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Chapter 11 the Biology and Ecology of the Oceanic Whitetip Shark, Carcharhinus Longimanus
Chapter 11 The Biology and Ecology of the Oceanic Whitetip Shark, Carcharhinus longimanus Ramón Bonfi l, Shelley Clarke and Hideki Nakano Abstract The oceanic whitetip shark (Carcharhinus longimanus) is a common circumtropical preda- tor and is taken as bycatch in many oceanic fi sheries. This summary of its life history, dis- tribution and abundance, and fi shery-related information is supplemented with unpublished data taken during Japanese tuna research operations in the Pacifi c Ocean. Oceanic whitetips are moderately slow-growing sharks that do not appear to have differential growth rates by sex, and individuals in the Atlantic and Pacifi c Oceans seem to grow at similar rates. They reach sexual maturity at approximately 170–200 cm total length (TL), or 4–7 years of age, and have a 9- to 12-month embryonic development period. Pupping and nursery areas are thought to exist in the central Pacifi c, between 0ºN and 15ºN. According to two demographic metrics, the resilience of C. longimanus to fi shery exploitation is similar to that of blue and shortfi n mako sharks. Nevertheless, reported oceanic whitetip shark catches in several major longline fi sheries represent only a small fraction of total shark catches, and studies in the Northwest Atlantic and Gulf of Mexico suggest that this species has suffered signifi cant declines in abundance. Stock assessment has been severely hampered by the lack of species-specifi c catch data in most fi sheries, but recent implementation of species-based reporting by the International Commission for the Conservation of Atlantic Tunas (ICCAT) and some of its member countries will provide better data for quantitative assessment. -
Sharks in Crisis: a Call to Action for the Mediterranean
REPORT 2019 SHARKS IN CRISIS: A CALL TO ACTION FOR THE MEDITERRANEAN WWF Sharks in the Mediterranean 2019 | 1 fp SECTION 1 ACKNOWLEDGEMENTS Written and edited by WWF Mediterranean Marine Initiative / Evan Jeffries (www.swim2birds.co.uk), based on data contained in: Bartolí, A., Polti, S., Niedermüller, S.K. & García, R. 2018. Sharks in the Mediterranean: A review of the literature on the current state of scientific knowledge, conservation measures and management policies and instruments. Design by Catherine Perry (www.swim2birds.co.uk) Front cover photo: Blue shark (Prionace glauca) © Joost van Uffelen / WWF References and sources are available online at www.wwfmmi.org Published in July 2019 by WWF – World Wide Fund For Nature Any reproduction in full or in part must mention the title and credit the WWF Mediterranean Marine Initiative as the copyright owner. © Text 2019 WWF. All rights reserved. Our thanks go to the following people for their invaluable comments and contributions to this report: Fabrizio Serena, Monica Barone, Adi Barash (M.E.C.O.), Ioannis Giovos (iSea), Pamela Mason (SharkLab Malta), Ali Hood (Sharktrust), Matthieu Lapinksi (AILERONS association), Sandrine Polti, Alex Bartoli, Raul Garcia, Alessandro Buzzi, Giulia Prato, Jose Luis Garcia Varas, Ayse Oruc, Danijel Kanski, Antigoni Foutsi, Théa Jacob, Sofiane Mahjoub, Sarah Fagnani, Heike Zidowitz, Philipp Kanstinger, Andy Cornish and Marco Costantini. Special acknowledgements go to WWF-Spain for funding this report. KEY CONTACTS Giuseppe Di Carlo Director WWF Mediterranean Marine Initiative Email: [email protected] Simone Niedermueller Mediterranean Shark expert Email: [email protected] Stefania Campogianni Communications manager WWF Mediterranean Marine Initiative Email: [email protected] WWF is one of the world’s largest and most respected independent conservation organizations, with more than 5 million supporters and a global network active in over 100 countries. -
1 a Petition to List the Oceanic Whitetip Shark
A Petition to List the Oceanic Whitetip Shark (Carcharhinus longimanus) as an Endangered, or Alternatively as a Threatened, Species Pursuant to the Endangered Species Act and for the Concurrent Designation of Critical Habitat Oceanic whitetip shark (used with permission from Andy Murch/Elasmodiver.com). Submitted to the U.S. Secretary of Commerce acting through the National Oceanic and Atmospheric Administration and the National Marine Fisheries Service September 21, 2015 By: Defenders of Wildlife1 535 16th Street, Suite 310 Denver, CO 80202 Phone: (720) 943-0471 (720) 942-0457 [email protected] [email protected] 1 Defenders of Wildlife would like to thank Courtney McVean, a law student at the University of Denver, Sturm college of Law, for her substantial research and work preparing this Petition. 1 TABLE OF CONTENTS I. INTRODUCTION ............................................................................................................................... 4 II. GOVERNING PROVISIONS OF THE ENDANGERED SPECIES ACT ............................................. 5 A. Species and Distinct Population Segments ....................................................................... 5 B. Significant Portion of the Species’ Range ......................................................................... 6 C. Listing Factors ....................................................................................................................... 7 D. 90-Day and 12-Month Findings ........................................................................................ -
© Iccat, 2007
A5 By-catch Species APPENDIX 5: BY-CATCH SPECIES A.5 By-catch species By-catch is the unintentional/incidental capture of non-target species during fishing operations. Different types of fisheries have different types and levels of by-catch, depending on the gear used, the time, area and depth fished, etc. Article IV of the Convention states: "the Commission shall be responsible for the study of the population of tuna and tuna-like fishes (the Scombriformes with the exception of Trichiuridae and Gempylidae and the genus Scomber) and such other species of fishes exploited in tuna fishing in the Convention area as are not under investigation by another international fishery organization". The following is a list of by-catch species recorded as being ever caught by any major tuna fishery in the Atlantic/Mediterranean. Note that the lists are qualitative and are not indicative of quantity or mortality. Thus, the presence of a species in the lists does not imply that it is caught in significant quantities, or that individuals that are caught necessarily die. Skates and rays Scientific names Common name Code LL GILL PS BB HARP TRAP OTHER Dasyatis centroura Roughtail stingray RDC X Dasyatis violacea Pelagic stingray PLS X X X X Manta birostris Manta ray RMB X X X Mobula hypostoma RMH X Mobula lucasana X Mobula mobular Devil ray RMM X X X X X Myliobatis aquila Common eagle ray MYL X X Pteuromylaeus bovinus Bull ray MPO X X Raja fullonica Shagreen ray RJF X Raja straeleni Spotted skate RFL X Rhinoptera spp Cownose ray X Torpedo nobiliana Torpedo -
Elasmobranch Diversity with Preliminary Description of Four Species from Territorial Waters of Bangladesh
Bangladesh J. Zool. 46(2): 185-195, 2018 ISSN: 0304-9027 (print) 2408-8455 (online) ELASMOBRANCH DIVERSITY WITH PRELIMINARY DESCRIPTION OF FOUR SPECIES FROM TERRITORIAL WATERS OF BANGLADESH A.B.M. Zafaria, Shamsunnahar, Sanjay Chakraborty, Md. Muzammel Hossain1, Md. Masud Rana and Mohammad Abdul Baki* Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh Abstract: There is a significant lack of data regarding the biodiversity of elasmobranchs in the territorial waters of Bangladesh, since that sharks and rays are not targeted by commercial fishing industry, but rather encountered as a by- catch. This paper updated the diversity of elasmobranchs in the territorial waters of Bangladesh. The study was carried out to identify two coastal areas of Patharghata, Barguna and Cox's Bazar between October, 2015 and September, 2016. Using fish landing station survey techniques, total 20 species of elasmobranch were encountered, including eight species of sharks and 12 species of batoids, under 14 genera, ten families. This is the most expended field based records of elasmobranch fishes of Bangladesh. Key words: Elasmobranch, assessment, diversity, shark, skate, ray INTRODUCTION Elasmobranchs have been evolving independently for at least 450 million years and, by the Carboniferous period, they seem to have developed a life- history pattern similar to that seen today. From a practical point of view the life- history pattern of elasmobranchs make this group of animals extremely susceptible to over fishing (Harold et al. 1990). The marine fisheries sector of Bangladesh plays a significant role in the county’s economic growth through provision of employment in coastal area and providing source of protein for the population but shark fisheries (sharks and rays) are artisanal fisheries in Bangladesh. -
Shark Catch Trends and Effort Reduction in the Beach Protection Program, Kwazulu-Natal, South Africa (Elasmobranch Fisheries - Oral)
NOT TO BE CITED WITHOUT PRIOR REFERENCE TO THE AUTHOR(S) Northwest Atlantic Fisheries Organization Serial No. N4746 NAFO SCR Doc. 02/124 SCIENTIFIC COUNCIL MEETING – SEPTEMBER 2002 Shark Catch Trends and Effort Reduction in the Beach Protection Program, KwaZulu-Natal, South Africa (Elasmobranch Fisheries - Oral) S.F.J. Dudley Natal Sharks Board, P. Bag 2, Umhlanga Rocks, 4320, South Africa E-mail: [email protected] Abstract Shark nets have been set off the beaches of KwaZulu-Natal, South Africa, since 1952, to minimise risk of shark attack. Reliable catch data for each of the 14 shark species commonly caught are available from 1978 only. The nets fish in fixed localities very close to shore and there is an absence of fisheries independent data for most species. There is uncertainty about factors such as localised stock depletion and philopatry. Catch rates of seven species show a significant decline, but this figure drops to four with the exclusion of the confounding effects of the annual sardine run. Of the four, two are caught in very low numbers (Java Carcharhinus amboinensis and great hammerhead Sphyrna mokarran) and it is probable that any decline in population size reflects either local depletion or additional exploitation elsewhere. The other two species (blacktip C. limbatus and scalloped hammerhead S. lewini) are caught in greater numbers. C. limbatus appears to have been subject to local depletion. Newborn S. lewini are captured by prawn trawlers and discarded, mostly dead, adding to pressure on this species. As a precautionary measure, and in the absence of clarity on the question of stock depletion, in September 1999 a process of reducing the number of nets per installation was begun, with a view to reducing catches. -
First Record of Six Shark Species in the Territorial Marine Waters of Iraq with a Review of Cartilaginous Fishes of Iraq
Mesopot. J. Mar. Sci., 2013, 28(1): 1 - 16 First record of six shark species in the territorial marine waters of Iraq with a review of cartilaginous fishes of Iraq A.H. Ali Department of Fisheries and Marine Resources, College of Agriculture, University of Basrah, Basrah, Iraq e-mail: [email protected] (Received: 2 September 2012 - Accepted: 10 January 2013) Abstract- During collection of some marine fishes from Khor Al-Ummaia at territorial Iraqi waters, north-west Arabian Gulf, six shark species were recorded for the first time in Iraq. These are: sand tiger shark Carchariaus taurus Rafinesque, 1810, hooktooth shark Chaenogaleus macrostoma (Bleeker, 1852), Arabian smooth-hound Mustelus mosis Hemprich & Ehrenberg, 1899, milk shark Rhizoprionodon acutus (Rüppell, 1837), Grey sharpnose shark R. oligolinx Springer, 1964, and zebra shark Stegostoma fasciatum (Hermann, 1783). The systematic characters for each species are given. The historical records of elasmobranchs of Iraq is reviewed and discussed. The present records bring the total number of shark species in Iraq to 17 species. Key words: Chondrichthyes, Sharks, first record, marine water, Iraq. Introduction Approximately 500 skates and rays and about 400 sharks, are known from marine, estuarine and freshwater systems of the world (Last and Stevens, 1994). The vast majority of cartilaginous fishes occur in marine habitats, with about 5% of the known species occur in freshwater environments (Compagno, 1990). Only 26 sharks belonging to eight families were found in the Arabian Gulf (Moore et al., 2012a). Many taxonomic studies were designed for the marine fishes of the Arabian Gulf, but regarding Iraqi marine waters few attempts were achieved but unfortunately most of them depended on records from other regions and were not based on actual collection of the specimens from the same area (Mohamed et al., unpubl.). -
Use of Productivity and Susceptibility Indices to Determine the Vulnerability of a Stock: with Example Applications to Six U.S
Use of productivity and susceptibility indices to determine the vulnerability of a stock: with example applications to six U.S. fisheries. Wesley S. Patrick1, Paul Spencer2, Olav Ormseth2, Jason Cope3, John Field4, Donald Kobayashi5, Todd Gedamke6, Enric Cortés7, Keith Bigelow5, William Overholtz8, Jason Link8, and Peter Lawson9. 1NOAA, National Marine Fisheries Service, Office of Sustainable Fisheries, 1315 East- West Highway, Silver Spring, MD 20910; 2 NOAA, National Marine Fisheries Service, Alaska Fisheries Science Center, 7600 Sand Point Way, Seattle, WA 98115; 3NOAA, National Marine Fisheries Service, Northwest Fisheries Science Center, 2725 Montlake Boulevard East, Seattle, WA 98112; 4NOAA, National Marine Fisheries Service, Southwest Fisheries Science Center, 110 Shaffer Road, Santa Cruz, CA 95060; 5NOAA, National Marine Fisheries Service, Pacific Islands Fisheries Science Center, 2570 Dole Street, Honolulu, HI 96822; 6NOAA, National Marine Fisheries Service, Southeast Fisheries Science Center, 75 Virginia Beach Drive, Miami, FL 33149; 7NOAA, National Marine Fisheries Service, Southeast Fisheries Science Center, 3500 Delwood Beach Road, Panama City, FL 32408; 8NOAA, National Marine Fisheries Service, Northeast Fisheries Science Center, 166 Water Street, Woods Hole, MA 02543; 9NOAA, National Marine Fisheries Service, Northwest Fisheries Science Center, 2030 South Marine Science Drive, Newport, OR 97365. CORRESPONDING AUTHOR: Wesley S. Patrick, NOAA, National Marine Fisheries Service, Office of Sustainable Fisheries, 1315 East-West -
Field Guide to Requiem Sharks (Elasmobranchiomorphi: Carcharhinidae) of the Western North Atlantic
Field guide to requiem sharks (Elasmobranchiomorphi: Carcharhinidae) of the Western North Atlantic Item Type monograph Authors Grace, Mark Publisher NOAA/National Marine Fisheries Service Download date 24/09/2021 04:22:14 Link to Item http://hdl.handle.net/1834/20307 NOAA Technical Report NMFS 153 U.S. Department A Scientific Paper of the FISHERY BULLETIN of Commerce August 2001 (revised November 2001) Field Guide to Requiem Sharks (Elasmobranchiomorphi: Carcharhinidae) of the Western North Atlantic Mark Grace NOAA Technical Report NMFS 153 A Scientific Paper of the Fishery Bulletin Field Guide to Requiem Sharks (Elasmobranchiomorphi: Carcharhinidae) of the Western North Atlantic Mark Grace August 2001 (revised November 2001) U.S. Department of Commerce Seattle, Washington Suggested reference Grace, Mark A. 2001. Field guide to requiem sharks (Elasmobranchiomorphi: Carcharhinidae) of the Western North Atlantic. U.S. Dep. Commer., NOAA Tech. Rep. NMFS 153, 32 p. Online dissemination This report is posted online in PDF format at http://spo.nwr.noaa.gov (click on Technical Reports link). Note on revision This report was revised and reprinted in November 2001 to correct several errors. Previous copies of the report, dated August 2001, should be destroyed as this revision replaces the earlier version. Purchasing additional copies Additional copies of this report are available for purchase in paper copy or microfiche from the National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161; 1-800-553-NTIS; http://www.ntis.gov. Copyright law Although the contents of the Technical Reports have not been copyrighted and may be reprinted entirely, reference to source is appreciated. -
Carcharhinus Dussumieri): Its Relation to the Length and Sex
Biomedicine and Nursing 2015:1(3) http://www.nbmedicine.org ISSN 2379-8211 Mercury Contamination of White Cheek Shark (Carcharhinus dussumieri): its Relation to the Length and Sex Somayeh Torabi Delshad1*, Seyed Abdolmajid Mousavi2, Houman Rajabi Islami1, Abdolrahim Pazira3 1 Department of Fisheries, Science and Research Branch, Islamic Azad University, P.O Box: 14155-4933, Tehran, Iran. 2 Department of animal Science, Agriculture Faculty, Varamin Branch, Islamic Azad University, Varamin, Iran. 3 Department of Fisheries, Boushehr Branch, Islamic Azad University, Boushehr, Iran. * Corresponding author: [email protected] Abstract: This study was conducted to assess the total mercury concentration in muscle, liver and fin tissues of whitecheek shark (Carcharhinus dussumieri, Carcharhinidae). Approximately 26 percent of all captured Sharks had total mercury concentrations greater than 0.2 mg/kg w.w., 48% contained amounts higher than 0.4 mg/kg w.w. and 22 % had more than 0.6 mg/kg w.w. Only 4 % of all samples had a concentration greater than 0.8 mg/kg w.w. In spite of significant differences in the length distributions of male and female, there were no significant differences in total mercury concentrations of experimental tissues between the genders. In all stations, muscle tissue showed the highest mercury levels (0.73 mg/kg w.w in males and 0.77 mg/kg w.w in famels), followed by Liver (0.28 mg/kg w.w. in males and 0.29 mg/kg w.w. in females) and Fins (0.13 mg/kg and 0.16 mg/kg w.w., respectively). No significant correlation was found between the concentration of mercury in tissues with sex and location, although length had an increasing effect on mercury concentration. -
Sharks in the Seas Around Us: How the Sea Around Us Project Is Working to Shape Our Collective Understanding of Global Shark Fisheries
Sharks in the seas around us: How the Sea Around Us Project is working to shape our collective understanding of global shark fisheries Leah Biery1*, Maria Lourdes D. Palomares1, Lyne Morissette2, William Cheung1, Reg Watson1, Sarah Harper1, Jennifer Jacquet1, Dirk Zeller1, Daniel Pauly1 1Sea Around Us Project, Fisheries Centre, University of British Columbia, 2202 Main Mall, Vancouver, BC, V6T 1Z4, Canada 2UNESCO Chair in Integrated Analysis of Marine Systems. Université du Québec à Rimouski, Institut des sciences de la mer; 310, Allée des Ursulines, C.P. 3300, Rimouski, QC, G5L 3A1, Canada Report prepared for The Pew Charitable Trusts by the Sea Around Us project December 9, 2011 *Corresponding author: [email protected] Sharks in the seas around us Table of Contents FOREWORD........................................................................................................................................ 3 EXECUTIVE SUMMARY ................................................................................................................. 5 INTRODUCTION ............................................................................................................................... 7 SHARK BIODIVERSITY IS THREATENED ............................................................................. 10 SHARK-RELATED LEGISLATION ............................................................................................. 13 SHARK FIN TO BODY WEIGHT RATIOS ................................................................................ 14 -
Notes on the Reproduction of the Oceanic Whitetip Shark, Carcharhinus Longimanus, in the Southwestern Equatorial Atlantic Ocean
SCRS/2008/155 Collect. Vol. Sci. Pap. ICCAT, 64(5): 1734-1740 (2009) NOTES ON THE REPRODUCTION OF THE OCEANIC WHITETIP SHARK, CARCHARHINUS LONGIMANUS, IN THE SOUTHWESTERN EQUATORIAL ATLANTIC OCEAN Rui Coelho 1,2, Fábio H.V. Hazin2, Mariana Rego2, Mirna Tambourgi2, Paulo Oliveira2, Paulo Travassos2, Felipe Carvalho1,2 and George Burgess1 SUMMARY A total of 104 oceanic whitetip sharks, 57 males and 47 females, were caught in the southwestern equatorial region and examined for their reproductive biology. Total length (TL) ranged from 72 to 253cm in males and from 74 to 252cm in females. These preliminary data suggest that size at first maturity is occurring from 160 to 196cm in males and from 181 to 203cm in females. A high proportion of the catch was composed by immature specimens, specifically 80.7% of males and 89.4% of females, suggesting a spatial size-segregation of this population. Three pregnant females were caught, with litters varying from 1 to 14 embryos. Even though at this stage there are not enough data to propose a reproductive cycle for this population, we forward the hypothesis that mating may be occurring early in the year, around March, and parturition might be occurring 10 to 12 months later, around January. As more data become available in this on-going study, we expect to define more clearly the size at maturity and the reproductive cycle of the oceanic whitetip shark for the southwestern equatorial region of the Atlantic Ocean. RÉSUMÉ Un total de 104 requins océaniques, 57 mâles et 47 femelles, ont été capturés au sud-ouest de la zone équatoriale et ont été examinés pour leur biologie reproductrice.