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Xenobiotic Residues In Louisiana Crayfish Tissues And Their Environs., Jerome D. Madden
Xenobiotic Residues In Louisiana Crayfish Tissues And Their Environs., Jerome D. Madden
LSU Historical Dissertations and Theses
Two commercially important species of Louisiana crayfish, Procambarus clarkii (Girard) and P. acutus acutus (Girard), from the Atchafalaya River Basin and from open ponds, as well as sediment and water from these environs, were sampled at three times during two consecutive fishing (production) seasons. The abdominal muscle and hepatopancreatic tissue were digested with nitric acid; the sediment was dried prior to digestion with hydrofluoric acid and aqua regia; and the water was filtered prior to analysis by inductively coupled plasma emission spectrometry (ICP) for As, Cd, Cu, Cr, Hg, Pb, and Ni. Pb, Hg, and Cd, if present, were in …
Social Organization, Reproductive Behavior, And Zoogeography Of Some Indo-Pacific Hawkfishes (Cirrhitidae)., Terry John Donaldson
Social Organization, Reproductive Behavior, And Zoogeography Of Some Indo-Pacific Hawkfishes (Cirrhitidae)., Terry John Donaldson
LSU Historical Dissertations and Theses
The social organization and reproductive behavior of ten species of hawkfishes was studied at several Pacific localities. In addition, the zoogeography of all Indo-West Pacific cirrhitids was considered in relation to both the Indo-Malayan triangle as a center of species diversity and the isolation of the Pacific and Indian ocean basins during Quaternary events. Patterns of hawkfish distribution and species richness, reflected in high levels of endemism in both the Pacific and Indian ocean basins, support the hypothesis that the Indo-Malayan triangle is not so much a center of speciation as one of the confluence of two distinct centers of …
Bioenergetics Of Red Swamp Crawfish (Procambarus Clarkii) And White River Crawfish (Procambarus Acutus Acutus) In Cultivated, Noncultivated And Wooded Ponds In South Louisiana., Mattana Sanguanruang
Bioenergetics Of Red Swamp Crawfish (Procambarus Clarkii) And White River Crawfish (Procambarus Acutus Acutus) In Cultivated, Noncultivated And Wooded Ponds In South Louisiana., Mattana Sanguanruang
LSU Historical Dissertations and Theses
Stomach content analysis and stable carbon isotope ratios were used to determine diet and food assimilation of red swamp crawfish (Procambarus clarkii) and white river crawfish (Procambarus acutus acutus) in three types of commercial ponds. Crawfish stomachs contained largely macrophytes, detritus and leaf litter, and to a lesser extent aquatic insects and zooplankton. Food habits of P. clarkii and P. acutus acutus were similar, but P. acutus acutus consumed more animal material than did P. clarkii. Food habits were similar among different sizes of P. clarkii and P. acutus acutus. Seasonal stable carbon isotope ratios ($\delta\sp{13}$C) of P. clarkii and …
Processing And Freezing Methods Influencing The Consistency And Quality Of Fresh And Frozen Peeled Crawfish (Procambarus Sp.) Meat., Gail Anne Marshall
Processing And Freezing Methods Influencing The Consistency And Quality Of Fresh And Frozen Peeled Crawfish (Procambarus Sp.) Meat., Gail Anne Marshall
LSU Historical Dissertations and Theses
The production and processing of freshwater crawfish (Procambarus sp.) is an important seafood industry in Louisiana. Year round availability of a consistently high quality product will help maximize marketability of peeled crawfish meat. This study addressed several quality problems associated with fresh and frozen crawfish meat. Fresh, peeled crawfish meat is frequently packaged with hepatopancreas for added flavor in prepared dishes. Sporadic development of mushiness in crawfish meat packed with hepatopancreas was an unpredictable problem for crawfish processors. Hepatopancreatic enzymes were thought to be causing proteoloysis of ice-stored meat. Study results showed significant effects (p $<$ 0.01) of cooking time on the texture of ice-stored meat. Gelatin degradation by hepatopancreas proved to be a good indicator of enzyme activity and adequacy of blanch treatment. A popular preference for red swamp crawfish (P. clarkii) over white river crawfish (P. acutus acutus) is maintained by many processors and consumers. Both species are harvested simultaneously in mixed proportions. Easily recognizable exterior physical characteristics distinguish the two species. Sensory differences of processed tail meat had not been determined. Results showed insignificant differences (p $>$ 0.05) in texture …
Behavioral And Physiological Adaptations Of Largemouth Bass (Micropterus Salmoides) To Low-Salinity Environments., Michael Rogers Meador
Behavioral And Physiological Adaptations Of Largemouth Bass (Micropterus Salmoides) To Low-Salinity Environments., Michael Rogers Meador
LSU Historical Dissertations and Theses
A study of the biology, movements, behavior, and physiology of largemouth bass (Micropterus salmoides) from a low-salinity marsh in Lafourche Parish, Louisiana was conducted from March 1985 to December 1987. Comparative data were also collected for freshwater largemouth bass from Ben Hur Lake and False River, Louisiana. Marsh largemouth bass were small compared to freshwater bass of similar age, although growth rates of older marsh bass equaled or exceeded those of freshwater fish. Marsh bass relative weight indicated excellent condition during all seasons, while freshwater bass exhibited reduced condition in early spring and fall. Characteristic body morphology and growth of …