DOCSLIB.ORG

Channa Bleheri) in Assam

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Channa Bleheri) in Assam J. Exp. Zool. India Vol. 14, Supplement 1, pp. 27-32, 2011 ISSN 0972-0030 HISTOLOGICAL STUDY OF GONADS DURING BREEDING SEASON OF A THREATENED FISH RAINBOW SNAKEHEAD (CHANNA BLEHERI) IN ASSAM Samarendra Behera*, Rinku Gogoi and Sanjeev Kumar Department of Fisheries Resource Management, Faculty of Fishery Sciences, West Bengal University of Animal and Fishery Sciences, 5, Budherhat Road, Chakgaria, P.O. Panchasayar, Kolkata – 700 094, India. *e-mail: [email protected] (Accepted 18 January 2011) ABSTRACT : The study was confined to the laboratory investigation during September 2010 to August 2011 for the study of gonad histologically during breeding of threatened fish rainbow snakehead (Channa bleheri) collected from natural environment in Assam. It was found that the genital material (milt and ova) their structure, number are regulated according to the influence of seasonal cycle and hormonal secretion. A single breeding season of Channa bleheri was found that is during May and June. Key words : Channa bleheri, gonad, histology and breeding seasons. INTRODUCTION bleheri is considered as on threatened species, which As far as the export of ornamental fishes from India needs conservation through propagation. Propagation of is concerned, 90% of the total exports are wild caught fish is made by two ways as (i) Natural propagation and fishes of fresh water origin and arising from North-Eastern (ii) Artificial propagation. In natural propagation: fish region. The remaining 10% are either tank reared or breed enhances its population in the nature, which is already and reared varieties of exotic species of fresh water or destroyed and under risk now because of high exploitation marine origin. The important fresh water ornamental fish of this species from the natural resources for aquarium collection centers in India are located in the North Eastern fish trade. In artificial propagation: the species is supplied states. About 80% of ornamental fishes from India to with a simulated environment and allowed for breeding International market are exported via Kolkata Airport, of and rearing of spring in the laboratory condition. which the lion’s share (more than 80%) is contributed MATERIALS AND METHODS from North Eastern Region. A study on histological study of gonads during North-eastern India is rich in swamps and lakes, and breeding season of a threatened fish rainbow snakehead in Channid fauna. Under the All India Co-ordinated Project (Channa bleheri) in Assam was conducted in the on air-breathing fishes Dehadrai (1975) made extensive Department of Fishery Resources Management, Faculty studies on the cage culture of some of the species of this of Fishery Sciences, West Bengal, for one year. region. However, taxonomy and phylogeny of the Channid Histological study fishes of the region is poorly understood. For histological study, the microscopic slides were Channa bleheri shows heigh density of occurance prepared by the following procedure as followed by of but restricted only to the upper Assam zone of the Agarwal (1996). The development stages of germ cells Brahmaputra, Dibru river basin (mainly Tinsukia and in the testes and the change of the oocytes in ovary were Dibrugarh districts of Assam) and can be considered rare. studied by following methods. This species encountered in the open water during flood Collection and fixation of tissue : For histological when they come out of their holes, but during winter the study, the middle parts of the gonadal tissues (testes and fish can be caught by digging the hole in the specific areas ovary) of Channa bleheri were collected as stated earlier. (Goswami et al, 2006). The tissues were trimmed into 5 to 6 mm size for better Channa bleheri species is caught from the natural penetration of fixatives into it. The tissues were put into resources for the aquarium fish trade (Ralf Britz, personal Formaldehyde Saline (Baker, 1944) (Appendix-I) for 24 commun., 2002). By which the population of this species to 48 hours as per size of tissues. is decreasing in a great extent and reached to a state of endemic and rare (Musikasinthern, 2000). Channa 28 Samarendra Behera et al Post fixation treatment tap water. After cleaning, the slides were air-dried and a Washing : The tissues (testes and ovary) were thin layer of Glycerin Egg Albumin (Appendix-IV) was removed from the fixatives and subjected to overnight rinsed over it. Then the ribbons with materials (about 10 washing with flowing clear tap water until the to 15 sections depending on the size) were spread over formaldehyde odour was vanished. the clean glass slides. Thin tissues were made wrinkle free and allowed to fix on slides by keeping them on hot Dehydration : The tissues were dehydrated perfectly plates (30°C) for 2 to 5 minutes. with graded alcohols, starting from 30%, 50%, 70%, 90% and absolute alcohol (100%) to avoid the brittleness of De-waxing and staining : Tissues fixed on slides the tissues. were de-waxed with descending order of alcohols (100%, 90%, 70%, 50% and 30%) and stained by the double De-alcoholization : Two changes of xylene (1 hr staining method with Haematoxylin and Eosin by using each) were made to clean the tissues from alcohol. For standard techniques as described by Agarwal (1996). better impregnation of wax into the tissue, the xylene penetrates into the tissue to become transparent and the Mounting : One or two drops of DPX (mountant) material comes up to float on the top. were put on the dried slide which one was ready for mounting. Then, a cover slip or slide was slowly lowered Infiltration : Paraffin wax (melting point 58-60°C when the mountant would flow ahead of the descending of B.D.H) was used for infiltration of tissue. Three glass without trapping air bubble between the cover slip changes of wax (45 min each) were made to make tissue and slide. The excess of mountant on the slides was xylene free. removed with xylene soaked cotton. After mounting, the Embedding : For the preparation of blocks, pure slides were allowed for drying. The excess of mountant paraffin wax was melted in water bath in between 58- on the slides was removed with xylene soaked cotton. 60°C. Metal ‘L’ moulds were adjusted according to the Labeling and storing : Labeling was done on the size of blocking materials. The melted paraffin was taken slide by glass marking pen to avoid future confusion. The from water bath and the blocking disc was filled. After slides were stored in slide box to protect them from dust permitting a layer of wax to be solidifying on the bottom and dirt. disc, the completely infiltrated tissues were carefully taken from the paraffin wax and put inside the different blocking Microscopic observation : The histological sections disc according to their size. Care was taken so that the on the prepared slides were thoroughly observed under wax on the top of the disc did not solidify during keeping Advanced Trinocular Microscope (Olympus, MODEL 8 the material in the blocking disc. For this reason, a heated x 51, Japan) microscope at different magnifications. The needle or forceps was put only the upper portion or inside developmental stages of germ cells in the testes and the wax of the disc. After the proper positioning of the changes of the oocytes of ovary were noticed carefully. tissues, the wax inside the disc was allowed to solidify. Colour photomicrographs of selected histological sections After few minutes, the ‘L’ moulds were removed from were taken as and when required. the wax block. Thus prepared blocks were kept separately RESULTS AND DISCUSSION inside the labeled polythene packets. Histological Observation Trimming and sectioning : The paraffin blocks Testicular cyclicity : Histological micro slides are 2 were trimmed carefully to 6 to 7 mm by sharp blades. observed for six months and found different levels of The trimmed blocks were fixed to the wooden holder (peg) testicular matters in it. On the basis of the testicular with the material facing away from it. Molten wax was matters the maturation stages of testes are also determined poured on the holder and the block was kept on it. The (Table 1). block was padded with more wax at the base to make it Histological structure of testes is variable from strong. After being confirm, the blocks were firmly fixed species to species. According to Gaurya et al (1997), with holder, the sectioning was done by using microtome when reproductive activity (spermatogenesis) is (SPENCER 820 TYPE). On the microtome, each section undergoing in the lobules of testes of fish, about six was cut into 5µ thickness. The ribbons containing tissues spermatogenic elements are produced from sperm mother were collected on clear glass slide (already a smear of cells of germinal epithelium and passes through different egg-albumin was kept on that slide) with the help of fine maturation stages as primary spermatogonia, secondary brush. spermatogonia, primary spermatocytes, secondary Spreading and fixing : Glass slides were cleaned spermatocytes, spermatids and spermatozoa (sperms). properly by Chromic-acid solution, soap and finally with Histological study of gonads during breeding season 29 Plate 1 : Photomicrograph of T.S. of Testis of Channa bleheri, Stage Plate 2 : Photomicrograph of T.S. of Testis of Channa bleheri, Stage III developing phase during March (10×0.25). IV pr-spawning phase during April (10×0.25). Plate 3 : Photomicrograph of T.S. of Testis of Channa bleheri, Stage Plate 4 : Photomicrograph of T.S. of Testis of Channa bleheri, Stage V spawning phase during May-June (10×0.25). VI spent phase during July (10×0.25). Plate 5 : Photomicrograph of T.S. of Testis of Channa bleheri, Stage I resting phase during August (10×0.25). The spermatozoa contains nucleus, cytoplasmic only during June, which is considered as breeding season.
Load more

Recommended publications
  • Snakeheadsnepal Pakistan − (Pisces,India Channidae) PACIFIC OCEAN a Biologicalmyanmar Synopsis Vietnam
    Mongolia North Korea Afghan- China South Japan istan Korea Iran SnakeheadsNepal Pakistan − (Pisces,India Channidae) PACIFIC OCEAN A BiologicalMyanmar Synopsis Vietnam and Risk Assessment Philippines Thailand Malaysia INDIAN OCEAN Indonesia Indonesia U.S. Department of the Interior U.S. Geological Survey Circular 1251 SNAKEHEADS (Pisces, Channidae)— A Biological Synopsis and Risk Assessment By Walter R. Courtenay, Jr., and James D. Williams U.S. Geological Survey Circular 1251 U.S. DEPARTMENT OF THE INTERIOR GALE A. NORTON, Secretary U.S. GEOLOGICAL SURVEY CHARLES G. GROAT, Director Use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Copyrighted material reprinted with permission. 2004 For additional information write to: Walter R. Courtenay, Jr. Florida Integrated Science Center U.S. Geological Survey 7920 N.W. 71st Street Gainesville, Florida 32653 For additional copies please contact: U.S. Geological Survey Branch of Information Services Box 25286 Denver, Colorado 80225-0286 Telephone: 1-888-ASK-USGS World Wide Web: http://www.usgs.gov Library of Congress Cataloging-in-Publication Data Walter R. Courtenay, Jr., and James D. Williams Snakeheads (Pisces, Channidae)—A Biological Synopsis and Risk Assessment / by Walter R. Courtenay, Jr., and James D. Williams p. cm. — (U.S. Geological Survey circular ; 1251) Includes bibliographical references. ISBN.0-607-93720 (alk. paper) 1. Snakeheads — Pisces, Channidae— Invasive Species 2. Biological Synopsis and Risk Assessment. Title. II. Series. QL653.N8D64 2004 597.8’09768’89—dc22 CONTENTS Abstract . 1 Introduction . 2 Literature Review and Background Information . 4 Taxonomy and Synonymy .
    [Show full text]
  • Eu Non-Native Organism Risk Assessment Scheme
    EU NON-NATIVE SPECIES RISK ANALYSIS – RISK ASSESSMENT Channa spp. EU NON-NATIVE ORGANISM RISK ASSESSMENT SCHEME Name of organism: Channa spp. Author: Deputy Direction of Nature (Spanish Ministry of Agriculture and Fisheries, Food and Environment) Risk Assessment Area: Europe Draft version: December 2016 Peer reviewed by: David Almeida. GRECO, Institute of Aquatic Ecology, University of Girona, 17003 Girona, Spain ([email protected]) Date of finalisation: 23/01/2017 Peer reviewed by: Quim Pou Rovira. Coordinador tècnic del LIFE Potamo Fauna. Plaça dels estudis, 2. 17820- Banyoles ([email protected]) Final version: 31/01/2017 1 EU NON-NATIVE SPECIES RISK ANALYSIS – RISK ASSESSMENT Channa spp. EU CHAPPEAU QUESTION RESPONSE 1. In how many EU member states has this species been recorded? List An adult specimen of Channa micropeltes was captured on 22 November 2012 at Le them. Caldane (Colle di Val d’Elsa, Siena, Tuscany, Italy) (43°23′26.67′′N, 11°08′04.23′′E).This record of Channa micropeltes, the first in Europe (Piazzini et al. 2014), and it constitutes another case of introduction of an alien species. Globally, exotic fish are a major threat to native ichthyofauna due to their negative impact on local species (Crivelli 1995, Elvira 2001, Smith and Darwall 2006, Gozlan et al. 2010, Hermoso and Clavero 2011). Channa argus in Slovakia (Courtenay and Williams, 2004, Elvira, 2001) Channa argus in Czech Republic (Courtenay and Williams 2004, Elvira, 2001) 2. In how many EU member states has this species currently None established populations? List them. 3. In how many EU member states has this species shown signs of None invasiveness? List them.
    [Show full text]
  • Barcoding Snakeheads (Teleostei, Channidae) Revisited: Discovering Greater Species Diversity and Resolving Perpetuated Taxonomic Confusions
    RESEARCH ARTICLE Barcoding snakeheads (Teleostei, Channidae) revisited: Discovering greater species diversity and resolving perpetuated taxonomic confusions Cecilia Conte-Grand1, Ralf Britz2, Neelesh Dahanukar3,4, Rajeev Raghavan5, Rohan Pethiyagoda6, Heok Hui Tan7, Renny K. Hadiaty8, Norsham S. Yaakob9, Lukas RuÈ ber1,10* a1111111111 a1111111111 1 Naturhistorisches Museum der Burgergemeinde Bern, Bern, Switzerland, 2 Department of Life Sciences, Natural History Museum, London, United Kingdom, 3 Indian Institute of Science Education and Research, a1111111111 Pashan, Pune, Maharashtra, India, 4 Systematics, Ecology & Conservation Laboratory, Zoo Outreach a1111111111 Organization, Saravanampatti, Coimbatore, Tamil Nadu, India, 5 Department of Fisheries Resource a1111111111 Management, Kerala University of Fisheries and Ocean Studies, Kochi, Kerala, India, 6 Ichthyology Section, Australian Museum, Sydney, Australia, 7 Lee Kong Chian Natural History Museum, National University of Singapore, Singapore, Singapore, 8 Museum Zoologicum Bogoriense, Research Center for Biology, Indonesian Institute of Sciences, Cibinong, Indonesia, 9 Forest Research Institute Malaysia, Kepong, Kuala Lumpur, Malaysia, 10 Institute of Ecology and Evolution, University of Bern, Bern, Switzerland OPEN ACCESS * [email protected] Citation: Conte-Grand C, Britz R, Dahanukar N, Raghavan R, Pethiyagoda R, Tan HH, et al. (2017) Barcoding snakeheads (Teleostei, Channidae) Abstract revisited: Discovering greater species diversity and resolving perpetuated taxonomic confusions.
    [Show full text]
  • Giant Snakehead (Channa Micropeltes), and Bullseye Snakehead
    objeNational Control and Management Plan for Members of the Snakehead Family (Channidae) Drawing by: Susan Trammell Submitted to the Aquatic Nuisance Species Task Force Prepared by the Snakehead Plan Development Committee 2014 Committee Members Paul Angelone, U.S. Fish and Wildlife Service Kelly Baerwaldt, U.S. Army Corps of Engineers Amy J. Benson, U.S. Geological Survey Bill Bolen, U.S. Environmental Protection Agency - Great Lakes National Program Office Lindsay Chadderton, The Nature Conservancy, Great Lakes Project Becky Cudmore, Centre of Expertise for Aquatic Risk Assessment, Fisheries and Oceans Canada Barb Elliott, New York B.A.S.S. Chapter Federation Michael J. Flaherty, New York Department of Environmental Conservation, Bureau of Fisheries Bill Frazer, North Carolina Bass Federation Katherine Glassner-Shwayder, Great Lakes Commission Jeffrey Herod, U.S. Fish and Wildlife Service Lee Holt, U.S. Fish and Wildlife Service Nick Lapointe, Carleton University, Ottawa, Ontario Luke Lyon, District of Columbia Department of the Environment, Fisheries Research Branch Tom McMahon, Arizona Game and Fish Department Steve Minkkinen, U.S. Fish and Wildlife Service, Maryland Fishery Resources Office Meg Modley, Lake Champlain Basin Program Josh Newhard, U.S. Fish and Wildlife Service, Maryland Fishery Resources Office Laura Norcutt, U.S. Fish and Wildlife Service, Branch Aquatic Invasive Species, Committee Chair John Odenkirk, Virginia Department of Game and Inland Fisheries Scott A. Sewell, Maryland Bass Nation James Straub, Massachusetts Department of Conservation and Recreation, Lakes and Ponds Program Michele L. Tremblay, Naturesource Communications Martha Volkoff, California Department of Fish and Wildlife, Invasive Species Program Brian Wagner, Arkansas Game and Fish Commission John Wullschleger, National Park Service, Water Resources Division, Natural Resources Stewardship and Science i In Dedication to Walt Courtenay Walter R.
    [Show full text]
  • Pemeliharaan Ikan Gabus Channa Striata Dalam Kolam Tanah Sulfat Masam” Ini Tanpa Hambatan Yang Berarti
    PEMELIHARAAN IKAN GABUS (Channa striata) DALAM KOLAM TANAH SULFAT MASAM Junius Akbar Junius Akbar PEMELIHARAAN IKAN GABUS (Channa striata) DALAM KOLAM TANAH SULFAT MASAM Editor Fatmawati Diterbitkan oleh: Lambung Mangkurat University Press, 2020 d/a Pusat Pengelolaan Jurnal dan Penerbitan ULM Lantai 2 Gedung Perpustakaan Pusat ULM Jalan Hasan Basri, Kayutangi, Banjarmasin, 70123 Telp/Fax. 0511-3305195 ANGGOTA APPTI (004.035.1.03.2018) Hak cipta dilindungi oleh Undang-Undang Dilarang memperbanyak sebagian atau seluruh isi buku ini tanpa izin tertulis dari Penerbit, kecuali untuk kutipan singkat demi penelitian ilmiah atau resensi i-viii + 86 hlm, 18 x 25 cm Cetakan pertama, Nopember 2020 ISBN : 978-623-7533-42-9 PRAKATA Dengan Nama Allah yang Maha Pengasih lagi Maha Penyayang. Apabila Buku ini Bermanfaat, Ya Allah Semoga Amal Kebaikan Mengalir kepada Kedua Orang Tua Hamba. Aamiin Syukur Alhamdulillah penulis panjatkan kehadirat Allah SWT, Tuhan Semesta Alam yang telah melimpahkan Rahmat-Nya sehingga penulis dapat menyelesaikan penyusunan buku dengan judul “Pemeliharaan Ikan Gabus Channa striata dalam Kolam Tanah Sulfat Masam” ini tanpa hambatan yang berarti. Buku ini disusun untuk memenuhi kebutuhan perkuliahan materi Budidaya Perairan pada Mata Kuliah Teknologi Manajemen Budidaya Ikan Rawa program Permata Sakti-Dikti di Fakultas Perikanan dan Kelautan, Universitas Lambung Mangkurat Dalam rangkaian pelaksanaan maupun proses pembuatan buku ini, penulis tidak lepas dari bantuan semua pihak yang sangat berperan dalam keberhasilan yang penulis capai, untuk itu penulis mengucapkan banyak terima kasih. Buku ini merupakan dari hasil penelitian penulis dari Hibah Penelitian Dasar Unggulan Perguruan Tinggi Tahun Anggaran 2017-2018 dan dari kegiatan Program Kemitraan Masyarakat (PKM) yang diperoleh penulis Tahun Anggaran 2020.
    [Show full text]
  • American Fisheries Society •
    VOL 36 NO 8 AUGUST 2011 FisherieAmerican Fisheries Society • www.fisheries.orgs Lorem ipsum dolor sit amet, consectetur adipiscing elit Stream Fragmentation Thresholds for a Reproductive Guild of Great Plains Fishes Annual Report Inside Contrasting Global Game Fish and Non-Game Fish Species 03632415(2011)36(8) VOL 36 NO 8 Fisheries AUGUST 2011 Contents COLUMNS 369 PRESIDENT’S HOOK New Frontiers in Fisheries Management and Ecology: Leading the Way in a Changing World President Hubert ends his term with expressions of gratitude and a little ethical advice. Wayne A. Hubert 411 DIRECTOR’S LINE The Role of U.S. Federal Fisheries Staff in Professional Societies – Part II U.S. federal agency staff have had roadblocks in their participation in professional society affairs. It looks like now there is a serious effort by government to make it easier for them. Gus Rassam UPDATE 380 370 LEGISLATION AND POLICY Great Plains cyprinids suspected or confirmed as members of the Elden W. Hawkes, Jr. pelagic-spawning reproductive guild. FEATURE: FISH HABITAT 399 AFS 2010 ANNUAL REPORT 371 Stream Fragmentation Thresholds for a 400 Introduction Reproductive Guild of Great Plains Fishes 402 Special Projects Length of available riverine habitat between instream bar- 403 Publications riers might be a primary regulator of decline among eight 404 Awards imperiled Great Plains fishes. 406 Contributing Members Joshuah S. Perkin and Keith B. Gido 407 Donors 408 Financials FEATURE: GAME FISH 409 Meeting Planner 385 Contrasting Global Game Fish and Non-Game Fish Species 410 NEW MEMBERS On the road to developing broad strategies for the conservation and management of game fishes at a global CALENDAR scale.
    [Show full text]
  • Budidaya Ikan Gabus Channa
    Setelah ukuran besar (dewasa), ikan gabus dimanfaatkan sebagai ikan konsumsi dan bahan baku pembuatan berbagai makanan tradisional khas daerah. Masyarakat Sumatera Selatan umumnya dan kota Palembang BAGIAN 1 khususnya, sangat gemar makan ikan ini. Masyarakat memanfaatkan ikan PENDAHULUAN gabus sebagai ikan konsumsi sehari-hari, baik dalam bentuk segar maupun dalam bentuk awetan seperti ikan gabus asin dan ikan gabus salai. Selain itu, ikan gabus juga dimanfaatkan sebagai bahan campuran berbagai makanan khas Palembang seperti empek-empek, tekwan, model, burgo, laksan, Pokok Bahasan : Budidaya Ikan Gabus (Channa striata) kerupuk-kemplang. Sub Pokok Bahasan : Prospek Budidaya Ikan Gabus (Channa Pemanfaatan ikan gabus berbagai ukuran dari kecil sampai besar striata) tersebut menyebabkan kebutuhan ikan gabus semakin meningkat. Produksi Tujuan Instruksional Umum : Peserta didik diharapkan dapat mengetahui ikan gabus di Sumatera Selatan masih mengandalkan hasil tangkapan nelayan (TIU) manfaat ikan gabus bagi manusia potensi dari alam. Untuk memenuhi permintaan ikan gabus yang semakin meningkat, ikan gabus sebagai komoditi budidaya. maka intensitas penangkapan ikan ini di alam juga semakin meningkat. Semakin Tujuan Instruksional Khusus: Peserta didik setelah mengikuti pembelajaran intensifnya penangkapan ikan gabus memberikan dampak terhadap (TIK) ini diharapkan : menurunnya populasi ikan gabus di alam. 1. Memahami manfaat ikan gabus bagi Budidaya ikan gabus mempunyai potensi sangat besar untuk kehidupan manusia dikembangkan di Sumatera Selatan. Potensi tersebut dapat dilihat dari potensi 2. Mengetahui potensi biologi ikan gabus biologi ikan gabus sebagai hewan peliharaan (kultivan) budidaya, potensi lahan sebagai hewan budidaya yang dapat digunakan lokasi budidaya serta potensi pasar. Pemasaran ikan 3. Mengetahui potensi lahan yang dapat gabus baik berupa ikan gabus segar maupun berupa produk olahan yang dimanfaatkan untuk budidaya ikan gabus menggunakan ikan gabus sebagai bahan baku pembuatannya.
    [Show full text]
  • Threatened Freshwater Fishes and the Aquarium Pet Markets Rajeev Raghavan University of Kent, Canterbury, U.K
    Roger Williams University DOCS@RWU Feinstein College of Arts & Sciences Faculty Papers Feinstein College of Arts and Sciences 2013 Uncovering an Obscure Trade: Threatened Freshwater Fishes and the Aquarium Pet Markets Rajeev Raghavan University of Kent, Canterbury, U.K Neelesh Dahanukar Zoo Outreach Organization, India Michael F. Tlusty New England Aquarium, John H Prescott aM rine Laboratory, U.S.A Andrew L. Rhyne Roger Williams University, [email protected] K. Krishna Kumar St. Albert’s College, Kochi, India See next page for additional authors Follow this and additional works at: http://docs.rwu.edu/fcas_fp Part of the Biology Commons Recommended Citation Raghaven, R., D. Dahanukar, M. Tlusty, A.L. Rhyne, et al. 2013. "Uncovering an Obscure Trade: Threatened Freshwater Fishes and the Aquarium Pet Markets." Biological Conservation 164: 158-169. This Article is brought to you for free and open access by the Feinstein College of Arts and Sciences at DOCS@RWU. It has been accepted for inclusion in Feinstein College of Arts & Sciences Faculty Papers by an authorized administrator of DOCS@RWU. For more information, please contact [email protected]. Authors Rajeev Raghavan, Neelesh Dahanukar, Michael F. Tlusty, Andrew L. Rhyne, K. Krishna Kumar, Sanjay Molur, and Alison M. Rosser This article is available at DOCS@RWU: http://docs.rwu.edu/fcas_fp/136 Biological Conservation 164 (2013) 158–169 Contents lists available at SciVerse ScienceDirect Biological Conservation journal homepage: www.elsevier.com/locate/biocon Uncovering an obscure trade: Threatened freshwater fishes and the aquarium pet markets ⇑ Rajeev Raghavan a,b,c,d, , Neelesh Dahanukar e,f, Michael F.
    [Show full text]
  • Channa Royi (Teleostei: Channidae): a New Species of Snakehead from Andaman Islands, India
    Indian J. Fish., 65(4): 1-14, 2018 1 DOI: 10.21077/ijf.2018.65.4.72827-01 Channa royi (Teleostei: Channidae): a new species of snakehead from Andaman Islands, India J. PRAVEENRAJ1, J. D. M. KNIGHT2, R. KIRUBA-SANKAR1, BENI HALALLUDIN3, J. J. A. RAYMOND1 AND V. R. THAKUR1 1Fisheries Science Division, ICAR-Central Island Agricultural Research Institute, Port Blair - 744 101 Andaman and Nicobar Islands, India 2Flat ‘L’, Sri Balaji Apartments, 7th Main Road, Dhandeeswaram, Velachery, Chennai - 600 042, Tamil Nadu, India 3JI. Raya Puncak Cibogo II, Rt. 2/6 NO.119, Bogor 16770, Indonesia e-mail: [email protected] ABSTRACT A new species of snakehead fishChanna royi sp. nov., has been described based on 21 specimens collected from the South, Middle and North Andaman Islands, India. It is distinguished from all its congeners by a greenish-grey dorsum, pale brown to black pectoral fin with 2-3 inconspicuous semicircular bands, a series of 7-9 obliquely-arranged, saddle-like, dark olive to grey oblique streaks on green background on upper half of the body, 42-45 pored lateral-line scales, 12-13 branched caudal rays, 6-7 pre-dorsal scales, 43 vertebrae, two rows of teeth on the lower jaw, an outer row of numerous minute slender, pointed teeth and single inner row of large uniform sized teeth without any large canine like teeth on the anterior fourth of the lower jaw. Phylogenetically C. royi sp. nov. is closely related to C. harcourtbutleri, with a genetic distance (K2-P) of 2.4-2.8%, but morphologically differs in having greater inter-orbital width, fewer pelvic-fin rays (5 vs.
    [Show full text]
  • Snakehead Final Rule
    Federal Register / Vol. 67, No. 193 / Friday, October 4, 2002 / Rules and Regulations 62193 DEPARTMENT OF THE INTERIOR proposed rule, 32 were opposed to The tropical species would survive in adding snakeheads to the list of the warmest waters such as extreme Fish and Wildlife Service injurious fishes, and 34 stated their southern Florida, perhaps parts of support for the proposed rule. Of the southern California, Hawaii, and certain 50 CFR Part 16 386 nonrelevant or nonsignificant thermal spring systems and their RIN 1018–AI36 comments, 353 were electronic outflows in the American west. The messages that were generated tropical to subtropical species would Injurious Wildlife Species; Snakeheads erroneously, 13 were electronic have a similar potential range of (family Channidae) messages pertaining to investment distribution as for tropical species but scams, 8 were electronic messages with a greater likelihood of survival AGENCY: Fish and Wildlife Service, pertaining to advertising, one comment during cold winters and more Interior. offered a resume for employment northward limits. The tropical or ACTION: Final rule. opportunities, 2 were unknown, 2 subtropical to warm temperate species offered suggestions/opinions on treating could survive in most southern States. SUMMARY: The U.S. Fish and Wildlife the ponds in Crofton, Maryland, and 7 The warm temperate, and warm Service adds all species of snakehead provided information on sightings of temperate to cold temperate, species fishes in the Channidae family to the list snakeheads. Of the 67 comments that could survive in most areas of the of injurious fish, mollusks, and were considered relevant and United States. crustaceans. By this action, the Service significant, one came from a Federal Although the tropical to subtropical prohibits the importation into or agency, 12 from private organizations, 8 species of snakehead fishes are not transportation between the continental from State agencies, and 46 from private likely to become established in the United States, the District of Columbia, individuals.
    [Show full text]
  • Morphometric and Biometric Index Study of Channa Punctatus (Bloch) from Paddy Field of Sivsagar District, Assam
    J. Biol. Chem. Research. Vol. 29, No. 1: 37-43 (2012) (An International Journal of Life Sciences and Chemistry) ms 19/1-2/2/2012, All rights are reserved ISSN 0970-4973 http:// www.jbcr.in [email protected] [email protected] RESEARCH PAPER Received 5/May/2012 Revised18/May/2012 Accepted 18/May/2012 Morphometric and Biometric Index Study of Channa Punctatus (Bloch) from Paddy Field of Sivsagar District, Assam A. K. Saikia Department of Zoology, Moran College, Moranhat, Assam-785670 ABSTRACT In morphometry of Channa punctatus, the total length was recorded as 9.1cm to 16.3cm whereas total body weight ranged from 11.15g to 43.02g. The mean value of standard length in percentage of total length was found to be 84.25 and head length was found to be 29.6. Mean value of body depth expressed as percentage of total length was 17.6; head depth was 2cm and was calculated to be 15.14; girth length was found as 52.99; dorsal fin length was found to be 10.6 while the mean value of eye diameter in percentage of head length was 12.53. Mean biometric index reveals that growth of head length (HL) in relation to total length (TL) is isometric or having maintained an almost constant biometric index with the increase of length. The growth of head depth (HD) also shows more or less isometric growth. The other parameters such as standard length (SL), body depth (BD), girth length (GL) and eye-diameter (ED), show allometric growth and ratios are not constant with the increase of length.
    [Show full text]
  • Species Lists, Dna Barcodes, and Images for Ornamental Fish
    DEVELOPING MONITORING TOOLS FOR TOMORROW’S INVASIVES: SPECIES LISTS, DNA BARCODES, AND IMAGES FOR ORNAMENTAL FISH YI YOUGUANG NATIONAL UNIVERSITY OF SINGAPORE 2014 DEVELOPING MONITORING TOOLS FOR TOMORROW’S INVASIVES: SPECIES LISTS, DNA BARCODES, AND IMAGES FOR ORNAMENTAL FISH YI YOUGUANG (B.Sc. (Hons 2nd Upper), NUS) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF BIOLOGICAL SCIENCES NATIONAL UNIVERSITY OF SINGAPORE 2014 DECLARATION I hereby declare that this thesis is my original work and it has been written by me in its entirety. I have duly acknowledged all the sources of information which have been used in the thesis. This thesis has also not been submitted for any degree in any university previously. ___________________ YI YOUGUANG 31 March 2014 ACKNOWLEDGEMENTS I would like to thank the PI and colleagues in the Evolutionary Biology Laboratory for providing valuable help and resources, and consultation during my course of research. I especially like to thank Miss Amrita for providing valuable assistance in bioinformatics to make many of my research analyses possible. I will like to thank Dr Ang Yuchen for providing valuable opinion on the aesthetics and effective data presentation in this thesis. Both Amrita, Jayanthi and Yuchen have made substantial contributions in providing the computational scripts and species page templates needed for mass production of ornamental fish species pages. I would like to thank Amrita, Yuchen and Kathy for editing and doing spell check for the thesis. I would like to thank Jayanthi for contributing her computer for data analysis. I will like to thank my supervisor Prof.
    [Show full text]