DOCSLIB.ORG

A Manual for Commercial Production of the Swordtail, Xiphophorus Helleri

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
A Manual for Commercial Production of the Swordtail, Xiphophorus Helleri A Manual for Commercial Production of the Swordtail, Xiphophorus helleri Clyde S. Tamaru, Brian Cole, Rich Bailey, Christopher Brown, and Harry Ako University of Hawaii Sea Grant Extension Service School of Ocean Earth Science and Technology 2525 Correa Road, HIG 237 Honolulu HI 96822 http://www.soest.hawaii.edu/SEAGRANT December 2001 CTSA Publication Number 128 A Manual for Commercial Production of the Swordtail, Xiphophorus helleri Clyde S. Tamaru, Ph.D. Brian Cole, M.S. Rich Bailey, B.S. Christopher Brown, Ph.D. Harry Ako, Ph.D. University of Hawaii Sea Grant Extension Service School of Ocean Earth Science and Technology 2525 Correa Road, HIG 237 Honolulu HI 96822 http://www.soest.hawaii.edu/SEAGRANT Center for Tropical and Subtropical Aquaculture Publication No. 128 December 2001 Table of Contents Table of Contents Acknowledgments ................................................................................................................................ 1 Introduction .......................................................................................................................................... 3 Taxonomy ............................................................................................................................................. 3 The Livebearers .......................................................................................................................... 4 Biology of the Swordtail, Xiphophorus helleri .................................................................................... 4 Geographic Distribution ............................................................................................................. 4 Morphology ................................................................................................................................ 4 Reproductive Biology ................................................................................................................. 6 Sex Ratio .................................................................................................................................... 7 Gestation and Embryonic Development ..................................................................................... 8 Effects of Temperature on Reproduction .................................................................................... 8 Fecundity .................................................................................................................................... 9 Growth ...................................................................................................................................... 10 Culture System ................................................................................................................................... 11 Breeding ................................................................................................................................... 11 Commercial-Scale Production .................................................................................................. 12 Stocking Densities for Growout ............................................................................................... 14 Feeding ..................................................................................................................................... 15 Water Quality............................................................................................................................ 16 Harvesting Livebearers ............................................................................................................. 17 Preparation for harvesting ........................................................................................................ 17 Harvesting Gear ........................................................................................................................ 17 Harvesting by Seine .................................................................................................................. 18 Holding Tanks........................................................................................................................... 19 Grading for Size........................................................................................................................ 19 Preparation of Anesthesia ......................................................................................................... 20 Sorting ...................................................................................................................................... 20 Bagging and Shipping .............................................................................................................. 21 Disease ................................................................................................................................................ 22 Formalin Preparation ................................................................................................................ 23 Economics .......................................................................................................................................... 24 Start-up Costs for Small-scale Module..................................................................................... 24 Factors Affecting the Price of Swordtails ................................................................................. 27 Literature Cited ................................................................................................................................... 29 Recommended Reading and References ............................................................................................ 30 Appendix 1. List of Distributors for Equipment and Supplies ........................................................... 31 Appendix 2. Pictorial Guide of the Sorting Procedure ...................................................................... 35 Appendix 3. Glossary ......................................................................................................................... 36 i Acknowledgments The authors extend a hearty MAHALO to the following contributors to the completion of this handbook: • the United States Department of Agriculture (USDA) Center for Tropical and Subtropical Aquac- ulture (CTSA) through Grants No. 93-38500-8583 and No. 94-38500-0065 • the University of Hawaii Sea Grant Extension Service (SGES) through the United States Depart- ment of Commerce National Oceanic and Atmospheric Administration Project (NOAA) No. A/AS-1, as part of the University of Hawaii School of Ocean Earth Science and Technology (SOEST) Sea Grant College Program UNIHI-SEAGRANT-TR-98-08, under Institutional Grant No. NA36RG0507 • the State of Hawaii Department of Agriculture Aquaculture Development Program (ADP) as part of the Aquaculture Extension Project with the University of Hawaii Sea Grant Extension Service, Contracts No. 9325 and No. 9638 The views expressed herein are those of the authors and do not necessarily reflect the views of CTSA, USDA, NOAA or any of its sub-agencies. Special thanks are extended to: • John Tabata and Jason Akamine for reviewing the original drafts for content • Diane Nakashima for assistance in the production of the cover and layout of the manual • Ron England of Worldwide Aquatics for the 1980-2000 ornamental fish price lists • Christine Tamaru of Hawaii C’s Aquaculture Consultant Services for editing the manual • Kai Lee Awaya (CTSA) and Diane Henderson (SOEST) for their editorial review Photo credits belong to Dr. Clyde Tamaru, University of Hawaii Sea Grant Extension Service. 1 Introduction Introduction Establishing an ornamental fish culture industry has long been felt to be one means to diversify the aquaculture sector in Hawaii. Since 1993, this effort has been supported by the Center for Tropical and Subtropical Aquaculture (CTSA), the University of Hawaii Sea Grant Extension Service (SGES), and the State of Hawaii Department of Agriculture Aquaculture Development Program (ADP). Over the years, the producers of ornamental fishes have requested detailed yet user-friendly information in the areas of controlled reproduction, nutrition, disease, hatchery management, growout techniques, and economics. In response, CTSA, SGES, and ADP have pooled their re- sources for the publication of a series of “How To” manuals covering the commercial production of a variety of ornamental fish species. This manual on the commercial production of the swordtail, Xiphophorus helleri, is the latest in the series. The information presented in these manuals should help farmers to overcome some of the difficulties encountered with the commercial production of ornamental fish in Hawaii. Unless stated otherwise, the methods described have been field-tested locally. The methods suggested in this manual should not be construed as the “only” methods. Hawaii has a diversity of habitats and microclimates. While one method may be suitable for one location, individual experience and expertise will most likely determine any necessary modifications in order to achieve similar results in another. Likewise, although this manual is directed to the culture of the swordtail X. helleri, the methods described could be applied to other livebearing fishes such as the molly, the guppy, and the platy. Taxonomy Taxonomy, or the phylogeny of fishes, is a very complex science incorporating information from the fossil record, anatomical and morphological research, genetics, protein electrophoresis, and DNA testing
Load more

Recommended publications
  • FAMILY Poeciliidae Bonaparte 1831
    FAMILY Poeciliidae Bonaparte 1831 - viviparous toothcarps, livebearers SUBFAMILY Poeciliinae Bonaparte 1831 - viviparous toothcarps [=Unipupillati, Paecilini, Belonesocini, Cyprinodontidae limnophagae, Gambusiinae, Tomeurinae, Poeciliopsinae, Heterandriini, Guirardinini, Cnesterodontini, Pamphoriini, Xiphophorini, Alfarini, Quintanini, Xenodexiinae, Dicerophallini, Scolichthyinae, Priapellini, Brachyrhaphini, Priapichthyini] GENUS Alfaro Meek, 1912 - livebearers [=Furcipenis, Petalosoma, Petalurichthys] Species Alfaro cultratus (Regan, 1908) - Regan's alfaro [=acutiventralis, amazonum] Species Alfaro huberi (Fowler, 1923) - Fowler's alfaro GENUS Belonesox Kner, 1860 - pike topminnows Species Belonesox belizanus Kner, 1860 - pike topminnow [=maxillosus] GENUS Brachyrhaphis Regan, 1913 - viviparous toothcarps [=Plectrophallus, Trigonophallus] Species Brachyrhaphis cascajalensis (Meek & Hildebrand, 1913) - Río Cascajal toothcarp Species Brachyrhaphis episcopi (Steindachner, 1878) - Obispo toothcarp [=latipunctata] Species Brachyrhaphis hartwegi Rosen & Bailey, 1963 - Soconusco gambusia Species Brachyrhaphis hessfeldi Meyer & Etzel, 2001 - Palenque toothcarp Species Brachyrhaphis holdridgei Bussing, 1967 - Tronadora toothcarp Species Brachyrhaphis olomina (Meek, 1914) - Orotina toothcarp Species Brachyrhaphis parismina (Meek, 1912) - Parismina toothcarp Species Brachyrhaphis punctifer (Hubbs, 1926) - Quibari Creek toothcarp Species Brachyrhaphis rhabdophora (Regan, 1908) - Río Grande de Terraba toothcarp [=tristani] Species Brachyrhaphis roseni
    [Show full text]
  • Alien Freshwater Fish, Xiphophorus Interspecies Hybrid (Poeciliidae) Found in Artificial Lake in Warsaw, Central Poland
    Available online at www.worldscientificnews.com WSN 132 (2019) 291-299 EISSN 2392-2192 SHORT COMMUNICATION Alien freshwater fish, Xiphophorus interspecies hybrid (Poeciliidae) found in artificial lake in Warsaw, Central Poland Rafał Maciaszek1,*, Dorota Marcinek2, Maria Eberhardt3, Sylwia Wilk4 1 Department of Genetics and Animal Breeding, Faculty of Animal Sciences, Warsaw University of Life Sciences, ul. Ciszewskiego 8, 02-786 Warsaw, Poland 2 Faculty of Animal Sciences, Warsaw University of Life Sciences, ul. Ciszewskiego 8, 02-786 Warsaw, Poland 3 Faculty of Veterinary Medicine, Warsaw University of Life Sciences, ul. Ciszewskiego 8, 02-786 Warsaw, Poland 4 Veterinary Clinic “Lavia-Vet”, Jasionka 926, 36-002, Jasionka, Poland *E-mail address: [email protected] ABSTRACT This paper describes an introduction of aquarium ornamental fish, Xiphophorus interspecies hybrid (Poeciliidae) in an artificial water reservoir in Pole Mokotowskie park complex in Warsaw, Poland. Caught individuals have been identified, described and presented in photographs. Measurements of selected physicochemical parameters of water were made and perspectives for the studied population were evaluated. The finding is discussed with available literature describing introductions of alien species with aquaristical origin in Polish waters. Keywords: aquarium, invasive species, ornamental pet, green swordtail, southern platyfish, variatus platy, stone maroko, Pole Mokotowskie park complex, Xiphophorus ( Received 14 July 2019; Accepted 27 July 2019; Date of Publication 29 July 2019 ) World Scientific News 132 (2019) 291-299 1. INTRODUCTION The fish kept in aquariums and home ponds are often introduced to new environment accidentaly or intentionaly by irresponsible owners. Some species of these ornamental animals are characterized by high expansiveness and tolerance to water pollution, which in the case of their release in a new area may result in local ichthyofauna biodiversity decline.
    [Show full text]
  • Strong Reproductive Skew Among Males in the Multiply Mated Swordtail Xiphophorus Multilineatus (Teleostei)
    Journal of Heredity 2005:96(4):346–355 ª The American Genetic Association. 2005. All rights reserved. doi:10.1093/jhered/esi042 For Permissions, please email: [email protected]. Advance Access publication March 2, 2005 Strong Reproductive Skew Among Males in the Multiply Mated Swordtail Xiphophorus multilineatus (Teleostei) J. LUO,M.SANETRA,M.SCHARTL, AND A. MEYER From Fachbereich Biologie, Universita¨t Konstanz, 78457 Konstanz, Germany (Luo, Sanetra, and Meyer); and Physiologische Chemie I, Biozentrum der Universita¨t, Am Hubland, 97074 Wu¨rzburg, Germany (Schartl). Address correspondence to Axel Meyer, Fachbereich Biologie, Universita¨t Konstanz, Fach M617, Universita¨tsstrasse 10, 78457 Konstanz, Germany, or e-mail: [email protected]. Abstract Male swordtails in the genus Xiphophorus display a conspicuous ventral elongation of the caudal fin, the sword, which arose through sexual selection due to female preference. Females mate regularly and are able to store sperm for at least 6 months. If multiple mating is frequent, this would raise the intriguing question about the role of female choice and male-male competition in shaping the mating system of these fishes. Size-dependent alternate mating strategies occur in Xiphophorus; one such strategy is courtship with a sigmoid display by large dominant males, while the other is gonopodial thrusting, in which small subordinate males sneak copulations. Using microsatellite markers, we observed a frequency of multiple paternity in wild-caught Xiphophorus multilineatus in 28% of families analyzed, but the actual frequency of multiple mating suggested by the correction factor PrDM was 33%. The number of fathers contributing genetically to the brood ranged from one to three.
    [Show full text]
  • The Evolution of the Placenta Drives a Shift in Sexual Selection in Livebearing Fish
    LETTER doi:10.1038/nature13451 The evolution of the placenta drives a shift in sexual selection in livebearing fish B. J. A. Pollux1,2, R. W. Meredith1,3, M. S. Springer1, T. Garland1 & D. N. Reznick1 The evolution of the placenta from a non-placental ancestor causes a species produce large, ‘costly’ (that is, fully provisioned) eggs5,6, gaining shift of maternal investment from pre- to post-fertilization, creating most reproductive benefits by carefully selecting suitable mates based a venue for parent–offspring conflicts during pregnancy1–4. Theory on phenotype or behaviour2. These females, however, run the risk of mat- predicts that the rise of these conflicts should drive a shift from a ing with genetically inferior (for example, closely related or dishonestly reliance on pre-copulatory female mate choice to polyandry in conjunc- signalling) males, because genetically incompatible males are generally tion with post-zygotic mechanisms of sexual selection2. This hypoth- not discernable at the phenotypic level10. Placental females may reduce esis has not yet been empirically tested. Here we apply comparative these risks by producing tiny, inexpensive eggs and creating large mixed- methods to test a key prediction of this hypothesis, which is that the paternity litters by mating with multiple males. They may then rely on evolution of placentation is associated with reduced pre-copulatory the expression of the paternal genomes to induce differential patterns of female mate choice. We exploit a unique quality of the livebearing fish post-zygotic maternal investment among the embryos and, in extreme family Poeciliidae: placentas have repeatedly evolved or been lost, cases, divert resources from genetically defective (incompatible) to viable creating diversity among closely related lineages in the presence or embryos1–4,6,11.
    [Show full text]
  • Fish Larvae, Development, Allometric Growth, and the Aquatic Environment
    II. Developmental and environmental interactions ICES mar. Sei. Symp., 201: 21-34. 1995 Fish larvae, development, allometric growth, and the aquatic environment J. W. M. Osse and J. G. M. van den Boogaart Osse, J. W. M., and van den Boogaart, J. G. M. 1995. Fish larvae, development, allometric growth, and the aquatic environment. - ICES mar. Sei. Symp., 201: 21-34. During metamorphosis, fish larvae undergo rapid changes in external appearance and dimensions of body parts. The juveniles closely resemble the adult form. The focus of the present paper is the comparison of stages of development of fishes belonging within different taxa in a search for general patterns. The hypothesis that these patterns reflect the priorities of vital functions, e.g., feeding, locomotion, and respiration, is tested taking into account the size-dependent influences of the aquatic environment on the larvae. A review of some literature on ailometries of fish larvae is given and related to the rapidly changing balance between inertial and viscous forces in relation to body length and swimming velocity. New data on the swimming of larval and juvenile carp are presented. It is concluded that the patterns of development and growth shows in many cases a close parallel with the successive functional requirements. J. W. M. Osse and J. G. M. van den Boogaart: Wageningen Agricultural University, Department of Experimental Animal Morphology and Cell Biology, Marijkeweg 40, 6709 PG Wageningen, The Netherlands [tel: (+31) (0)317 483509, fax: (+31) (0)317 483962], Introduction Fish larvae, being so small, must have problems using their limited resources for maintenance, activity, obtain­ Fish larvae are the smallest free-living vertebrates.
    [Show full text]
  • Uncorrected Proofs for Review Only C5478.Indb 28 1/24/11 2:08:33 PM M
    Chapter 3 Variation and evolution of reproductive strategies Marcelo N. Pires, Amanda Banet, Bart J. A. Pollux, and David N. Reznick 3.1 Introduction sociation between these two traits suggests that one of the two traits might be more likely to evolve when the other he family poeciliidae (Rosen & Bailey 1963) trait is already present (the latter facilitating the evolu- consists of a well-defi ned, monophyletic group of tion of the former). However, the existence of a notable Tnearly 220 species with a fascinating heterogene- exception in the literature (the lecithotrophic, superfetat- ity in life-history traits. Reznick and Miles (1989a) made ing Poeciliopsis monacha, the only known exception at the one of the fi rst systematic attempts to gather information time) showed that superfetation and matrotrophy were not from a widely scattered literature on poeciliid life histo- strictly linked, indicating that these two traits can evolve ries. They focused on two important female reproductive independently of each other. traits: (1) the ability to carry multiple broods at different Reznick and Miles (1989a) also proposed a framework developmental stages (superfetation; Turner 1937, 1940b, for future research that was aimed at evaluating possible 1940c), which tends to cause females to produce fewer off- causes and mechanisms for the evolution of superfetation spring per brood and to produce broods more frequently, and matrotrophy by (1) gathering detailed life-history de- and (2) the provisioning of eggs and developing embryos scriptions of a greater number of poeciliid species, either by the mother, which may occur prior to (lecithotrophy) or through common garden studies or from fi eld-collected after (matrotrophy) fertilization.
    [Show full text]
  • How the Xiphophorus Problem Arrived in San Marcos, Texas
    Mar. Biotechnol. 3, S6–S16, 2001 DOI: 10.1007/s10126-001-0022-5 © 2001 Springer-Verlag New York Inc. How the Xiphophorus Problem Arrived in San Marcos, Texas Klaus D. Kallman Department of Ichthyology, Division of Vertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, U.S.A. The Genetic Stock Center can trace its origin to Myron exciting and successful was initiated early in Gordon’s ca- Gordon’s doctoral research at Cornell University. He began reer, and one hopes it will be continued in the future. his scientific work in 1924 while still an undergraduate stu- Whereas the development of melanoma in certain platyfish- dent with 6 platyfish of a domesticated stock, and the fol- swordtail hybrids was predictable, the sporadic appearance lowing year he added some swordtails. Platyfish and sword- of such growths in some platyfish presented a problem. tails were not new to him because already as a teenager he While working on his thesis at Cornell, Gordon reasoned had kept many tropical fish. But a great enthusiasm for that platyfish were known only from the hobby and had genetics was aroused by Professor A.C. Fraser in the De- been bred for many years under domestication and hybrid- partment of Plant Breeding. Other professors at Cornell ized with swordtails. He could not determine whether platy- who took a great interest in his work were H.D. Reed (Zo- fish of natural populations also developed pigment cell ab- ology), who was his official sponsor, and G.C. Embody normalities or whether the occurrence of melanoma in the (Limnology) and R.A.
    [Show full text]
  • Options for Selectively Controlling Non-Indigenous Fish in the Upper Colorado River Basin
    Options for Selectively Controlling Non-Indigenous Fish in the Upper Colorado River Basin Draft Report June 1995 Leo D. Lentsch Native Fish and Herptile Coordinator Utah Division of Wildlife Resources Robert Muth Larval Fish Lab Colorado State University Paul D. Thompson Native Fish Biologist Utah Division of Wildlife Resources Dr. Todd A. Crowl Utah State University and Brian G. Hoskins Native Fish Technician Utah Division of Wildlife Resources Utah Division of Wildlife Resources Colorado River Fishery Project Salt Lake City, Utah TABLE OP CONTENTS PAGE ABSTRACT .......................... INTRODUCTION ...................... Non-Indigenous Problems ..... Objectives ................... Control Options ............. Mechanical Control ..... Chemical Control ....... Biological Control ..... Physicochemical Control METHODS .......................................................... Literature Review .......................................... Species Accounts ........................................... RESULTS .......................................................... Species Accounts ........................................... Clupeidae-Herrings ................................... Threadfin Shad .................................. Cyprinidae-Carps and Minnows ........................ Red Shiner ...................................... Common Carp ..................................... Utah Chub ........................................ Leathers ide Chub ................................ Brassy Minnow ................................... Plains Minnow
    [Show full text]
  • Direct and Indirect Effects of the Guppy, Poecilia Reticulata, on the Structure and Function of Stream Ecosystems in the Norther
    DIRECT AND INDIRECT EFFECTS OF THE GUPPY, POECILIA RETICULATA, ON THE STRUCTURE AND FUNCTION OF STREAM ECOSYSTEMS IN THE NORTHERN RANGE MOUNTAINS OF TRINIDAD by TROY NATHANIEL SIMON (Under the Direction of Catherine M. Pringle) ABSTRACT We are currently in the middle of the sixth mass extinction, thus predicting the ecological consequences of species loss from communities is a high priority research topic. Additionally, characterizing the ecosystem impact of macroconsumers has strong conservation implications, given the global trend in biodiversity loss toward higher trophic levels. The goal of this dissertation was to use Trinidadian guppies in the mountain streams of Northern Trinidad as a model system to explore several potentially important direct and indirect ecosystem effects of macroconsumers, which we have little understanding of in natural systems. This collection of studies utilizes both localized exclusion of macroconsumers using underwater electric fences within pools, as well as the natural reach-scale exclusion of guppies above and below barrier waterfalls to examine the ecosystem-level effects of macroconsumers. Results show that local adaptation of guppy populations, to the absence of large piscivores in higher elevation streams, shifted their top-down effects from reducing macroinvertebrate standing stock biomass, to reducing primary producer standing stock biomass. Additionally, the consumptive and non-consumptive effects guppies had similar but opposing effects on algal growth and biomass, which resulted in strong treatment effects from excluding guppies on primary algae. Finally, the loss of omnivorous guppies from a macroconsumer assemblage can alter the strength of top down effects of the remaining macroconsumer community on an important ecosystem-level process at both local- and landscape-scales.
    [Show full text]
  • Appendix A: Common and Scientific Names for Fish and Wildlife Species Found in Idaho
    APPENDIX A: COMMON AND SCIENTIFIC NAMES FOR FISH AND WILDLIFE SPECIES FOUND IN IDAHO. How to Read the Lists. Within these lists, species are listed phylogenetically by class. In cases where phylogeny is incompletely understood, taxonomic units are arranged alphabetically. Listed below are definitions for interpreting NatureServe conservation status ranks (GRanks and SRanks). These ranks reflect an assessment of the condition of the species rangewide (GRank) and statewide (SRank). Rangewide ranks are assigned by NatureServe and statewide ranks are assigned by the Idaho Conservation Data Center. GX or SX Presumed extinct or extirpated: not located despite intensive searches and virtually no likelihood of rediscovery. GH or SH Possibly extinct or extirpated (historical): historically occurred, but may be rediscovered. Its presence may not have been verified in the past 20–40 years. A species could become SH without such a 20–40 year delay if the only known occurrences in the state were destroyed or if it had been extensively and unsuccessfully looked for. The SH rank is reserved for species for which some effort has been made to relocate occurrences, rather than simply using this status for all elements not known from verified extant occurrences. G1 or S1 Critically imperiled: at high risk because of extreme rarity (often 5 or fewer occurrences), rapidly declining numbers, or other factors that make it particularly vulnerable to rangewide extinction or extirpation. G2 or S2 Imperiled: at risk because of restricted range, few populations (often 20 or fewer), rapidly declining numbers, or other factors that make it vulnerable to rangewide extinction or extirpation. G3 or S3 Vulnerable: at moderate risk because of restricted range, relatively few populations (often 80 or fewer), recent and widespread declines, or other factors that make it vulnerable to rangewide extinction or extirpation.
    [Show full text]
  • Summary Report of Freshwater Nonindigenous Aquatic Species in U.S
    Summary Report of Freshwater Nonindigenous Aquatic Species in U.S. Fish and Wildlife Service Region 4—An Update April 2013 Prepared by: Pam L. Fuller, Amy J. Benson, and Matthew J. Cannister U.S. Geological Survey Southeast Ecological Science Center Gainesville, Florida Prepared for: U.S. Fish and Wildlife Service Southeast Region Atlanta, Georgia Cover Photos: Silver Carp, Hypophthalmichthys molitrix – Auburn University Giant Applesnail, Pomacea maculata – David Knott Straightedge Crayfish, Procambarus hayi – U.S. Forest Service i Table of Contents Table of Contents ...................................................................................................................................... ii List of Figures ............................................................................................................................................ v List of Tables ............................................................................................................................................ vi INTRODUCTION ............................................................................................................................................. 1 Overview of Region 4 Introductions Since 2000 ....................................................................................... 1 Format of Species Accounts ...................................................................................................................... 2 Explanation of Maps ................................................................................................................................
    [Show full text]
  • Poecilia Sphenops Valenciennes, 1846 (Cyprinodontiformes
    Check List 9(5): 1129–1131, 2013 © 2013 Check List and Authors Chec List ISSN 1809-127X (available at www.checklist.org.br) Journal of species lists and distribution N Poecilia sphenops Valenciennes, 1846 (Cyprinodontiformes, ISTRIBUTIO Brazil D Poeciliidae): New record in rio Sergipe basin, northeastern 1* 1 RAPHIC , Marlene Silva de Almeida Pereira and Carlos Augusto G Figueiredo2 EO Marcelo Fulgêncio Guedes de Brito G N O 1 Universidade Federal de Sergipe, Programa de Pós-Graduação em Ecologia e Conservação. Av. Marechal Rondon s/n, Rosa Elze. CEP OTES 49100-000. São Cristóvão, Sergipe, SE, Brazil. N * 2 CorrUniversidadeesponding Federal author. do Email: Estado [email protected] do Rio de Janeiro, Instituto de Biociências, Núcleo de Gestão Ambiental, Av. Pasteur, nº 458, Sala 512-F. CEP 22290-240. Rio de Janeiro, RJ, Brazil. Abstract: Poecilia sphenops Valenciennes, 1846 in The present paper reports the first record of non-native species northeastern Brazil in rio Sergipe basin, a coastal drainage of the Sergipe state.P. sphenops This species was collected at seven sites in the Caatinga biome. The cause of the introduction is not known, but we believe it is a direct impact of the aquarium trade absencethrough theof parental aquarium care dumping such as performed Astyanax lacustrisby hobbyists. and Serrapinnus The presence heterodon of in natural waterbodies increases nativeconcerns poeciliid for interference Poecilia vivipara with native. ecosystems, and the risk of eggs predation in native species with low fecundity and , competition and hybridization with the Poeciliidae is the most important family of Cyprinodontiformes, represented from eastern United trade (Axelrod et al.
    [Show full text]