Distribution of Mercury in Water, Sediment and Fish from the Volta Lake and Its Major Tributaries
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Preliminary Studies on the Food and Feeding Habits of Synodontis Membraneceus from Ogobiri River, Nigeria
r 233 Preliminary studies on the food and feeding habits of Synodontis membraneceus from Ogobiri River, Nigeria Allison, M. E. / Youdubagha, S. E. Abstract Thefood andfeeding habits of Synodontis membraneceus of Ogobiri River of Bayelsa State, Nigeria was studied using 44 male and 51 female specimens that were boughtfrom fishers in the study area measuring between 5 and 25 em total length. The Numerical and the Frequency of Occurrence method of analysis were used. For the males, thefood items by the numerical method were copepods (168), insects, (118), Cladocera (69), and unidentified items (32). In thefemale specimens, thefood items were Cladocera (286), Insect (216) Copepod (100) and unidentified organisms/materials (65). In the Frequency of Occurrence method for the males, Copepod was still the highest with a total of (48), Cladocera (44), Insects (29) and unidentified (I 6). For thefemales, Cladoera (48), Insects were (30) followed by Copepods (35) and unidentified (J9). The Percentage composition offood items by the Numerical method was Cladocera (45.5%), Insects (34.5%), Copepod (12.5%), and unidentified items (7.0%) while the Percentage Frequency of Occurrence was, Cla• docera (30.5%), Insects (30.9%), Copepod (29.6%), and unidentified items (9.0%). Keywords:Numerical method,frequency of occurrence, S. membraneceus, Ogobiri River. Introduction ish is a very important source of food for humans (FAO, 2010). Information about the food habits of fishes is on defin• ing predator-prey relationship (Saa et al., 1997) and the creation of trophic models as a tool to understanding complete Fecosystem (Lopez-Perata and Arcila, 2002; Bachok et al., 2004). -
§4-71-6.5 LIST of CONDITIONALLY APPROVED ANIMALS November
§4-71-6.5 LIST OF CONDITIONALLY APPROVED ANIMALS November 28, 2006 SCIENTIFIC NAME COMMON NAME INVERTEBRATES PHYLUM Annelida CLASS Oligochaeta ORDER Plesiopora FAMILY Tubificidae Tubifex (all species in genus) worm, tubifex PHYLUM Arthropoda CLASS Crustacea ORDER Anostraca FAMILY Artemiidae Artemia (all species in genus) shrimp, brine ORDER Cladocera FAMILY Daphnidae Daphnia (all species in genus) flea, water ORDER Decapoda FAMILY Atelecyclidae Erimacrus isenbeckii crab, horsehair FAMILY Cancridae Cancer antennarius crab, California rock Cancer anthonyi crab, yellowstone Cancer borealis crab, Jonah Cancer magister crab, dungeness Cancer productus crab, rock (red) FAMILY Geryonidae Geryon affinis crab, golden FAMILY Lithodidae Paralithodes camtschatica crab, Alaskan king FAMILY Majidae Chionocetes bairdi crab, snow Chionocetes opilio crab, snow 1 CONDITIONAL ANIMAL LIST §4-71-6.5 SCIENTIFIC NAME COMMON NAME Chionocetes tanneri crab, snow FAMILY Nephropidae Homarus (all species in genus) lobster, true FAMILY Palaemonidae Macrobrachium lar shrimp, freshwater Macrobrachium rosenbergi prawn, giant long-legged FAMILY Palinuridae Jasus (all species in genus) crayfish, saltwater; lobster Panulirus argus lobster, Atlantic spiny Panulirus longipes femoristriga crayfish, saltwater Panulirus pencillatus lobster, spiny FAMILY Portunidae Callinectes sapidus crab, blue Scylla serrata crab, Samoan; serrate, swimming FAMILY Raninidae Ranina ranina crab, spanner; red frog, Hawaiian CLASS Insecta ORDER Coleoptera FAMILY Tenebrionidae Tenebrio molitor mealworm, -
Three Simple Rules for High Catches, High Profits and Healthy Ecosystems
Three simple rules for high catches, high profits and healthy ecosystems Position paper for the round-table discussion Towards a Sustainable Fishery Sector Block 2, Interactions between Fisheries and Nature, Wednesday 23 June 2021 by Rainer Froese, GEOMAR, Kiel, Germany, [email protected] Rule 1: Do not take out more than is regrown Taking out more than is regrown is called overfishing and will shrink the fished stock below levels that can produce the maximum longterm catch (MSY). Despite the legal obligation to end overfishing in 2020, the total allowed catches (TACs) for about 40% of the stocks with suitable data in the North Sea and adjacent waters constituted overfishing (1). Overfishing is stupid: with overfishing, more effort = money is spent to get lower catches than possible at lower value and with unnecessarily high impacts on the ecosystem. The lower value is caused by overfishing shrinking the mean size of the fish and smaller fish bring lower price per kg. Impact is unnecessary high because better catches can be obtained from non- overfished stocks with less gear deployment, therefore less by-catch and less physical impact. To end overfishing, catches have to be reduced for 1-4 years, depending on current stock size. The loss caused by such reduced catches is easily regained within a few years after rebuilt stock size allows for permanent high catches at e.g. 90% of the MSY level. The 90% MSY is needed for stability; with fishing at MSY, there is a 50% chance of shrinking the stock below the MSY level and thus reducing future catches. -
Structure and Dynamics of Demersal Assemblages on the Continental Shelf and Upper Slope Off Ghana, West Africa
MARINE ECOLOGY PROGRESS SERIES Vol. 220: 1–12, 2001 Published September 27 Mar Ecol Prog Ser Structure and dynamics of demersal assemblages on the continental shelf and upper slope off Ghana, West Africa Kwame A. Koranteng* Marine Fisheries Research Division, PO Box BT-62, Tema, Ghana ABSTRACT: Using two-way indicator species analysis and detrended correspondence analysis, species on the continental shelf and upper slope of Ghana were classified into 6 assemblages. The structure of the assemblages is determined primarily by depth and type of sediment on the seabed. There are clear faunal discontinuities around 30–40, 100 and 200 m depth. The dynamics of the assemblages are influenced by physico-chemical parameters of the water masses, mainly tempera- ture, salinity and dissolved oxygen, which are periodically modified by the seasonal coastal upwelling that occurs in the area. The observed changes in the composition and relative importance of species in the assemblages can be related to increased fishing activity and environmental forcing. KEY WORDS: Species assemblages · Structure and dynamics · Continental shelf and slope · Ghana Resale or republication not permitted without written consent of the publisher INTRODUCTION nental shelf using data from the Guinean Trawling Survey (Williams 1968). In fisheries, defining the aggregation of species in In the last 3 decades, significant changes have the ecosystem is the basis for managing species by the occurred in the biological and physical components of management unit approach (Tyler et al. 1982). Caddy the Gulf of Guinea marine ecosystem and in nearshore & Sharp (1986) also pointed out that such studies are forcing factors that could have an effect on species necessary to gain a better understanding of multi- aggregations in the sub-region (Koranteng 1998). -
Production and Maximum Sustainable Yield of Fisheries Activity in Hulu Sungai Utara Regency
E3S Web of Conferences 147, 02008 (2020) https://doi.org/10.1051/e3sconf/202014702008 3rd ISMFR Production and Maximum Sustainable Yield of fisheries activity in Hulu Sungai Utara Regency Aroef Hukmanan Rais* and Tuah Nanda Merlia Wulandari Balai Riset Perikanan Perairan Umum dan Penyuluhan Perikanan, Jln. Gub. HA Bastari, No.08 Jakabaring, Palembang, Indonesia Abstract. Production and fishing activities of inland waters in the Hulu Sungai Utara Regency (HSU) have a large contribution to fulfill the food needs for the local people in South Borneo. A total of 65% of the inland waters in the HSU Regency are floodplains. This research aimed to describe the production of capture fisheries products from 2010 to 2016, the catch per unit of effort (CPUE), the estimation of maximum sustainable (MSY), the biodiversity of fish species in the flood plain waters of Hulu Sungai Utara Regency (HSU). Research and field data collection was carried out throughout 2016, by collecting fishing gears and catch data from fishermen at Tampakang Village and Palbatu Village. The highest fish production was found in 2014, which reached a value of 2053 tons/year, and tended to decline in the following year. The highest catch per unit of effort per year was found to be in 2014 (151.65 tons/effort), and significantly dropped in 2016 (36.05 tons/effort). The Maximum Sustainable Yield (MSY) analysis obtained a value of 2103.13 tons/year with an effort value of 16.57 for standard fishing gear. The research identified 31 species of fish and the largest composition was baung (Mystusnemurus) and Nila (Tilapia nilotica). -
Food and Feeding Habits of Tilapia Zilli (Pisces: Cichlidae) in River Otamiri South-Eastern Nigeria
Bioscience Discovery 3(2):146-148, June 2012 ISSN: 2229-3469 (Print) FOOD AND FEEDING HABITS OF TILAPIA ZILLI (PISCES: CICHLIDAE) IN RIVER OTAMIRI SOUTH-EASTERN NIGERIA Agbabiaka L. A. Department of Fisheries Technology, Federal Polytechnic Nekede, Owerri, Nigeria P.M.B. 1036, OWERRI, IMO STATE. NIGERIA [email protected] ABSTRACT Dietary habits of Tilapia zilli (Gervais, 1848) was studied in River Otamiri, Imo State, Nigeria. Fish specimens were procured from Artisanal fishermen every two weeks. Specimens were usually injected 4% formalin at the fishing station prior to laboratory analysis. A total of 97 specimens were analyzed for gut contents using Numerical and frequency of occurrence methods. Data collected showed that Tilapia zilli is an Omnivorous fish with dietary preference for Algae (71.05% and 59.52%), vegetative matter (10.52% and 50.00%), detritus (0% and 11.90%) and aquatic invertebrates larvae such as Chaoborus larvae (52.63% and 47.61%) and Chironomid larvae (31.58% and 21.43%) for juveniles and adult Tilapia respectively. Key words: Dietary habits, Tilapia zilli, River Otamiri, Omnivorous. INTRODUCTION MATERIALS AND METHODS Family Cichlidae comprising of Tilapia and River Otamiri lies between latitude 50 301 and 70 Hemichromis species are endemic to Nigeria, it is 301 North, and longitude 50 390 and 50 421 East. The widely distributed in Nigeria waters and second entire study area is about 20km representing the most abundant fish species at River Otamiri Southern part of the River along Obinze-Umuagwo (Agbabiaka, 2010). Various researchers have stretch in Imo State, Nigeria. Three sampling points investigated food and feeding habits of Cichlids and were located namely Obinze, Mgbirichi, and other commercially important fishes in Nigeria and Umuagwo which were about 7km intervals. -
Welcome to Fishbase
Welcome to FishBase FishBase contains different things for different people FishBase is an information system with key data on the biology of all fishes. Similar to an encyclopedia, FishBase contains different things for different people. For example, fisheries managers will dive into the largest existing compilation of population dynamics data; teachers and students will find numerous graphs illustrating basic concepts of fish biology; conservationists will use the lists of threatened fishes for any given country; policymakers may be interested in a chronological, annotated list of introductions to their country; research scientists, as well as funding agencies, will find it useful to gain a quick overview of what is known about a certain species; zoologists and physiologists will have the largest existing compilations of fish morphology, metabolism, gill area, brain size, eye pigment, or swimming speed at their fingertips; ecologists will likewise use data on diet composition, trophic levels, food consumption and predators as inputs for their models; the fishing industry will find proximate analyses, as well as processing recommendations for many marine species; anglers will enjoy a listing of all game fishes occurring in a particular country; and scholars interested in local knowledge will find more than 300,000 common names of fishes together with the language/culture in which they are used and comments on their etymology. Unexpected usage of FishBase The above text shows the usage of FishBase that we expected when we first published it on CD- ROM and later on the Internet, in the late 1990s. That assessment has been largely correct with regard to scientific use, which led to over 5000 citations of FishBase as counted by Google Scholar. -
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 -
Catalogue of Some Saltwater and Freshwater Fish Species of the Niger Delta Region of Nigeria
Catalogue of Some Saltwater and Freshwater Fish Species of the Niger Delta Region of Nigeria Ekinadose Orose, Edafe Odioko and Okechukwu Kenneth Wokeh * Department of Animal and Environmental Biology, Hydrobiology and Fisheries Unit, University of Port Harcourt, PMB 5323, Port Harcourt, Rivers State, Nigeria. World Journal of Advanced Research and Reviews, 2021, 09(03), 056–084 Publication history: Received on 29 January 2021; revised on 27 February 2021; accepted on 01 March 2021 Article DOI: https://doi.org/10.30574/wjarr.2021.9.3.0075 Abstract The study was done to review some saltwater and freshwater fish species in the Niger Delta region of Nigeria. The Niger Delta is one of the most prominent regions in Nigeria, endowed with several water bodies that are distributed as freshwater like rivers, lakes, streams and creeks. These freshwater ecosystems in the region, are abundantly endowed with fish species such as Clarias gariepinus, Pila ovate, Labeo coubie, Synodontis budgetti and Synodontis eupterus. Apart from the freshwaters, the region also has vast marine ecosystem with abundance of fish species such as Elops lacerta, Mugil cephalus, Thais coronata, Periophthalmus papilio, Tympanotonus fuscatus, and Sardinella maderensis. Unfortunately, many of these fish species are endangered due to constant pollution in the Niger delta regional coastal environment. As a result, it is important to document some available freshwater and marine water fish species which will serve as a reference material for both academics and research institutions, should any of the fish species go into extinction. Keywords: Extinction, Coastal Waters, Marine Diversity, Niger Delta 1. Introduction Nigeria’s coastal waters fall within the Guinea Current Large Ecosystem (GCLME), a shared resource by all the coastal West African countries. -
Summary of Temperature Metrics for Aquatic Invasive Fish Species in the Prairie Region
Summary of Temperature Metrics for Aquatic Invasive Fish Species in the Prairie Region Theresa E. Mackey, Caleb T. Hasler, and Eva C. Enders Fisheries and Oceans Canada Ecosystems and Oceans Science Central and Arctic Region Freshwater Institute Winnipeg, MB R3T 2N6 2019 Canadian Technical Report of Fisheries and Aquatic Sciences 3308 1 Canadian Technical Report of Fisheries and Aquatic Sciences Technical reports contain scientific and technical information that contributes to existing knowledge but which is not normally appropriate for primary literature. Technical reports are directed primarily toward a worldwide audience and have an international distribution. No restriction is placed on subject matter and the series reflects the broad interests and policies of Fisheries and Oceans Canada, namely, fisheries and aquatic sciences. Technical reports may be cited as full publications. The correct citation appears above the abstract of each report. Each report is abstracted in the data base Aquatic Sciences and Fisheries Abstracts. Technical reports are produced regionally but are numbered nationally. Requests for individual reports will be filled by the issuing establishment listed on the front cover and title page. Numbers 1-456 in this series were issued as Technical Reports of the Fisheries Research Board of Canada. Numbers 457-714 were issued as Department of the Environment, Fisheries and Marine Service, Research and Development Directorate Technical Reports. Numbers 715-924 were issued as Department of Fisheries and Environment, Fisheries and Marine Service Technical Reports. The current series name was changed with report number 925. Rapport technique canadien des sciences halieutiques et aquatiques Les rapports techniques contiennent des renseignements scientifiques et techniques qui constituent une contribution aux connaissances actuelles, mais qui ne sont pas normalement appropriés pour la publication dans un journal scientifique. -
Dictionary of Ò,Nì,Chà Igbo
Dictionary of Ònìchà Igbo 2nd edition of the Igbo dictionary, Kay Williamson, Ethiope Press, 1972. Kay Williamson (†) This version prepared and edited by Roger Blench Roger Blench Mallam Dendo 8, Guest Road Cambridge CB1 2AL United Kingdom Voice/ Fax. 0044-(0)1223-560687 Mobile worldwide (00-44)-(0)7967-696804 E-mail [email protected] http://www.rogerblench.info/RBOP.htm To whom all correspondence should be addressed. This printout: November 16, 2006 TABLE OF CONTENTS Abbreviations: ................................................................................................................................................. 2 Editor’s Preface............................................................................................................................................... 1 Editor’s note: The Echeruo (1997) and Igwe (1999) Igbo dictionaries ...................................................... 2 INTRODUCTION........................................................................................................................................... 4 1. Earlier lexicographical work on Igbo........................................................................................................ 4 2. The development of the present work ....................................................................................................... 6 3. Onitsha Igbo ................................................................................................................................................ 9 4. Alphabetization and arrangement.......................................................................................................... -
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The bony anatomy of Chadian Synodontis (Osteichthyes, Teleostei, Siluriformes, Mochokidae): interspecifi c variations and specifi c characters Aurélie PINTON Olga OTERO Université Poitiers, Bâtiment des Sciences naturelles, Faculté des Sciences fondamentales et appliquées, Institut international de Paléoprimatologie, Paléontologie humaine : Évolution et Paléoenvironnements (IPHEP), CNRS UMR 6046, 40 av. du Recteur Pineau, F-86022 Poitiers cedex (France) [email protected] [email protected] Pinton A. & Otero O. 2010. — The bony anatomy of Chadian Synodontis (Osteichthyes, Teleostei, Siluriformes, Mochokidae): interspecifi c variations and specifi c characters. Zoosystema 32 (2) : 173-231. ABSTRACT Th e genus Synodontis Cuvier, 1816 (Siluriformes, Mochokidae) numbers about 120 species and is exclusive to the freshwater of Africa except Maghreb and Cape Province. It is one of the most widespread catfi sh of African freshwater. Th e Synodontis fossil record covers the last 18 Myr and most of the Synodontis fossil bones are found in a disarticulated state. Th e identifi cation of the fossils at a specifi c level is so far impossible, because we lack an osteological study of the species. Here, we present the study of the osteology of eleven Synodontis species living in Chad: S. batensoda Rüppell, 1832, S. clarias (Linnaeus, 1758), S. courteti Pellegrin, 1906, S. eupterus Boulenger, 1901, S. fi lamentosus Boulenger, 1901, S. membranaceus (Geoff roy Saint-Hilaire, 1809), S. nigrita Valenciennes, 1840, S. ocellifer Boulenger, 1900, S. schall (Bloch & Schneider, 1801), S. sorex Günther, 1864 and S. violaceus Pellegrin, 1919. Each species is characterized based on its bony anatomy. Th e morphological variability within and between the species is discussed.