Divovich-Et-Al-Russia-Black-Sea.Pdf
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Parasite Communities and Feeding Ecology of the European Sprat (Sprattus Sprattus L.) Over Its Range of Distribution
Parasitol Res (2012) 110:1147–1157 DOI 10.1007/s00436-011-2605-z ORIGINAL PAPER Parasite communities and feeding ecology of the European sprat (Sprattus sprattus L.) over its range of distribution Sonja Kleinertz & Sven Klimpel & Harry W. Palm Received: 15 July 2011 /Accepted: 4 August 2011 /Published online: 18 August 2011 # Springer-Verlag 2011 Abstract The metazoan parasite fauna and feeding ecology Mollusca, Annelida, Crustacea and Tunicata. The highest of 165 Sprattus sprattus (L., 1758) was studied from number of prey organisms belonged to the crustaceans. The different geographic regions (Baltic Sea, North Sea, English variety of prey items in the stomach was reflected by the Channel, Bay of Biscay, Mediterranean Sea). A total of 13 parasite community differences and parasite species rich- metazoan parasite species were identified including six ness from the different regions. The feeding ecology of the Digenea, one Monogenea, two Cestoda, two Nematoda fish at the sampled localities was responsible for the and two Crustacea. Didymozoidae indet., Lecithocladium observed parasite composition and, secondarily, the zoo- excisum and Bomolochidae indet. represent new host geographical distribution of the parasites, questioning the records. The parasite species richness differed according use of the recorded sprat parasites as biological indicators to regions and ranged between 3 and 10. The most species- for environmental conditions and change. rich parasite fauna was recorded for sprats from the Bay of Biscay (North Atlantic), and the fishes from the Baltic Sea contained the lowest number of parasite species. More Introduction closely connected geographical regions, the North Sea, English Channel and Bay of Biscay, showed more similar Fish parasites are an integral part of every ecosystem and parasite component communities compared with more play an important role for the health of marine organisms. -
On Bycatch Or How W.H.L. Allsopp Coined a New Word and Created
On bycatch s s s s s or How W.H.L. Allsopp coined a new word and created new insights U U U U U by Daniel Pauly n old friend of mine, slightly edited, was as When a trawling survey, and often a role follows: conducted off Guyana in Amodel, Dr. W.H.L. 1957, found large resources ‘Bertie’ Allsopp recently “The use of the term of penaeid prawns, the turned 80, and wrote me ‘bycatch’ originated in situation became much d d d d d that at the celebration, his British Guiana in 1950 when worse. Soon, over 200 US, brother, the author of the I was first shown the large Japanese, and other Guyana- Oxford Dictionary of discards of catfishes (which based trawlers started Caribbean English Usage were called ‘skinfish’), jettisoned their bycatch. n n n n n (Allsopp 1996) asked him caught incidentally by local However, the FAO declined for a reference attesting the fishermen in their nets and to help. They hired me, earliest introduction of the abandoned as however, to work for them in word ‘bycatch’. Bertie, who unmarketable. We started, West Africa from a base in was for many years a senior from 1950-1955, an ‘Eat- Togo. There, I saw the same official at the Canadian More-Skinfish Campaign’ pattern of discarding by International Development with the full participation of shrimp trawlers, again Research Centre (IDRC; the Governor and other considered by FAO a normal ou ou high colonial officials, fish- industrial practice. ou Allsopp 1989) provided me ou ou with the background in two feasts on St Peter’s day, e-mails, whose substance, recipe book, calypsos, etc. -
Shifting Baseline Syndrome: Causes, Consequences, and Implications
REVIEWS REVIEWS REVIEWS 222 Shifting baseline syndrome: causes, consequences, and implications Masashi Soga1* and Kevin J Gaston2 With ongoing environmental degradation at local, regional, and global scales, people’s accepted thresholds for environmental conditions are continually being lowered. In the absence of past information or experience with historical conditions, members of each new generation accept the situation in which they were raised as being normal. This psychological and sociological phenomenon is termed shifting baseline syndrome (SBS), which is increasingly recognized as one of the fundamental obstacles to addressing a wide range of today’s global environmental issues. Yet our understanding of this phenomenon remains incomplete. We provide an overview of the nature and extent of SBS and propose a conceptual framework for understanding its causes, consequences, and implications. We suggest that there are several self- reinforcing feedback loops that allow the consequences of SBS to further accelerate SBS through progressive environmental degradation. Such negative implications highlight the urgent need to dedicate considerable effort to preventing and ultimately reversing SBS. Front Ecol Environ 2018; 16(4): 222–230, doi: 10.1002/fee.1794 he magnitude, rate, and extent of the changes that Daniel Pauly elucidated the concept of “shifting base- Thumans have made to the Earth’s natural environ- line syndrome” (SBS) in a seminal essay that placed it in a ment are hard to grasp. Quantitative estimates abound. fisheries context (Pauly 1995). He pointed out that fishers For instance, over the past several decades, almost one- and marine scientists tend to perceive faunal composition quarter of all primary production has been appropriated and stock sizes at the beginning of their careers as the for human consumption (Haberl et al. -
Reproductive Cycle of Aplodinotus Grunniens Females (Rafinesque, 1819) in the Usumacinta River, Mexico
Latin American Journal of Aquatic Research, 47(4Reproductive): 612-625, cycle2019 of Aplodinotus grunniens females 1 DOI: 10.3856/vol47-issue4-fulltext-4 Research Articles Reproductive cycle of Aplodinotus grunniens females (Rafinesque, 1819) in the Usumacinta River, Mexico Raúl E. Hernández-Gómez1, Wilfrido M. Contreras-Sánchez2, Arlette A. Hernández-Franyutti2 Martha A. Perera-García3 & Aarón Torres-Martínez2 1División Académica Multidisciplinaria de los Ríos, Universidad Juárez Autónoma de Tabasco Tabasco, México 2División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco Villahermosa-Cárdenas, Tabasco, México 3División Académica de Ciencias Agropecuarias, Tabasco, México Corresponding author: Wilfrido M. Contreras-Sánchez ([email protected]) ABSTRACT. The freshwater drum Aplodinotus grunniens is a species widely distributed in North America. In the Mexican southeast, this species occurs in the Usumacinta River, where it supports an artisanal fishery. In this regard, the present study was conducted to supply detailed information on the female reproductive cycle of this species. Calculations of gonadosomatic (GSI) and hepatosomatic (HSI) indexes, histological and visual staging of ovaries as well as the staging of oocyte development were applied together to determine the reproductive changes during an annual cycle. The histological analysis revealed the presence of spawning capable females throughout the year, and the distribution frequencies of oocyte diameters displayed the continuous occurrence of mature -
In the Kattegat and Skagerrak, Eastern North Sea
Aquat. Living Resour. 28, 127–137 (2015) Aquatic c EDP Sciences 2016 DOI: 10.1051/alr/2016007 Living www.alr-journal.org Resources Growth and maturity of sprat (Sprattus sprattus) in the Kattegat and Skagerrak, eastern North Sea Francesca Vitale1, Felix Mittermayer1,2, Birgitta Krischansson1, Marianne Johansson1 and Michele Casini1,a 1 Swedish University of Agricultural Sciences, Department of Aquatic Resources, Institute of Marine Research, 45330 Lysekil, Sweden 2 GEOMAR Helmholtz Centre for Ocean Research, Evolutionary Ecology of Marine Fishes, 24105 Kiel, Germany Received 13 July 2015; Accepted 12 February 2016 Abstract – Information on fish biology, as growth and reproduction, is an essential first step for a sound assessment and management of a fishery resource. Here we analyzed the annual cycle of body condition factor (K), gonadosomatic index (GSI) and maturity of sprat from the Skagerrak and Kattegat as well as from the Skagerrak inner fjords (Uddevalla fjords). The results show an inverse yearly pattern for K and GSI in both areas, K being the highest in autumn and lowest in spring, while the GSI index was highest in spring and lowest in autumn. The annual highest proportion of spawning fish was recorded from May to July, indicating the late spring and early summer as the main spawning period for sprat in these areas. Male sprat reached maturity at a higher size in the Uddevalla fjords compared to Skagerrak and Kattegat, while negligible differences were shown by females. The K, GSI and size-at-age were the lowest in the Uddevalla fjords, while K and GSI were the highest in the Skagerrak, potentially related to the different environmental conditions encountered in the different areas. -
IATTC-94-01 the Tuna Fishery, Stocks, and Ecosystem in the Eastern
INTER-AMERICAN TROPICAL TUNA COMMISSION 94TH MEETING Bilbao, Spain 22-26 July 2019 DOCUMENT IATTC-94-01 REPORT ON THE TUNA FISHERY, STOCKS, AND ECOSYSTEM IN THE EASTERN PACIFIC OCEAN IN 2018 A. The fishery for tunas and billfishes in the eastern Pacific Ocean ....................................................... 3 B. Yellowfin tuna ................................................................................................................................... 50 C. Skipjack tuna ..................................................................................................................................... 58 D. Bigeye tuna ........................................................................................................................................ 64 E. Pacific bluefin tuna ............................................................................................................................ 72 F. Albacore tuna .................................................................................................................................... 76 G. Swordfish ........................................................................................................................................... 82 H. Blue marlin ........................................................................................................................................ 85 I. Striped marlin .................................................................................................................................... 86 J. Sailfish -
Spawning of Bluefin Tuna in the Black Sea: Historical Evidence, Environmental Constraints and Population Plasticity
CORE Downloaded from orbit.dtu.dk on: Dec 20, 2017 Metadata, citation and similar papers at core.ac.uk Provided by Online Research Database In Technology Spawning of bluefin tuna in the black sea: historical evidence, environmental constraints and population plasticity MacKenzie, Brian; Mariani, Patrizio Published in: PLoS ONE Link to article, DOI: 10.1371/journal.pone.0039998 Publication date: 2012 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Mackenzie, B. R., & Mariani, P. (2012). Spawning of bluefin tuna in the black sea: historical evidence, environmental constraints and population plasticity. PLoS ONE, 7(7), e39998. DOI: 10.1371/journal.pone.0039998 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Spawning of Bluefin Tuna in the Black Sea: Historical Evidence, -
Changing Communities of Baltic Coastal Fish Executive Summary: Assessment of Coastal fi Sh in the Baltic Sea
Baltic Sea Environment Proceedings No. 103 B Changing Communities of Baltic Coastal Fish Executive summary: Assessment of coastal fi sh in the Baltic Sea Helsinki Commission Baltic Marine Environment Protection Commission Baltic Sea Environment Proceedings No. 103 B Changing Communities of Baltic Coastal Fish Executive summary: Assessment of coastal fi sh in the Baltic Sea Helsinki Commission Baltic Marine Environment Protection Commission Editor: Janet Pawlak Authors: Kaj Ådjers (Co-ordination Organ for Baltic Reference Areas) Jan Andersson (Swedish Board of Fisheries) Magnus Appelberg (Swedish Board of Fisheries) Redik Eschbaum (Estonian Marine Institute) Ronald Fricke (State Museum of Natural History, Stuttgart, Germany) Antti Lappalainen (Finnish Game and Fisheries Research Institute), Atis Minde (Latvian Fish Resources Agency) Henn Ojaveer (Estonian Marine Institute) Wojciech Pelczarski (Sea Fisheries Institute, Poland) Rimantas Repečka (Institute of Ecology, Lithuania). Photographers: Visa Hietalahti p. cover, 7 top, 8 bottom Johnny Jensen p. 3 top, 3 bottom, 4 middle, 4 bottom, 5 top, 8 top, 9 top, 9 bottom Lauri Urho p. 4 top, 5 bottom Juhani Vaittinen p. 7 bottom Markku Varjo / LKA p. 10 top For bibliographic purposes this document should be cited as: HELCOM, 2006 Changing Communities of Baltic Coastal Fish Executive summary: Assessment of coastal fi sh in the Baltic Sea Balt. Sea Environ. Proc. No. 103 B Information included in this publication or extracts thereof is free for citing on the condition that the complete reference of the publication is given as stated above Copyright 2006 by the Baltic Marine Environment Protection Commission - Helsinki Commission - Design and layout: Bitdesign, Vantaa, Finland Printed by: Erweko Painotuote Oy, Finland ISSN 0357-2994 Coastal fi sh – a combination of freshwater and marine species Coastal fish communities are important components of Baltic Sea ecosystems. -
Download Online Through the Principles of Open Access
CHAPTER 1: General Introduction. Objectives. Outline of the thesis Chapter 1 - Introduction CHAPTER 1. GENERAL INTRODUCTION, OBJECTIVES, OUTLINE OF THE THESIS 1 .1 H e a l t h y a n d P r o d u c t iv e S ea s a n d O c e a n s 1 .1 .1 In t e g r a t e d p o lic ies a n d e c o s y s t e m - b a s ed m a n a g e m e n t The results of large scale assessments indicate that overexploitation of resources and changes in habitats are the main causes for the continued rates of loss of biological diversity (MEA 2005, EEA 2009), and that coastal and marine areas face particularly high impacts (OSPAR 2010). It is estimated that marine ecosystems provide two thirds of the value generated by ecosystems globally (Costanza et al. 1997). In terms of food production only, 128 million tonnes (t) of fish products are the primary source of protein for 17% of the world's population and nearly 25% in low-income or food-deficit countries (FAO 2012). The livelihoods of 12% of the world's population depend directly or indirectly on fisheries and aquaculture in marine waters and coastal zones. However, these ecosystems have traditionally been considered as infinite (Daly 1992) and for similar reasons, the concept of internalisation of environmental costs and the restoration and management of degraded ecosystems and resources have been scarcely applied in the marine environment. -
Zoogeography of Digenetic Trematodes from West African Marine Fishes1
192 PROCEEDINGS OF THE HELMINTHOLOGICAL SOCIETY Zoogeography of Digenetic Trematodes from West African Marine Fishes1 JACOB H. FISCHTHAL Department of Biological Sciences, State University of New York at Binghamton, Binghamton, New York 13901. ABSTRACT: Of the 107 species of trematodes found in West African (Mauritania to Gabon) marine fishes, 100 are allocated to 64 genera in 24 families while seven are immature didymozoids. Many of these genera are located in most of the world's seas with the exception of the polar seas; only five are en- demic to West Africa. The data for the 41 species known from West Africa and elsewhere, and those morphologically closest to the 55 endemic species, indicate that they are very widely distributed, particularly in the Western and North Atlantic, and Mediterranean. Historical and present- day events concerning physical and biological environmental factors and their effects on actual and po- tential hosts as well as on life cycle stages of the trematodes have resulted in the geographical distribution reported. The distribution of marine fishes has been emphasized to explain in part the trematode distribu- tion. Studies on the geographical distribution of (Gulf of Guinea from 5° S to 15° N) and digenetic trematodes of marine fishes in various warm temperate Mauritania have been pre- seas have been presented by Manter (1955, sented by Ekman (1953), Buchanan (1958), 1963, 1967), Szidat (1961), and Lebedev Longhurst (1962), and Ingham (1970). (1969), but West African waters were not included as sufficient data were not available Zoogeographical Distribution until more recently. The digenetic trematodes Of the 107 species of trematodes found in of West African marine fishes (mainly shore West African fishes, 100 are allocated to 64 and shelf inhabitants) have been reported by genera in 24 families while seven are immature Dollfus (1929, 1937a, b, 1946, 1951, 1960), didymozoids of unknown generic status (Ap- Dollfus and Capron (1958), Thomas (1959, pendix I). -
Weight Relationships of F1 Hybrid Juveniles (Umbrina Cirrosa Χ Argyrosomus Regius
http://www.egejfas.org Su Ürünleri Dergisi (2017) Ege Journal of Fisheries and Aquatic Sciences, 34(3): 287-291 (2017) DOI: 10.12714/egejfas.2017.34.3.07 RESEARCH ARTICLE ARAŞTIRMA MAKALESİ Some morphometric features and length - weight relationships of F1 hybrid juveniles (Umbrina cirrosa ♀ Χ Argyrosomus regius ♂) F1 juvenil hibritleri (Umbrina cirrosa ♀ Χ Argyrosomus regius ♂)’nin bazı morfolojik özellikleri ve boy- ağırlık ilişkileri Şule Gürkan1* ● Kutsal Gamsız2 ● Bilge Karahan2 ● Emel Özcan Gökçek2 1 Ege University Faculty of Fisheries Dep.of Hydrobiology, 35100 Bornova İzmir, Turkey 2 Ege University Faculty of Fisheries Dep.of Aquaculture, 35100 Bornova İzmir, Turkey * Corresponding author: [email protected] Received date: 02.01.2017 Accepted date: 05.06.2017 How to cite this paper: Gürkan, Ş., Gamsız, K., Karahan, B. & Özcan Gökçek, E. (2017). Some morphometric features and length - weight relationships of F1 hybrid juveniles (Umbrina cirrosa ♀ Χ Argyrosomus regius ♂). Ege Journal of Fisheries and Aquatic Sciences, 34(3): 287-291. doi:10.12714/egejfas.2017.34.3.07 Abstract: In this study, length-weight relations and some morphometric characteristics of hybrid juveniles obtained by crossing of Umbrina cirrosa (Linnaeus, 1758) and Argyrosomus regius (Asso, 1801) via artificial fertilization under aquaculture conditions were investigated. Lengths, weights and condition factors of 39 hybrid juvenile specimen varied between 26.12 and 48.67 mm, 0.7 and 0.99 g, 0.81 and 1.09 respectively. Length-weight relationship (W) was calculated (0.000009 * TL3.006 r = 0.99). Individuals have shown isometric growth (b=3) according to the results of regression analyze by b value. -
Whales, Whaling, and Ocean Ecosystems
TWO Whales, Interaction Webs, and Zero-Sum Ecology ROBERT T. PAINE Food webs are inescapable consequences of any multispecies importance, is the “changing baseline” perspective (Pauly study in which interactions are assumed to exist. The nexus 1995, Jackson et al. 2001): Species abundances have changed, can be pictured as links between species (e.g., Elton 1927) or and therefore the ecological context, but by how much? as entries in a predator by prey matrix (Cohen et al. 1993). This essay begins with a brief summary of experimental Both procedures promote the view that all ecosystems are studies that identify the importance of employing interaction characterized by clusters of interacting species. Both have webs as a format for further discussion of whales and ocean encouraged compilations of increasingly complete trophic ecosystems. The concept, while not novel, was developed by descriptions and the development of quantitative theory. Paine (1980) as “functional” webs; Menge (1995) provided Neither, however, confronts the issue of what constitutes a the more appropriate term, interaction web. My motivation legitimate link (Paine 1988); neither can incorporate the con- is threefold: sequences of dynamical alteration of predator (or prey) abun- 1. Such studies convincingly demonstrate that species dances or deal effectively with trophic cascades or indirect do interact and that some subset of these interactions effects. Thus one challenge confronting contributors to this bear substantial consequences for many associated volume is the extent to which, or even whether, food webs species. provide an appropriate context for unraveling the anthro- pogenically forced changes in whales, including killer whales 2. The studies also reveal the panoply of interpretative (Orcinus orca), their interrelationships, and the derived impli- horrors facing all dynamic community analysis: Indi- cation for associated species.