4 1. Aquaculture Production by Species This Study Includes All

Total Page:16

File Type:pdf, Size:1020Kb

4 1. Aquaculture Production by Species This Study Includes All 1. Aquaculture production by species This study includes all European countries without the successor states of the former Soviet Union (Map 1). The study covers the following entities: Albania, Andorra, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Channel Islands, Croatia, Czech Republic, Denmark, Faeroe Islands, Finland, France, Germany, Greece, Holy See, Hungary, Iceland, Ireland, Isle of Man, Italy, Liechtenstein, Luxembourg, Macedonia, Malta, The Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, United Kingdom, Yugoslavia FR. Map 1 Europe The very beginning of European aquaculture is hard to determine exactly, however, it is proven that smaller ponds were constructed, or natural waters were used for fish culturing already in the Roman Empire. Accordingly the European – such as the Asian – aquaculture has more than a thousand years’ long traditions. The boom of European aquaculture started the late 19th century, and it reached its full extent during the 20th century when the technical and biological background of new technologies became available. Both in the past and present intensive and extensive methods were used simultaneously. In Central-and Eastern Europe extensive and semi-intensive pond fish culture specialised in cyprinids were characteristic, while in Northern and Southern Europe various methods (cage-, pond-, recirculation-system) of intensive marine, fresh- or brackishwater aquaculture were practised. 4 The continuously decreasing marine and freshwater fish-catches, due to rapidly declining natural fish stocks is a tendency observed both globally and in Europe, at the same time consumer demand for fish and fishery products is continuously increasing. Another tendency is the increasing population resulting in new challenges for food production both in quantity and quality. In areas of economic welfare – such as in the European Union – the quality, while at the less developed areas of the Europe the quantity is the key element. In order to permanently meet new consumer demands in fish and fishery products the development of the aquaculture industry – and increasing of its share against conventional capture fisheries – is to be emphasised. The role of recreational fisheries in aquaculture is more and more important. It is a general tendency that the development of a country and the increasing living standards result in the waning of the time spent on work and increasing the time spent recreation. People will be engaged in more hobby activities that will require new industries and services. Typical examples for this are the recreational-, and sport-fishing, already highly significant in Western Europe. This industry became especially appreciated during the past three decades as an ever increasing market for the European aquaculture through the continuous stocking of sport- fishing grounds. Beyond the recreational fish supply and food-fish production, the requirements of nature conservation (e.g. for restocking rare or endangered fish-, crayfish- and mollusc species into their original habitats) is another significant market for European aquaculture. A long-term tendency is the growing importance of recreation and nature conservation within the triple purpose of aquaculture (economic, recreational, nature conservation) with the increasing well being of a country. European aquaculture production is presented in this chapter both in terms of quantity and value, detailing the most important species groups and the current situation in the aquaculture production in each of the European countries. Summarised data1 are presented in figures and tables, while correlation and tendencies are aimed to be lined up and evaluated. This study does not cover the European successor states of the former Soviet Union (Belarus, Estonia, Latvia, Lithuania, Rep. of Moldova, Russian Federation, Ukraine). 1 The statistical data presented are primarily based on FAO, FishStat Plus 1999. 5 Aquaculture production is important to many countries of the European region because, on the one hand, it is a rather important food supply and, on the other hand, it can be a source of employment. European aquaculture production represented 4.6% of total world production in quantity and 7.5% in value in 1997 (Figure 1,2,3). 100% Oceania 90% 80% Europe 70% Africa 60% 50% Former USSR area 40% Percentage (%) America, South 30% 20% America, North 10% Asia 0% 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Figure 1 Distribution of aquaculture production volume by continent Reference: FAO, FishStat Plus 1999 100% Oceania 90% 80% Europe 70% Africa 60% 50% Former USSR area 40% Percentage (%) America South 30% 20% America, North 10% Asia 0% 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Figure 2 Distribution of aquaculture production value by continent Reference: FAO, FishStat Plus 1999 6 Quantity Value 13 12 11 10 9 8 7 6 5 Percentage (%) 4 3 2 1 0 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Figure 3 Share of European aquaculture production volume and value from total world aquaculture production Reference: FAO, FishStat Plus 1999 The share of European aquaculture from the World aquaculture production is continuously decreasing since 1984 (Figure 1, 2 and 3), while it grew in absolute terms. The reason for this is the difference in growth rates of European and the World aquaculture (in which the Asian production is significant). During the ten-year period from 1988 to 1997, aquaculture production in Europe increased from 11.5 million tons to 16.5 million tons (Table 1, Figure 5). The share of aquaculture from the total aquatic production is increasing in Europe throughout the 1980’s and also in the late 1990’s (Figure 4). Table 1 Total aquaculture production in Europe2 Quantity (1000 tons), Value (million US$) 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Quantity 1 150.5 1 171.2 1 234.0 1 227.8 1 189.1 1 195.5 1 342.4 1 486.0 1 592.0 1 655.3 Value 2 618.4 2 837.4 3 240.7 3 174.5 3 255.5 3 038.6 3 484.9 3 739.9 3 612.6 3 800.3 Reference: FAO, FishStat Plus 1999 2 Excluding the former USSR. 7 Share of aquaculture from total aquatic production Linear regression 14 y = 0,3131x + 7,0138 12 2 R = 0,843 10 8 6 Percentage (%) 4 2 0 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Figure 4 Contribution of aquaculture production volume to total aquatic production in Europe Reference: FAO, FishStat Plus 1999 1800 4000 Quantity 1600 Value 3500 Linear regression 1400 y = 47,601x + 881,13 2 3000 R = 0,8789 1200 2500 1000 2000 800 1500 Value (million US$) Value Quantity (1000 tons) 600 1000 400 200 500 0 0 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Figure 5 Growth of aquaculture production in Europe Reference: FAO, FishStat Plus 1999 8 According to the linear trend function shown in Figure 5 European aquaculture production will reach 1.8 million metric tons in five years (by 2002). If the 14 years’ data are examined it is seen that the European aquaculture production was increasing annually (save the years 1991-93). The slow growth of the aquaculture sector within the region, especially between the late 1980’s and the early 1990’s, was due to several factors, including the political and economic transition (shift from centralised to market economy) in Central and Eastern European countries and the consequent decline in carp production, the drastic fall in mussel production in Spain due the increasing occurrence of red tides, and to a lesser extent due to the progressive saturation of the mollusc markets in the region. Value of aquaculture production is growing much faster than its quantity, and this is especially so in the late 80’s. This dynamic growth is explained by increasing prices. In Figure 6 the change in price-level of a theoretical ‘average aquaculture product’ is shown, this is obtained by dividing the production value (US$) with the volume (kg). It can be clearly seen that the value was 1.5 US$/kg in the mid 80’s, and exceeded 2.5 US$/kg by the early 90’s. The peek has been reached in 1992 (2.74 US$/kg) afterwards the price decreased year by year, and dropped below 2.5 US$/kg in 1996. According to the trend function further decrease in the price-level of aquaculture products can be predicted in the coming years, down to the values similar to those of the 80’s. Naturally this does not apply to all of the products, since this is only an average indicative figure, thus the price of one product may increase while others will decrease. Price level of aquaculture product Polinom. regression 3,00 y = -0,018x2 + 0,3347x + 1,0699 R 2 = 0,9558 2,50 2,00 1,50 Price (US$/kg) 1,00 0,50 0,00 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Figure 6 Average price level of aquaculture products in Europe Reference: FAO, FishStat Plus 1999 9 In summary the volume of aquaculture production will increase, but its average value may decrease in the years to come. Individual countries contribute to the total aquaculture production to a different extent. At present the most significant producers are: Norway, France, Spain, Italy, United Kingdom, and the Netherlands. The former European socialist countries (Albania, Czech Republic, Hungary, Poland, Romania, Bulgaria, Macedonia, Croatia, Slovakia, Slovenia, Yugoslavia Fed. Rep.) represent 5% of the total European production. The share of individual countries from the total European production is shown in Figure 7-10. Spain Greece Former European United Kingdom 14 % 3 % Socialist Country 8 % 5 % Other European Country 2 % Denmark 2 % Norway Finland 23 % 1 % France 17 % The Netherlands Germany 6 % 4 % Italy Ireland Total volume: 13 % 2 % 1 655 262 metric tons Figure 7 Distribution of aquaculture production by countries in Europe (1997)3 Reference: FAO, FishStat Plus 1999 3 Former European socialist countries: Czech Republic, Hungary, Poland, Romania, Bulgaria, Macedonia, Croatia, Yugoslavia Fed.
Recommended publications
  • DNA-Based Methods for Freshwater Biodiversity Conservation
    DNA-based methods for freshwater biodiversity conservation - Phylogeographic analysis of noble crayfish (Astacus astacus) and new insights into the distribution of crayfish plague DISSERTATION zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften Fachbereich 7: Natur- und Umweltwissenschaften der Universität Koblenz-Landau Campus Landau vorgelegt am 16. Januar 2013 von Anne Schrimpf geboren am 21. September 1984 in Frankfurt am Main Referent: Prof. Dr. Ralf Schulz Koreferent: Prof. Dr. Klaus Schwenk - This thesis is dedicated to my grandparents - Content CONTENT CONTENT ............................................................................................................... 5 ABSTRACT ............................................................................................................ 8 ZUSAMMENFASSUNG ........................................................................................ 10 ABBEREVIATIONS .............................................................................................. 13 GENERAL INTRODUCTION ................................................................................ 15 Conservation of biological diversity ........................................................................ 15 The freshwater crayfish ............................................................................................ 17 General ............................................................................................................... 17 The noble crayfish (Astacus astacus) ................................................................
    [Show full text]
  • Ripiro Beach
    http://researchcommons.waikato.ac.nz/ Research Commons at the University of Waikato Copyright Statement: The digital copy of this thesis is protected by the Copyright Act 1994 (New Zealand). The thesis may be consulted by you, provided you comply with the provisions of the Act and the following conditions of use: Any use you make of these documents or images must be for research or private study purposes only, and you may not make them available to any other person. Authors control the copyright of their thesis. You will recognise the author’s right to be identified as the author of the thesis, and due acknowledgement will be made to the author where appropriate. You will obtain the author’s permission before publishing any material from the thesis. The modification of toheroa habitat by streams on Ripiro Beach A thesis submitted in partial fulfilment of the requirements for the degree of Master of Science (Research) in Environmental Science at The University of Waikato by JANE COPE 2018 ―We leave something of ourselves behind when we leave a place, we stay there, even though we go away. And there are things in us that we can find again only by going back there‖ – Pascal Mercier, Night train to London i Abstract Habitat modification and loss are key factors driving the global extinction and displacement of species. The scale and consequences of habitat loss are relatively well understood in terrestrial environments, but in marine ecosystems, and particularly soft sediment ecosystems, this is not the case. The characteristics which determine the suitability of soft sediment habitats are often subtle, due to the apparent homogeneity of sandy environments.
    [Show full text]
  • Crustacea-Arthropoda) Fauna of Sinop and Samsun and Their Ecology
    J. Black Sea/Mediterranean Environment Vol. 15: 47- 60 (2009) Freshwater and brackish water Malacostraca (Crustacea-Arthropoda) fauna of Sinop and Samsun and their ecology Sinop ve Samsun illeri tatlısu ve acısu Malacostraca (Crustacea-Arthropoda) faunası ve ekolojileri Mehmet Akbulut1*, M. Ruşen Ustaoğlu2, Ekrem Şanver Çelik1 1 Çanakkale Onsekiz Mart University, Fisheries Faculty, Çanakkale-Turkey 2 Ege University, Fisheries Faculty, Izmir-Turkey Abstract Malacostraca fauna collected from freshwater and brackishwater in Sinop and Samsun were studied from 181 stations between February 1999 and September 2000. 19 species and 4 subspecies belonging to 15 genuses were found in 134 stations. In total, 23 taxon were found: 11 Amphipoda, 6 Decapoda, 4 Isopoda, and 2 Mysidacea. Limnomysis benedeni is the first time in Turkish Mysidacea fauna. In this work at the first time recorded group are Gammarus pulex pulex, Gammarus aequicauda, Gammarus uludagi, Gammarus komareki, Gammarus longipedis, Gammarus balcanicus, Echinogammarus ischnus, Orchestia stephenseni Paramysis kosswigi, Idotea baltica basteri, Idotea hectica, Sphaeroma serratum, Palaemon adspersus, Crangon crangon, Potamon ibericum tauricum and Carcinus aestuarii in the studied area. Potamon ibericum tauricum is the most encountered and widespread species. Key words: Freshwater, brackish water, Malacostraca, Sinop, Samsun, Turkey Introduction The Malacostraca is the largest subgroup of crustaceans and includes the decapods such as crabs, mole crabs, lobsters, true shrimps and the stomatopods or mantis shrimps. There are more than 22,000 taxa in this group representing two third of all crustacean species and contains all the larger forms. *Corresponding author: [email protected] 47 Malacostracans play an important role in aquatic ecosystems and therefore their conservation is important.
    [Show full text]
  • Crayfish News  Volume 32 Issue 1-2: Page 1
    June 2010 Volume 32, Issue 1-2 ISSN: 1023-8174 (print), 2150-9239 (online) The Official Newsletter of the International Association of Astacology Inside this issue: Cover Story 1 Searching for Crayfish in the President’s Corner 2 River Bug, Ukraine Info About IAA18 3 Future Directions 4 Symposium Info Short Articles 6 Male Form 6 Alternation in Spinycheek Crayfish, Orconectes limosus, at Cessy (East-central France): The Discovery of Anomalous Form Males IAA Related News 10 News Items From 11 Around the World Meeting 13 Announcements Literature of 16 Interest to Astacologists Figure 1. Astacus leptodactylus from the River Bug, Ukraine. comparison with other species, information n official opportunity for the author on A. pachypus is very limited (Souty-Grosset A to travel to the Ukraine was the 2nd et al., 2006). Since no specimens were meeting of the signatories to the available to be photographed for the “Memorandum of Understanding (MoU) on identification guide of crayfish species in the Conservation and Management of the Europe (Pöckl et al., 2006), only a sketch was middle European population of the Great presented. Bustard (Otis tarda)” under the “Convention Feodosia, located on the Crimean of Migratory Species of Wild Animals” (CMS th Peninsula, is not easily reached by airplane, or Bonn Convention) from November 8-12 with the nearest airport being in Simferopol. 2008. There are no direct flights to this region from The author has always dreamed of most European capitals, with connecting visiting the Ukraine in order to collect flights running through Kiev, Moscow or specimens of the thick-clawed crayfish, Istanbul.
    [Show full text]
  • The Catalogue of the Freshwater Crayfish (Crustacea: Decapoda: Astacidae) from Romania Preserved in “Grigore Antipa” National Museum of Natural History of Bucharest
    Travaux du Muséum National d’Histoire Naturelle © Décembre Vol. LIII pp. 115–123 «Grigore Antipa» 2010 DOI: 10.2478/v10191-010-0008-5 THE CATALOGUE OF THE FRESHWATER CRAYFISH (CRUSTACEA: DECAPODA: ASTACIDAE) FROM ROMANIA PRESERVED IN “GRIGORE ANTIPA” NATIONAL MUSEUM OF NATURAL HISTORY OF BUCHAREST IORGU PETRESCU, ANA-MARIA PETRESCU Abstract. The largest collection of freshwater crayfish of Romania is preserved in “Grigore Antipa” National Museum of Natural History of Bucharest. The collection consists of 426 specimens of Astacus astacus, A. leptodactylus and Austropotamobius torrentium. Résumé. La plus grande collection d’écrevisses de Roumanie se trouve au Muséum National d’Histoire Naturelle «Grigore Antipa» de Bucarest. Elle comprend 426 exemplaires appartenant à deux genres et trois espèces, Astacus astacus, A. leptodactylus et Austropotamobius torrentium. Key words: Astacidae, Romania, museum collection, catalogue. INTRODUCTION The first paper dealing with the freshwater crayfish of Romania is that of Cosmovici, published in 1901 (Bãcescu, 1967) in which it is about the freshwater crayfish from the surroundings of Iaºi. The second one, much complex, is that of Scriban (1908), who reports Austropotamobius torrentium for the first time, from Racovãþ, Bahna basin (Mehedinþi county). Also Scriban made the first comment on the morphology and distribution of the species Astacus astacus, A. leptodactylus and Austropotamobius torrentium, mentioning their distinctive features. Also, he published the first drawings of these species (cephalothorax). Entz (1912) dedicated a large study to the crayfish of Hungary, where data on the crayfish of Transylvania are included. Probably it is the amplest paper dedicated to the crayfish of the Romanian fauna from the beginning of the last century, with numerous data on the outer morphology, distinctive features between species, with more detailed figures and with the very first morphometric measures, and also with much detailed data on the distribution in Transylvania.
    [Show full text]
  • Ostrea Angasi) Farming Industry in New South Wales
    Paving the way for continued rapid development of the flat (angasi) oyster (Ostrea angasi) farming industry in New South Wales Mike Heasman1, Ben K. Diggles2, David Hurwood3, Peter Mather3, Igor Pirozzi1 and Symon Dworjanyn1 1NSW Fisheries Port Stephens Fisheries Centre Private Bag 1 Nelson Bay NSW 2315 2NIWA Australia Pty Ltd PO Box 359 Wilston Qld 4051 3School of Natural Resource Sciences Queensland University of Technology GPO Box 2434 Brisbane Qld 4001 Final Report to the Department of Transport & Regional Services Project No. NT002/0195 June 2004 NSW Fisheries Final Report Series No. 66 ISSN 1440-3544 Paving the way for continued rapid development of the flat (angasi) oyster (Ostrea angasi) farming industry in New South Wales Mike Heasman1, Ben K. Diggles2, David Hurwood3, Peter Mather3, Igor Pirozzi1 and Symon Dworjanyn1 1NSW Fisheries Port Stephens Fisheries Centre Private Bag 1 Nelson Bay NSW 2315 2NIWA Australia Pty Ltd PO Box 359 Wilston Qld 4051 3School of Natural Resource Sciences Queensland University of Technology GPO Box 2434 Brisbane Qld 4001 Final Report to the Department of Transport & Regional Services Project No. NT002/0195 June 2004 NSW Fisheries Final Report Series No.66 ISSN 1440-3544 Paving the way for continued rapid development of the flat (angasi) oyster (Ostrea angasi) farming in NSW June 2004 Authors: Michael P. Heasman, Ben K. Diggles, David Hurwood and Peter Mather, Igor Pirozzi and Symon Dworjanyn Published By: NSW Fisheries Postal Address: Private Bag 1, Nelson Bay NSW 2315 Internet: www.fisheries.nsw.gov.au NSW Fisheries and the Department of Transport & Regional Services This work is copyright.
    [Show full text]
  • Estimating the Population Size of Astacus Leptodactylus (Decapoda: Astacidae) by Mark-Recapture Technique in E₣Irdir Lake, Turkey
    African Journal of Biotechnology Vol. 10(55), pp. 11778-11783, 21 September, 2011 Available online at http://www.academicjournals.org/AJB DOI: 10.5897/AJB11.758 ISSN 1684–5315 © 2011 Academic Journals Full Length Research Paper Estimating the population size of Astacus leptodactylus (Decapoda: Astacidae) by mark-recapture technique in Eirdir lake, Turkey Yildiz Bolat1*, Yavuz Mazlum2, Aydin Demirci2 and Habil Uur Koca1 1Departmant of Fishing and Fish Processing Technology, Faculty of Fisheries, University of Süleyman Demirel, 32500 Eirdir, Isparta, Turkey. 2Faculty of Fisheries, Mustafa Kemal University, TR-31200 Iskenderun-Hatay, Turkey. Accepted 13 June, 2011 The mark-recapture technique for closed populations was employed to estimate the population size and density of Astacus leptodactylus during August and September, 2005 by using minnow traps of 34 mm mesh size in Eirdir Lake. A total of 600 minnow traps were set randomly along the shoreline at approximately 3, 5 and 7 m depth. The nets were set in the late afternoon to each study depths, and were hauled the next day or after two days. The research was performed two times each month. In August, 1956 adult crayfish and in September, 2756 adult crayfish were marked by cauterization of the carapace. The recapture rates were found to be 3.5% in August and 2.3% in September, respectively. A total of 200 crayfish were randomly selected, 74 females and 126 males. The sex ratio was 1:1.7. Moreover, length and weight data gotten from 200 untagged crayfish showed that females and males differed significantly in their weight, but no significant difference was evident in the carapace length.
    [Show full text]
  • A Regional Shellfish Hatchery for the Wider Caribbean Assessing Its Feasibility and Sustainability
    FAO ISSN 2070-6103 19 FISHERIES AND AQUACULTURE PROCEEDINGS FAO FISHERIES AND AQUACULTURE PROCEEDINGS 19 19 A regional shellfish hatchery for the Wider Caribbean Assessing its feasibility and sustainability A regional shellfish hatchery for the Wider Caribbean – Assessing its feasibility and sustainability A regional FAO Regional Technical Workshop A regional shellfish hatchery for 18–21 October 2010 Kingston, Jamaica the Wider Caribbean It is widely recognized that the development of aquaculture in Assessing its feasibility and sustainability the Wider Caribbean Region is inhibited, in part, by the lack of technical expertise, infrastructure, capital investment and human resources. Furthermore, seed supply for native species FAO Regional Technical Workshop relies, for the most part, on natural collection, subject to 18–21 October 2010 natural population abundance with wide yearly variations. This Kingston, Jamaica situation has led to the current trend of culturing more readily available exotic species, but with a potentially undesirable impact on the natural environment. The centralizing of resources available in the region into a shared facility has been recommended by several expert meetings over the past 20 years. The establishment of a regional hatchery facility, supporting sustainable aquaculture through the seed production of native molluscan species was discussed at the FAO workshop “Regional shellfish hatchery: A feasibility study” held in Kingston, Jamaica, in October 2010, by representatives of Caribbean Governments and experts in the field. Molluscan species are particularly targeted due to their culture potential in terms of known techniques, simple grow-out technology and low impact on surrounding environment. It is proposed that a regional molluscan hatchery would produce seed for sale and distribution to grow-out operations in the region as well as provide technical support for the research on new species.
    [Show full text]
  • Panopea Abrupta ) Ecology and Aquaculture Production
    COMPREHENSIVE LITERATURE REVIEW AND SYNOPSIS OF ISSUES RELATING TO GEODUCK ( PANOPEA ABRUPTA ) ECOLOGY AND AQUACULTURE PRODUCTION Prepared for Washington State Department of Natural Resources by Kristine Feldman, Brent Vadopalas, David Armstrong, Carolyn Friedman, Ray Hilborn, Kerry Naish, Jose Orensanz, and Juan Valero (School of Aquatic and Fishery Sciences, University of Washington), Jennifer Ruesink (Department of Biology, University of Washington), Andrew Suhrbier, Aimee Christy, and Dan Cheney (Pacific Shellfish Institute), and Jonathan P. Davis (Baywater Inc.) February 6, 2004 TABLE OF CONTENTS LIST OF FIGURES ........................................................................................................... iv LIST OF TABLES...............................................................................................................v 1. EXECUTIVE SUMMARY ....................................................................................... 1 1.1 General life history ..................................................................................... 1 1.2 Predator-prey interactions........................................................................... 2 1.3 Community and ecosystem effects of geoducks......................................... 2 1.4 Spatial structure of geoduck populations.................................................... 3 1.5 Genetic-based differences at the population level ...................................... 3 1.6 Commercial geoduck hatchery practices ...................................................
    [Show full text]
  • Georgiev 2006.Pdf
    IUCN Otter Spec. Group Bull. 23(1) 2006 IUCN OTTER SPECIALIST GROUP BULLETIN VOLUME 23 ISSUE 1 PAGES 4 - 10 Citation: Georgiev, D.G. (2006) Diet of the Otter Lutra lutra in Different Habitats of South-Eastern Bulgaria IUCN Otter Spec. Group Bull. 23 (1): 4 - 10 DIET OF THE OTTER Lutra Lutra IN DIFFERENT HABITATS OF SOUTH- EASTERN BULGARIA Dilian G. GEORGIEV Department of Ecology and Environmental conservation, University of Plovdiv, Tzar Assen Str. 24, BG-4000 Plovdiv, Bulgaria e-mail: [email protected], [email protected] (received 12th April 2006, accepted 14th June 2004) Abstract: The study was carried out in three geographic regions of south-eastern Bulgaria with similar conditions: Upper Thracian Valley, Kazanlashka Valley, Surnena Sredna Gora Mountain and Black Sea Coast. The material was collected between 29.02.2005 – 21.03.2006 from various habitats. A total of 78 species were registered in the otter diet, and 65 of them were new records for Bulgaria. Following this study, a total of 101 different species of prey are known in this country. The main food source of the otter was found to be fish (Carassius auratus gibelio, C. carassius, Perca fluviatilis, Lepomis gibbosus, Barbus cyclolepis), but in rivers marsh frogs (Rana ridibunda) and freshwater crabs (Potamon ibericum) were also dominant prey. The main food source species and the trophic niche breadth of the otter in the region studied varied through the seasons and according to different habitats. Keywords: otter, Lutra lutra, diet, habitats, Bulgaria. INTRODUCTION The diet of the otter in Bulgaria was poorly known. Until now (GEORGIEV, 2004) 36 food components were reported: 2 species of molluscs (Mollusca: Bivalvia), 5 species of crustaceans (Crustacea), 4 species of insects (Insecta), 9 fish species (Pisces), 2 amphibian species (Amphibia: Anura), 3 species of reptiles (Reptilia: Serpentes, Chelonia), 4 bird species (Aves), 2 species of mammals, one of them eaten as a carcass (Mammalia), fruits from 4 plant species and garbage.
    [Show full text]
  • Farming Bivalve Molluscs: Methods for Study and Development by D
    Advances in World Aquaculture, Volume 1 Managing Editor, Paul A. Sandifer Farming Bivalve Molluscs: Methods for Study and Development by D. B. Quayle Department of Fisheries and Oceans Fisheries Research Branch Pacific Biological Station Nanaimo, British Columbia V9R 5K6 Canada and G. F. Newkirk Department of Biology Dalhousie University Halifax, Nova Scotia B3H 471 Canada Published by THE WORLD AQUACULTURE SOCIETY in association with THE INTERNATIONAL DEVELOPMENT RESEARCH CENTRE The World Aquaculture Society 16 East Fraternity Lane Louisiana State University Baton Rouge, LA 70803 Copyright 1989 by INTERNATIONAL DEVELOPMENT RESEARCH CENTRE, Canada All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher, The World Aquaculture Society, 16 E. Fraternity Lane, Louisiana State University, Baton Rouge, LA 70803 and the International Development Research Centre, 250 Albert St., P.O. Box 8500, Ottawa, Canada K1G 3H9. ; t" ary of Congress Catalog Number: 89-40570 tI"624529-0-4 t t lq 7 i ACKNOWLEDGMENTS The following figures are reproduced with permission: Figures 1- 10, 12, 13, 17,20,22,23, 32, 35, 37, 42, 45, 48, 50 - 54, 62, 64, 72, 75, 86, and 87 from the Fisheries Board of Canada; Figures 11 and 21 from the United States Government Printing Office; Figure 15 from the Buckland Founda- tion; Figures 18, 19,24 - 28, 33, 34, 38, 41, 56, and 65 from the International Development Research Centre; Figures 29 and 30 from the Journal of Shellfish Research; and Figure 43 from Fritz (1982).
    [Show full text]
  • Integrating the Aquaculture of the Green Sea Urchin Strongylocentrotus Droebachiensis and the European Oyster Ostrea Edulis in the Gulf of Maine (4.25.2014)
    Integrating the Aquaculture of the green sea urchin Strongylocentrotus droebachiensis and the European oyster Ostrea edulis in the Gulf of Maine (4.25.2014) Investigators: Advisor: ____________ Daniel Tauriello Dr. Larry G. Harris Dulaney Miller Britton Beal Michael Quinlan Abstract The concept of integrated multi-trophic aquaculture is a growing trend in aquaculture systems design. It involves cultivating multiple species with complementary ecological requirements, so that all components have commercial value, as well as roles in biomitigation. This project aimed to apply the concept of multi-trophic integration to the culture of European oysters and green sea urchins. The European Oyster (Ostrea edulis) was introduced to the Gulf of Maine in the 1940’s as a compliment to the American oyster (Crassostrea virginica). Wild populations are becoming highly conspicuous in the coastal zone, as its habitat does not overlap with C. virginica; an estuarine species. No aquaculture operations currently utilize this species. A fishery for the green sea urchin (Strongylocentrotus droebachiensis) was initiated in the Gulf of Maine in 1987, and quickly overfished. Populations show limited signs of recovery although the demand for urchin roe is high. An innovative caging system for integrated culture of S. drobachiensis and O. edulis was developed and tested at a field site in Little Harbor, a part of Portsmouth Harbor, New Hampshire. The system was determined to be robust and potentially scalable for commercial culture. Free-roaming S. droebachiensis were observed to be attracted to the caging structure. Preliminary testing occurred at a study site in Gosport Harbor, NH. S. droebachiensis was found to perform as a highly effective agent in bio-fouling mitigation.
    [Show full text]