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Articles 1 - 30 of 81
Full-Text Articles in Life Sciences
Biology And Management Of River Herring And Shad In Virginia : Completion Report 1974-1976, Joseph G. Loesch, William H. Kriete Jr.
Biology And Management Of River Herring And Shad In Virginia : Completion Report 1974-1976, Joseph G. Loesch, William H. Kriete Jr.
Reports
This presentation is the final report for the 3-year segment 1974 to 1976 and is also the annual report for the contract period 1 October 1975 to 30 September 1976. It is the ninth report for the continuing VIMS investigations of river herring and shad in Chesapeake Bay. Previous 3-year completion reports were presented in 1970 and 1973.
Marine Financing, Jon A. Lucy
A Survey In The Lafayette River For Oysters, Clams, And Shell In The Vicinity Of The Proposed Granby Street Bridge., Dexter S. Haven, James P. Whitcomb, Paul C. Kendall
A Survey In The Lafayette River For Oysters, Clams, And Shell In The Vicinity Of The Proposed Granby Street Bridge., Dexter S. Haven, James P. Whitcomb, Paul C. Kendall
Reports
The purposes of this study are: 1) to survey populations of oysters, clams, and shells in the immediate vicinity of the site of the proposed Granby Street Bridge in the Lafayette River, Virginia; .2) to evaluate the present and future potential of the area for shellfish culture; and, 3) to estimate the value of the existing stocks of shellfish.
Parasites Of California Marine And Estuarine Fish, Milton S. Love, Mike Moser
Parasites Of California Marine And Estuarine Fish, Milton S. Love, Mike Moser
Harold W. Manter Laboratory of Parasitology: Faculty and Staff Publications
While working on the parasites of several California marine fish, it was difficult to find out which parasites had been reported from our fish. Pertinent sources were scattered over a number of journals, covering many years. We compiled this list because we felt there was a need for a single source which would give all the parasites infecting California marine fish. As "marine fish" was a somewhat vague term, we decided to use it in a broad sense and included estuarine and anadromous fish in the survey. In addition, we have included records from landlocked populations of anadromous fish, such …
Cancer Crabs: Aids To Identification, Paul A. Haefner Jr.
Cancer Crabs: Aids To Identification, Paul A. Haefner Jr.
Reports
No abstract provided.
Investigations Of The Ichthyofauna Of Nicaraguan Lakes: Frontmatter
Investigations Of The Ichthyofauna Of Nicaraguan Lakes: Frontmatter
Investigations of the Ichthyofauna of Nicaraguan Lakes
Dedication
Commentary on this Compendium
Preface
Acknowledgments
Contributors
Contents
Geography Of Lake Nicaragua, Jaime Incer
Geography Of Lake Nicaragua, Jaime Incer
Investigations of the Ichthyofauna of Nicaraguan Lakes
The area surrounding Lake Nicaragua is discussed from the standpoints of its history, geological setting, climate and vegetation. A physical description of the lake itself is given, including the nature of its bottom, its shoreline, its islands and volcanoes.
Limnology Of The Great Lakes Of Nicaragua, Gerald A. Cole
Limnology Of The Great Lakes Of Nicaragua, Gerald A. Cole
Investigations of the Ichthyofauna of Nicaraguan Lakes
For more than a century, the two largest bodies of water in Nicaragua, Lake Nicaragua and its smaller companion, Managua, have engaged naturalists from several disciplines. Perhaps their appeal has been as curiosities because of the occurrence of fish with marine affinities in the larger lake, especially a dangerous shark. The charm has been in Nicaragua or Cocibolca, rather than Managua, properly called Xolotlán. Even though the latter is saltier, it has no elasmobranchs or tarpons.
The lakes, and specifically the larger, cover the greatest expanse of any body of water between Lake Titicaca, Bolivia-Peru, and the Laurentian …
Some Remarks On The Fecundity Of Tilapia (T. Mossambica Peters) And Its Introduction Into Middle Central America (Nicaragua) Together With A First Contribution Towards The Limnology Of Nicaragua, Dietmar Riedel
Investigations of the Ichthyofauna of Nicaraguan Lakes
a. This paper presents an account of fecundity studies into T. mossambica under Middle Central American conditions and limnological investigations into Lake Moyua/Nicaragua which have been performed during 1961/62.
b. Data obtained as to fecundity of T. mossambica are discussed in the light of the term prolificy and with regard to ecological and biological characteristics of Nicaraguan waters and native fish fauna.
c. A more detailed contemplation about the possible effects of a spread out or transplantation of T. mossambica into other Nicaraguan waters concludes the paper.
Bottom Sediments Of Lake Nicaragua And Lake Managua, Western Nicaragua, Frederick M. Swain
Bottom Sediments Of Lake Nicaragua And Lake Managua, Western Nicaragua, Frederick M. Swain
Investigations of the Ichthyofauna of Nicaraguan Lakes
Lakes Nicaragua and Managua are large, rather shallow, fresh-water bodies that lie in a late Tertiary and Quaternary graben in western Nicaragua.
The bottom sediments comprise highly organic diatomaceous volcanic silts and clays in which quartz plagioclase feldspar, dioctahedral montmorillonite and volcanic glass are the principal constituents.
Organic nitrogen content of the lake sediments ranges from 0.3-1.2 percent, about the same range as in eutrophic lakes of higher latitudes. Bitumen content is rather low, much like that of oligotrophic lakes. Hydrocarbon fractions of bitumens are similar in amount to an alkaline lake of western U. S. Non-hydrocarbon bitumens are high …
Ichthyology Of The Lakes Of Nicaragua: Historical Perspective, Jaime Villa
Ichthyology Of The Lakes Of Nicaragua: Historical Perspective, Jaime Villa
Investigations of the Ichthyofauna of Nicaraguan Lakes
Scientific study of Nicaraguan freshwater fishes did not begin until Gunther described the first species from Lake Nicaragua in 1864, but actual accounts of several interesting fishes were written as early as the sixteenth century by the first historians of the New World. These accounts ranged from hearsay to rather detailed (for their time) descriptions and first-hand observations on the form and life of some species. In some cases these observations or conclusions have been doubted for many decades but confirmed and elaborated in recent years. Therefore I believe it may be of interest to examine the early chronicles.
Una Teoría Sobre El Origen De Los Peces De Xiloà, Jaime Villa
Una Teoría Sobre El Origen De Los Peces De Xiloà, Jaime Villa
Investigations of the Ichthyofauna of Nicaraguan Lakes
A finales de 1965 v en conexion con estudios en curso sobre la herpetolog( a nicaragiiense colec te una pequena serie de peces de la Laguna de Xiloa que revelaron aspectos interesantes y me indujeron a realizar colecciones extensivas en toda la laguna; estas colecciones se realizaron durante 1966-68 y cons tan de varios cientos de ejemplares, depositados en la Universidad de Costa Rica y en mi coleccion particular. El material acumulado durante estos anos y las notas tomadas durante todo el tiempo en que se realizaron han sido suficientes para permitir una serie de conclusiones en diversos aspectos, algunas …
Some Speculations About "The Great Nicaraguan Lake", Jaime Villa
Some Speculations About "The Great Nicaraguan Lake", Jaime Villa
Investigations of the Ichthyofauna of Nicaraguan Lakes
The available evidence indicates that Lakes Managua and Nicaragua were broadly connected in the past, when most of the fish species invaded the "Great Nicaraguan Lake". Due to the lowering of the water level (caused perhaps by tectonic movements and/or erosion produced by the Rio San Juan), Lake Managua became separated from Lake Nicaragua in the Tipitapa area. Water movement from Lake Managua is achieved mostly by seepage through a porous dropoff which prevents the exchange of fishes between the lakes. At about the same time, if not earler, Lake Xilml also became separated. After the more or less permanent …
Derivation Of The Freshwater Fish Fauna Of Central America, George S. Myers
Derivation Of The Freshwater Fish Fauna Of Central America, George S. Myers
Investigations of the Ichthyofauna of Nicaraguan Lakes
The nature, composition, and evolution of Centra) American freshwater fish groups are discussed in relation to the history and derivation of the faunal elements. It is concluded that the entire area between the Isthmus of Tehuantepec and eastern Panama was and always had been devoid of primary (obligatory) freshwater fishes prior to the very late Tertiary. Instead, secondary freshwater fishes evolved in this area during the Neogene and perhaps for a longer period, the Poeciliidae having probably had a longer history within the area than the Cichlidae. In the late Tertiary a very few North American immigrants entered the area …
Peces De La Cuenca De Los Grandes Lagos De Nicaragua, Ignacio Astorqui
Peces De La Cuenca De Los Grandes Lagos De Nicaragua, Ignacio Astorqui
Investigations of the Ichthyofauna of Nicaraguan Lakes
El presente trabajo se basa en una coleccion de peces hecha en Nicaragua par el Profesor Luis R. Rivas y el autor des de el 11 de Junia hasta el 14 de Julio de 1960. El trabajo se limita a la cuenca de los Grandes Lagos y rios trio butarios (Fig. 1). La mayor parte del material procede de esta zona y no pre· ten de ser un trabajo ictio16gico definitivo acerca de Nicaragua.
Aspectos de la paleografia de Centroamerica, el origen de la fauna de los lagos y la historia de la ictiologia de Nicaragua se encuentran en un …
Digenea Of Fishes From Lake Nicaragua, Donald E. Watson
Digenea Of Fishes From Lake Nicaragua, Donald E. Watson
Investigations of the Ichthyofauna of Nicaraguan Lakes
This paper covers a collection of helminths made during the summer of 1963. The Monogenea and Cestoda of elasmobranchs are reported in a separate paper (Watson and Thorson, 1976). Most of the teleosts were obtained (many still alive) from the fish market in Granada and were caught in Lake Nicaragua. The others were taken by seine or hook and line from the lake, from Tepetate and from San Carlos.
There have been relatively few studies on Digenea from Central America and most of the work has been done on helminths of vertebrates other than fishes. Brenes (1961) catalogued the parasites …
An Investigation Into The Use Of Artificial Habitats As A Means Of Increasing The Fishery Productivity Of The Great Lakes Complex Of Nicaragua, Terrance M. Lim, Kenneth R. Mckaye, Douglas J. Weiland
An Investigation Into The Use Of Artificial Habitats As A Means Of Increasing The Fishery Productivity Of The Great Lakes Complex Of Nicaragua, Terrance M. Lim, Kenneth R. Mckaye, Douglas J. Weiland
Investigations of the Ichthyofauna of Nicaraguan Lakes
Protein deficiency is a major dietary problem in Central America where protein-rich foods are scarce and costly. Fish, however, represents a rich source of animal protein that is not being utilized to a significant extent. Moreover, it is a source that could be made available to large portions of the populations of these countries if improvements of the present fishing and distribution methods were realized. Prerequisite to expansion, however, is a basic understanding of the ecosystems and their components. It is at this preliminary stage that the situation presently lies. Once this understanding has been achieved, means of maximizing production …
Informe Sobre Los Resultados Del Programa De Investigacion De Los Recursos Pesqueros Del Lago De Nicaragua, Instituto De Fomento Nacional
Informe Sobre Los Resultados Del Programa De Investigacion De Los Recursos Pesqueros Del Lago De Nicaragua, Instituto De Fomento Nacional
Investigations of the Ichthyofauna of Nicaraguan Lakes
E1 Instituto de Fomento Nacional (INFONAC), basado en los principios de su Ley Creadora y en la politica de desarrollo pesquero que se ha trazado, tome en el mes de Enero de 1971, la firme determinacion de iniciar el "Programa de Investigacion de los Recursos Pesqueros del Lago de Nicaragua" con una duracion estimada de tres (3) aiios, teniendo como base de operaciones la Ciudad de Granada.
Length/Weight Frequencies For Five Species Of Fish In Lake Nicaragua, Richard J. Beatty, Kurt W. Koenig
Length/Weight Frequencies For Five Species Of Fish In Lake Nicaragua, Richard J. Beatty, Kurt W. Koenig
Investigations of the Ichthyofauna of Nicaraguan Lakes
This paper places on record data on the length/weight frequencies of five commercially important species in Lake Nicaragua: Megalops atlanticus, Centropomus parallelus, Lepisosteus tropicus, Cichlasoma citrinellum and Cichlasoma nuaraguense.
The data were collected between November, 1971 and June, 1972, during a preliminary study of the fishery of Lake Nicaragua. The program was sponsored by the Instituto de Fomento Nacional (INFONAC) of Nicaragua, with financial and technical assistance provided by the United Nations Food and Agricultural Organization (FAO) and the United States Peace Corps.
En El Gran Lago, Medicina Y Cultura
En El Gran Lago, Medicina Y Cultura
Investigations of the Ichthyofauna of Nicaraguan Lakes
Conociendo la pepesca gaspar por experiencia previa quede muy sorprendido cuando, en Marzo del presente ano, vi dos 0 tres ejemplares nadando rapidamente en las cercanias de la isleta "Guanabana", en el Gran Lago. Acompafiado por mi esposa Marsha y por Michael Springer colectaba peces alrededor de esa isla con redes de mano. Al ver los ejemplares en el agua no pude menos que pensar inmediatamente en la pepesca gaspar, pero no me parecia factible encontrarla ya que la especie no habia sido antes registrada en el Gran Lago cuando, siendo comun en las regiones que habita, es una de …
Systematic Status Of The Cichlid Fishes Cichlasoma Dorsatum, C. Granadense And C. Nigritum Meek, Jaime Villa
Systematic Status Of The Cichlid Fishes Cichlasoma Dorsatum, C. Granadense And C. Nigritum Meek, Jaime Villa
Investigations of the Ichthyofauna of Nicaraguan Lakes
In his Synopsis of the Fishes of the Great Lakes of Nicaragua, Meek (1907) described 3 new cichlid fishes, Cichlasoma dorsatum, C. granadense and C. nigritum. The descriptions appeared after the two major revisions of the genus Cichlasoma (Pellegrin, 1904; Regan, 1905), which perhaps explains why they have since been ignored.
Presence Of The Cichlid Fish Cichlasoma Managuense Gunther In Lake Xiloá, Nicaragua, Jime Villa
Presence Of The Cichlid Fish Cichlasoma Managuense Gunther In Lake Xiloá, Nicaragua, Jime Villa
Investigations of the Ichthyofauna of Nicaraguan Lakes
Villa (1968) included C. managuense in the fauna of Lake Xiloá as a "recently introduced" species since the Ministerio de Agricultura y Ganaderia (Nicaragua) had introduced several hundred young individuals of this species from Lake Managua, hatched at the Estacion Experimental "La Calera." Apparently officials of the Ministerio did not determine whether or not C. managuense occurred in Lake Xiloá prior to its introduction.
Variación, Coloración Y Estado Sistemático Del Pez Centroamericano Cichlasoma Nicaraguense (Familia Cichlidae), Myrna I. López
Variación, Coloración Y Estado Sistemático Del Pez Centroamericano Cichlasoma Nicaraguense (Familia Cichlidae), Myrna I. López
Investigations of the Ichthyofauna of Nicaraguan Lakes
Cichlasoma balteatum and C. spilotum are placed in the synonymy of C. nicaraguense on the basis of a review of the literature and examination of fresh material from Lake Nicaragua and the Atlantic slope of Costa Rica. Observations on coloration and caudal fin scalation are included.
Pigments Of A Color Polymorphism In A Cichlid Fish, Robert Webber, George W. Barlow, Alan H. Brush
Pigments Of A Color Polymorphism In A Cichlid Fish, Robert Webber, George W. Barlow, Alan H. Brush
Investigations of the Ichthyofauna of Nicaraguan Lakes
1. Cichlasoma citrinellum occurs as gray or gold morphs in lakes in Nicaragua. The gold morph is variable and individuals range from yellow to dark orange.
2. The pigments responsible for the carotenoid coloration are E-carotene and canthaxanthin. The gray morph contains a carotenoid component and also heavy melanin deposits.
3. The carotenoids are dietary in origin, but their distribution and intensity is presumably under genetic control.
4. The relation of color morphs to the ecological and selective forces which might produce them is discussed.
Parental Behavior And Some Histological Features Of Scales In Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes
Parental Behavior And Some Histological Features Of Scales In Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes
Investigations of the Ichthyofauna of Nicaraguan Lakes
We have described elsewhere the ontogeny of behavior of young Cichlasoma citrinelium, and some aspects of the behavior of the parents during the corresponding period (Noakes and Barlow 1968, 1973a, 1973b). Adults are polymorphic in body color, the "normal" color being grey; the "gold" morphs are more or less xanthic and lack the species typical dark markings (Barlow 1973; and in preparation). The young have a characteristic behavior directed toward the parents in both the laboratory and the field. About 4 days after the young become free-swimming, they begin to feed from the body surfaces …
The Status Of The Freshwater Shark Of Lake Nicaragua, Thomas B. Thorson, Donald E. Watson, C. Michael Cowan
The Status Of The Freshwater Shark Of Lake Nicaragua, Thomas B. Thorson, Donald E. Watson, C. Michael Cowan
Investigations of the Ichthyofauna of Nicaraguan Lakes
Nineteen sharks collected from freshwater at several points on Lake Nicaragua and the Rio San Juan were all of the same species and indistinguishable from marine Carcharhinus leucas of the Atlantic. Minor differences previously thought to separate C. leucas from the lake shark proved to be invalid. Females had slightly longer gill slits, somewhat greater breadth of pelvic fin, and a longer abdominal region than males. Clasper length indicated that the onset of sexual maturity in males occurs when they are between 1,600 and 1,700 mm in total length.
The classical theory or origin of the sharks from Pacific ancestry …
An Investigation Of The Feeding Habits Of The Bull Shark, Carcharhinus Leucas, In The Lake Nicaragua-Rio San Juan System, Robert E. Tuma
An Investigation Of The Feeding Habits Of The Bull Shark, Carcharhinus Leucas, In The Lake Nicaragua-Rio San Juan System, Robert E. Tuma
Investigations of the Ichthyofauna of Nicaraguan Lakes
The bull shark or cub shark, Carcharhinus leucas, occurs in tropical and subtropical waters of the Atlantic, Pacific, and Indian oceans. In the western Atlantic it occurs from New York to southern Brazil.
Reproduction Of The Bull Shark, Carcharhinus Leu Cas , In The Lake Nicaragua-Rio San Juan System, Norman H. Jenson
Reproduction Of The Bull Shark, Carcharhinus Leu Cas , In The Lake Nicaragua-Rio San Juan System, Norman H. Jenson
Investigations of the Ichthyofauna of Nicaraguan Lakes
Carcharhinus leucas, the bull shark, or cub shark, is a member of a large family, the Carcharhinidae, sometimes called requiem sharks. It is of medium size, reaching a maximum of a little more than three meters in some parts of its range, but little more than two and one-half meters in my study area. It is euryhaline, able to live for extended periods of time in both freshwater and marine environments. It is a viviparous shark, retaining the young and nourishing them by means of a yolk-sac placenta.
Partitioning Of Body Fluids In The Lake Nicaragua Shark And Three Marine Sharks, Thomas B. Thorson
Partitioning Of Body Fluids In The Lake Nicaragua Shark And Three Marine Sharks, Thomas B. Thorson
Investigations of the Ichthyofauna of Nicaraguan Lakes
The relative volumes of major body fluids of freshwater and marine sharks are remarkably similar in spite of the differences in external medium and in osmotic pressure of body fluids. The small differences detected are in agreement with differences reported in comparisons of freshwater and marine te1eosts: a slightly higher total water content and a smaller ratio of extracellular to intracellular fluids in freshwater forms.
Hemoglobin Stability In Bull Sharks, Jack D. Burke
Hemoglobin Stability In Bull Sharks, Jack D. Burke
Investigations of the Ichthyofauna of Nicaraguan Lakes
No significant differences in oxyhemoglobin affinity, or electrophoretic patterns of hemoglobin were found in 18 bull sharks collected in selected regions of Lake Nicaragua, the Rio San Juan, and the Caribbean Sea. The half-saturation of hemoglobin with oxygen (P50) was 11 and 17 mm Hg at pH 7.4 and 6.8, respectively (25° C, 3% hemoglobin solution, potassium phosphate buffer, 0.3 ionic strength). Electrophoresis resolved the hemoglobin into a minor and a major band. P1animetry of densitometric recordings showed that the major band constituted 54% of the total hemoglobin; the minor band, 46%. On the basis of these hemoglobin studies, no …