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Articles 61 - 90 of 151
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Analysis Of Sediment And Gut Contents Of The Sand Dollars Mellita Tenuis, Encope Michelini, And Encope Aberrans Off The Central Florida Gulf Coast, Susan E. Hilber, John M. Lawrence
Analysis Of Sediment And Gut Contents Of The Sand Dollars Mellita Tenuis, Encope Michelini, And Encope Aberrans Off The Central Florida Gulf Coast, Susan E. Hilber, John M. Lawrence
Gulf of Mexico Science
Sand dollars are conspicuous macroinvertebrates on particulate substrates in intertidal and shallow water environments. Their locomotion and feeding can have major effects on the sediment and infauna. We investigated the sediment and gut contents of three species of sand dollars off the central Florida gulf coast. Sediment comprised quartz particles at two sites and mixed quartz particles and carbonate shell hash at the third site. At all sites, gut particles were smaller than those of the sediment. This could have been the result of the teeth of the Aristotle’s lantern crushing the particles. However, particles in the food grooves of …
Roosting Ecology Of Rafinesque's Big-Eared Bat, Corynorhinus Rafinesquii, In Southeastern Mississippi, Austin Webb Trousdale Iii
Roosting Ecology Of Rafinesque's Big-Eared Bat, Corynorhinus Rafinesquii, In Southeastern Mississippi, Austin Webb Trousdale Iii
Dissertations
Rafinesque's big-eared bat, Corynorhinus rafinesquii, is considered rare and/or declining throughout its range. Concrete bridges are potentially important roosts for C. rafinesquii, especially in the Gulf Coastal Plain where the species' natural roosts (caves and large hollow trees) are inherently scarce. Successful efforts to monitor and conserve this species must account for its movements among multiple roosts and determine the duration of its roost use (including bridges) at different temporal scales. Therefore, I investigated roosting ecology of C. rafinesquii from 2000-2005 within a mixed hardwood-pine (Pinus spp.) system in southeastern Mississippi. I conducted surveys of concrete bridges to determine phenological …
Analysis Of Secchi Depths And Light Attenuation Coefficients In The Louisiana-Texas Shelf, Northern Gulf Of Mexico, A. Lugo-Fernández, M. Gravois, T. Montgomery
Analysis Of Secchi Depths And Light Attenuation Coefficients In The Louisiana-Texas Shelf, Northern Gulf Of Mexico, A. Lugo-Fernández, M. Gravois, T. Montgomery
Gulf of Mexico Science
We analyzed Secchi depths (Zs), scalar downwelling irradiance, and transmissometer data collected during 10 cruises that spanned two and one-half years (May 1992-Nov. 1994) over the Louisiana-Texas shelf. The Zs increases from the inner shelf (depths ≤50 m) to the outer shelf and from nonsummer (Zs =10m) to summer (Zs = 14m). These changes in Zs are induced by the shelf's circulation and freshwater input, both of which vary seasonally, i.e., nonsummer to summer. Optical parameters (e.g., Zs), like the circulation, divide the shelf into an inner and outer shelf along the 50-m isobath. The …
A Checklist Of Benthic Marine Algae Of The Coast Of Texas, Michael J. Wynne
A Checklist Of Benthic Marine Algae Of The Coast Of Texas, Michael J. Wynne
Gulf of Mexico Science
A synthesis of the benthic marine algal flora for the Texas coastline is compiled. A total of 208 taxa of benthic macroalgae is presented, including 114 taxa of Rhodophyceae (red algae), 28 taxa of Phaeophyceae (brown algae), and 66 taxa of Ulvophyceae (green algae). These algal taxa are placed in an arrangement according to the most currently accepted schemes of classification, reflecting the results of comparative phylogenetic treatments. Explanatory "Notes" with information on taxonomic and nomenclatural changes are included.
Revision Of The Nonequilibrium Thermal Dissociation And Stringent Washing Approaches For Identification Of Mixed Nucleic Acid Targets By Microarrays, Alex E. Pozhitkov, Robert D. Stedtfeld, Syed A. Hashsham, Peter A. Noble
Revision Of The Nonequilibrium Thermal Dissociation And Stringent Washing Approaches For Identification Of Mixed Nucleic Acid Targets By Microarrays, Alex E. Pozhitkov, Robert D. Stedtfeld, Syed A. Hashsham, Peter A. Noble
Faculty Publications
Microarray experiments typically involve washing steps that remove hybridized nonspecific targets with the purpose of improving the signal- to- noise ratio. The quality of washing ultimately affects downstream analysis of the microarray and interpretation. The paucity of fundamental studies directed towards understanding the dissociation of mixed targets from microarrays makes the development of meaningful washing/ dissociation protocols difficult. To fill the void, we examined activation energies and preexponential coefficients of 47 perfect match ( PM) and double- mismatch ( MM) duplex pairs to discover that there was no statistical difference between the kinetics of the PM and MM duplexes. Based …
Recruitment And Essential Habitat Of Juvenile Sand Seatrout (Cynoscion Arenarius) In Four Estuaries Along The West Coast Of Florida, Caleb H. Purtlebaugh, Kristin R. Rogers
Recruitment And Essential Habitat Of Juvenile Sand Seatrout (Cynoscion Arenarius) In Four Estuaries Along The West Coast Of Florida, Caleb H. Purtlebaugh, Kristin R. Rogers
Gulf of Mexico Science
The sand seatrout (Cynoscion arenarius) is an ecologically and economically important species common to estuarine and nearshore waters of the Gulf of Mexico. Currently, comprehensive information on the essential habitat of juvenile sand seatrout is limited. We analyzed data from a long-term fisheries-independent monitoring program to assess the spatial and temporal distributions of juvenile sand seatrout relative to various habitat parameters in four estuaries (Apalachicola Bay, the Suwannee River estuary, Tampa Bay, and Charlotte Harbor) along the gulf coast of Florida. A total of 25,668 sand seatrout (≤100 mm SL) were collected during monthly stratified-random sampling from Jan. …
Feeding Habits Of Common Snook, Centropomus Undecimalis, In Charlotte Harbor, Florida, David A. Blewett, Rebecca A. Hensley, Philip W. Stevens
Feeding Habits Of Common Snook, Centropomus Undecimalis, In Charlotte Harbor, Florida, David A. Blewett, Rebecca A. Hensley, Philip W. Stevens
Gulf and Caribbean Research
We examined the feeding habits, ontogenetic and seasonal diet variations, and predator size–prey size relationships of common snook, Centropomus undecimalis, in Charlotte Harbor, Florida, through stomach contents analysis. A total of 694 stomachs were extracted from common snook (300–882 mm standard length [SL]) during a 24-month period (March 2000–February 2002); 432 stomachs contained prey items. At least 37 prey taxa were identified, including 19 that had not been previously reported. Fishes made up 71% of the prey by number and 90% by weight. Three prey items made up almost 50% of the diet numerically—Lagodon rhomboides, Anchoa spp., …
Rationale For A New Generation Of Indicators For Coastal Waters, Gerald Niemi, Denice Wardrop, Robert Brooks, Susan Anderson, Valerie Brady, Hans Paerl, Chet Rakocinski, Marius Brouwer, Barbara Levinson, Michael Mcdonald
Rationale For A New Generation Of Indicators For Coastal Waters, Gerald Niemi, Denice Wardrop, Robert Brooks, Susan Anderson, Valerie Brady, Hans Paerl, Chet Rakocinski, Marius Brouwer, Barbara Levinson, Michael Mcdonald
Faculty Publications
More than half the world'S human population lives within 100 km of the coast, and that number is expected to increase by 25% over the next two decades. Consequently, coastal ecosystems are at serious risk. Larger coastal populations and increasing development have led to increased loading of toxic substances, nutrients and pathogens with subsequent algal blooms, hypoxia, beach closures, and damage to coastal fisheries. Recent climate change has led to the rise in sea level with loss of coastal wetlands and saltwater intrusion into coastal aquifers. Coastal resources have traditionally been monitored on a stressor-by-stressor basis such as for nutrient …
Spatial Patterns Of Estuarine Habitat Type Use And Temporal Patterns In Abundance Of Juvenile Permit, Trachinotus Falcatus, In Charlotte Harbor, Florida, Aaron J. Adams, David A. Blewett
Spatial Patterns Of Estuarine Habitat Type Use And Temporal Patterns In Abundance Of Juvenile Permit, Trachinotus Falcatus, In Charlotte Harbor, Florida, Aaron J. Adams, David A. Blewett
Gulf and Caribbean Research
The life history of many marine fishes is a 2-phase cycle: juveniles and adults make up a demersal phase, whereas larvae are planktonic. Determining ontogenetic patterns of habitat type use of the demersal phase has important management and habitat conservation implications for species that use coastal habitat types as juveniles. Juvenile permit, Trachinotus falcatus, are presumed to be limited to beaches exposed to open ocean, but few studies have addressed juvenile permit use of estuarine habitat types. Ten years of fisheries-independent monitoring data from a subtropical estuary were analyzed to determine habitat type use patterns and seasonality of juvenile …
Trophic Comparison Of Two Species Of Needlefish (Belonidae) In The Alvarado Lagoonal System, Veracruz, Mexico, Daniel Arceo-Carranza, Jonathan Franco-Lopez, Gretchen L. Waggy, Rafael Chavez-Lopez
Trophic Comparison Of Two Species Of Needlefish (Belonidae) In The Alvarado Lagoonal System, Veracruz, Mexico, Daniel Arceo-Carranza, Jonathan Franco-Lopez, Gretchen L. Waggy, Rafael Chavez-Lopez
Gulf and Caribbean Research
We compared the diets of Atlantic needlefish, Strongylura marina, and redfin needlefish, Strongylura notata, in the Alvarado lagoonal system, Veracruz, Mexico, and analyzed diet breadth and trophic overlap between the species. All fishes were collected monthly from June 2000 to July 2001 at twelve sampling stations. A total of 74 intestinal tracts from S. marina were analyzed. The diet of S. marina consisted of 25 prey types with fish being the dominate prey. In eighty-nine digestive tracts examined from S. notata, the diet consisted of 29 prey types with the dominant prey including fishes, penaeid shrimp, polychaetes, …
Reproductive Structures And Early Life History Of The Gulf Toadfish, Opsanus Beta, In The Tecolutla Estuary, Veracruz, Mexico, Alfredo Gallardo-Torres, Jose Antonio Martinez-Perez, Brian J. Lezina
Reproductive Structures And Early Life History Of The Gulf Toadfish, Opsanus Beta, In The Tecolutla Estuary, Veracruz, Mexico, Alfredo Gallardo-Torres, Jose Antonio Martinez-Perez, Brian J. Lezina
Gulf and Caribbean Research
Although the Gulf toadfish, Opsanus beta, is an abundant member of the nearshore Gulf of Mexico ichthyofaunal assemblage, little information exists regarding the ecology of the species, especially for southern Gulf of Mexico populations. We added to the existing knowledge of this species by describing the reproductive structures and examining the early life history of this species in the Tecolutla estuary, Mexico. Macro- and microscopic examination of 7 males showed spermatogenesis to be similar to other teleost species except for the occurrence of biflagellate spermatozoa. Histological examination of the male accessory gland showed 3 tissue layers, but their functions …
Salinity Tolerance Of Two Gobies (Microgobius Gulosus, Gobiosoma Robustum) From Florida Bay (Usa), Pamela J. Schofield
Salinity Tolerance Of Two Gobies (Microgobius Gulosus, Gobiosoma Robustum) From Florida Bay (Usa), Pamela J. Schofield
Gulf of Mexico Science
No abstract provided.
Connectivity Between Coastal Habitats Of Two Oceanic Caribbean Islands As Inferred From Ontogenetic Shifts By Coral Reef Fishes, I. Nagelkerken, G. Van Der Velde
Connectivity Between Coastal Habitats Of Two Oceanic Caribbean Islands As Inferred From Ontogenetic Shifts By Coral Reef Fishes, I. Nagelkerken, G. Van Der Velde
Gulf and Caribbean Research
Mangroves and seagrass beds are considered important nursery habitats for juveniles of coral reef fishes. Studies have mostly focused on the fish community of just one habitat, so the connectivity between different coastal habitats is often unclear. In this study, density and size of reef fish were determined using a single sampling technique in four non-estuarine bay habitats and four reef zones in Curaçao and Bonaire (Netherlands Antilles). The data indicate that of the complete reef fish community at least 21 species show ontogenetic crossshelf shifts in habitat utilization. The 21 species mainly utilized shallow-water habitats (mangroves, seagrass beds, channel …
Feeding Ecology Of The Blackwing Searobin Prionotus Rubio (Jordan, 1886) Over The Western Continental Shelf Off Alvarado, Veracruz, Mexico, Victor H. Cruz-Escalona, L. Andres Abítia-Cárdenas, Lucia Campos-Dávila, Felipe Galvan-Magaña
Feeding Ecology Of The Blackwing Searobin Prionotus Rubio (Jordan, 1886) Over The Western Continental Shelf Off Alvarado, Veracruz, Mexico, Victor H. Cruz-Escalona, L. Andres Abítia-Cárdenas, Lucia Campos-Dávila, Felipe Galvan-Magaña
Gulf of Mexico Science
Seasonal changes of food habits of the blackwing searobin Prionotus rubio were studied over the continental shelf off Alvarado, Veracruz, Mexico, from Sept. 1994 to Aug. 1995. A total of 234 stomachs (182 with identifiable food) were analyzed. Brown shrimp Farfantopenaeus aztecus, blue crab Portunus spinicarpus, and rock shrimp Sicyonia dorsalis were the main dietary items. Low values of prey diversity and dietary breadth suggest the main prey were always relatively abundant over the western continental shelf of the Gulf of Mexico. We concluded the blackwing searobin is part of a trophic guild of demersal marine fish that …
Diet Composition Of Juvenile Pigfish, Orthopristis Chrysoptera (Perciformes: Haemulidae), From The Northern Gulf Of Mexico, Jeffrey C. Howe
Diet Composition Of Juvenile Pigfish, Orthopristis Chrysoptera (Perciformes: Haemulidae), From The Northern Gulf Of Mexico, Jeffrey C. Howe
Gulf of Mexico Science
Diets of 954 juvenile pigfish, Orthopristis chrysoptera, collected from 14 1-m3 concrete block artificial reefs approximately 20 km south of Mobile Bay, AL, were examined. A total of 137 specimens (14.4 %) contained food items and were used to perform stomach content analysis. Index of Relative Importance was used to evaluate the contribution of major foods by combining frequency of occurrence, volume, and number. Diets were dominated by shrimps and polychaetes and, to a much lesser extent, sea anemones, fishes, crustaceans, cephalopods, and gammarids. Many stomachs contained various quantities of sand, which indicated a certain amount of bottom …
Abundance, Spatial Distribution, And Mortality Of Young-Of-The-Year Spotted Seatrout (Cynoscion Nebulosus) Along The Gulf Coast Of Florida, Gary A. Nelson, Deborah Leffler
Abundance, Spatial Distribution, And Mortality Of Young-Of-The-Year Spotted Seatrout (Cynoscion Nebulosus) Along The Gulf Coast Of Florida, Gary A. Nelson, Deborah Leffler
Gulf of Mexico Science
We used fixed-station and random-station sampling data from the period 1989-97 to examine spatial and temporal patterns in the abundance and size structure of young-of-the-year (YOY) spotted seatrout, Cynoscion nebulosus, in three Florida estuaries. YOY seatrout first appeared at shallow-water (<1.5 m) seine sites in May-June in Choctawhatchee Bay (Florida Panhandle) and in April-May in Tampa Bay and Charlotte Harbor (both along the southwest Florida peninsula). Spotted seatrout were caught at deepwater (> 1.6 m) trawl stations within 1-3 mo of their initial appearance at shallow-water sites. Most spotted seatrout were caught in waters <3.7 m. Spring and summer peal's in YOY abundance, corresponding to strong influxes of newly spawned individuals, were observed only in southwest peninsula estuaries. Depending on the estuary, the occurrence of YOY spotted seatrout at shallow-water sites was associated with some combination of seagrasses, mangroves, salinity, depth, temperature, and mud. Estimates of total instantaneous mortality rates for YOY spotted seatrout in Tampa Bay were 0.027·d-1 for fixed sites and to 0.025·d-1 for randomly selected sites.
Onshore–Offshore Trends In The Size-Frequency Distribution Of Death Assemblages: Northwestern Gulf Of Mexico, George M. Staff, Eric N. Powell
Onshore–Offshore Trends In The Size-Frequency Distribution Of Death Assemblages: Northwestern Gulf Of Mexico, George M. Staff, Eric N. Powell
Gulf of Mexico Science
The size-frequency distributions of death assemblages were compared at three sites on the inner continental shelf of Texas by means of three descriptor variables, numerical abundance, paleoproduction (biomass at death), and paleoingestion (lifetime ingestion, a measure of energy flow). These death assemblages were then compared with six other death assemblages covering a transect from the estuary (Copano Bay, TX) to the continental slope. Typically, size-frequency distributions are based on abundance and size classes are set proportional to the largest individual in the collection. Restriction to this one analysis would have identified few of the important trends observed in this study. …
Feeding Habits Of Juvenile Lane Snapper Lutjanus Synagris From Mississippi Coastal Waters, With Comments On The Diet Of Gray Snapper Lutjanus Griseus, James S. Franks, Katherine E. Vanderkooy
Feeding Habits Of Juvenile Lane Snapper Lutjanus Synagris From Mississippi Coastal Waters, With Comments On The Diet Of Gray Snapper Lutjanus Griseus, James S. Franks, Katherine E. Vanderkooy
Gulf and Caribbean Research
Stomach contents analysis was used to quantitatively describe the diets of juvenile lane snapper, Lutjanus synagris, and juvenile gray snapper, Lutjanus griseus, from the northern Gulf of Mexico. Juvenile snapper were collected by trawling at two estuarine, deep channel sites in Mississippi coastal waters from September 1996 to January 1997. Lane snapper (n = 53) and gray snapper (n = 12) both consumed a variety of prey organisms, but primary prey were amphipods, decapods (shrimp and crabs), and fishes. The most important prey items for lane snapper based on percent Index of Relative Importance (%IRI) were shrimp remains …
Spatio-Temporal Distribution Of Larval Gobiosoma Bosc In Waters Adjacent To Natural And Altered Marsh-Edge Habitats Of Mississippi Coastal Waters, J. Read Hendon, Mark S. Peterson, Bruce H. Comyns
Spatio-Temporal Distribution Of Larval Gobiosoma Bosc In Waters Adjacent To Natural And Altered Marsh-Edge Habitats Of Mississippi Coastal Waters, J. Read Hendon, Mark S. Peterson, Bruce H. Comyns
Faculty Publications
Larval naked gobies, Gobiosoma bose, were collected monthly from October 1995 to September 1997 by beam plankton trawl from waters adjacent to natural Juncus/Spartina marsh-edge, natural sandy beach and altered Juncus/Spartina marsh-edge habitats in Mississippi coastal waters. Altered marsh habitats consisted of two bulkheaded stations and one stretch of riprap. Abundances were significantly higher in waters adjacent to natural marsh-edge habitats than in those adjacent to altered habitats in year one (P = 0.011), suggesting that the physical nature of alteration may have caused reduced habitat suitability. Abundances also varied seasonally, with summer conditions of high water temperature, increasing tide …
Food Resource Utilization In The Sea Urchin Lytechinus Variegatus In Contrasting Shallow-Water Microhabits Of Saint Joseph Bay, Florida, Stephen D. Beddingfield, James B. Mcclintock
Food Resource Utilization In The Sea Urchin Lytechinus Variegatus In Contrasting Shallow-Water Microhabits Of Saint Joseph Bay, Florida, Stephen D. Beddingfield, James B. Mcclintock
Gulf of Mexico Science
The feeding activity and relative percentages of different foods consumed by the regular sea urchin Lytechinus variegatus in three contrasting microhabitats were examined over a 2-yr period in Saint Joseph Bay, FL, at its northern limits of distribution. In 1993, feeding activity levels of individuals at a site dominated by the seagrass Thalassia testudinum were higher on average than at a site characterized mostly by sand substrates alone or a site dominated by the seagrass Syringodium filiforme. No other significant difference in feeding activity levels was detected between sites or years. Feeding activity was markedly reduced at all sites …
An Experimental Reef Program To Test Designs Of An Artificial Reef For Kelp Mitigation, Larry Deysher, Thomas A. Dean, Robert Grove, Andy Jahn
An Experimental Reef Program To Test Designs Of An Artificial Reef For Kelp Mitigation, Larry Deysher, Thomas A. Dean, Robert Grove, Andy Jahn
Gulf of Mexico Science
An artificial reef is being planned to mitigate alleged losses of giant kelp and the invertebrate and fish communities associated with a kelp bed. The project's first step was to initiate comprehensive siting and design studies. A 25-yr time series of kelp surface canopy maps for a 100 km reach of coastline was entered into a GIS database and analyzed in conjunction with geotechnical and human-use information to define ecologically favorable and acceptable sites in the general area. A site was chosen near an area that appeared most promising in the primary study area. This study's field work determined that …
Factors Associated With Artificial-Reef Fish Assemblages, Stephen A. Bortone, Robert K. Turpin, Richard C. Cody, Charles M. Bundrick, Ronald L. Hill
Factors Associated With Artificial-Reef Fish Assemblages, Stephen A. Bortone, Robert K. Turpin, Richard C. Cody, Charles M. Bundrick, Ronald L. Hill
Gulf of Mexico Science
Visual census (5-min point-count, 100 m2) was used to estimate fish assemblage parameters associated with artificial reef variables from 64 reefs over a 3-yr period in the northern Gulf of Mexico. Dependent variables, recorded by divers [i.e., number of species, number of individuals, length (TL in cm), and species diversity (H')], were analyzed for their associations with potentially underlying environmental attributes using stepwise regression, TWINSPAN, and canonical correspondence analyses (CCA). The fish assemblages (dominated by haemulids, labrids, and serranids) were qualitatively and quantitatively similar to the assemblages described by others from the same general area. Pelagic fishes (carangids …
Salinity Tolerance Of Four Ecologically Distinct Species Of Fundulus (Pisces: Fundulidae) From The Northern Gulf Of Mexico, Gregory J. Crego, Mark S. Peterson
Salinity Tolerance Of Four Ecologically Distinct Species Of Fundulus (Pisces: Fundulidae) From The Northern Gulf Of Mexico, Gregory J. Crego, Mark S. Peterson
Gulf of Mexico Science
No abstract provided.
Observations On Mass Mortalities Of The Sooty Eel, Bascanichthys Bascanium, And The Speckled Worm Eel, Myrophis Punctatus, Associated With A Fish Kill In The Mississippi Sound, James S. Franks, Ross P. Dodds
Observations On Mass Mortalities Of The Sooty Eel, Bascanichthys Bascanium, And The Speckled Worm Eel, Myrophis Punctatus, Associated With A Fish Kill In The Mississippi Sound, James S. Franks, Ross P. Dodds
Gulf and Caribbean Research
Mass mortalities of the sooty eel, Bascanichthys bascanium, and the speckled worm eel, Myrophis punctatus, were observed in association with a fish kill which occurred the morning of 18 June 1994 on the south shore of Deer Island, a nearshore barrier island located off Biloxi, Mississippi. B. bascanium and M. punctatus, as well as other fishes, were found dead and dying near the shore in reddish-brown water and along a lengthy stretch of fringing sandy beach. Both species of eels are infrequently reported from Mississippi waters but were the most abundant fishes recorded from the kill. A …
Partial Life History Of Southern Hogchokers, Trinectes Maculatus Fasciatus, In The Back Bay Of Biloxi, Mississippi, Tanya L. Peterson-Curtis
Partial Life History Of Southern Hogchokers, Trinectes Maculatus Fasciatus, In The Back Bay Of Biloxi, Mississippi, Tanya L. Peterson-Curtis
Gulf of Mexico Science
To address life history variation between hogchoker subspecies, length-weight relationships, length conversion factors, back-calculated lengths at age, and female age at maturity were determined for a southern hogchoker population in the northern Gulf of Mexico. Length-weight relationships of female and male hogchokers differed (P < 0.05) only when the regression was based on total lengths. The standard length (SL)-weight equation was W = 0.000022·L3.136. Individuals of the southern population are more robust than those of the northern form, yet have similar SL-TL conversion factors. Otolith annuli were validated, with annuli forming between June and July. The age structure ranged from 1 to 5 yr, with the average SL at age 1 being 21.14 mm. Growth rates appear relatively …
Foods Of Juvenile Spotted Seatrout In Seagrasses At Seahorse Key, Florida, William T. Mason Jr., Scott A. Zengel
Foods Of Juvenile Spotted Seatrout In Seagrasses At Seahorse Key, Florida, William T. Mason Jr., Scott A. Zengel
Gulf of Mexico Science
Early juvenile [ <1 yr; 10-100 mm total length (TL)] spotted seatrout in the shallow seagrasses at Seahorse Key, Florida, in the Northeast Gulf of Mexico, fed on 12 kinds of foods. Although the total diversity of major food items of juvenile seatrout is about the same as 50 years ago, for some unexplained reasons, the juvenile diets have apparently switched to other invertebrate species and to small fish. The 10-30 mm TL seatrout ate small Crustacea, e.g., amphipods and grass shrimps, and fed mostly in the Halodule seagrass zone (average depth 0.5 m). In addition to these species, the 50-80 mm TL seatrout, feeding primarily in the Halodule and Thalassia (average depth 0.8 m) zones, consumed copepods, a combination of decapod shrimps (Mysidopsis bahia, Palaemonetes pugio, P. vulgaris, Periclimenes longicaudatus, Penaeus duorarum), and small fish. Seatrout of 80-100 mm TL appeared to feed only in Thalassia, and larger juveniles (not collected) probably fed in the mixed-grass zone beyond our study area (>1 m depth). Seatrout food resources at the Keys were robust. Peak densities and diversities of hyperbenthic invertebrates in the seagrasses were inversely proportional (maximum average number of individuals = 12,000/sled trawl, Sep.; maximum average number of taxa = 35 spp., March).
Atlantic Spotted Dolphins (Stenella Frontalis) In The Gulf Of Mexico, Lisa R. Mills, Kevin R. Rademacher
Atlantic Spotted Dolphins (Stenella Frontalis) In The Gulf Of Mexico, Lisa R. Mills, Kevin R. Rademacher
Gulf of Mexico Science
No abstract provided.
Notes On The Occurrence Of Guavina Guavina (Pisces: Eleotridae) In East Central Florida: First North American Continental Record, D. Scott Taylor
Notes On The Occurrence Of Guavina Guavina (Pisces: Eleotridae) In East Central Florida: First North American Continental Record, D. Scott Taylor
Gulf of Mexico Science
No abstract provided.
Food Of Cobia, Rachycentron Canadum, From The Northcentral Gulf Of Mexico, Gabriele H. Meyer, James S. Franks
Food Of Cobia, Rachycentron Canadum, From The Northcentral Gulf Of Mexico, Gabriele H. Meyer, James S. Franks
Gulf and Caribbean Research
The stomach contents of 403 cobia, Rachycentron canadum, caught in the northcentral Gulf of Mexico recreational fishery from April through October of 1987-1990 were examined. Cobia ranged from 373-1,530 mm in fork length. Of the 403 stomachs, 287 (71.2%) contained at least one identifiable prey taxon. Crustaceans, consisting primarily of portunid crabs, were the predominant food. Crustaceans occurred in 79.1% of the stomachs and comprised 77.6% of the total number of identifiable prey. The second most important prey category was fish which was dominated by hardhead catfish, Arius felis, and eels. Fish occurred in 58.5% of the stomachs …
Reproductive Strategies In A Population Of Gobiosoma Bosci (Osteichthyes: Gobiidae) With Slow And Fast Maturing Individuals, Candace H. Conn, David L. Bechler
Reproductive Strategies In A Population Of Gobiosoma Bosci (Osteichthyes: Gobiidae) With Slow And Fast Maturing Individuals, Candace H. Conn, David L. Bechler
Gulf and Caribbean Research
The reproductive biology of Gobiosoma bosci collected from November 1986 to October 1987 in the McFaddin Wildlife Refuge in southeast Texas was studied by using morphometric data. Males achieved greater weights per unit length than females, and longevity was about 12 to 13 months. GSI values and mean monthly ovum diameters indicated that the breeding season ran from April to September, with a major activity peak in May and a minor peak in September. Significant differences in male and female standard lengths (SL), ovum diameter, and egg number existed for sexually mature specimens between the first and second peaks of …