Wild Oceans Horizon Winter Newsletter 2021

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NO. 164, WINTER (JAN-MAR) 2021 INSIDE THIS ISSUE OCEAN VIEW: 2021 – LOOKING AHEAD 2 I AM WILD OCEANS: WILD OCEANS Wild BOARD MEMBER JODY BRIGHT 3 2020: OUR YEAR IN REVIEW 4 2020 OCEAN HONOR ROLL 5 TURNING THE TIDE: WILD OCEANS NEWS AND ACTIVITIES 6 FLORIDA FORAGE FISH COALITION The Horizon SCIENCE CORNER 7 ADAPTING TO A CHANGING OCEAN Rethinking Fisheries Flexibility By Theresa Labriola case scenarios and potential solu- shifts on predators that depend on Pacific Program Director tions for responding to the effects this prey. Only then can we evaluate As extreme cold poured into south- of climate change. “Flexibility” con- harvest strategies to preserve biodi- ern states in February, power fail- tinues to gain attention. versity and ecological relationships. ures followed and cast a spotlight on Flexibility is often construed as the Fisheries may need to adapt their whether energy companies and reg- ability to quickly change regula- methods, gear, vessels and markets ulators are adequately preparing for tions to allow fishing activity in a to successfully target a newly-avail- climate change. This echoes a similar new place, at a new time or for a able species. concern in fisheries management. new species. The focus has been on Adaptability relies on commercial The extreme weather that scientists maximizing yield in response to un- and recreational fishing diversity. A warn will become more common predictable events and stock shifts. diverse fishing community provides has strained power plants and has But, flexibility for the sake of maxi- the infrastructure needed to seize also caused ocean changes, shifted mizing yield comes at the expense of new opportunities. Adaptability stocks and disrupted the supply of sustainability. also relies on innovation. In South- sustainable seafood. Experts agree Discovering solutions to climate ef- ern California, deep-set buoy gear we need to change our paradigm; we fects requires an understanding of was developed that not only targets must think about worst-case scenari- ecosystem structure and function swordfish with more than 80% effi- os to reduce our vulnerability. and how human actions might impact ciency, it steers clear of threatened As ocean conditions change and fish the changing ecosystem. We must and endangered species. Designing stocks shift, we must build durable ensure that new fishing activity will selective gear becomes more impor- responses that protect ecosystems not undermine ecosystem health. tant in a shifting landscape where while encouraging fisheries to adapt. Then we can ask, "Are our fisheries the ability to engage in new oppor- Then we can avoid a black swan flexible and adaptable enough to op- tunities may hinge on avoiding non- event and ensure ocean resources erate in the new paradigm?" target species. and opportunities thrive to their full- For example, as West Coast forage The push towards flexibility must not est extent. fish shift northward, new fishing op- pull attention away from the impact Fishery managers are preparing by portunities will arise for squid, sar- of human activities on the ocean. We using climate scenario planning to dine or anchovy. We must first un- can adapt our fishing practices to identify potential challenges, worst- derstand the impact of these stock new opportunities that contribute to a sustainable future. P.O. Box 272122, Tampa, FL 33688 WildOceans.org Ocean View 2021 – Looking Ahead With a challenging 2020 in the rearview In 2020, The Driftnet Modernization and were pleased when the idea of this leg- mirror and our new 5-year Strategic Plan Bycatch Reduction Act passed the U.S. islation was first mentioned. The Forage complete, it’s time to look to the coming Senate unanimously and was approved Fish Conservation Act, as introduced in year with optimism and focus. While we by the House only to be vetoed by the the 116th Congress, had good provisions experienced a couple setbacks in two of President. In 2021, we will work to again but was problematic, excluding im- our decades-long campaigns this past year, help pass this important legislation which portant forage species groups such as Wild Oceans is not about giving up. It is our will permanently (and finally) ban the use squid. In 2021, we will advocate for legis- perseverance that has allowed us to exist of drift gillnets in all U.S .waters. lation that promotes ecologically-sustain- for nearly a half a century. So, 2021 holds • Magnuson-Stevens Act Reauthorization: able management of all forage fisheries the promise of progress by doing what we The Magnuson-Stevens Fishery Conser- through science-based best practices. do best – “sticking with an issue until we vation and Management Act (MSA), the • Conserving Billfish at Home and Abroad: get a win for the fish.” In addition to our primary law governing fisheries in fed- Wild Oceans and the International Game on-going interaction with regional fishery eral ocean waters, was last amended Fish Association led the charge in the managers, we will be working on the fol- and reauthorized in 2006. In December passage of The Billfish Conservation Act, lowing federal priorities. 2020, a discussion draft was released which prohibits billfish imports and sales • Gear Restricted Areas: Despite strong that addresses many of our priorities by in the U.S., providing a limited exemp- recommendations from more than 60 incorporating climate change science in tion for traditional fisheries and markets groups and 16,000 public comments, fisheries management, adding new tools in Hawaii and nearby territories. With the in January 2020, NOAA announced that and procedures for attending to shifting U.S. billfish market restricted to these lo- it would reopen the surface longline stocks, strengthening essential fish habi- cal sales, we turned our attention to the fi shery in the Gulf of Mexico, including tat protection and conserving forage domestic and international management areas of peak spawning for the western fish. In 2021, we will continue to provide of billfish, where limits on landings are population of Atlantic bluefin tuna. In input on MSA reauthorization bills as they needed. In 2021, we will work interna- 2021 we aim to overturn this new rule by move through Congress to ensure that tionally and domestically to adopt a per- educating decision makers and working to legislation advances conservation and manent rebuilding plan for Pacific striped reinstate these proven conservation mea- responsible management of our nation’s marlin. We will focus on research efforts sures. fisheries. to better understand billfish spawning • Drift Gillnet Legislation: For more than • Forage Fish Conservation Act: As an grounds and will work to strengthen man- 3 decades, Wild Oceans has worked to organization that has spent decades agement measures to protect them. remove drift gillnets from U.S. waters. advancing forage fish conservation, we – Rob Kramer, President For the Future of Fishing Wild Oceans is a 501(c)(3) non-profit organization dedicated to keeping the oceans wild to preserve fishing opportunities for the future. Our Goals: Officers and Staff: Board of Directors: ● preventing overfishing and restoring Tim Choate, Chairman Mary Barley (Islamorada, FL) depleted fish populations to healthy Tim Ervin, Vice Chairman Bill Boyce (Saugus, CA) levels Rob Kramer, President C. J. Bright, Jr. (Kailua-Kona, HI) ● promoting sustainable use Pam Lyons Gromen, Executive Director Tim Choate (Coral Gables, FL) policies that balance commercial, recreational and ecological values Theresa Labriola, Pacific Program Director Stephanie Choate Oppenheimer (Tulsa, OK) Tim Ervin (Onekama, MI) ● modifying or eliminating wasteful fishing practices Ken Hinman (Lovettsville, VA) Contact Us: ● improving our understanding of Wild Oceans Frankie Labriola (Misquamicut Beach, RI) fish and their role in the marine P.O. Box 272122 Peter Truslow (St. Petersburg, FL) environment Tampa FL 33688 Directors Emeritus office: 727.677.8127 ● preserving fish habitat and water Stanley Arkin (New York, NY) quality web: wildoceans.org John Heyer (Sedona, AZ) 2 JODY BRIGHT WILD OCEANS BOARD MEMBER I am Wild Oceans When I told my Dad I was going to turned into a lifetime take “a year off from college” to go and, I probably would chase marlin, he was not pleased. have made more mon- I shook my head at that. I mean, it ey working on things was his fault. that required a college It’s not that I was one of those kids degree. who couldn’t wait to get away from But then I would have their parents. It was just that he’s never become a “regu- the one who raised me fishing. lar” on the Great Barri- how do I create a Hawaii Conserva- He was the guy who made me clean er Reef during the giant black marlin tion Association (HCA)?" most of the fish while letting my seasons. Nor would I have left the With HCA we passed reef fish legis- brothers off to go swim. When I GBR after each season to join a salty lation in the State Capitol when the asked why, he said, “Because I think old scalawag named Leo Wooten requisite State agency would take no you like fishing more than they do.” on Bora Bora, supplying fish to the administrative action. Armed with I shook my head at that too. legendary Bloody Mary’s restaurant. experience gained at FFA and from On The Reef I learned how to catch a gig Nichol’s got me with the Food My Dad was one in a group of bud- giant black marlin. This helped Leo dies who founded the Poco Bueno and Agriculture Organization of the and I catch the largest blue marlin of United Nations, I once approached tournament and the Gulf Coast Con- my life. From Leo I learned that stor- servation Association (GCCA). GCCA the Western Pacific Council on the ing tools in the oily bilge kept them subject of long line management.
Recommended publications
  • Striped Marlin (Kajikia Audax)

    Striped Marlin (Kajikia Audax)

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  • Black Marlin (Makaira Indica) Blue Marlin (Makaira Nigricans) Blue

    Black Marlin (Makaira Indica) Blue Marlin (Makaira Nigricans) Blue

    Black marlin (Makaira indica) Blue marlin (Makaira nigricans) Blue shark (Prionace glauca) Opah (Lampris guatus) Shorin mako shark (Isurus oxyrinchus) Striped marlin (Kaijkia audax) Western Central Pacific, North Pacific, South Pacific Pelagic longline July 12, 2016 Alexia Morgan, Consulng Researcher Disclaimer Seafood Watch® strives to have all Seafood Reports reviewed for accuracy and completeness by external sciensts with experse in ecology, fisheries science and aquaculture. Scienfic review, however, does not constute an endorsement of the Seafood Watch® program or its recommendaons on the part of the reviewing sciensts. Seafood Watch® is solely responsible for the conclusions reached in this report. Table of Contents Table of Contents 2 About Seafood Watch 3 Guiding Principles 4 Summary 5 Final Seafood Recommendations 5 Introduction 8 Assessment 10 Criterion 1: Impacts on the species under assessment 10 Criterion 2: Impacts on other species 22 Criterion 3: Management Effectiveness 45 Criterion 4: Impacts on the habitat and ecosystem 55 Acknowledgements 58 References 59 Appendix A: Extra By Catch Species 69 2 About Seafood Watch Monterey Bay Aquarium’s Seafood Watch® program evaluates the ecological sustainability of wild-caught and farmed seafood commonly found in the United States marketplace. Seafood Watch® defines sustainable seafood as originang from sources, whether wild-caught or farmed, which can maintain or increase producon in the long-term without jeopardizing the structure or funcon of affected ecosystems. Seafood Watch® makes its science-based recommendaons available to the public in the form of regional pocket guides that can be downloaded from www.seafoodwatch.org. The program’s goals are to raise awareness of important ocean conservaon issues and empower seafood consumers and businesses to make choices for healthy oceans.
  • A Black Marlin, Makaira Indica, from the Early Pleistocene of the Philippines and the Zoogeography of Istiophorid B1llfishes

    A Black Marlin, Makaira Indica, from the Early Pleistocene of the Philippines and the Zoogeography of Istiophorid B1llfishes

    BULLETIN OF MARINE SCIENCE, 33(3): 718-728,1983 A BLACK MARLIN, MAKAIRA INDICA, FROM THE EARLY PLEISTOCENE OF THE PHILIPPINES AND THE ZOOGEOGRAPHY OF ISTIOPHORID B1LLFISHES Harry L Fierstine and Bruce 1. Welton ABSTRACT A nearly complete articulated head (including pectoral and pelvic girdles and fins) was collected from an Early Pleistocene, upper bathyal, volcanic ash deposit on Tambac Island, Northwest Central Luzon, Philippines. The specimen was positively identified because of its general resemblance to other large marlins and by its rigid pectoral fin, a characteristic feature of the black marlin. This is the first fossil billfish described from Asia and the first living species of billfi sh positively identified in the fossil record. The geographic distribution of the two living species of Makaira is discussed, Except for fossil localities bordering the Mediterranean Sea, the distribution offossil post-Oligocene istiophorids roughly corresponds to the distribution of living adult forms. During June 1980, we (Fierstine and Welton, in press) collected a large fossil billfish discovered on the property of Pacific Farms, Inc., Tambac Island, near the barrio of Zaragoza, Bolinao Peninsula, Pangasinan Province, Northwest Cen­ tral Luzon, Philippines (Fig. 1). In addition, associated fossils were collected and local geological outcrops were mapped. The fieldwork continued throughout the month and all specimens were brought to the Natural History Museum of the Los Angeles County for curation, preparation, and distribution to specialists for study. The fieldwork was important because no fossil bony fish had ever been reported from the Philippines (Hashimoto, 1969), fossil billfishes have never been described from Asia (Fierstine and Applegate, 1974), a living species of billfish has never been positively identified in the fossil record (Fierstine, 1978), and no collection of marine macrofossils has ever been made under strict stratigraphic control in the Bolinao area, if not in the entire Philippines.
  • A Global Valuation of Tuna an Update February 2020 (Final)

    A Global Valuation of Tuna an Update February 2020 (Final)

    Netting Billions: a global valuation of tuna an update February 2020 (Final) ii Report Information This report has been prepared with the financial support of The Pew Charitable Trusts. The views expressed in this study are purely those of the authors. The content of this report may not be reproduced, or even part thereof, without explicit reference to the source. Citation: Macfadyen, G., Huntington, T., Defaux, V., Llewellin, P., and James, P., 2019. Netting Billions: a global valuation of tuna (an update). Report produced by Poseidon Aquatic Resources Management Ltd. Client: The Pew Charitable Trusts Version: Final Report ref: 1456-REG/R/02/A Date issued: 7 February 2020 Acknowledgements: Our thanks to the following consultants who assisted with data collection for this study: Richard Banks, Sachiko Tsuji, Charles Greenwald, Heiko Seilert, Gilles Hosch, Alicia Sanmamed, Anna Madriles, Gwendal le Fol, Tomasz Kulikowski, and Benoit Caillart. 7 February 2020 iii CONTENTS 1. BACKGROUND AND INTRODUCTION ................................................................... 1 2. STUDY METHODOLOGY ......................................................................................... 3 3. TUNA LANDINGS ..................................................................................................... 5 3.1 METHODOLOGICAL ISSUES ....................................................................................... 5 3.2 RESULTS ...............................................................................................................
  • Frequently Asked Questions

    Frequently Asked Questions

    atlaFrequentlyntic white Asked mQuestionsarlin 2007 Status Review WHAT ARE ATLANTIC WHITE MARLIN? White marlin are billfish of the Family Istiophoridae, which includes striped, blue, and black marlin; several species of spearfish; and sailfish. White marlin inhabit the tropical and temperate waters of the Atlantic Ocean and adjacent seas. They generally eat other fish (e.g., jacks, mackerels, mahi-mahi), but will feed on squid and other prey items. White marlin grow quickly and can reach an age of at least 18 years, based on tag recapture data (SCRS, 2004). Adult white marlin can grow to over 9 feet (2.8 meters) and can weigh up to 184 lb (82 kg). WHY ARE ATLANTIC WHITE MARLIN IMPORTANT? Atlantic white marlin are apex predators that feed at the top of the food chain. Recreational fishers seek Atlantic blue marlin, white marlin, and sailfish as highly-prized species in the United States, Venezuela, Bahamas, Brazil, and many countries in the Caribbean Sea and west coast of Africa. White marlin, along with other billfish and tunas, are managed internationally by member nations of the International Commission for the Conservation of Atlantic Tunas (ICCAT). In the United States, Atlantic blue marlin, white marlin, and Atlantic sailfish can be landed only by recreational fishermen fishing from either private vessels or charterboats. WHAT IS A STATUS REVIEW? A status review is the process of evaluating the best available scientific and commercial information on the biological status of a species and the threats it is facing to support a decision whether or not to list a species under the ESA or to change its listing.
  • POST-RELEASE MORTALITY of SCHOOL-SIZE ATLANTIC BLUEFIN TUNA (Thunnus Thynnus) in the U.S

    POST-RELEASE MORTALITY of SCHOOL-SIZE ATLANTIC BLUEFIN TUNA (Thunnus Thynnus) in the U.S

    W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 2013 Post-Release Mortality of School-Size Atlantic Bluefin unaT (Thunnus thynnus) in the U.S Recreational Troll Fishery Benjamin Jon Marcek College of William and Mary - Virginia Institute of Marine Science Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Fresh Water Studies Commons, and the Oceanography Commons Recommended Citation Marcek, Benjamin Jon, "Post-Release Mortality of School-Size Atlantic Bluefin unaT (Thunnus thynnus) in the U.S Recreational Troll Fishery" (2013). Dissertations, Theses, and Masters Projects. Paper 1539617936. https://dx.doi.org/doi:10.25773/v5-fknv-f695 This Thesis is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. POST-RELEASE MORTALITY OF SCHOOL-SIZE ATLANTIC BLUEFIN TUNA (Thunnus thynnus) IN THE U.S. RECREATIONAL TROLL FISHERY A Thesis Presented to The Faculty of the School of Marine Science The College of William and Mary In Partial Fulfillment Of the Requirements for the Degree of Master of Science by Benjamin Jon Marcek 2013 APPROVAL SHEET This thesis is submitted in partial fulfillment of the requirements for the degree of Master of Science Benjamin'Jon Marcek Approved, by the Committee, August 2013 ihn E. Graves, Ph.D. Committee Chairman/Advisor f Mary . Fabrizio, pfct). Richard W. Brill, Ph.D. John M. Brubaker, Ph.D.
  • Indo-Pacific Population Structure of the Black Marlin, Makaira Indica, Inferred from Molecular Markers

    Indo-Pacific Population Structure of the Black Marlin, Makaira Indica, Inferred from Molecular Markers

    W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 1999 Indo-Pacific opulationP Structure of the Black Marlin, Makaira indica, Inferred from Molecular Markers Brett Falterman College of William and Mary - Virginia Institute of Marine Science Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Marine Biology Commons, Molecular Biology Commons, Oceanography Commons, and the Zoology Commons Recommended Citation Falterman, Brett, "Indo-Pacific opulationP Structure of the Black Marlin, Makaira indica, Inferred from Molecular Markers" (1999). Dissertations, Theses, and Masters Projects. Paper 1539617749. https://dx.doi.org/doi:10.25773/v5-24r7-ht42 This Thesis is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. Indo-Pacific Population Structure of the Black Marlin, Makaira indica, Inferred from Molecular Markers A Thesis Presented to The Faculty of the School of Marine Science, College of William and Mary In Partial Fulfillment of the Requirements for the degree of Master of Science by Brett Falterman APPROVAL SHEET This thesis is submitted in partial fulfillment of the requirements of the degree of Master of Science Brett Falterman Approved December, 1999 Jdmirp. Graves, Ph.D. Committee Chairman, Advisor Kimberly Reece, Ph.D. Musics; Ph.D m Brubaker, Ph.D. Jm im repperell, Ph.D. PepperelT Research and Consulting Caringbah, NSW, Australia TABLE OF CONTENTS Page Acknowledgments .................................................................................................................... i v List of Tables ............................................................................................................................
  • And Black Marlin (Istiompax Indica) in the Eastern Pacific Ceo an Nima Farchadi University of San Diego

    And Black Marlin (Istiompax Indica) in the Eastern Pacific Ceo an Nima Farchadi University of San Diego

    University of San Diego Digital USD Theses Theses and Dissertations Fall 9-26-2018 Habitat Preferences of Blue Marlin (Makaira nigricans) and Black Marlin (Istiompax indica) in the Eastern Pacific ceO an Nima Farchadi University of San Diego Michael G. Hinton Inter-American Tropical Tuna Commission Andrew R. Thompson Southwest Fisheries Science Center Zhi-Yong Yin University of San Diego Follow this and additional works at: https://digital.sandiego.edu/theses Part of the Applied Statistics Commons, Oceanography Commons, Population Biology Commons, Statistical Models Commons, and the Terrestrial and Aquatic Ecology Commons Digital USD Citation Farchadi, Nima; Hinton, Michael G.; Thompson, Andrew R.; and Yin, Zhi-Yong, "Habitat Preferences of Blue Marlin (Makaira nigricans) and Black Marlin (Istiompax indica) in the Eastern Pacific cO ean" (2018). Theses. 32. https://digital.sandiego.edu/theses/32 This Thesis is brought to you for free and open access by the Theses and Dissertations at Digital USD. It has been accepted for inclusion in Theses by an authorized administrator of Digital USD. For more information, please contact [email protected]. UNIVERSITY OF SAN DIEGO San Diego Habitat Preferences of Blue Marlin (Makaira nigricans) and Black Marlin (Istiompax indica) in the Eastern Pacific Ocean A thesis submitted in partial satisfaction of the requirements for the degree of Master of Science in Marine Science by Nima Jason Farchadi Thesis Committee Michael G. Hinton, Ph.D., Chair Andrew R. Thompson, Ph.D. Zhi-Yong Yin, Ph.D. 2018 The thesis of Nima Jason Farchadi is approved by: ___________________________________ Michael G. Hinton, Ph.D., Chair Inter-American Tropical Tuna Commission ___________________________________ Andrew R.
  • A Possible Hatchet Marlin (Tetrapturus Sp.) from the Gulf of Mexico Paul J

    A Possible Hatchet Marlin (Tetrapturus Sp.) from the Gulf of Mexico Paul J

    Northeast Gulf Science Volume 4 Article 7 Number 1 Number 1 9-1980 A Possible Hatchet Marlin (Tetrapturus sp.) from the Gulf of Mexico Paul J. Pristas National Marine Fisheries Service DOI: 10.18785/negs.0401.07 Follow this and additional works at: https://aquila.usm.edu/goms Recommended Citation Pristas, P. J. 1980. A Possible Hatchet Marlin (Tetrapturus sp.) from the Gulf of Mexico. Northeast Gulf Science 4 (1). Retrieved from https://aquila.usm.edu/goms/vol4/iss1/7 This Article is brought to you for free and open access by The Aquila Digital Community. It has been accepted for inclusion in Gulf of Mexico Science by an authorized editor of The Aquila Digital Community. For more information, please contact [email protected]. Pristas: A Possible Hatchet Marlin (Tetrapturus sp.) from the Gulf of Mexi Short papers and notes 51 A POSSIBLE HATCHET MARLIN Tetrapturus that has some characteristics (Tetrapturus sp.) FROM THE GULF of a hatchet marlin. It was recognized OF MEXIC01 while collecting catch/effort and bio­ logical data from the recreational fishery At least eight species of billfishes (lsti­ for billfishes in the northern Gulf of ophoridae and Xiphiidae) have been re­ Mexico. ported from the Atlantic Ocean including the Mediterranean Sea. The following DESCRIPTION species have been identified in both sport and commercial landings: swordfish, The fish was caught on August 21, 1978, Xiphias g/adius Linnaeus; sailfish, lsti­ approximately 111 km east northeast of ophorous playtypterus (Shaw and Port Mansfield, Texas, and was initially Nodder2); blue marlin, Makaira nigricans identified as T. albidus.
  • 8.2 the Significance of Ocean Deoxygenation for Open Ocean Tunas and Billfishes Shirley Leung,K

    8.2 the Significance of Ocean Deoxygenation for Open Ocean Tunas and Billfishes Shirley Leung,K

    8.2 The significance of ocean deoxygenation for open ocean tunas and billfishes Shirley Leung,K. A. S. Mislan, Barbara Muhling and Richard Brill 8.2 The significance of ocean deoxygenation for open ocean tunas and billfishes Shirley Leung1,*, K. A. S. Mislan1,2, Barbara Muhling3,4 and Richard Brill5 1 School of Oceanography, University of Washington, USA. Email : [email protected] 2 eScience Institute, University of Washington, USA 3 University of California Santa Cruz, Santa Cruz, CA, USA 4 National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Science Center, La Jolla, CA, USA 5 Virginia Institute of Marine Science, Gloucester Point, VA, USA Summary • Tunas and billfishes should be especially sensitive to low ambient oxygen conditions given their high metabolic rates as well as the large differences between their resting and maximum metabolic rates. Although there are many behavioural similarities among the different species, there are also clear and demonstrable differences in growth rates, maximum adult size, physiological abilities, low-oxygen tolerances, and preferred environmental conditions. • Climate change is projected to alter oxygen concentrations throughout the open ocean, with most regions undergoing decreases due to a slowdown in ocean ventilation and a decline in surface oxygen solubility. Between 200 and 700 m depth (a vertical range including depths to which tunas and billfishes commonly descend to forage), the greatest and most certain decreases in oxygen concentrations are projected to occur in the North Pacific and much of the Southern Ocean, while the smallest and least certain changes are projected to occur within the tropical Pacific Ocean.
  • Fishing Ground, Cacth Composition, Hook Rate and Length Distribution of Billfishes Caught by Tuna Long Line in Indian Ocean

    Fishing Ground, Cacth Composition, Hook Rate and Length Distribution of Billfishes Caught by Tuna Long Line in Indian Ocean

    Fishing Ground, Cacth Composition, Hook Rate...……by Tuna Longline in Indian Ocean (Rocman, F., et al) FISHING GROUND, CACTH COMPOSITION, HOOK RATE AND LENGTH DISTRIBUTION OF BILLFISHES CAUGHT BY TUNA LONG LINE IN INDIAN OCEAN Fathur Rochman, Abram Barata and Budi Nugraha Research Institute for Tuna fisheries Received February 11-2013; Received in revised form October 17-2013; Accepted December 10-2013 ABSTRACT Billfishes area by cacth of tuna long line vessels in Indian Ocean. Billfish are consist of swordfish Xiphiasgladius, black marlin Makairaindica, indo facific blue marlin Makairamazara, stripe marlin Tetrapturusaudax, indo facific sailfish Istiophorus platypterusand shortbill spearfish Tetrapturusangustirostris. Besides that, billfishes also have important economic value compared with tuna as an exsported species such as swordfish and marlin. To optimize the catch of billfishes in Indian Ocean, data and information of potential fishing ground, size and catch composition of this species are needed. The billfishes cacth composition collected in 2011 were dominated by 45% swordfish, 20% black marlin, 19% blue marlin,9% short bill spearfish, 6% sailfish and 1%stripe marlin. The billfishes size range which were caught between 60 - 280 cm LJFL (Lower Jaw Fork Length). The sword fish average length was 150 cm, blue marlin 197 cm, black Marlin 189 cm, sailfish 150cm ,short bill spearfish 144 cm and stripe marlin159 cm. From this observation, it was found that most of billfishes caught were in mature. KEYWORDS: Billfishes, Fishing Ground, Indian Ocean, Long line and By Cacth INTRODUCTION MATERIALS AND METHODS The term —BillFishes“ has been widely accepted The data analyzed from direct observation onboard by both commercial and sport fisherman as well as of tuna long line vessel fishing in Indian Ocean, scientist, to apply to the large fishes of the xiphiidae conducted from March 2010 to December 2011.
  • An Analysis of Billfish Landings in the Pelagic Fisheries in Sri Lanka R

    An Analysis of Billfish Landings in the Pelagic Fisheries in Sri Lanka R

    AN ANALYSIS OF BILLFISH LANDINGS IN THE PELAGIC FISHERIES IN SRI LANKA R. Maldeniya, P. Dayaratne, and P.D.K.D. Amarasooriya National Aquatic Resources Agency Crow Island, Colombo 15 Sri Lanka As there are many types of vessel and gear combinations INTRODUCTION contributing to the billfish landings in the island, analyses were made separately for different combinations. With the expansion of the fishing range of the large pelagic fishing fleet in early 1980s (Dayaratne, 1993), a substantial increase of billfish catches, from around 4,000 RESULTS t in 1984 to 11,000 t in 1993, was realised, highlighting their importance in the offshore fisheries in Sri Lanka. Fishing gear and effort The present production level makes up about 7% of the total large pelagics landed in the island and around 32% Billfish is not the target group in any of the local of the total billfish landed in the Indian Ocean commercial fisheries directed toward large pelagics. They (Anon,1995). form an important incidental catch in gillnets, longlines and troll lines. Vessels operating these gears are primarily Studies of billfish and their fisheries around Sri Lanka are engaged in catching tunas. Traditional vessels, 6-7 m limited and mainly based on the landings made from the boats with outboard motors and 9-m boats, operate one- coastal waters, prior to the development of offshore day fishing in coastal waters, <30 km from the shore, fisheries. Jinadasa (1985) reported on the species while >10-11 m boats and those over 10 m generally composition, size range and abundance of sailfish and operate multi-day fishing in the offshore and deep-sea marlin caught in the waters off Negombo, on the west area.