electrophoretic separation of multiple sumably originated and diverged (Nesis, 1973).
    [Show full text]
  • Stomach Content Analysis of Short-Finned Pilot Whales
    f MARCH 1986 STOMACH CONTENT ANALYSIS OF SHORT-FINNED PILOT WHALES h (Globicephala macrorhynchus) AND NORTHERN ELEPHANT SEALS (Mirounga angustirostris) FROM THE SOUTHERN CALIFORNIA BIGHT by Elizabeth S. Hacker ADMINISTRATIVE REPORT LJ-86-08C f This Administrative Report is issued as an informal document to ensure prompt dissemination of preliminary results, interim reports and special studies. We recommend that it not be abstracted or cited. STOMACH CONTENT ANALYSIS OF SHORT-FINNED PILOT WHALES (GLOBICEPHALA MACRORHYNCHUS) AND NORTHERN ELEPHANT SEALS (MIROUNGA ANGUSTIROSTRIS) FROM THE SOUTHERN CALIFORNIA BIGHT Elizabeth S. Hacker College of Oceanography Oregon State University Corvallis, Oregon 97331 March 1986 S H i I , LIBRARY >66 MAR 0 2 2007 ‘ National uooarac & Atmospheric Administration U.S. Dept, of Commerce This report was prepared by Elizabeth S. Hacker under contract No. 84-ABA-02592 for the National Marine Fisheries Service, Southwest Fisheries Center, La Jolla, California. The statements, findings, conclusions and recommendations herein are those of the author and do not necessarily reflect the views of the National Marine Fisheries Service. Charles W. Oliver of the Southwest Fisheries Center served as Contract Officer's Technical Representative for this contract. ADMINISTRATIVE REPORT LJ-86-08C CONTENTS PAGE INTRODUCTION.................. 1 METHODS....................... 2 Sample Collection........ 2 Sample Identification.... 2 Sample Analysis.......... 3 RESULTS....................... 3 Globicephala macrorhynchus 3 Mirounga angustirostris... 4 DISCUSSION.................... 6 ACKNOWLEDGEMENTS.............. 11 REFERENCES.............. 12 i LIST OF TABLES TABLE PAGE 1 Collection data for Globicephala macrorhynchus examined from the Southern California Bight........ 19 2 Collection data for Mirounga angustirostris examined from the Southern California Bight........ 20 3 Stomach contents of Globicephala macrorhynchus examined from the Southern California Bight.......
    [Show full text]
  • Fishery Bulletin/U S Dept of Commerce National Oceanic
    Abstract.- Gastrointestinal tract contents were evaluated from Prey selection by northern fur seals 73 female andjuvenile male north­ ern fur seals (Callorhinus ursinus) fCallorhinus ursinusJ in the eastern for analysis of their diet in the Bering Sea. Fur seals were col­ Bering Sea lected from August to October of 1981, 1982, and 1985. Juvenile Elizabeth Sinclair walleye pollock (Theragra chalco­ gramma) and gonatid squid were Thomas Loughlin the primary prey. Pacific herring National Marine Mammal Laboratory. Alaska Fisheries Science Center; (Clupea pallasi) and capelin National Marine Fisheries Service. NOM <Mallotus villosus), considered im­ 7600 Sand Point Way. N.E., Seattle, Washington 98115 portant fur seal prey in previous reports, were absent from the diet. Prey species and size varied William Pearcy among years and between near­ College of Oceanography, Oregon State University shore and pelagic sample loca­ Oceanography Administration Building 104 tions. Interannual variation in the Corvaflis, Oregon 9733 J importance ofpollock in the diet of fur seals was positively related to year-class strength of pollock. Midwater (n=23) and bottom (n=116) trawls were conducted at The Pribilof Island population (St. were conducted prior to the 1975­ the location of fur seal collections George and St. Paul Islands) of 81 population decline and prior to to determine availability of fish northern fur seals (Callorhinus the 1970's development of a com­ and squid relative to prey species eaten by fur seals. The species and ursinus) represents approximately mercial walleye pollock (Theragra size composition of prey taken by 75% of the total species breeding chalcogramma) fishery in the fur seals was similar to midwater population.
    [Show full text]
  • Full Text in Pdf Format
    MARINE ECOLOGY PROGRESS SERIES Vol. 177: 115-131, 1999 Published February 11 Mar Ecol Prog Ser Diet, provisioning and productivity responses of marine predators to differences in availability of Antarctic krill J. P. Croxall*, K. Reid, P. A. Prince British Antarctic Survey, Natural Environment Research Council. High Cross, Madingley Road. Cambridge CB3 OET. United Kingdom ABSTRACT: Knowledge of relationships between prey availability and predator performance is the key to using predators as indicators of the state of marine systems and to assessing potential conse- quences of competition between natural predators and man for common resources. Fluctuations in the abundance of Antarctic knll are beiieved to have a substantial influence on the reproductive perfor- mance of krill-dependent top predator species in the Southern Ocean; few quantifications of such inter- actions exist. At South Georgia, for 2 years in which acoustic surveys revealed a major difference in knll abundance, we compared diet, prov~sioningof offspring and breeding success in 4 main predator species (2 penguins, 2 albatrosses, with supporting data from Antarctic fur seal) whose dependence on krd typically ranges from 20 to 90%. The 4-fold difference in krill biomass between 1986 (ca 30 g m-2) and 1994 (ca 7 g m-2)was accompanied by (1) an 88 to 90% reduction in the mass of krill in predator dlets (and some increase in the fish component), (2) greater prey diversity for most species, (3) reduced diet overlap between species and (4) a switch from krill to amphipods in macaroni penguin but no major dietary change in other species.
    [Show full text]
  • An Isotope Approach
    Determining Cetacean – Cephalopod Trophic Interactions – An Isotope Approach By Christine Heather Jackson Bachelor of Arts, James Cook University Graduate Diploma (Health Promotion), Curtin University of Technology Master of Science, University of Tasmania Submitted in fulfilment of the requirements for the degree Doctor of Philosophy University of Tasmania (October 2016) ii DECLARATION This thesis contains no material which has been accepted for a degree or diploma by the University or any other institution, except by way of background information and duly acknowledged in the thesis, and to the best of my knowledge and belief no material previously published or written by another person except where due acknowledgement is made in the text of the thesis, nor does the thesis contain any material that infringes copyright Signed; _________________________________ Christine H. Jackson iii AUTHORITY OF ACCESS This thesis may be made available for loan and limited copying and communication in accordance with the Copyright Act 1968. Signed; _________________________________ Christine H. Jackson iv ABSTRACT Determining the biotic and abiotic influences on the distribution and abundance of marine mammals is essential for understanding the dynamics of the food chain. The predator-prey relationship can be deterministic in shaping both the community structure and function of marine ecosystems. This is especially pertinent to recovering toothed whale populations given their large size and high prey consumption rates. A greater knowledge of the trophic linkages between toothed whales and their prey will facilitate assessments of their combined impact on the ecosystem since marine food webs are a fusion of bottom-up and top-down energy and nutrient flow.
    [Show full text]
  • Redacted for Privacy William G
    AN ABSTRACT OF THE THESIS OF Elizabeth H. Sinclair for the degree of Master of Science in Oceanography presented on December 16, 1988. Title: Feeding Habits of Northern Fur Seals (Callorhinus ursinus) in the Eastern Bering Sea Abstract approved: Redacted for privacy William G. Pearcy This study was conducted to determine the composition and size of prey consumed by northern fur seals (Callorhinus ursinus) in the eastern Bering Sea. Eighty three northern fur seals were collected in the summer and fall of 1981, 1982, and 1985 forexamination of gastrointestinal contents. A total of 139 midwater and bottom trawls were collected to determine the availability of potential prey. Analysis of trawls confirmed that seals are size-selective midwater feeders during their breeding and haul-out season in the eastern Bering Sea. Juvenile walleye pollock and gonatid squid, 5-20cm in body length, were the primary prey, but seal prey varied among years and between nearshore and pelagic sample locations. Interannual variation in body sizes of walleye pollock consumed by seals was related to pollock year class strength. The identification of pollock and gonatid squid as primary fur seal prey in the eastern Bering Sea was consistent with previous reports. However, Pacific herring and capelin, previously considered important fur seal prey werE absent in this study. Feeding Habits of Northern Fur Seals (Callorhinus ursinus) in the Eastern Bering Sea by Elizabeth Hacker Sinclair A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science Completed December 16, 1988 Commencement June 1989 APPROVED: Redacted for privacy Professor of Oceanography in char.4f major Redacted for privacy Dean of C./lege of Ocean.
    [Show full text]
  • Opportunistic Sightings of Cetaceans in Nearshore and Offshore Waters of Southeast Florida
    J. Northw. Atl. Fish. Sci., Vol. 48: 21–31 Publication (Upload) date: 21 Oct 2016 Opportunistic Sightings of Cetaceans in Nearshore and Offshore Waters of Southeast Florida Denise L. Herzing 1,2 and Cindy R. Elliser 1,3 1 The Wild Dolphin Project, P.O. Box 8436, Jupiter, FL 33468 2 Department of Biological Sciences, Florida Atlantic University, 777 Glades Rd, Boca Raton, FL 33431 3 Pacific Mammal Research, 1513 A Ave, Anacortes, WA 98221 Denise Herzing: [email protected] HERZING, D. L. and C. R. Elliser. Opportunistic Sightings of Cetaceans in Nearshore and Offshore Waters of Southeast Florida. J. Northw. Atl. Fish. Sci., 48: 21–31. doi:10.2960/J.v48.m709 Abstract The majority of cetacean research pertaining to the western North Atlantic Ocean has focused on the waters between North Carolina in the United States and the Scotian Shelf in Canada; little is known about cetacean occurrence and distribution in the waters off southeast Florida (FL) where the subject study was conducted. Our study describes opportunistic, ship-based sightings of cetaceans during 1989-2006 in nearshore and offshore waters located in the Gulf Stream between the Bahamas and Palm Beach, FL. Nine species were observed during 60 sightings. For two of the documented species (false killer whale, Pseudorca crassidens, and Fraser’s dolphins, Lagenodelphis hosei), very little existing information was available with respect to sightings and distribution in the study area. The other seven species were observed in waters south of their documented distributions, based on sightings data from dedicated surveys conducted along the US East Coast, but which only extended to central FL.
    [Show full text]
  • Assessment of the Squid Stock Complex in the Gulf of Alaska
    21. Assessment of the squid stock complex in the Gulf of Alaska Olav A. Ormseth NMFS Alaska Fisheries Science Center Executive Summary Squids in the Gulf of Alaska (GOA) are managed as a single stock complex comprising approximately 15 species. Historically squids were managed as part of the GOA “Other Species” complex, which included squids, octopuses, sharks, and sculpins. In 2011, the “Other Species” group was broken up into individual stock complexes and the squid complex received its own harvest specifications. Harvest recommendations are based on an historical catch approach setting OFL equal to maximum historical catch during 1997 – 2007. In June 2017 the North Pacific Fishery Management Council moved to reclassify squid as an “Ecosystem Component” complex, meaning that once the Fishery Management Plan has been amended to reflect this decision there will no longer be annual catch limits for squids (see https://www.npfmc.org/squid-reclassification/ for more information). Summary of Changes in Assessment Inputs 1) Trawl survey data from 2017 have been added. 2) Catch data have been updated through October 11, 2017. Summary of Results 1) The 2017 trawl survey biomass estimate was 2,296 t, the lowest it has been since 1999. 2) The 2017 catch data are incomplete (29 t as of October 11), but it is likely that the 2017 catch will be low compared to 2015 (411 t) and 2016 (239 t). 3) Harvest recommendations are unchanged from the status quo. Harvest Recommendations last year this year Quantity/Status 2016 2017 2017 2018 Specified/recommended
    [Show full text]
  • 2011 GOA Squids
    21. Gulf of Alaska squids Olav A. Ormseth NMFS Alaska Fisheries Science Center Executive Summary In 2010, the North Pacific Fishery Management Council passed amendment 87 to the GOA Fishery Management Plan, which separated the Other Species complex into its constituent species groups. Thus, GOA squids are now managed as an independent complex with its own harvest specifications. Because the GOA bottom trawl survey is the chief source of data for this assessment and is a biennial survey, full assessments are performed only in odd years. Summary of Changes Changes in the input data: 1. Total catch and retention data for GOA squids has been updated with complete 2010 and partial 2011 data. 2. Biomass estimates from the 2011 GOA bottom trawl survey have been added. 3. An appendix containing data regarding non-commercial catches of squid has been added to the report. Summary of Results Because reliable estimates of squid biomass and natural mortality rate do not exist, we recommend using a modified Tier 6 approach setting OFL equal to maximum historical catch and ABC equal to 0.75 * OFL using the years 1997 - 2007 as a baseline . last year this year Quantity/Status 2011 2012 2012 2013 M (natural mortality) n/a n/a n/a n/a Specified/recommended Tier 6 6 6 6 Biomass n/a n/a n/a n/a average historical catch 1997-2007 272 272 272 272 maximum historical catch 1997-2007 1,530 1,530 1,530 1,530 Recommended OFL (max. hist. catch; t) 1,530 1,530 1,530 1,530 Recommended ABC (0.75*OFL; t) 1,148 1,148 1,148 1,148 As determined last As determined this Status year for: year for: 2009 2010 2010 2011 Overfishing No n/a No n/a Overfished n/a n/a n/a n/a Approaching overfished n/a n/a n/a n/a (for Tier 6 stocks, data are not available to determine whether the stock is in an overfished condition) Introduction Description, scientific names, and general distribution Squids (order Teuthoidea) are cephalopod molluscs which are related to octopus.
    [Show full text]
  • THE PINNIPEDS of the CALIFORNIA CURRENT California
    ANTONELIS AND FISCUS: PINNIPEDS OF THE CALIFORNIA CURRENT CalCOFI Rep., Vol. XXI, 1980 THE PINNIPEDS OF THE CALIFORNIA CURRENT GEORGE A. ANTONELIS. JR. AND CLIFFORD H. FISCUS Marine Mammal Division Northwest and Alaska Fisheries Center National Marine Fisheries Service National Oceanic and Atmospheric Administration 7600 Sand Point Way, N.E. Seattle, WA 981 15 ABSTRACT 10s pequenos peces en 10s cardumenes y peces ana- There are six species of pinnipeds-California sea dromos. Los dos focidos, otra vez con ciertas excep- lion, Zalophus californianus; northern sea lion, Eume- ciones, predan especies diferentes. Aparentemente, el topias jubatus; northern fur seal, Callorhinus ursinus; elefante marino se alimenta en aguas mas profundas que Guadalupe fur seal, Arctocephalus townsendi; harbor la foca peluda, alimentindose de especies demersales seal, Phoca uitulina richardsi; and northern elephant y benticas, y la foca peluda se alimenta de especiesdemer- seal, Mirounga angustirostris-that inhabit the study sales costeras y neriticas, entrando ocasionalmente en rios area of the California Cooperative Oceanic Fisheries y aguas estuarinas haciendopresa de 10s peces anadromos Investigations (CalCOFI). y otros pequeiios peces que entran regularmente en estas The numbers of animals in each population are given; aguas. the size, distribution, and seasonal movements are de- scribed. The known prey species of the pinnipeds are INTRODUCTION listed for each species. The otariids, with certain excep- The California Current, its components, and the Cali- tions, consume the same kinds of prey, although in slight- fornia Cooperative Oceanic Fisheries Investigations ly different amounts. In general they feed most commonly (CalCOFI) station plan have been described many times on the smaller schooling fishes and squids of the epi- in the past and are well known (Kramer et al.
    [Show full text]
  • Full Text in Pdf Format
    MARINE ECOLOGY PROGRESS SERIES Vol. 200: 265-275,2000 Published July 14 Mar Ecol Prog Ser Prey switching of Dall's porpoise Phocoenoides dalli with population decline of Japanese pilchard Sardinops melanostictus around Hokkaido, Japan Hiroshi Ohi~umi'~*,Toshiaki Kuramochi2,Masao ~mano',Nobuyuki Miyazakil 'Otsuchi Marine Research Center, Ocean Research Institute, The University of Tokyo, Akahama, Otsuchi, Iwate 028-1102, Japan 'Department of Zoology, National Science Museum, Hyakunincho, Shinjuku, Tokyo 160-0073, Japan ABSTRACT: The stomach contents of 150 Dall's porpoises collected during 6 surveys in the Sea of Japan and Sea of Okhotsk around Hokkaido in 1988 to 1996 were examined. A total of 49 prey types, including 29 species, were identified. Epipelagic prey items were found in samples collected during midday, and mesopelagic and some benthopelagic prey species were found in samples collected in the morning. Although the size range of prey was great, most prey were small. The dominant prey species switched in both seas from the late 1980s to the early 1990s as the Sardinops melanostictus (Japanese pilchard) populations in the both seas declined. In the Sea of Japan, the diet of Dall's por- poises switched to ~heragrachalcogramma (walleye pollock), and in the Sea of Okhotsk, their diet switched to Engraulis japonicus (Japanese anchovy) and Berryteuthis magister (magistrate armhook squid). The utilization of new prey species did not always coincide with the fluctuation in catch sta- tistics for the prey in local fisheries. Dall's porpoises fed on many benthopelagic prey species when epipelagic prey species were not available, suggesting that epipelagic prey species are the preferred prey.
    [Show full text]