Effect of Weight on Osmoregulation Ability in Rutilus Frisii Kutum Fingerlings
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Trends of Aquatic Alien Species Invasions in Ukraine
Aquatic Invasions (2007) Volume 2, Issue 3: 215-242 doi: http://dx.doi.org/10.3391/ai.2007.2.3.8 Open Access © 2007 The Author(s) Journal compilation © 2007 REABIC Research Article Trends of aquatic alien species invasions in Ukraine Boris Alexandrov1*, Alexandr Boltachev2, Taras Kharchenko3, Artiom Lyashenko3, Mikhail Son1, Piotr Tsarenko4 and Valeriy Zhukinsky3 1Odessa Branch, Institute of Biology of the Southern Seas, National Academy of Sciences of Ukraine (NASU); 37, Pushkinska St, 65125 Odessa, Ukraine 2Institute of Biology of the Southern Seas NASU; 2, Nakhimova avenue, 99011 Sevastopol, Ukraine 3Institute of Hydrobiology NASU; 12, Geroyiv Stalingrada avenue, 04210 Kiyv, Ukraine 4Institute of Botany NASU; 2, Tereschenkivska St, 01601 Kiyv, Ukraine E-mail: [email protected] (BA), [email protected] (AB), [email protected] (TK, AL), [email protected] (PT) *Corresponding author Received: 13 November 2006 / Accepted: 2 August 2007 Abstract This review is a first attempt to summarize data on the records and distribution of 240 alien species in fresh water, brackish water and marine water areas of Ukraine, from unicellular algae up to fish. A checklist of alien species with their taxonomy, synonymy and with a complete bibliography of their first records is presented. Analysis of the main trends of alien species introduction, present ecological status, origin and pathways is considered. Key words: alien species, ballast water, Black Sea, distribution, invasion, Sea of Azov introduction of plants and animals to new areas Introduction increased over the ages. From the beginning of the 19th century, due to The range of organisms of different taxonomic rising technical progress, the influence of man groups varies with time, which can be attributed on nature has increased in geometrical to general processes of phylogenesis, to changes progression, gradually becoming comparable in in the contours of land and sea, forest and dimensions to climate impact. -
Histopathological Effects and Toxicity of Atrazine Herbicide in Caspian Kutum, Rutilus Frisii Kutum, Fry
Iranian Journal of Fisheries Sciences 13(3) 702- 718 2014 Histopathological effects and toxicity of atrazine herbicide in Caspian Kutum, Rutilus frisii kutum, fry Khoshnood Z. 1*; Jamili Sh. 1; Khodabandeh S.2; Mashinchian Moradi A.1; Motallebi Moghanjoghi A.A.3 Received: June 2012 Accepted: May 2014 Abstract This study aimed to investigate the toxic effects of atrazine herbicide on the fry of Caspian Kutum (Rutilus frisii kutum, Kamensky, 1901). First the 96-h LC50 of the fry were exposed to atrazine at the concentration of 24.95 ppm was determined. Then the toxicity of this herbicide on Caspian kutum fry exposed to the concentration of 12.47ppm (1/2 LC50), for four days was measured and compared with a control group. Comparison of the length, weight and condition factor showed no significant differences between atrazine exposed and control group. The concentration of Na+, K+, Ca2+, Mg2+ and Cl- in the whole body of fry in control and atrazine exposure groups were as the following order: Ca2+>K+> Na +> Cl- >Mg2+ and Ca2+>Na+>K+>Mg2+>Cl-, respectively. Results showed that the concentration of all these ions were higher in atrazine exposure group than control group, except for Cl-, and the only significant differences was found in Na+ concentration. Major histopathological effects of atrazine on the gills were hyperplasia and thickening of the filaments, separation of the pavement cells of the lamellae epithelium from the pillar cells and swelling of the epithelial cells. Results of the present study showed that atrazine could affect the ion composition of the body, and caused major damages in gill epithelium even at sublethal concentration and acute exposure, but had no effects on the growth parameters. -
The Study on Fishing and Resource Management of Bony Fisheries Within Southern Caspian Sea
The Study on fishing and resource management of bony fisheries within Southern Caspian Sea Item Type Report Authors Abdolmalaki, Shahram; Taghavi, S.A.; Motalebi, A.A.; Sharif Rohani, M.; Ghasemi, S.; Parafkandeh Haghighi, F.; Fazli, H.; Vahabnejad, A.; Ghaninejad, D.; Karimi, D.; Rahmati, M.; Daryanabard, R.; Bandani, G.A.; Talebzadeh, S.A.; Akhoondi, M. Publisher Iranian Fisheries Science Research Institute Download date 30/09/2021 16:11:40 Link to Item http://hdl.handle.net/1834/13405 وزارت ﺟﻬﺎد ﻛﺸﺎورزي ﺳﺎزﻣﺎن ﺗﺤﻘﻴﻘﺎت ، آﻣﻮزش و ﺗﺮوﻳﺞﻛ ﺸﺎورزي ﻣﻮﺳﺴﻪ ﺗﺤﻘﻴﻘﺎت ﻋﻠﻮم ﺷﻴﻼﺗﻲ ﻛﺸﻮر – ﭘﮋوﻫﺸﻜﺪه آﺑﺰي ﭘﺮوري آﺑﻬﺎي داﺧﻠﻲ ﻋﻨﻮان : : ﻣﻄﺎﻟﻌﺎت ﺻﻴﺪ و ﻣﺪﻳﺮﻳﺖ ذﺧﺎﻳﺮ ﻣﺎﻫﻴﺎن اﺳﺘﺨﻮاﻧﻲ در ﺣﻮﺿﻪ ﺟﻨﻮﺑﻲ درﻳﺎي ﺧﺰر ﻣﺠﺮي : : ﺷﻬﺮام ﻋﺒﺪاﻟﻤﻠﻜﻲ ﺷﻤﺎره ﺛﺒﺖ 43144 وزارت ﺟﻬﺎد ﻛﺸﺎورزي ﺳﺎزﻣﺎن ﺗﺤﻘﻴﻘﺎت، آﻣﻮزش و ﺗﺮوﻳﭻ ﻛﺸﺎورزي ﻣﻮﺳﺴﻪ ﺗﺤﻘﻴﻘﺎت ﻋﻠﻮم ﺷﻴﻼﺗﻲ ﻛﺸﻮر ﻋﻨﻮان ﭘﺮوژه : ﻣﻄﺎﻟﻌﺎت ﺻﻴﺪ و ﻣﺪﻳﺮﻳﺖ ذﺧﺎﻳﺮ ﻣﺎﻫﻴﺎن اﺳﺘﺨﻮاﻧﻲ در ﺣﻮﺿﻪ ﺟﻨﻮﺑﻲ درﻳﺎي ﺧﺰر ﺷﻤﺎره ﻣﺼﻮب ﭘﺮوژه : 89049 - 8903 -12 -12 -14 ﻧﺎ م و ﻧﺎم ﺧﺎﻧﻮادﮔﻲ ﻧﮕﺎرﻧﺪه / ﻧﮕﺎرﻧﺪﮔﺎن : ﺷﻬﺮام ﻋﺒﺪاﻟﻤﻠﻜﻲ ﻧﺎم و ﻧﺎم ﺧﺎﻧﻮادﮔﻲ ﻣﺠﺮي ﻣﺴﺌﻮل ( اﺧﺘﺼﺎص ﺑﻪ ﭘﺮوژه ﻫﺎ و ﻃﺮﺣﻬﺎي ﻣﻠﻲ و ﻣﺸﺘﺮك دارد ) : - - ﻧﺎم و ﻧﺎم ﺧﺎﻧﻮادﮔﻲ ﻣﺠﺮي / ﻣﺠﺮﻳﺎن : ﺷﻬﺮام ﻋﺒﺪاﻟﻤﻠﻜﻲ ﻧﺎم و ﻧﺎم ﺧﺎﻧﻮادﮔﻲ ﻫﻤﻜﺎر( ان ) : ﺳﻴﺪ اﻣﻴﻦ اﷲ ﺗﻘﻮي - ﻋﺒﺎﺳﻌﻠﻲ ﻣﻄﻠﺒﻲ – ﻣﺼﻄﻔﻲ ﺷﺮﻳﻒ روﺣﺎﻧﻲ – ﻣﺨﺘﺎر آﺧﻮﻧﺪي – ﺳﻴﺪ ﻋﺒﺎس ﻃﺎﻟﺐ زاده - ﺷﻬﺮام ﻗﺎﺳﻤﻲ - ﺣﺴﻦ ﻓﻀﻠﻲ - آرزو وﻫﺎب ﻧﮋاد – داود ﻏﻨﻲ ﻧﮋاد - داﻳﻮش ﻛﺮﻳﻤﻲ - ﻓﺮخ ﭘﺮاﻓﻜﻨﺪه - ﻣﺮاﺣﻢ رﺣﻤﺘﻲ - رﺿﺎ درﻳﺎﻧﺒﺮد - ﻏﻼﻣﻌﻠﻲ ﺑﻨﺪاﻧﻲ ﻧﺎم و ﻧﺎم ﺧﺎﻧﻮادﮔﻲ ﻣﺸﺎور( ان ) : - - ﻧﺎم و ﻧﺎم ﺧﺎﻧﻮادﮔﻲ ﻧﺎﻇﺮ( ان ) : ﻓﺮﻫﺎد ﻛﻴﻤﺮام ﻣﺤﻞ اﺟﺮا : اﺳﺘﺎن ﺗﻬﺮان ﺗﺎرﻳﺦ ﺷﺮوع : /1/5 89 ﻣﺪت اﺟﺮا : 2 ﺳﺎل و 3 ﻣﺎه ﻧﺎﺷﺮ : ﻣﻮﺳﺴﻪ ﺗﺤﻘﻴﻘﺎت ﻋﻠﻮم ﺷﻴﻼﺗﻲ ﻛﺸﻮر ﺗﺎرﻳﺦ اﻧﺘﺸﺎر : ﺳﺎل1393 ﺣﻖ ﭼﺎپ ﺑﺮاي ﻣﺆﻟﻒ ﻣﺤﻔﻮظ اﺳﺖ . -
(Rutilus, Teleostei, Cyprinidae) Molecular Phylogenetics and Evolut
ARTICLE IN PRESS Molecular Phylogenetics and Evolution xxx (2008) xxx–xxx Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev Short Communication Molecular systematics, phylogeny and biogeography of roaches (Rutilus, Teleostei, Cyprinidae) V. Ketmaier a,*, P.G. Bianco b, J.-D. Durand c a Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 25, D-14476 Potsdam, Germany b Dipartimento di Zoologia, Università di Napoli ‘‘Federico II”, V. Mezzocannone 8, I-80134 Naples, Italy c IRD UR 070 RAP route des hydrocarbures, BP 1386, Bel Air, Dakar, Sénégal article info Article history: Received 7 March 2008 Revised 15 July 2008 Accepted 16 July 2008 Available online xxxx 1. Introduction two alternative hypotheses (Zardoya and Doadrio, 1999; Durand et al., 2000, 2002a,b, 2003; Ketmaier et al., 1998, 2003, 2004; Cyprinid species diversity is not evenly distributed across Eur- Tsigenopoulos et al., 2003 and references therein). Although many ope. Central Europe hosts a homogeneous ichthyofauna, while of these studies have invoked the Lago Mare phase to explain many taxa are endemic to relatively narrow Southern European patterns of divergence, evidence supporting it as the most likely areas. This led to the recognition of 13 ichthyogeographic districts scenario is not always unambiguous. around the Mediterranean Sea (Fig. 1), each of which characterized Here, we used roaches (genus Rutilus) to infer speciation pat- by its own assemblage of endemic species (Bianco, 1990). Two bio- terns of primary freshwater fishes in the Eastern peri-Mediterra- geographic hypotheses have been proposed to explain the evolu- nean area. -
The History and Future of the Biological Resources of the Caspian and the Aral Seas*
Journal of Oceanology and Limnology Vol. 36 No. 6, P. 2061-2084, 2018 https://doi.org/10.1007/s00343-018-8189-z The history and future of the biological resources of the Caspian and the Aral Seas* N. V. ALADIN 1, ** , T. CHIDA 2 , Yu. S. CHUIKOV 3 , Z. K. ERMAKHANOV 4 , Y. KAWABATA 5 , J. KUBOTA 6 , P. MICKLIN 7 , I. S. PLOTNIKOV 1 , A. O. SMUROV 1 , V. F. ZAITZEV 8 1 Zoological Institute RAS, St.-Petersburg 199034, Russia 2 Nagoya University of Foreign Studies, Nisshin 470-0197, Japan 3 Astrakhan State University, Astrakhan 414056, Russia 4 Aral Branch of Kazakh Research Institute of Fishery, Aralsk 120100, Kazakhstan 5 Tokyo University of Agriculture and Technology, Fuchu Tokyo 183-8509, Japan 6 National Institutes for the Humanities, Tokyo 105-0001, Japan 7 Western Michigan University, Kalamazoo 49008, USA 8 Astrakhan State Technical University, Astrakhan 414056, Russia Received Jul. 11, 2018; accepted in principle Aug. 16, 2018; accepted for publication Sep. 10, 2018 © Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract The term ‘biological resources’ here means a set of organisms that can be used by man directly or indirectly for consumption. They are involved in economic activities and represent an important part of a country’s raw material potential. Many other organisms are also subject to rational use and protection. They can be associated with true resource species through interspecifi c relationships. The Caspian and Aral Seas are continental water bodies, giant saline lakes. Both categories of species are represented in the benthic and pelagic communities of the Caspian and Aral Seas and are involved in human economic activities. -
Rutilus Frisii Kutum) Broodstock from the Southern Basin of the Caspian Sea
Turkish Journal of Veterinary and Animal Sciences Turk J Vet Anim Sci (2013) 37: 320-325 http://journals.tubitak.gov.tr/veterinary/ © TÜBİTAK Research Article doi:10.3906/vet-1201-20 A comparative study of some blood factors in male and female Caspian kutum (Rutilus frisii kutum) broodstock from the southern basin of the Caspian Sea Farid FIROUZBAKHSH*, Zeynab ABEDI, Hossain RAHMANI, Mohammad K. KHALESI Sari Agricultural Sciences and Natural Resources University, Sari, Iran Received: 15.01.2012 Accepted: 14.08.2012 Published Online: 03.06.2013 Printed: 27.06.2013 Abstract: In this study, some serum factors in male and female Caspian kutum (Rutilus frisii kutum) broodstocks were investigated. The estimated values were compared between male and female fish of various age groups. A total of 80 mature fish (40 males and 40 females) were randomly caught from the Shirood and Tajen rivers (southern Caspian Sea) during spawning season. Blood samples were then taken from the caudal peduncles and the serum biochemical parameters were measured according to common laboratory methods. Cholesterol levels showed significant differences (P < 0.05) between male and female broodstocks from the Tajen River, as well as between male and female kutum of the Tajen and Shirood rivers. Comparison of the estimated serum factors with the fish ages revealed no significant changes (P > 0.05). A high correlation was found between total protein and weight in fish from both rivers based on Pearson’s correlation. This study suggests that male and female variations in blood factors should be taken into account when these parameters are used to assess sex, age, and spawning sites. -
Effects of Different Starter Diets on Growth Indices of Caspian Kutum, Rutilus Frisii Kutum Larvae
Iranian Journal of Fisheries Sciences 11(1) 28-36 2012 Effects of different starter diets on growth indices of Caspian Kutum, Rutilus frisii kutum larvae Falahatkar B.*; Mohammadi H.; Noveirian H. Received: December 2010 Accepted: April 2011 Abstract Six different diets including two rainbow trout starters, Gammarus dry powder, shrimp dry powder, egg yolk dry powder and newly hatched Artemia were used in feeding of Caspian Kutum larvae. During a 4-week trial, larvae with a mean weight of 17.5 ± 4.7 mg were fed with three replicates and growth parameters were measured at the end of the experiment. Thirty fish in each experimental unit with 3 L volume were fed 6 times daily according to their satiation. Results showed that there were significant differences in the final weight, final length, body weight increase, voluntary feed intake and specific growth rate for weight and length among the treatments (P<0.05), but not in the condition factor (P>0.05). The best performance was observed in fish fed Artemia nauplii. The survival rate was significantly different among the treatment (P<0.05) which the highest (75.6 ± 3.8%) and lowest (22.2 ± 11.7%) were observed in fish fed Artemia nauplii and Coppens, respectively. According to obtained results, it appears that except Artemia, the most suitable and inexpensive diet is egg yolk powder, which can results in high growth performance and survival rates. The results of this study suggested that using dry non-live diets with good composition could be replaced with Artemia that had suitable growth and survival rate in Caspian Kutum during larval. -
Directory of Azov-Black Sea Coastal Wetlands
Directory of Azov-Black Sea Coastal Wetlands Kyiv–2003 Directory of Azov-Black Sea Coastal Wetlands: Revised and updated. — Kyiv: Wetlands International, 2003. — 235 pp., 81 maps. — ISBN 90 5882 9618 Published by the Black Sea Program of Wetlands International PO Box 82, Kiev-32, 01032, Ukraine E-mail: [email protected] Editor: Gennadiy Marushevsky Editing of English text: Rosie Ounsted Lay-out: Victor Melnychuk Photos on cover: Valeriy Siokhin, Vasiliy Kostyushin The presentation of material in this report and the geographical designations employed do not imply the expres- sion of any opinion whatsoever on the part of Wetlands International concerning the legal status of any coun- try, area or territory, or concerning the delimitation of its boundaries or frontiers. The publication is supported by Wetlands International through a grant from the Ministry of Agriculture, Nature Management and Fisheries of the Netherlands and the Ministry of Foreign Affairs of the Netherlands (MATRA Fund/Programme International Nature Management) ISBN 90 5882 9618 Copyright © 2003 Wetlands International, Kyiv, Ukraine All rights reserved CONTENTS CONTENTS3 6 7 13 14 15 16 22 22 24 26 28 30 32 35 37 40 43 45 46 54 54 56 58 58 59 61 62 64 64 66 67 68 70 71 76 80 80 82 84 85 86 86 86 89 90 90 91 91 93 Contents 3 94 99 99 100 101 103 104 106 107 109 111 113 114 119 119 126 130 132 135 139 142 148 149 152 153 155 157 157 158 160 162 164 164 165 170 170 172 173 175 177 179 180 182 184 186 188 191 193 196 198 199 201 202 4 Directory of Azov-Black Sea Coastal Wetlands 203 204 207 208 209 210 212 214 214 216 218 219 220 221 222 223 224 225 226 227 230 232 233 Contents 5 EDITORIAL AND ACKNOWLEDGEMENTS This Directory is based on the national reports prepared for the Wetlands International project ‘The Importance of Black Sea Coastal Wetlands in Particular for Migratory Waterbirds’, sponsored by the Netherlands Ministry of Agriculture, Nature Management and Fisheries. -
Fishery and Population Dynamics of Caspian Kutum, Rutilus Frisii Kutum (Cyprinidae), in the Caspian Sea
Fishery and population dynamics of Caspian kutum, Rutilus frisii kutum (Cyprinidae), in the Caspian Sea Item Type thesis Authors Afraei Bandpei, Mohammadali Publisher Universiti Sains Malaysia Download date 01/10/2021 06:55:18 Link to Item http://hdl.handle.net/1834/40686 FISHERY AND POPULATION DYNAMICS OF CASPIAN KUTUM, Rutilus frisii kutum (CYPRINIDAE), IN THE CASPIAN SEA by MOHAMMADALI AFRAEI BANDPEI Thesis submitted in fulfillment of the requirements for the degree of Doctor of Philosophy October 2010 ACKNOWLEDGEMENT All praises to Allah Almighty whose countless blessings enabled me to complete this thesis. The Iranian Fisheries Research Organization (IFRO) and Agriculture Training Research Organization (ATRO) supported this study. The materials were obtained from a my province project entitle “Age, growth, feeding items, and reproductive of Rutilus frisii kutum in the Caspian Sea‟‟ performed with cooperation at the Caspian Sea Ecological Research Center in Sari, Inlandwaters Aquaculture Research Center in Guilan, and Inlandwaters Aquatic Stock Research Center in Golestan provinces. Thanks are due to the previous and now managers of the Agriculture Training Research Organization (ATRO) Dr. Khalghani and Dr. Pourhemat and to the head of the Iranian Fisheries Research Oraganization (IFRO) Dr. Motalebi, for financial support. I am very grateful to my supervisor, Prof. Mashhor Mansor who always gives me constructive advices, guidance, encouragement, critical reading, and moral support during the research of my thesis, thank you so much. My former co-supervisor, Dr. Khoo Kay Huat, thank you for your help especially on fish physiology and ecology. I would like to thanks my co-supervisors, associate Prof. Dr. Shahrul Anuar Mohd Sah and Dr. -
Exotic Species in the Aegean, Marmara, Black, Azov and Caspian Seas
EXOTIC SPECIES IN THE AEGEAN, MARMARA, BLACK, AZOV AND CASPIAN SEAS Edited by Yuvenaly ZAITSEV and Bayram ÖZTÜRK EXOTIC SPECIES IN THE AEGEAN, MARMARA, BLACK, AZOV AND CASPIAN SEAS All rights are reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means without the prior permission from the Turkish Marine Research Foundation (TÜDAV) Copyright :Türk Deniz Araştırmaları Vakfı (Turkish Marine Research Foundation) ISBN :975-97132-2-5 This publication should be cited as follows: Zaitsev Yu. and Öztürk B.(Eds) Exotic Species in the Aegean, Marmara, Black, Azov and Caspian Seas. Published by Turkish Marine Research Foundation, Istanbul, TURKEY, 2001, 267 pp. Türk Deniz Araştırmaları Vakfı (TÜDAV) P.K 10 Beykoz-İSTANBUL-TURKEY Tel:0216 424 07 72 Fax:0216 424 07 71 E-mail :[email protected] http://www.tudav.org Printed by Ofis Grafik Matbaa A.Ş. / İstanbul -Tel: 0212 266 54 56 Contributors Prof. Abdul Guseinali Kasymov, Caspian Biological Station, Institute of Zoology, Azerbaijan Academy of Sciences. Baku, Azerbaijan Dr. Ahmet Kıdeys, Middle East Technical University, Erdemli.İçel, Turkey Dr. Ahmet . N. Tarkan, University of Istanbul, Faculty of Fisheries. Istanbul, Turkey. Prof. Bayram Ozturk, University of Istanbul, Faculty of Fisheries and Turkish Marine Research Foundation, Istanbul, Turkey. Dr. Boris Alexandrov, Odessa Branch, Institute of Biology of Southern Seas, National Academy of Ukraine. Odessa, Ukraine. Dr. Firdauz Shakirova, National Institute of Deserts, Flora and Fauna, Ministry of Nature Use and Environmental Protection of Turkmenistan. Ashgabat, Turkmenistan. Dr. Galina Minicheva, Odessa Branch, Institute of Biology of Southern Seas, National Academy of Ukraine. -
Determination of Acute Toxicity of Atrazine Herbicide in Caspian Kutum, Rutilus Frisii Kutum, Larvae Z
World Academy of Science, Engineering and Technology International Journal of Environmental and Ecological Engineering Vol:8, No:12, 2014 Determination of Acute Toxicity of Atrazine Herbicide in Caspian Kutum, Rutilus frisii kutum, Larvae Z. Khoshnood, L. Khoshnood common carp (Cyprinus carpio) held in fresh water, indicating Abstract—Pesticides and drugs used in agriculture and veterinary osmoregulatory disturbances [4]. In addition, in vitro studies medicine may end up in aquatic environments and bioaccumulate in in fish have shown that atrazine may affect the secretion of the food chain, thus causing serious problems for fauna and human cortisol, involved in osmoregulation and stress response [5]. health. For determination of the toxic effects of atrazine herbicide on Early developmental stages are considered to be one of the Caspian kutum, Rutilus frisii kutum larvae, the 96-h LC50 of atrazine was measured for newly hatched larvae as 18.53 ppm. Toxicity of most sensitive stages in the fish life cycle to the toxic effects atrazine herbicide on Caspian kutum larvae was investigated using of chemical contaminants [6]. Short-term sublethal effects on concentrations: 9.25ppm, 4.62 ppm and 2.31 ppm for 7 days. growth, behavior or osmotic control may affect the survival of Comparison of the length, weight and condition factor showed that these critical stages and impact recruitment [7]-[9]. For no significant differences between atrazine exposed and control + + 2+ 2+ - example, loss of osmotic control altering water content may groups. The concentration of Na , K , Ca , Mg and Cl in whole influence larval density and buoyancy. The vertical position of body of larvae in control and atrazine exposure groups were measured and the results showed that concentrations of all these ions larvae in the water column affects their patterns of drift and is higher in atrazine exposure group than control group. -
Reproductive Biology Spermatogenesis and Biochemical Characteristics of Male Sparid Fish Dentex Dentex from the South Eastern Mediterranean Coast
Egyptian Journal of Aquatic Research (2016) xxx, xxx–xxx HOSTED BY National Institute of Oceanography and Fisheries Egyptian Journal of Aquatic Research http://ees.elsevier.com/ejar www.sciencedirect.com FULL LENGTH ARTICLE Reproductive biology spermatogenesis and biochemical characteristics of male sparid fish Dentex dentex from the south eastern Mediterranean coast S.S. Assem, R.F. Ismail, A.F. Fahmy, H.S. El-Sayed, M.A. Al-Absawey *, N.M. Abou Shabana National Institute of Oceanography & Fisheries Alex, Egypt Received 12 July 2015; revised 30 August 2015; accepted 25 November 2015 KEYWORDS Abstract The present study focuses on reproductive biology parameters and histological and fine Dentex dentex; structure investigations of testes maturation, in respect to steroid hormones and fatty acids’ profile. Spermatogenesis; All males over 30 cm in length were found to be mature. Gonadosomatic index (GSI) of males Ultrastructure; increased progressively to reach a peak value in May and June. In Dentex dentex, the spermatogo- Fatty acids; nia were detected throughout the year in the peripheral zone of the testes. Spermatocytes are char- Steroid hormones acterized by large nuclei with higher electron density and a layer of cytoplasm. The nuclei of spermatids were characterized by a condensed chromatin material. The early spermatid had a cen- tral nucleus and a large number of mitochondria. One big mitochondrion lies beneath the head of the sperm. The seasonal change of serum testosterone correlates with gonadal development. The presence of nearly ripe and ripe male D. dentex coincides with the surge of testosterone and the decrease in estradiol continues throughout the spawning periods.