8.9 Azores Case Study
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Spawning Frequency of Trachurus Mediterraneus (Carangidae) in the Sea of Marmara
www.trjfas.org ISSN 1303-2712 Turkish Journal of Fisheries and Aquatic Sciences 13: 441-446 (2013) DOI: 10.4194/1303-2712-v13_3_06 Spawning Frequency of Trachurus mediterraneus (Carangidae) in the Sea of Marmara Nazlı Demirel1,*, Ahsen Yüksek1 1 Istanbul University, Institute of Marine Science and Management, 34116, Vefa, Istanbul, Turkey. * Corresponding Author: Tel.: +90.212 4400000; Fax: +90.212 5268433; Received 10.April.2013 E-mail: [email protected] Accepted 28.June.2013 Abstract In this study the spawning frequency of Trachurus mediterraneus was estimated for the first time in the Mediterranean basin. The presence of the late-migratory nucleus stage oocytes and post ovulatory follicles (POFs) in the same ovaries were observed continuously during the sampling period. The daily percentage of spawning females with ovaries containing: late migratory nucleus (MN) stage, POFs (present up to 12-24h from the spawning event) was calculated as 11.7% and 18.6% respectively. The average percentage of females presenting one of the two different states was 15.3% which indicated that Mediterranean horse mackerel had high spawning rates in the Sea of Marmara. Our results indicated that T. mediterraneus is a multiple spawner and females spawn approximately every 6.6 days, therefore 20 times in the spawning period May-August 2009. Keywords: Spawning frequency, post ovulatory follicles, Mediterranean horse mackerel Marmara Denizi’nde Bulunan Trachurus mediterraneus (Carangidae) Türünün Üreme Sıklığı Özet Bu çalışmayla Akdeniz havzasında ilk defa T. mediterraneus türünün üreme sıklığına ilişkin değerlendirme ortaya konmuştur. Örnekleme dönemi boyunca aynı ovaryumda ileri çekirdek göçü evresindeki (ileri ÇG) oositlerle birlikte yumurtlama sonrası foliküllerin (YSF) bir arada bulunduğu gözlenmiştir. -
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Vol. 3: 41–50, 2008 AQUATIC BIOLOGY Printed August 2008 doi: 10.3354/ab00062 Aquat Biol Published online July 1, 2008 OPEN ACCESS Effects of water temperature, salinity and feeding regimes on metamorphosis, growth and otolith Sr:Ca ratios of Megalops cyprinoides leptocephali Hui-Lun Chen1, Kang-Ning Shen1, Chih-Wei Chang3, 4, Yoshiyuki Iizuka5, Wann-Nian Tzeng1, 2,* 1Institute of Fisheries Science, and 2Department of Life Science, National Taiwan University, Taipei, Taiwan 106, ROC 3National Museum of Marine Biology and Aquarium, Pingtung, Taiwan 944, ROC 4Institute of Marine Biodiversity and Evolution, National Donghwa University, Hualien, Taiwan 974, ROC 5Institute of Earth Sciences, Academia Sinica, Nankang, Taipei, Taiwan 115, ROC National Taiwan University, Taipei, Taiwan 106, ROC ABSTRACT: We examined the effects of water temperature, salinity and feeding regime on lepto- cephalus metamorphosis, and on daily growth increment deposition and strontium:calcium (Sr:Ca) ratios of otoliths in the Pacific tarpon Megalops cyprinoides. The tarpons at the pre-metamorphic lep- tocephalus stage (SI) were collected in the estuary, marked with tetracycline and then reared for 18 and 30 d in 2 independent experiments with different temperatures (20, 25 and 30°C), salinities (0, 10 and 35) and feeding regimes (fed and starved)—environmental conditions that the fish may experi- ence in the wild. Temporal changes in Sr:Ca ratios from the primordium to the otolith edge of the reared tarpon were examined with an electron probe microanalyzer. At the optimal temperature (25°C) in Expt I, the leptocephalus completed metamorphosis (SII and SIII) after ca. 2 wk irrespective of being fed or starved and reared in low (10) or high (35) salinity, although both somatic and otolith growth rates were lower in starved than in fed groups. -
Skates and Rays Diversity, Exploration and Conservation – Case-Study of the Thornback Ray, Raja Clavata
UNIVERSIDADE DE LISBOA FACULDADE DE CIÊNCIAS DEPARTAMENTO DE BIOLOGIA ANIMAL SKATES AND RAYS DIVERSITY, EXPLORATION AND CONSERVATION – CASE-STUDY OF THE THORNBACK RAY, RAJA CLAVATA Bárbara Marques Serra Pereira Doutoramento em Ciências do Mar 2010 UNIVERSIDADE DE LISBOA FACULDADE DE CIÊNCIAS DEPARTAMENTO DE BIOLOGIA ANIMAL SKATES AND RAYS DIVERSITY, EXPLORATION AND CONSERVATION – CASE-STUDY OF THE THORNBACK RAY, RAJA CLAVATA Bárbara Marques Serra Pereira Tese orientada por Professor Auxiliar com Agregação Leonel Serrano Gordo e Investigadora Auxiliar Ivone Figueiredo Doutoramento em Ciências do Mar 2010 The research reported in this thesis was carried out at the Instituto de Investigação das Pescas e do Mar (IPIMAR - INRB), Unidade de Recursos Marinhos e Sustentabilidade. This research was funded by Fundação para a Ciência e a Tecnologia (FCT) through a PhD grant (SFRH/BD/23777/2005) and the research project EU Data Collection/DCR (PNAB). Skates and rays diversity, exploration and conservation | Table of Contents Table of Contents List of Figures ............................................................................................................................. i List of Tables ............................................................................................................................. v List of Abbreviations ............................................................................................................. viii Agradecimentos ........................................................................................................................ -
The Diet of Conger Conger (L
THE DIET OF CONGER CONGER (L. 1758) IN THE DEEP-WATERS OF EASTERN MEDITERRANEAN SEA Anastasopoulou A., Mytilineou Ch., Lefkaditou E., Kavadas S., Bekas P., Smith C.J., Papadopoulou K.N., Dogramatzi K. , Papastamou N. Inst. of Marine Biological Resources, Hellenic Centre for Marine Research, 46.7 km Athens-Sounio, Mavro Lithari P.O. BOX 712, 19013 Anavissos, Attica, Greece, [email protected] Abstract The diet of European conger eel Conger conger was investigated for the first time in the Eastern Ionian Sea from specimens collected during experimental bottom long line fishing. Sampling was carried out of Cephalonia Island in deep waters ranging from 300 to 855 m depth in summer and autumn 2010. European conger eel diet was dominated by Fish. Natantia and Brachyura Crustacea were identified as secondary preys, while Cephalopoda, Sipunculida and Isopoda represented accidental preys. C. conger exhibits a benthopelagic feeding behavior as it preys upon both demersal and mesopelagic taxa. The high values of Vacuity index and the low stomach and intestine fullness indicated that the feeding intensity of C. conger in the deep-water of Eastern Ionian Sea was quite low. Larger individuals showed more intense feeding activity and consume larger preys than smaller ones. However, no statistically significant differences were detected in the diet composition and feeding intensity of the species between seasons or size groups. Keywords: European conger eel, stomach analysis, intestine analysis, feeding, Ionian Sea. Η ΔΙΑΤΡΟΦΗ ΤΟΥ CONGER CONGER (L. 1758) ΣΤΑ ΒΑΘΙΑ ΝΕΡΑ ΤΗΣ ΑΝΑΤΟΛΙΚΗΣ ΜΕΣΟΓΕΙΟΥ ΘΑΛΑΣΣΑΣ Αναστασοπούλου Α., Μυτηλιναίου Χ., Λευκαδίτου Ε., Καβαδδάς Σ., Μπέκας Π., Smith C.J., Παπαδοπούλου Κ., Ντογραμματζή Κ., Παπαστάμου Ν. -
Fisheries Overview, Including Mixed-Fisheries Considerations
ICES Fisheries Overviews Bay of Biscay and Iberian Coast ecoregion Published 30 November 2020 Version 2: 3 December 2020 6.2 Bay of Biscay and Iberian Coast ecoregion – Fisheries overview, including mixed-fisheries considerations Table of contents Executive summary .................................................................................................................................................................. 1 Definition of the ecoregion ...................................................................................................................................................... 1 Mixed-fisheries considerations Bay of Biscay .......................................................................................................................... 2 Mixed-fisheries considerations Iberian waters ...................................................................................................................... 10 Who is fishing ........................................................................................................................................................................ 18 Catches over time .................................................................................................................................................................. 21 Description of the fisheries .................................................................................................................................................... 23 Fisheries management measures ......................................................................................................................................... -
Ontogeny of Photophore Pattern in the Velvet Belly Lantern Shark, Etmopterus Spinax Julien M
ARTICLE IN PRESS ZOOLOGY Zoology 112 (2009) 433–441 www.elsevier.de/zool Ontogeny of photophore pattern in the velvet belly lantern shark, Etmopterus spinax Julien M. ClaesÃ,Je´roˆme Mallefet Catholic University of Louvain, Laboratory of Marine Biology, Place Croix du Sud, Kellner Building, B-1348, Louvain-la-Neuve, Belgium Received 8 October 2008; received in revised form 23 January 2009; accepted 23 February 2009 Abstract Bioluminescence is known to be of great ecological importance to a luminous organism but extremely few studies investigate the ontogeny of luminous capabilities. The photogenic pattern of the velvet belly lantern shark Etmopterus spinax was investigated over ontogeny (14.0–52.5 cm total length) to determine the scaling of the surface area and the photophore density of different luminous zones as well as the ecological consequences of ontogenetic variations in bioluminescence efficiency. According to the luminous zone considered, different scaling patterns were found for the surface areas while the photophore densities of all zones scale with negative allometry, even though photophore insertion occurs. No sexual differences in these relationships were found. Luminous zones can be placed in two morphologically different groups: the ‘‘coverage’’ and the ‘‘isolated’’ zones. While counter-illumination is certainly the function of the former, the latter are probably involved in intraspecific behaviours. Due to the discrepancy between luminous capabilities of these two luminous zone categories, there is an ontogenetic increase in the luminescence heterogeneity of the luminous pattern as it was shown by luminescence modelling and confirmed by direct observations of spontaneous luminescence in living sharks. This heterogeneity certainly represents a trade-off between an efficient ventral camouflage and a strong identification tool for intraspecific behaviours such as coordinate hunting, which would be particularly useful when E. -
Bouguerche Et Al
Redescription and molecular characterisation of Allogastrocotyle bivaginalis Nasir & Fuentes Zambrano, 1983 (Monogenea: Gastrocotylidae) from Trachurus picturatus (Bowdich) (Perciformes: Carangidae) off the Algerian coast, Mediterranean Sea Chahinez Bouguerche, Fadila Tazerouti, Delphine Gey, Jean-Lou Justine To cite this version: Chahinez Bouguerche, Fadila Tazerouti, Delphine Gey, Jean-Lou Justine. Redescription and molecular characterisation of Allogastrocotyle bivaginalis Nasir & Fuentes Zambrano, 1983 (Monogenea: Gas- trocotylidae) from Trachurus picturatus (Bowdich) (Perciformes: Carangidae) off the Algerian coast, Mediterranean Sea. Systematic Parasitology, Springer Verlag (Germany), 2019, 96 (8), pp.681-694. 10.1007/s11230-019-09883-7. hal-02557974 HAL Id: hal-02557974 https://hal.archives-ouvertes.fr/hal-02557974 Submitted on 29 Apr 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Bouguerche et al. Allogastrocotyle bivaginalis 1 Systematic Parasitology (2019) 96:681–694 DOI: 10.1007/s11230-019-09883-7 Redescription and molecular characterisation -
Monthly Highlights
Monthly Highlights No. 2 / 2021 In this issue As of 2021, the Monthly Highlights include Bulgaria among surveyed countries. According to data collected by EUMOFA from 13 EU Member States, in November 2020 striped venus and whelk together accounted for 12% of the total Contents first-sales value of the “Bivalves and other molluscs and aquatic invertebrates” commodity group. First sales in Europe Striped venus (Italy, Spain) and whelk From 2018 to 2020, the price of live, fresh, or chilled (Belgium, France, Netherlands) mussels imported in the EU from Norway fluctuated from 2,04 to 7,09 EUR/kg. In 2020, both price and Extra-EU imports volume exhibited a downward trend. Weekly average EU import prices of selected products from Over the last four years, German consumers spent selected countries of origin the most for a kilogram of fresh cod, (18,00 EUR/kg on average) compared to France Consumption Fresh cod in Germany, France, and the (16,80 EUR/kg) and the Netherlands (16,30 EUR/kg). Netherlands In 2019, the EU imports of fisheries and aquaculture products from South Africa accounted for over EUR Case studies 295 million and 80.597 tonnes. Hake, squid, and Fisheries and aquaculture in South Africa fishmeal constitute the bulk share of EU imports. Horse mackerel in the EU The largest market for horse mackerel exported by the EU is Egypt. In 2019, exports to the country Global highlights reached 54.000 tonnes, worth EUR 51 million, accounting for 50% of total export volume Macroeconomic context and 47% of value. Marine fuel, consumer prices, and In January 2021, the EU and Greenland concluded exchange rates negotiations for a new four-year Sustainable Fisheries Partnership Agreement (SFPA), which is the third most important agreement in place for the EU in financial terms. -
Updated Checklist of Marine Fishes (Chordata: Craniata) from Portugal and the Proposed Extension of the Portuguese Continental Shelf
European Journal of Taxonomy 73: 1-73 ISSN 2118-9773 http://dx.doi.org/10.5852/ejt.2014.73 www.europeanjournaloftaxonomy.eu 2014 · Carneiro M. et al. This work is licensed under a Creative Commons Attribution 3.0 License. Monograph urn:lsid:zoobank.org:pub:9A5F217D-8E7B-448A-9CAB-2CCC9CC6F857 Updated checklist of marine fishes (Chordata: Craniata) from Portugal and the proposed extension of the Portuguese continental shelf Miguel CARNEIRO1,5, Rogélia MARTINS2,6, Monica LANDI*,3,7 & Filipe O. COSTA4,8 1,2 DIV-RP (Modelling and Management Fishery Resources Division), Instituto Português do Mar e da Atmosfera, Av. Brasilia 1449-006 Lisboa, Portugal. E-mail: [email protected], [email protected] 3,4 CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. E-mail: [email protected], [email protected] * corresponding author: [email protected] 5 urn:lsid:zoobank.org:author:90A98A50-327E-4648-9DCE-75709C7A2472 6 urn:lsid:zoobank.org:author:1EB6DE00-9E91-407C-B7C4-34F31F29FD88 7 urn:lsid:zoobank.org:author:6D3AC760-77F2-4CFA-B5C7-665CB07F4CEB 8 urn:lsid:zoobank.org:author:48E53CF3-71C8-403C-BECD-10B20B3C15B4 Abstract. The study of the Portuguese marine ichthyofauna has a long historical tradition, rooted back in the 18th Century. Here we present an annotated checklist of the marine fishes from Portuguese waters, including the area encompassed by the proposed extension of the Portuguese continental shelf and the Economic Exclusive Zone (EEZ). The list is based on historical literature records and taxon occurrence data obtained from natural history collections, together with new revisions and occurrences. -
Mercury Info Sheet
Methyl Mercury The danger from the sea Report by SHARKPROJECT International • Aug. 31, 2008 Updated by Shark Safe Network Sept. 12, 2009 ! SHARK MEAT CONTAINS HIGH LEVELS OF METHYL MERCURY: A DANGEROUS NEUROTOXIN In the marine ecosystem sharks are on top of the food chain. Sharks eat other contaminated fish and accumulate all of the toxins that they’ve absorbed or ingested during their lifetimes. Since mercury is a persistent toxin, the levels keep building at every increasing concentrations on the way up the food chain. For this reason sharks can have levels of mercury in their bodies that are 10,000 times higher than their surrounding environment. Many predatory species seem to manage high doses of toxic substances quite well. This is not the case, however, with humans on whom heavy metal contamination takes a large toll. Sharks at the top end of the marine food chain are the final depots of all the poisons of the seas. And Methyl Mercury is one of the biologically most active and most dangerous poisons to humans. Numerous scientific publications have implicated methyl mercury as a highly dangerous poison. Warnings from health organizations to children and pregnant women to refrain from eating shark and other large predatory fish, however, have simply not been sufficient, since this “toxic food-information” is rarely provided at the point of purchase. Which Fish Have the Highest Levels of Methyl Mercury? Predatory fish with the highest levels of Methyl Mercury include Shark, King Mackerel, Tilefish and Swordfish. Be aware that shark is sold under various other names, such as Flake, Rock Salmon, Cream Horn, Smoked Fish Strips, Dried cod/stockfish, Pearl Fillets, Lemonfish, Verdesca (Blue Shark), Smeriglio (Porbeagle Shark), Palombo (Smoothound), Spinarolo (Spiny Dogfish), and as an ingredient of Fish & Chips or imitation crab meat. -
Identification Guide to the Deep-Sea Cartilaginous Fishes Of
Identification guide to the deep–sea cartilaginous fishes of the Southeastern Atlantic Ocean FAO. 2015. Identification guide to the deep–sea cartilaginous fishes of the Southeastern Atlantic Ocean. FishFinder Programme, by Ebert, D.A. and Mostarda, E., Rome, Italy. Supervision: Merete Tandstad, Jessica Sanders (FAO, Rome) Technical editor: Edoardo Mostarda (FAO, Rome) Colour illustrations, cover and graphic design: Emanuela D’Antoni (FAO, Rome) This guide was prepared under the “FAO Deep–sea Fisheries Programme” thanks to a generous funding from the Government of Norway (Support to the implementation of the International Guidelines on the Management of Deep-Sea Fisheries in the High Seas project) for the purpose of assisting states, institutions, the fishing industry and RFMO/As in the implementation of FAO International Guidelines for the Management of Deep-sea Fisheries in the High Seas. It was developed in close collaboration with the FishFinder Programme of the Marine and Inland Fisheries Branch, Fisheries Department, Food and Agriculture Organization of the United Nations (FAO). The present guide covers the deep–sea Southeastern Atlantic Ocean and that portion of Southwestern Indian Ocean from 18°42’E to 30°00’E (FAO Fishing Area 47). It includes a selection of cartilaginous fish species of major, moderate and minor importance to fisheries as well as those of doubtful or potential use to fisheries. It also covers those little known species that may be of research, educational, and ecological importance. In this region, the deep–sea chondrichthyan fauna is currently represented by 50 shark, 20 batoid and 8 chimaera species. This guide includes full species accounts for 37 shark, 9 batoid and 4 chimaera species selected as being the more difficult to identify and/or commonly caught. -
Marine Fishes of the Azores: an Annotated Checklist and Bibliography
MARINE FISHES OF THE AZORES: AN ANNOTATED CHECKLIST AND BIBLIOGRAPHY. RICARDO SERRÃO SANTOS, FILIPE MORA PORTEIRO & JOÃO PEDRO BARREIROS SANTOS, RICARDO SERRÃO, FILIPE MORA PORTEIRO & JOÃO PEDRO BARREIROS 1997. Marine fishes of the Azores: An annotated checklist and bibliography. Arquipélago. Life and Marine Sciences Supplement 1: xxiii + 242pp. Ponta Delgada. ISSN 0873-4704. ISBN 972-9340-92-7. A list of the marine fishes of the Azores is presented. The list is based on a review of the literature combined with an examination of selected specimens available from collections of Azorean fishes deposited in museums, including the collection of fish at the Department of Oceanography and Fisheries of the University of the Azores (Horta). Personal information collected over several years is also incorporated. The geographic area considered is the Economic Exclusive Zone of the Azores. The list is organised in Classes, Orders and Families according to Nelson (1994). The scientific names are, for the most part, those used in Fishes of the North-eastern Atlantic and the Mediterranean (FNAM) (Whitehead et al. 1989), and they are organised in alphabetical order within the families. Clofnam numbers (see Hureau & Monod 1979) are included for reference. Information is given if the species is not cited for the Azores in FNAM. Whenever available, vernacular names are presented, both in Portuguese (Azorean names) and in English. Synonyms, misspellings and misidentifications found in the literature in reference to the occurrence of species in the Azores are also quoted. The 460 species listed, belong to 142 families; 12 species are cited for the first time for the Azores.