Investigations On The Gray Snapper Lutjanus Griseus
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Investigations On The Gray Snapper Lutjanus Griseus
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Author : Walter A. Starck
language : en
Publisher:
Release Date : 1971
Investigations On The Gray Snapper Lutjanus Griseus written by Walter A. Starck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Gray snapper categories.
Gray snappers were collected from four different habitats and examined for trematodes. The incidence of each trematode was calculated for each habitat during each season. Intermediate hosts of the trematodes were also collected. It was found that the habitat in which gray snappers reside is more important than their size, sex, or the season of the year in determining the nature of their trematode populations. This may be the result of the intermediate host distribution being regulated by the habitat. Seasonal changes in trematode populations result from fish movements, such as spawning migrations or movements in response to cold water. The differences between the trematode populations of large and small snappers probably are a function of their residing in different habitats and eating different organisms. The sex of gray snappers has no discernable [i.e. discernible] effect on their trematode populations. Metadena obscura sp. n. (Cryptogonimidae) was found in the pyloric caeca and intestine of Lutjanus griseus (Linnaeus). Nine species of trematodes were found in the intestine and pyloric caeca of Lutjanus griseus near Lower Matecumbe Key: Metadena globosa, M. adglobosa, M. obscura, Paracryptogonimus neoamericanus, Hamacreadium mutabile, H. gulella, Helicometrina nimia, Helicometra execta, and Stephanostomum casum.
Ecophysiology Of The Gray Snapper Lutjanus Griseus Salinity Effects On Abundance Physiology And Behavior
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Author : Xaymara M. Serrano
language : en
Publisher:
Release Date : 2008
Ecophysiology Of The Gray Snapper Lutjanus Griseus Salinity Effects On Abundance Physiology And Behavior written by Xaymara M. Serrano and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Mangroves and seagrass beds serve as essential fish habitat for many economically- and ecologically-valuable species. Depending on their location, these shallow-water habitats are often characterized by substantial fluctuation in salinity levels, which can represent a source of osmoregulatory stress for associated organisms. In South Florida, one of the most important fish species that utilizes these habitats is the gray snapper (Lutjanus griseus). Although this species constitutes a significant portion of the region2s total recreational fishery harvest, the effects of salinity on its distribution, physiology and behavior remain poorly understood. The main goal of this thesis was then to investigate the ecophysiological basis of habitat selection by the gray snapper. Specific objectives include to: (1) examine patterns of distribution and abundance across gradients in environmental salinity; (2) measure physiological status and responses to controlled salinity challenges and; (3) conduct behavioral trials to examine for salinity preferenda (if any). To begin investigating if salinity could be a primary factor structuring the gray snapper assemblages, I examined empirical data collected from Biscayne Bay to test the null hypothesis that gray snapper abundances were evenly distributed along the full salinity range at which samples have been collected. Using the delta approach, three abundance metrics (frequency of occurrence, concentration and delta density) were used as an index for the distribution and abundance of this species. Results indicated that abundance patterns for the smaller gray snapper were consistent with a strategy of reducing osmoregulatory costs by selecting intermediate salinities. However, corresponding abundance patterns for subadult gray snapper were inconsistent with this strategy of minimizing energetic costs, suggesting that this life stage may be indifferent to the range of salinities at which they were observed. These patterns helped developed further hypotheses regarding the ecophysiology of juvenile and subadult gray snapper, the latter of which was then tested via laboratory experiments. Subsequently, I challenged fish in the laboratory with six different salinity treatments (0, 5, 30, 50, 60 and 70ppt, including control) for 192 consecutive hours and collected blood samples at different time points. Results indicated that physiological stress to salinity changes is unlikely to occur at a salinity range of 5 to 50 ppt. At salinities of 0 and 60 ppt transient significant changes in plasma osmolality and/or blood haematocrit were observed, but were corrected after an initial adjustment period of approximately 96 hours. At the highest salinity treatment (70 ppt), a constant osmolality could not be maintained, resulting in death for all fish within 48 hours of exposure. Overall, these findings demonstrate the strong euryhalinity and extraordinary tolerance of this species to both extreme hypo- and hypersaline environments. Finally, I investigated the salinity preference and effects on swimming behavior of the gray snapper in an automated salinity choice shuttlebox via 48-hr trials. In general, gray snapper tested displayed either one of two distinctively different salinity preferences. Half of gray snappers displayed a salinity preference in the range of 9-15 ppt, whereas the other half displayed a salinity preference in the range of 19-23 ppt. Recorded swimming speeds in all fish tested reflected a significant, but weak negative linear relationship with salinity during both time periods of the day (light and dark); however, gray snapper were usually most active during the dark period across all salinities. Overall, these findings reveal that gray snapper prefer slightly hyperosmotic salinities that may minimize the physiological costs of osmoregulation compared to extreme salinities.
Population Structure Food Habits And Spawning Activity Of Gray Snapper Lutjanus Griseus In Everglades National Park
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Author : Edward Stevenson Rutherford
language : en
Publisher:
Release Date : 1983
Population Structure Food Habits And Spawning Activity Of Gray Snapper Lutjanus Griseus In Everglades National Park written by Edward Stevenson Rutherford and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Fishes categories.
Generic Essential Fish Habitat Amendment To The Following Fishery Managment Plans Of The Gulf Of Mexico Gom Shrimp Red Drum Reef Fish Stone Crab Coral And Coral Reef Fisheries Of The Gulf Of Mexico Spiny Lobster Fishery And Coastal Migratory Pelagic Resources Of Gom And South Atlantic
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Author :
language : en
Publisher:
Release Date : 2004
Generic Essential Fish Habitat Amendment To The Following Fishery Managment Plans Of The Gulf Of Mexico Gom Shrimp Red Drum Reef Fish Stone Crab Coral And Coral Reef Fisheries Of The Gulf Of Mexico Spiny Lobster Fishery And Coastal Migratory Pelagic Resources Of Gom And South Atlantic written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Fishery Bulletin
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Author :
language : en
Publisher:
Release Date : 2001
Fishery Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Fisheries categories.
Commercial Fisheries Review
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Author :
language : en
Publisher:
Release Date : 1962
Commercial Fisheries Review written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Fish trade categories.
Marine Fisheries Review
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Author :
language : en
Publisher:
Release Date : 1971
Marine Fisheries Review written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Fisheries categories.
Estuarine Research
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Author : L Cronin
language : en
Publisher: Elsevier
Release Date : 1975-01-01
Estuarine Research written by L Cronin and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975-01-01 with Science categories.
Chemistry, Biology, and the Estuarine System is the first volume of a series launched by Estuarine Research Foundation to present information and concepts regarding the estuaries in the world. The contents of this volume are papers presented in a conference held in South Carolina in October 1973. The book is divided into three major subject areas, namely, Chemistry, Biology, and Estuarine System. The first part focuses on the cycling of elements and estuaries. The second part deals with the dynamics of the food webs in various estuaries. The last section discusses the estuarine system, specifically estuarine modeling. In this part, several estuarine models in different locations are explored. Model analysis as well as utility of systems models is covered in this section. This volume serves as a valuable source of information to interested parties in the field of ecology, biology, chemistry, environmental science, etc.
Miscellaneous Paper
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Author : Coastal Engineering Research Center (U.S.)
language : en
Publisher:
Release Date : 1975
Miscellaneous Paper written by Coastal Engineering Research Center (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Coasts categories.
Technical Memorandum U S Army Corps Of Engineers Coastal Engineering Research Center
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Author : Coastal Engineering Research Center (U.S.)
language : en
Publisher:
Release Date : 1964
Technical Memorandum U S Army Corps Of Engineers Coastal Engineering Research Center written by Coastal Engineering Research Center (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Beach erosion categories.
