An Investigation Into the Epizootiology of Hematodinium Perezi, a Parasitic Dinoflagellate in the Blue Crab, Callinectes Sapidus PDF Download
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Author: Jeffrey David Shields Publisher: ISBN: Category : Callinectes Languages : en Pages : 0
Book Description
Hematodinium perezi is a lethal parasitic dinoflagellate that lives in the hemolymph of brachyuran crabs. The parasite is found along the eastern seaboard of the USA where it occurs in epizootics in the commercially important blue crab, Callinectes sapidus. Crab mortalities associated with the disease occur in high salinity waters, typically in poorly draining estuaries. The parasite is prevalent in the seaside bays of the Delmarva Peninsula in the spring and fall, and spreads to the lower reaches of Chesapeake Bay in the fall. In October 1996, the prevalence of the disease along the Virginia portion of the Delmarva Peninsula varied from 20 - 50% in legal crabs. Lower prevalences (1-10%) were noted for crabs caught between Cape Henry and Cape Charles, i.e., the mouth of the bay. In November, the prevalence of the disease was notably higher in crabs caught between Cape Henry and Cape Charles (10-30%). The disease can spread into the breeding grounds of adult female crabs, but its prevalence is generally low during the prebreeding and ovigerous season. In Spring and Fall, 1997, the disease had a higher prevalence in the coastal bays and creeks. Infected crabs frequently show signs of weakness and lethargy, and often die due to stress-related handling from fishing. The parasite proliferates to extremely high densities in the host (up to 100 million parasites/ml of hemolymph) over 3 to 6 weeks. The hemolymph undergoes radical changes as evinced by its lack of clotting ability, and marked discoloration. Hemolymph levels of total proteins and acid phosphatase activity change with infection, and indicate a gradual decline in the hosts metabolic resources. The effects of other species of Hematodinium on several crab and lobster fisheries, and data from the present study indicate that H. perezi may have a significant impact on the coastal blue crab fisheries along the Atlantic seaboard of the USA.
Author: Jeffrey David Shields Publisher: ISBN: Category : Callinectes Languages : en Pages : 0
Book Description
Hematodinium perezi is a lethal parasitic dinoflagellate that lives in the hemolymph of brachyuran crabs. The parasite is found along the eastern seaboard of the USA where it occurs in epizootics in the commercially important blue crab, Callinectes sapidus. Crab mortalities associated with the disease occur in high salinity waters, typically in poorly draining estuaries. The parasite is prevalent in the seaside bays of the Delmarva Peninsula in the spring and fall, and spreads to the lower reaches of Chesapeake Bay in the fall. In October 1996, the prevalence of the disease along the Virginia portion of the Delmarva Peninsula varied from 20 - 50% in legal crabs. Lower prevalences (1-10%) were noted for crabs caught between Cape Henry and Cape Charles, i.e., the mouth of the bay. In November, the prevalence of the disease was notably higher in crabs caught between Cape Henry and Cape Charles (10-30%). The disease can spread into the breeding grounds of adult female crabs, but its prevalence is generally low during the prebreeding and ovigerous season. In Spring and Fall, 1997, the disease had a higher prevalence in the coastal bays and creeks. Infected crabs frequently show signs of weakness and lethargy, and often die due to stress-related handling from fishing. The parasite proliferates to extremely high densities in the host (up to 100 million parasites/ml of hemolymph) over 3 to 6 weeks. The hemolymph undergoes radical changes as evinced by its lack of clotting ability, and marked discoloration. Hemolymph levels of total proteins and acid phosphatase activity change with infection, and indicate a gradual decline in the hosts metabolic resources. The effects of other species of Hematodinium on several crab and lobster fisheries, and data from the present study indicate that H. perezi may have a significant impact on the coastal blue crab fisheries along the Atlantic seaboard of the USA.
Author: Andrew F. Rowley Publisher: Oxford University Press ISBN: 0192595431 Category : Science Languages : en Pages : 624
Book Description
Many invertebrates are serious pests of agriculture (e.g., mites and locusts), vectors of disease (e.g., mosquitoes and aquatic snails) and venomous (e.g., scorpions), whilst others are beneficial to humans as pollinators, food sources, and detritivores. Despite their obvious ecological, medical, and economic importance, this is the first comprehensive review of invertebrate diseases to be available within a single volume. Concurrent molecular and bioinformatics developments over the last decade have catalysed a renaissance in invertebrate pathology. High-throughput sequencing, handheld diagnostic kits, and the move to new technologies have rapidly increased our understanding of invertebrate diseases, generating a large volume of fundamental and applied research on the topic. An overview is now timely and this authoritative work assembles an international team of the leading specialists in the field to review the main diseases and pathologic manifestations of all the major invertebrate groups. Each chapter adopts a common plan in terms of its scope and approach to achieve a succinct and coherent synthesis. Invertebrate Pathology is aimed at graduate students and researchers in the fields of disease ecology, invertebrate biology, comparative immunology, aquaculture, fisheries, veterinary science, evolution, and conservation. It will be particularly useful for readers new to the field as well as a broader interdisciplinary audience of practitioners and resource managers.
Author: Donald C. Behringer Publisher: Oxford University Press, USA ISBN: 0198821638 Category : Science Languages : en Pages : 280
Book Description
Whether through loss of habitat or cascading community effects, diseases can shape the very nature of the marine environment. Despite their significant impacts, studies of marine diseases have tended to lag behind their terrestrial equivalents, particularly with regards to their ecological effects. However, in recent decades global research focused on marine disease ecology has expanded at an accelerating rate. This is due in part to increases in disease emergence across many taxa, but can also be attributed to a broader realization that the parasites responsible for disease are themselves important members of marine communities. Understanding their ecological relationships with the environment and their hosts is critical to understanding, conserving, and managing natural and exploited populations, communities, and ecosystems. Courses on marine disease ecology are now starting to emerge and this first textbook in the field will be ideally placed to serve them. Marine Disease Ecology is suitable for graduate students and researchers in the fields of marine disease ecology, aquaculture, fisheries, veterinary science, evolution and conservation. It will also be of relevance and use to a broader interdisciplinary audience of government agencies, NGOs, and marine resource managers.
Author: Bradley G. Stevens Publisher: CRC Press ISBN: 1439855420 Category : Nature Languages : en Pages : 624
Book Description
With species existing in all subpolar seas, king crabs are one of the most valuable seafoods. Major fluctuations in their abundance have stimulated a flurry of research and a rapid expansion of the scientific literature in the last decade. King Crabs of the World: Biology and Fisheries Management consolidates extensive knowledge on the biology, sys
Author: Bruce Phillips Publisher: John Wiley & Sons ISBN: 0470995955 Category : Technology & Engineering Languages : en Pages : 528
Book Description
Lobsters are one of the most commercially important groups of animals harvested and farmed throughout the world. Bringing high prices on the market and the table, the results and yields of farmed species has seen continued growth. Under the Editorship of Bruce Phillips an international team of authors provide exhaustive coverage of these fascinating creatures, stretching from growth and development to management and conservation, providing the reader with: Key information for lobster farmers and harvesters Organisation of the species by genera for ease of use Coverage of parasites, pathogens and commensals; their impact, detection and measurement Fisheries scientists, aquaculture personnel, aquatic and invertebrate biologists, physiologists, ecologists, marine biologists and environmental biologists will all find this a vital source of reference. Libraries in universities and research establishments where biological and life sciences and fisheries and aquaculture are studied and taught will find it a valuable addition to their shelves.
Author: Jeffrey David Shields
Author: Jeffrey David Shields
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Author: John M Tiggelaar (II.)
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Author: Andrew F. Rowley
Author: Katrina M. Pagenkopp Lohan
Author: Donald C. Behringer
Author: Bradley G. Stevens
Author: Bruce Phillips