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Synopsis of Biological Data on Rohu Labeo Rohita

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Synopsis of Biological Data on Rohu Labeo Rohita FAO Fisherdes _3ynopsis No. 111 1.7.(3/F111 (Distribution restricted) SAST L. rohita - 1,40(02),024,15 SYNOPSIS OF BIOLOGn".!_. DATA ON ROHU Labeo rohita GiaLigilto6J, 10,7,J F O FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS 4 vt DOCUMENTS OF THE FISHERY RESOURCES DOCUMENTS DE LADIVISIONDES RES- DOCUMENTOS DE LA DIRECCION DE RECURSOS DIVISION OF FAO DEPARTMENT OF FISHERIES SOURCES HALIEUTIQUES DU DEPARTEMENT PESQUEROS DEL DEPARTAMENTO DE PESCA DES PECHES DE LA FAO DE LA FAO Documents which are not official FAO publications Des documents qui ne figurent pas parmiles Esta Dirección publica varias series de documentos are issuedinsevera!series.Theyaregiven 'a publications officielles de la FAO sont publiés dans que no pueden considerarse como publicaciones restricted distribution and this fact should be indicated diversesseries.Ilsfontseulementl'objetd'une oficiales de la FAO. Todos ellos tienen distribución if they are cited. Most of them are prepared as distribution restreinte, aussi convient-il de le préciser limitada, circunstancia que debe indicarse en el caso working papers for meetings, or are summaries of lorsque ces documents sont cites.IIs'agit le plus de ser citados. La mayoría de los títulos que figuran informationfor use ofMemberGovernments, souvent de documents de travail prepares pour des en dichas series son documentos de trabajo prepara- organizations, and specialists concerned. These series réunions, ou de resumes d'information à l'intention dos parareuniones o resúmenes de información are the following: des gouvernements des pays membres, ainsi que des destinados a los estados miembros, organizaciones y organisations et spécialistes intéressés. Ces series sont especialistas interesados. Estas series son las siguientes: les suivantes: FAO Fisheries Report FIR/R (No.) FAO Fisheries Circular FIR/C (No.) FAO Fisheries Synopsis FIR/S (No.) FAO,Rapports sur les péches FAO, Circulaire des péches Synopsis FAO sur les pêches FAO Informes de pesca Circular de Pesca de la FAO Sinopsis FAO sobre la pesca Specialgroupsofsynopses areidentifiedby Des catégories spéciales de synopses sont identifiées Grupos especiales de sinopsis se distinguen con symbols followed by classification numbers based on l'aide de symboles suivis des chiffres de classification lassiglassiguientes,seguidaspornúmerosde indexed code of "ASFA": bases sur le code d'indexation dele « ASFA »: clasificación que se basan enlasclaves delos índices de la «ASFA»: SASTData concerningcertain species andfish SAST Données sur certaines especes et populations SASTDatos relativos a ciertas especies y stocks de poissons poblaciones MAST Information on methods and subjects MASTRenseignements sur des methodes et des sujeta MAST Sinopsis sobre métodos y materias OT Oceanographic data OT Données océanographiques OT Sinopsis sobre oceanografía IT Limnological data IT Données limnologiques IT Sinopsis sobre limnologfa FAO Fisheries Technical Papers FIR /T (No.) Documents techniques FAO sur les péches Documentos técnicos de la FAO sobre la pesca Special groups of Technical Papers are identified by: Des catégories s'Aciales de documents techniques Grupos especiales de documentos técnicosse sont identifiées è l'aide des symboles suivants: identifican por las siglas siguientes: RE Indexed lists of experts and institutions drawn RE Listes indexées d'experts et institutions tirées RE Listas indices de expertos y de instituciones from Registers maintained by theFishery des registres tenus è jour par la Division des tomadas de los registros que se llevan en la Resources Division ressources halieutiques Dirección de Recursos Pesqueros IN Provisional editions of inventories andlists IN Editions provisoires des listeset inventaires IN Ediciones provisionales de los inventarios y of fishery data stored and maintained by the concernant les donnéessur les peches listasde datos depesca acumulados Y FAO Fishery Data Centre accumulées et mises à jour par leCentre guardados por el Centro de Datos Pesqueros de données halieutiques de la FAO de la FAO CB Listsofperiodicals,specialsectionsof C B Listes de periodiques, des sections s'Aciales CB Listas de periódicos, secciones especiales de "Aquatic Sciences and Fisheries Abstracts de la «AquaticSciences and Fisheries la «Aquatic Sciences and Fisheries Abstracts (ASFA)," special bibliographies and papera Abstracts (ASFA1», des bibliographies parti- (ASFA)», bibliografías especiales y trabajos concerning documentation problema culières et des articles sur les problemes de relativos a los problemas de documentación documentation MFS Provisionaleditionsof "FAO Manualsin MFS Editions provisoires des «Manuels FAO de MFS Ediciones provisionales de los «Manuales de Fisheries Science" science halieutique» la FAO de Ciencias Pesqueras» WAFR Provisional reviews of fisheries resources and WAFR Syntheses provisoires des ressources halieuti- WAFR Resefias provisionales de los recursos their level of exploitation, by regions or by ques et leur niveau d'exploitation, préparées, pesqueros Y de su estadoactual de species groups, within the WorldAppraisal par régions ou groupes d'especes, dans le explotación, por regiones o por grupos de of Fishery Resources system cadre du Programme mondial pour révaluation especies, en el marco del sistema mundial des ressources haiieutiques para la evaluación de los recursos pesqueros Some documents also have another identification, Certains documents portent parfois d'autres numé- Algunos documentos tienen también otra identi- if,for example, they have been contributedto a ros-cridentification, par exemple s'ils ont été prepares ficaciónsi,por ejemplo, son contribuciones a una meetingfor whichpapershave been numbered pour uneréuniondontlesdocuments ontété reunión cuyos documentos han sido marcados con according to another system. marqués à l'aide d'un autre systeme. arreglo a otros sistemas. FAO Fisheries Synopsis No. 111 FIRS/S111 (Distri,bution restricted) SAST - L. rohita - 1,40(02),024,15 SYNOPSIS OF BIOLOGICAL DATA ON ROHU Labeo rohita (Hamilton, 1822) Prepared by H.A. Khan and V.G. Jhingran Central Inland Fisheries Research Institute (I.C.A.R.) Barrackpore, West Bengal India FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Rome, June1975 PREPARATION OF THIS SYNOPSIS The present document was included in the FAO Species Synopsis Series in view of the growing importance of Labeo rohita in fish culture, especially on the Indian subcontinent. The details set out in this paper are based on data collected by the authors in the course of their personal research work on the species and also on information compiled from various sources, most of which are included in the reference list. Distribution Bibliographic entry: Authors Khan, H.A. & V.G. Jhingran(1975) FAO Department of Fisheries FAO Fish.Synop., (111):100 p. FAO Regional Fisheries Officers Synopsis of biological data on rohu Regional Fisheries Councils and Commissions Labeo rohita (Hamilton, 1822) Selector SI Nomenclature. Taxonomy. Morphology (organisms). Geographical distribution. Ecology. Life history. Growth. Behaviour. Population dynamics. Fishing gear. Fishing grounds. Fishery management. Rearing. Fish culture. Artificial feeding. Bangladesh. Burma. India, Nepal. Pakistan. FIRS/S111 L. rohita CONTENTS Page 1 IDENTITY 1.1 Nomenclature 1 1.11 Valid name 1 1.12 Objective synonymy 1 1.2 Taxonomy 1.21 Affinities 1.22 Taxonomic status 1 1.23 Subspecies* 1.24 Standard common names, vernacular names 1.3 Morphology 4 1.31 External morphology 4 1.32 Cytomorphology 4 1.33 Protein specificity 4 2 DISTRIBUTION 10 2.1 Total area 10 2.2 Differential distribution 10 2.21 Spawn, larvae and juveniles 10 2.22Adults 10 2.3 Determinants of distribution changes 11 2.4 Hybridization 11 2.41 Hybrids 11 2.42 Influence of natural hybridization in ecology and morphology 14 3 BIONOMICS AND LITE HISTORY 14 3.1 Reproduction 14 3.11 Sexuality 14 3.12 Maturity (age and size) 14 3.13 Mating 14 3.14Fertilization* 3.15 Gonads 19 3.16 Spawning 19 3.17 Spawn 32 ii FIRS/5111 L. rohita 3.2Pre-adult phase 32 3.21 Embryonic phase 32 3.22 Larval phase 32 3.23 Adolescent phase 37 3.3Adult phase 37 3.31 Longevity 37 3.32 Hardiness 37 3.33 Competitors 37 3.34 Predators 37 3.35 Parasites, diseases, injuries and abnormalities 37 3.4Nutrition and growth 42 3.41 Feeding 42 3.42 Food 43 3.43 Growth rate 43 3.44Metabolism* 3.5 Behaviour 54 3.51 Migration and local movements 54 Schooling 3.52 54 3.53Response to stimuli* POPULATION 4 54 4.1 Structure 54 Sex ratio 4.11 54 4.12Age composition 54 Size composition 4.13 54 4.2Abundance and density (of population)* 4.3Natality and recruitment 57 Reproduction rates 4.31 57 4.32Factors affecting reproduction* Recruitment 4.33 57 4.4Mortality and morbidity 57 4.41 Mortality rates 57 4.42Factors causing or affecting mortality 57 4.43Factors affecting morbidity 57 FIRS/S111 L. rohita iii 4.44Relation ofmorbidity to mortality rates* 4.5 DYnamics of population 58 4.6 The population in the community and the ecosystem 59 5 EXPLOITATION 61 5.1 Fishing equipment 61 5.11 Gears 61 5.12Boats 61 5.2Fishing areas 61 5.21 General geographic distribution 61 5.22Geographic range 61 5.23Depth ranges 61 5.24Conditions of the grounds* 5.3 Fishing seasons 61 5.31 General pattern of season(s) 61 5.32 Dates of beginning, peak and end of season(s) 62 5.33 Variation in dates or duration of season 62 5.4Fishing operations and results 62 5.41 Effort and intensity* 5.42 Selectivity* 5.43 Catches 62 6 PROTECTION AND MANAGEMENT 64 6.1 Regulatory (legislative) measures 64 6.11 Limitation
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