› › Domestication And Feed Conversion Ratio Of Cardisoma Armatum The Nigerian Land Crab

Domestication and Feed Conversion Ratio of Cardisoma Armatum, the Nigerian Land Crab

Author : Jolaosho Toheeb

Publisher : GRIN Verlag

Page : 40 pages

File Size : 20,88 MB

Release : 2021-02-10

Category : Science

ISBN : 3346343901

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Book Description

Scientific Study from the year 2021 in the subject Biology - Zoology, grade: A, Lagos State University (Nigeria), course: Fisheries and Aquatic biology, language: English, abstract: The objective of this study is to evaluate the domestication and the growth performance of the land crab (Cardisoma Armatum) cultured in a rectangular concrete unit. Crabs are part of the basic components of the ecosystem and they are consumed as food in many countries. Over 100 species of crabs are known worldwide with nine species common in West African countries especially Nigeria. Crabs are decapods crustaceans which have a very short tail and are covered with a thick shell, or exoskeleton and are armed with a single pair of claws. There are over 6,793 species of crab spread across the oceans, fresh water, and even on land. Among the species are the land crab, the big fisted swim crab (callinectes amnicola), and (callinectes latmanus). These 3 species are edible ones.Crabs mostly occur at the mouth of estuaries and along the course of many main rivers. Crabs which are the basic components of the ecosystem are the most advanced members of the phylum Arthropoda. The freshwater crabs of Nigeria are true crabs which can be distinguished from false crabs by not having 5 pairs of the pereiopods totally or partly concealed beneath the carapace, the antennae were always placed between the inner margin of orbit and fused Pterygostomial region with endotome. True crabs belong to the Suborder Brachyura of order Decapoda under Class Crustacea. It shows the greatest size range of all arthropods such as observed in lobsters, prawns, crayfishes, shrimps, hermit crab and true crabs.



Fisheries Biology, Assessment and Management

Author : Michael King

Publisher : John Wiley & Sons

Page : 484 pages

File Size : 48,3 MB

Release : 2013-04-16

Category : Technology & Engineering

ISBN : 111868804X

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Book Description

This excellent second edition of Fisheries Biology, Assessment and Management, has been fully updated and expanded, providing a book which is an essential purchase for students and scientists studying, working or researching in fisheries and aquatic sciences. In the same way that excessive hunting on land has threatened terrestrial species, excessive fishing in the sea has reduced stocks of marine species to dangerously low levels. In addition, the ecosystems that support coastal marine species are threatened by habitat destruction, development and pollution. Open access policies and subsidised fishing are placing seafood in danger of becoming a scarce and very expensive commodity for which there is an insatiable demand. Positive trends include actions being taken to decrease the incidental catches of non-target species, consumer preferences for seafood from sustainable fisheries, and the establishment of no-take areas that provide refuges for marine species. But there is an urgent need to do more. Because there is an increasing recognition of the need to manage ecosystems as well as fish stocks, this second edition of this bestselling text book includes an additional chapter on marine ecology. Chapters on parameter estimation and stock assessment now include step-by-step instructions on building computer spreadsheet models, including simulations with random variations that realistically emulate the vagaries of nature. Sections on ecosystem management, co-management, community-based management and marine protected areas have been expanded to match the increased interest in these areas. Containing many worked examples, computer programs and numerous high quality illustrations, Fisheries Biology, Assessment and Management, second edition, is a comprehensive and essential text for students worldwide studying fisheries, fish biology, aquatic and biological sciences. As well as serving as a core text for students, the book is a superb reference for fisheries and aquatic researchers, scientists and managers across the globe, in both temperate and tropical regions. Libraries in all universities where fish biology, fisheries, aquatic sciences and biological sciences are studied and taught will need copies of this most useful new edition on their shelves. Supplementary material is available at: www.blackwellpublishing.com/king



The role of livestock in food security, poverty reduction and wealth creation in West Africa

Author : Food and Agriculture Organization of the United Nations

Publisher : Food & Agriculture Org.

Page : 260 pages

File Size : 36,28 MB

Release : 2020-07-01

Category : Technology & Engineering

ISBN : 9251323399

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Book Description

With the objective of gaining a better insight into the challenges and opportunities of the livestock sub-sector in West Africa, FAO has conducted several studies and held various workshops in recent years. The outcomes of these studies and workshops conducted between 2009 and 2014 were published and distributed as hard copy reports and disseminated as on-line publications. These reports included topics such as value chains, cross-border transhumance, animal feed resources, priority animal diseases, among others, were informative in their own right. Still, the fact that they targeted specific areas of livestock in a fragmented manner did not address the need of readers whose wish was to have a comprehensive understanding of the livestock sector in West Africa. It is in response to this demand for a comprehensive outlook of the West African Livestock sub-sector that different reports and studies have been compiled into this one book. The book has twelve chapters, covering almost all aspects of livestock in the region. Attempts were made to enrich the information provided by including eight short case studies focusing on different aspects of the livestock sub-sector in West Africa. The book attempts to fill the gap of a need for comprehensive information on the potential, performance, challenges, and prospects of the livestock sub-sector in West Africa.



Textbook of Veterinary Anatomy

Author : Keith M. Dyce

Publisher : Saunders

Page : 858 pages

File Size : 45,61 MB

Release : 2010

Category : Medical

ISBN :

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Book Description

Offering comprehensive coverage of core anatomic concepts, this respected, clinically oriented text is the definitive source for a complete understanding of veterinary anatomy. Gain the working anatomic knowledge that is crucial to your understanding of the veterinary basic sciences, as well as detailed information directly applicable to the care of specific animal species, including dogs, cats, horses, cows, pigs, sheep, goats, and birds. Each chapter includes a conceptual overview that describes the structure and function of an anatomic region, accompanied by new full-color dissection photographs that illustrate the relevance of anatomy to successful veterinary practice. Content is logically organized into two main sections - a general introduction to mammalian anatomy and a region-specific breakdown - to make studying more efficient and ensure greater understanding. Comprehensive, all-in-one coverage of all major species presents everything you need to master anatomic concepts in one text. Focus on essential anatomy of each species delivers just the right level of detail to help you establish a solid foundation for success. For the first time all images in the text appear in full color! This lifelike presentation clarifies anatomic concepts and structures in vibrant detail. Vivid full-color dissection photographs help you translate anatomic knowledge to clinical practice and confidently perform dissection procedures. A companion Evolve Resources website reinforces your understanding and helps you prepare for the NAVLEÒ board exam with 300 exam-style practice questions, a full-color electronic image collection, and more.



Evolutionary Ecology of Social and Sexual Systems

Author : J. Emmett Duffy

Publisher : Oxford University Press

Page : 519 pages

File Size : 26,10 MB

Release : 2007-09-06

Category : Science

ISBN : 0199720681

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Book Description

Understanding of animal social and sexual evolution has seen a renaissance in recent years with discoveries of frequent infidelity in apparently monogamous species, the importance of sperm competition, active female mate choice, and eusocial behavior in animals outside the traditional social insect groups. Each of these findings has raised new questions, and suggested new answers, about the evolution of behavioral interactions among animals. This volume synthesizes recent research on the sexual and social biology of the Crustacea, one of the dominant invertebrate groups on earth. Its staggering diversity includes ecologically important inhabitants of nearly every environment from deep-sea trenches, through headwater streams, to desert soils. The wide range of crustacean phenotypes and environments is accompanied by a comparable diversity of behavioral and social systems, including the elaborate courtship and wildly exaggerated morphologies of fiddler crabs, the mysterious queuing behavior of migrating spiny lobsters, and even eusociality in coral-reef shrimps. This diversity makes crustaceans particularly valuable for exploring the comparative evolution of sexual and social systems. Despite exciting recent advances, however, general recognition of the value of Crustacea as models has lagged behind that of the better studied insects and vertebrates. This book synthesizes the state of the field in crustacean behavior and sociobiology and places it in a conceptually based, comparative framework that will be valuable to active researchers and students in animal behavior, ecology, and evolutionary biology. It brings together a group of internationally recognized and rising experts in fields related to crustacean behavioral ecology, ranging from physiology and functional morphology, through mating and social behavior, to ecology and phylogeny. Each chapter makes connections to other, non-crustacean taxa, and the volume closes with a summary section that synthesizes the contributions, discusses anthropogenic impacts, highlights unanswered questions, and provides a vision for profitable future research.



Contested Environments

Author : Nick Bingham

Publisher : John Wiley & Sons

Page : 356 pages

File Size : 32,97 MB

Release : 2003-07-09

Category : Technology & Engineering

ISBN : 9780470850008

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Book Description

Why are food scares become so common? Whose voices count in decisions affecting the landscapes where we live? Will we soon be wars over water? What makes people protest outside international trade meetings? These are just a few of the questions that are explored in Contested Environments. By bringing together perspectives from science, social science, technology, and humanities, the book addresses in a uniquely interdisciplinary way why environmental issues are so often controversial. Other features include the detailed examination of a wide range of topics from specific disputes such as those around GM crops, national parks, energy policy, water supply, and international trade to broader debates like environmental justice, economic valuation of environments, and the media the promotion of integrative thinking through the book-wide use of the concepts of value, power, and action the inclusion of frequent activities to encourage readers to develop both their appreciation of particular issues and generic skills the rich illustration of the text with examples from around the world. The book is part of a series entitled Environment: Change, Contest and Response. The series forms a significant part of an interdisciplinary Open University course on environmental matters. The other books in the series are: Understanding Environmental Issues; Changing Environments; Environmental Responses.



Fish Population Dynamics and Stock Assessment

Author : N Jayakumar

Publisher : Daya Publishing House

Page : 144 pages

File Size : 41,81 MB

Release : 2018

Category :

ISBN : 9789388173254

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Book Description

Fisheries tend to collapse because of fleet over-capacity, leading to harvesting the stocks of fish beyond their ability to recover. On the other hand, fish stocks may also be under-utilized because of fleet under-capacity. The fishery managers have to strike a balance by directly controlling the fishing capacity (input control) and/or by setting restrictions on the catch (output control). The key factor in the success of striking this balance is the application of fisheries management based on scientific advice coming from results of stock assessment models. This book entitled "Fish Population Dynamics and Stock Assessment" has been written to meet the requirements of graduate, post graduate students, researchers and scientists in fish stock assessment. Written in a textbook form, this book encompasses the knowledge of principles of stock assessment, sampling techniques, age determination, growth parameters, mortality parameters, gear selection, stock assessment models, fisheries management etc. If this book could help and guide the students and researchers, we shall feel amply rewarded. The book contains 16 chapters that have been explained very clearly with numerous illustrative examples, leaving no scope for confusion.





Ecological Comparisons of Sedimentary Shores

Author : K. Reise

Publisher : Springer Science & Business Media

Page : 392 pages

File Size : 20,39 MB

Release : 2012-12-06

Category : Science

ISBN : 3642565573

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Book Description

Sedimentary coasts with their unique forms of life and productive ecosystems are one of the most threatened parts of the biosphere. This volume analyzes and compares ecological structures and processes at sandy beaches, tidal mudflats and in shallow coastal waters all around the world. Analyses of local processes are paired with comparisons between distant shores, across latitudinal gradients or between separate biogeographic provinces. Emphasis is given to suspension feeders in coastal mud and sand, to biogenic stabilizations and disturbances in coastal sediments, to seagrass beds and faunal assemblages across latitudes and oceans, to recovery dynamics in benthic communities, shorebird predation, and to experimental approaches to the biota of sedimentary shores.



The Biology of Decapod Crustacean Larvae

Author : Klaus Anger

Publisher : CRC Press

Page : 262 pages

File Size : 16,8 MB

Release : 2001-06-01

Category : Science

ISBN : 9789026518287

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Book Description

About 90 per cent of the 10,000 known species of the Crustacea Decapoda live in oceans and adjacent coastal and estuarine regions, and most of them pass through a complex life history comprising a benthic (juvenile-adult) and a planktonic (larval) phase. The larvae show a wide array of adaptations to the pelagic environment, including modifications in their functional morphology, anatomy, the molting cycle, nutrition, growth, chemical composition, metabolism, energy partitioning, ecology and behaviour.;All these traits are reviewed in this volume, attempting to promote an integrated, multidisciplinary view of the biology of larval Decapoda and other crustacean taxa. Emphasis is placed on the lesser-known anatomical, bioenergetic and ecophysiological aspects of larval life, as morphology has already been extensively documented. Changes in biological parameters (for example, rates of feeding, growth, metabolism) are shown in successive developmental stages, within individual stages, and as responses to environmental factors. Particular attention is paid to interrelationships between intrinsic phenomena (molting cycle, organogenesis, growth) and the overlaying effects of extrinsic factors (for example, food, temperature, salinity, pollution). Concluding from the available data, major bias and gaps in present knowledge of larval biology are identified and discussed as to their potential significance in future research.