EJF What's the Catch
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Gill Nets and Their Operation
Gill Nets and their Operation Saly N. Thomas Central Institute of Fisheries Technology P.O. Matsyapuri, Cochin – 682 029 Email: [email protected] Gill net is a highly selective and passive gear accounting for 20% of all the fishing methods of the world. The simplicity of its design, construction, operation and its low energy requirement make the gear very popular in all the sectors especially in the traditional sector. It is a highly selective gear and the use of this gear in a responsible way ensures resource conservation. The gear is a vertical wall of netting, which is kept erect in water by means of floats and sinkers. The gear is mostly rectangular in shape whose upper end is mounted to a float line (head rope) and the lower end to a sinker line (foot rope). The nets are operated in the surface, column or bottom layers of the water column in inland, coastal and deep sea. Gill nets are operated for the capture of different groups of fishes such as sardine, mackerel, prawn, hilsa, and larger varieties like tuna, shark, seer fish, and other large pelagics. When operated for such larger varieties in the deeper areas of the sea the nets extend to several kilometers. Mechanism of fish capture in gill nets The fact that separates gill nets from all other type of fishing is that in gill nets the `mesh’ of the net serves the dual function of `selecting’ the fish to be caught and catching it. The capture of fish in gill nets depends on the net construction, its dimensions, and the shape of the fish body. -
Ghost Net Impacts on Coral Reefs Time to Complete Lesson: 20-30 Minutes
Ghost (net) Busters Ghost Net Impacts on Coral Reefs Time to complete lesson: 20-30 minutes Purpose of module: This module allows students to simulate the impacts of ghost nets on a coral reef. Students will build a model healthy reef ecosystem, damage it using a ghost net, and then remove it from the reef. Students will conduct a damage assessment caused by the net dragging across the reef using quadrats. Background information: Coral reefs, also known as the rainforests of the sea, are one of the most diverse and ecologically complex marine ecosystems. They are found in warm, tropical waters with high salinity and high light exposure. A coral reef is made up of individual coral polyps that resemble tiny anemones and are attached to the reef. Each coral polyp is less than half an inch in diameter, but they live in colonies which Figure 1: A healthy coral reef system. can expand and take up the size of a small car. Reef building corals have a skeleton made of calcium carbonate, a mineral that is left behind when an individual coral dies. Another coral may settle on that spot and grow on top of the remaining skeleton. This allows a coral reef to grow a few centimeters each year, eventually reaching massive sizes. Coral reefs provide food and shelter for many plants, invertebrates, and fish. It is estimated that at least 25% of all marine life spendCredit: part MostBeautifulThings.net of their life at a coral reef. Coral reefs provide shelter for small fish, and small fish attract larger fish, which in turn attract large predators like sharks. -
Can Fishing Gear Protect Non-Target Fish? Design and Evaluation of Bycatch Reduction Technology for Commercial Fisheries
Can fishing gear protect non-target fish? Design and evaluation of bycatch reduction technology for commercial fisheries by Brett Favaro B.Sc., Simon Fraser University, 2008 Thesis Submitted In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the Department of Biological Sciences Faculty of Science Brett Favaro 2013 SIMON FRASER UNIVERSITY Summer 2013 1 Approval Name: Brett Favaro Degree: Doctor of Philosophy Title of Thesis: Can fishing gear protect non-target fish? Design and evaluation of bycatch reduction technology for commercial fisheries Examining Committee: Chair: Dr. Lance F.W. Lesack Professor Dr. Isabelle M. Côté Senior Supervisor, Professor Dr. Stefanie D. Duff Supervisor, Professor, Department of Fisheries and Aquaculture, Vancouver Island University Dr. John D. Reynolds Supervisor, Professor Dr. Lawrence M. Dill Internal Examiner, Professor Emeritus Dr. Selina Heppell External Examiner, Associate Professor, Department of Fisheries and Wildlife, Oregon State University Date Defended/Approved: May 9, 2013 ii Partial Copyright Licence iii Ethics Statement The author, whose name appears on the title page of this work, has obtained, for the research described in this work, either: a. human research ethics approval from the Simon Fraser University Office of Research Ethics, or b. advance approval of the animal care protocol from the University Animal Care Committee of Simon Fraser University; or has conducted the research c. as a co-investigator, collaborator or research assistant in a research project approved in advance, or d. as a member of a course approved in advance for minimal risk human research, by the Office of Research Ethics. A copy of the approval letter has been filed at the Theses Office of the University Library at the time of submission of this thesis or project. -
Assessment of Queensland East Coast Otter Trawl Fishery (PDF
Assessment of the East Coast Otter Trawl Fishery November 2013 © Copyright Commonwealth of Australia, 2013. Assessment of the Queensland East Coast Otter Trawl Fishery November 2013 is licensed by the Commonwealth of Australia for use under a Creative Commons By Attribution 3.0 Australia licence with the exception of the Coat of Arms of the Commonwealth of Australia, the logo of the agency responsible for publishing the report, content supplied by third parties, and any images depicting people. For licence conditions see: http://creativecommons.org/licenses/by/3.0/au/. This report should be attributed as ‘Assessment of the Queensland East Coast Otter Trawl Fishery November 2013, Commonwealth of Australia 2013’. Disclaimer This document is an assessment carried out by the Department of the Environment of a commercial fishery against the Australian Government Guidelines for the Ecologically Sustainable Management of Fisheries – 2nd Edition. It forms part of the advice provided to the Minister for the Environment on the fishery in relation to decisions under Part 13 and Part 13A of the Environment Protection and Biodiversity Conservation Act 1999. The views and opinions expressed do not necessarily reflect those of the Australian Government or the Minister for the Environment. While reasonable efforts have been made to ensure that the contents of this publication are factually correct, the Commonwealth does not accept responsibility for the accuracy or completeness of the contents, and shall not be liable for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the contents of this publication. Contents Table 1: Summary of the East Coast Otter Trawl Fishery ................................... -
Impact of “Ghost Fishing“ Via Derelict Fishing Gear
2015 NOAA Marine Debris Program Report Impact of “Ghost Fishing“ via Derelict Fishing Gear 2015 MARINE DEBRIS GHOST FISHING REPORT March 2015 National Oceanic and Atmospheric Administration National Ocean Service National Centers for Coastal Ocean Science – Center for Coastal Environmental Health and Biomolecular Research 219 Ft. Johnson Rd. Charleston, South Carolina 29412 Office of Response and Restoration NOAA Marine Debris Program 1305 East-West Hwy, SSMC4, Room 10239 Silver Spring, Maryland 20910 Cover photo courtesy of the National Oceanic and Atmospheric Administration For citation purposes, please use: NOAA Marine Debris Program. 2015 Report on the impacts of “ghost fishing” via derelict fishing gear. Silver Spring, MD. 25 pp For more information, please contact: NOAA Marine Debris Program Office of Response and Restoration National Ocean Service 1305 East West Highway Silver Spring, Maryland 20910 301-713-2989 Acknowledgements The National Oceanic and Atmospheric Administration (NOAA) Marine Debris Program would like to acknowledge Jennifer Maucher Fuquay (NOAA National Ocean Service, National Centers for Coastal Ocean Science) for conducting this research, and Courtney Arthur (NOAA National Ocean Service, Marine Debris Program) and Jason Paul Landrum (NOAA National Ocean Service, Marine Debris Program) for providing guidance and support throughout this process. Special thanks go to Ariana Sutton-Grier (NOAA National Ocean Science) and Peter Murphy (NOAA National Ocean Service, Marine Debris Program) for reviewing this paper and providing helpful comments. Special thanks also go to John Hayes (NOAA National Ocean Service, National Centers for Coastal Ocean Science) and Dianna Parker (NOAA National Ocean Science, Marine Debris Program) for a copy/edit review of this report and Leah L. -
Design a Safe Fishing Net Notes for Teachers
You need: Design a safe • Paper or card • Pencils • Colouring pens fishing net or pencils Thousands of whales and dolphins die every year because they get trapped in fishing nets. They can’t get to the surface to breathe, so they suffocate and drown. How can we design nets that can catch fish, but won’t accidentally catch whales and dolphins? Each child will need some 1 paper, a pencil and some colouring supplies. Their challenge is to design a net that will successfully catch fish, but won’t catch whales and dolphins. Encourage children to think about what they’ve learnt about whales 2 and dolphins that might help them with their designs, for example: • How do dolphins find their food? • How big are whales and dolphins? Scan or take photos of the best net designs and send them to [email protected] – we’d love to see them! Design a safe fishing net Notes for teachers Ask the children questions to encourage them to think about their designs. Their solutions might involve stopping whales and dolphins from swimming into the net in the first place, or ways to escape if they do get trapped. Some great ideas from other children have included: • Brightly coloured nets that are easily seen; • Nets that make noise to scare whales and dolphins away; • Sensors that detect if a whale or dolphin is nearby, then retract the net; • Monitored cameras so fishermen can see and release a trapped whale or dolphin; • Nets that do not close if a whale or dolphin, or the weight of a whale or dolphin, is detected. -
Seafood Watch® Standard for Fisheries
1 Seafood Watch® Standard for Fisheries Table of Contents Table of Contents ............................................................................................................................... 1 Introduction ...................................................................................................................................... 2 Seafood Watch Guiding Principles ...................................................................................................... 3 Seafood Watch Criteria and Scoring Methodology for Fisheries ........................................................... 5 Criterion 1 – Impacts on the Species Under Assessment ...................................................................... 8 Factor 1.1 Abundance .................................................................................................................... 9 Factor 1.2 Fishing Mortality ......................................................................................................... 19 Criterion 2 – Impacts on Other Capture Species ................................................................................ 22 Factor 2.1 Abundance .................................................................................................................. 26 Factor 2.2 Fishing Mortality ......................................................................................................... 27 Factor 2.3 Modifying Factor: Discards and Bait Use .................................................................... 29 Criterion -
Marine Advisory China Fishing Vessels 03-2017.Pdf
8619 Westwood Center Drive Suite 300 THE REPUBLIC OF LIBERIA Vienna, Virginia 22182, USA Tel: +1 703 790 3434 LIBERIA MARITIME AUTHORITY Fax: +1 703 790 5655 Email: [email protected] Web: www.liscr.com 16 May 2017 Marine Advisory: 03/2017 SUBJECT: Precautions when Navigating Waters in and around Ningbo-Zhoushan, China Dear Owner, Operator, Master and Designated Person Ashore: Purpose The purpose of this Advisory is to bring attention to recent collisions involving Chinese fishing and Liberian flagged vessels and provide additional information to assist Master’s in safely navigating highly congested waters off Ningbo-Zhoushan in the East China Sea. These collisions occurred mostly at night or in fog conditions where visibility was restricted and additional lookouts were not engaged. Discussion The Chinese port Port of Ningbo-Zhoushan is located in Ningbo and Zhoushan on the coast of the East China Sea, in Zhejiang province and is ranked the busiest cargo port in the world. Large fleets of fishing junks may be encountered on the coast of China. The junks may not be carrying lights. They are solidly built and serious damage could be incurred by colliding with them. Fishing vessels vary from traditional rowing or sailing craft as little as 3m long to modern trawlers 15m long and over. We recently met with China Maritime Safety Administration (MSA) to review the collision cases and explore possible measures to help prevent similar casualties and loss of life. Attached is an Advisory prepared by Ningbo MSA that provides guidance for Master’s on navigating through the East China Sea and areas where there may be high concentrations of fishing vessels. -
Addendum Iii to Amendment 4 to the Interstate Fishery Management Plan for Weakfish
Atlantic States Marine Fisheries Commission ASMFC Vision Statement: Healthy, self-sustaining populations for all Atlantic coast fish species or successful restoration well in progress by the year 2015 ADDENDUM III TO AMENDMENT 4 TO THE INTERSTATE FISHERY MANAGEMENT PLAN FOR WEAKFISH Board Approved May 8, 2007 Acknowledgements This addendum was prepared by the Commission’s Weakfish Plan Development Team. Development of the document benefited greatly from the input of the Weakfish Technical Committee and members of the Weakfish Management Board. The Weakfish Management Board approved Addendum III on May 8, 2007. 2 STATEMENT OF THE PROBLEM As a result of Shrimp Amendment 6, the Atlantic States Marine Fisheries Commission’s Weakfish Amendment 4 and the South Atlantic Fishery Management Council’s Shrimp Fishery Management Plan are inconsistent with regard to the amount and type of bycatch required of certified bycatch reduction devices (BRDs). Without modification to Weakfish Amendment 4, new BRDs certified for use in federal waters would not be certified for use in state waters. The Commission is committed to close cooperation with the Council and the Weakfish Management Board is required to ensure that state and federal fishery management programs are coordinated, consistent, and complementary (ASMFC 1995). The Commission supports the basis of the Council’s decision to modify the BRD certification requirements in Amendment 6. However, the reasoning included a statement on weakfish status based on earlier virtual population analysis that has since been proven to be flawed and the weakfish stock is currently below the biomass threshold (ASMFC Weakfish Stock Assessment Subcommittee 2006a, 2006b). While it is not clear whether the Council would have made the same decision with a declining weakfish stock, the Weakfish Management Board clarified that modification of the requirement in Weakfish Amendment 4 is the preferred option for the following reasons. -
Factors Affecting Elasmobranch Escape from Turtle Excluder Devices
Fisheries Research 224 (2020) 105456 Contents lists available at ScienceDirect Fisheries Research journal homepage: www.elsevier.com/locate/fishres Factors affecting elasmobranch escape from turtle excluder devices (TEDs) in a tropical penaeid-trawl fishery T Matthew J. Campbella,d,*, Mark L. Tonksb, Margaret Millerb, David T. Brewerc, Anthony J. Courtneya, Colin A. Simpfendorferd a Queensland Department of Agriculture and Fisheries, Agri-Science Queensland, Ecosciences Precinct, GPO Box 267, Brisbane, Queensland, 4001, Australia b Commonwealth Scientific and Industrial Research Organisation (CSIRO) Oceans and Atmosphere, QLD Biosciences Precinct, Building 80, Services Road, St Lucia, Queensland, 4067, Australia c David Brewer Consulting, 91 Raeburn Street, Manly West, Queensland, 4179, Australia d Centre for Sustainable Tropical Fisheries and Aquaculture, James Cook University, 1 James Cook Drive, Townsville, Queensland, 4811, Australia ARTICLE INFO ABSTRACT Handled by Bent Herrmann The use of turtle excluder devices (TEDs) has resulted in fewer elasmobranchs (i.e. sharks and rays) caught in fi fi ff Keywords: tropical penaeid-trawl sheries. However, very few studies in the primary literature have quanti ed the e ects Turtle excluder device of various TED design aspects affecting the escape of elasmobranchs. Data collected by observers on board TED commercial trawlers operating in Australia’s northern prawn fishery (NPF) during 2001 were re-examined to Elasmobranch quantify the effect of TEDs on catches of various elasmobranchs. During this sampling, a total of 6204 elas- Discards mobranchs were caught from 1440 net trawls. The 34 species identified, from 15 families and four taxonomic Grid orientation orders, were dominated by small carcharhinids (n = 2160, median total length = 75 cm) and dasyatids Bar space (n = 2030, median disc width = 24 cm). -
Global Lessons and Information to Assist with Monofilament Gill Net Management in Ghana
Global lessons and information to assist with monofilament gill net management in Ghana For additional information on partner activities: WorldFish: http://www.worldfishcenter.org Friends of the Nation: http://www.fonghana.org Hen Mpoano: http://www.henmpoano.org Sustainametrix: http://www.sustainametrix.com This publication is available electronically on the Coastal Resources Center’s website at http://www.crc.uri.edu For more information on the Integrated Coastal and Fisheries Governance project, contact: Coastal Resources Center, University of Rhode Island, Narragansett Bay Campus, 220 South Ferry Road, Narragansett, Rhode Island 02882, USA. Brian Crawford, Director International Programs at [email protected]; Tel: 401-874-6224; Fax: 401-874-6920. Citation: Coastal Resources Center. (2013) Global lessons and information to assist with monofilament gill net management in Ghana. USAID Integrated Coastal and Fisheries Governance Program for the Western Region of Ghana. Narragansett, RI: Coastal Resources Center, Graduate School of Oceanography, University of Rhode Island. 14 pp. Disclaimer: This publication is made possible by the generous support of the American people through the United States Agency for International Development (USAID)/Ghana. The contents of this report are the responsibility of the Integrated Coastal and Fisheries Governance (ICFG) Program and do not necessarily reflect the views of the United States Government. Associate Cooperative Agreement No. 641-A-00-09-00036-00 for “Integrated Coastal and Fisheries Governance (ICFG) Program for the Western Region of Ghana,” under the Leader with Associates Award No. EPP-A-00-04-00014-00. Cover Photo: Fishermen repairing their nets Cover Photo Credit: Coastal Resources Center – Ghana [2 Acknowledgements Background research and drafting of this information brief was completed by Pip Cohen, with editorial input from David Mills. -
RECENT USE of FISH AGGREGATING DEVICES in the EASTERN TROPICAL PACIFIC TUNA PURSE-SEINE FISHERY: 1990-1994 (Revised March 1996)
RECENT USE OF FISH AGGREGATING DEVICES IN THE EASTERN TROPICAL PACIFIC TUNA PURSE-SEINE FISHERY: 1990-1994 (Revised March 1996) (This is a revised copy of Administrative Report LJ-95-14) By Wesley A. Armstrong and Charles W. Oliver Southwest Fisheries Science Center P.O. Box 271 La Jolla, California 92038-0271 March 1996 ADMINISTRATIVE REPORT LJ-96-02 Contents Page List of Figures....................................................................................................................................ii List of Tables.................................................................................................................................... iii INTRODUCTION............................................................................................................................1 LOGS ...............................................................................................................................................2 FADS................................................................................................................................................4 FAD INVESTIGATIONS: 1990-1992 .............................................................................................6 FAD INVESTIGATIONS: 1993-1994 .............................................................................................7 DOLPHIN-SAFE QUESTIONNAIRE.............................................................................................8 SKIPPER A's FADs: Drifting FADs: Construction and Deployment..........................................................................9