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Articles 31 - 60 of 73
Full-Text Articles in Aquaculture and Fisheries
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.
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 …
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.
Competition Between Color Morphs Of The Polychromatic Midas Cichlid Cichlasoma Citrinellum, George W. Barlow
Competition Between Color Morphs Of The Polychromatic Midas Cichlid Cichlasoma Citrinellum, George W. Barlow
Investigations of the Ichthyofauna of Nicaraguan Lakes
The Midas cichlid, Cichlasoma citrinellum, is a polychromatic fish that occurs in Nicaragua. All of these fish start life as normally colored, cryptic individuals. In some populations a few fish change into conspicuously colored morphs, most frequently gold. When kept in unmixed color groups, golds and normals grow at the same rate; but when they are mixed, growth of the golds becomes taster and that of the normals slower. Golds dominate normals in contests over food, which accounts for their advantage.
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 …
Body Fluid Solutes Of Juveniles And Adults Of The Euryhaline Bull Shark Carcharhinus Leucas From Freshwater And Saline Environments, Thomas B. Thorson, C. Michael Cowan, Donald E. Watson
Body Fluid Solutes Of Juveniles And Adults Of The Euryhaline Bull Shark Carcharhinus Leucas From Freshwater And Saline Environments, Thomas B. Thorson, C. Michael Cowan, Donald E. Watson
Investigations of the Ichthyofauna of Nicaraguan Lakes
Since the discovery of the phenomenally high urea content of the body fluids of cartilaginous fishes by Staedeler and Frerichs (1858), the unique osmoregulatory system of this vertebrate class has been studied by many investigators. In broad outline, the mechanisms are essentially similar in all three of the major subtaxa: the selachians, the batoids, and the holocephalans. A single exception is the genus Potamotrygon (fresh-water stingrays of South America and Africa), which has apparently lost the ability to concentrate urea even when transferred to salt water.
Rectal Glands Of Marine And Fresh-Water Sharks: Comparative Histology, Mikio Oguri
Rectal Glands Of Marine And Fresh-Water Sharks: Comparative Histology, Mikio Oguri
Investigations of the Ichthyofauna of Nicaraguan Lakes
The rectal glands of elasmobranchs perform the function of salt-excreting organs. These glands are smaller and show regressive changes in specimens of the bull shark, Carcharhinus leucas, found in fresh-water environment, compared with specimens of this and other species from a marine habitat.
Observations On The Reproduction Of The Sawfish, Pristis Perotteti, In Lake Nicaragua, With Recommendations For Its Conservation, Thomas B. Thorson
Observations On The Reproduction Of The Sawfish, Pristis Perotteti, In Lake Nicaragua, With Recommendations For Its Conservation, Thomas B. Thorson
Investigations of the Ichthyofauna of Nicaraguan Lakes
The presently known pristiform fauna of the western Atlantic consists of only two species, one each of Fowler's (1941) subgenera, Pristis and Pristiopsis. The former, characterized by the absence of a subcaudal lobe on the caudal fin, is represented by Pristis pectinatus; the latter, in which the subcaudal lobe is present, by Pristis perotteti. Although several features readily separate the two species, they can most easily be distinguished by the more slender rostrum of P. pectinatus and its larger number of rostral teeth, 24 to 32 on each side, as compared with 14 to 20 in …
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.
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.
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 …
Geographical Distribution Of Central American Freshwater Fishes, Robert Rush Miller
Geographical Distribution Of Central American Freshwater Fishes, Robert Rush Miller
Investigations of the Ichthyofauna of Nicaraguan Lakes
The distribution of freshwater fishes in Central America is reviewed. Major parts of the region, especially in Honduras and Nicaragua, have yet to be explored ichthyologically, and systematic revision of important groups, notably the cichlids, is long overdue. The continental area from the Isthmus of Tehuantepec to the Colombian border contains approximately 456 species, of which over 75% comprise the Cyprinodontidae, Poeciliidae, Cichlidae, and marine invaders (peripheral fishes); about one-third of the latter (57 species) have taken up more or less permanent residence in fresh water. There are 104 primary species in 10 families, 165 secondary forms in 6 families, …
Geographic Distribution Of The San Juan Ichthyofauna Of Central America With Remarks On Its Origin And Ecology, William A. Bussing
Geographic Distribution Of The San Juan Ichthyofauna Of Central America With Remarks On Its Origin And Ecology, William A. Bussing
Investigations of the Ichthyofauna of Nicaraguan Lakes
The scientific study of fishes of the Great Lakes of Nicaragua began in 1864 with the description by Gunther of Heros labiatus (=Cichlasoma labiatum) from Lake Managua. Subsequently, Gunther reported on several other species collected in the Great Lakes by Captain J. M. Dow. Astorqui (1967) reviewed the sparse ichthyological literature dealing with Nicaraguan fishes and pointed out the paucity of recent studies. Since then Villa (1971) has produced a provisional list of the freshwater and brackish water fishes of Nicaragua and Astorqui (1972) has analyzed the ichthyofauna of the Great Lakes Basin. Riedel (1972) discussed the geological …
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 …
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 …
Lake Nicaragua Fishery Resources, William D. Davies
Lake Nicaragua Fishery Resources, William D. Davies
Investigations of the Ichthyofauna of Nicaraguan Lakes
Data collected during this survey indicated that the number of full-time fishermen has not increased appreciably over the past several years. However, it is likely that, if the demand for fish were to increase, a number of the present part-time fishermen would increase their effort to full-time. Indications are strong that the fish catch from this lake could at least be doubled by the existing population of fishermen, using the same gear, if market conditions were such as to encourage greater fishing effort.
The lake's overall fisheries resources are far from being exploited to their maximum, with the possible exception …
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.
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 …
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.
La "Pepesca Gaspar", Otro Pez Desconocido Del Gran Lago, Jaime Villa
La "Pepesca Gaspar", Otro Pez Desconocido Del Gran Lago, Jaime Villa
Investigations of the Ichthyofauna of Nicaraguan Lakes
En un articulo recientemente aparecido, informe sobre la presencia de un pez hasta entonces desconocido en el Lago de Nicaragua, el gimnoto cilindrico. Existen, sin embatgo, varias especies adicionales que he ido descubriendo poco a poco y que ire presentando de igual modo al publico lector.
The Red Devil-Midas-Arrow Cichlid Species Complex In Nicaragua, George W. Barlow, John W. Munsey
The Red Devil-Midas-Arrow Cichlid Species Complex In Nicaragua, George W. Barlow, John W. Munsey
Investigations of the Ichthyofauna of Nicaraguan Lakes
Within this group (section Amphilophus) of Nicaraguan cichlid fishes, we recognize two of the eight named species, Cichlasoma labiatum (Günther) and C. citrinellum (Günther). A new species from Lake Apoyo, C. zaliosum Barlow, is described. The red devil cichlid (C. labiatum) occurs only in the Great Lakes, but the Midas cichlid (C. citrinellum) is found in most of the surrounding lakes as well, and also in Costa Rica; where the two species are sympatric they differ most from one another. In Lakes Masaya and Jiloá some individuals of C. citrinellum show features of C. labiatum …
Relative Abundance And Distribution Of The Mojarra (Cichlasoma Citrinellum) In Lake Nicaragua, Sergio Martínez C
Relative Abundance And Distribution Of The Mojarra (Cichlasoma Citrinellum) In Lake Nicaragua, Sergio Martínez C
Investigations of the Ichthyofauna of Nicaraguan Lakes
Sixteen families and at least forty-five species of fishes have been reported from Lake Nicaragua (Astorqui, 1971; Villa, 1971). The National Development Institute of Nicaragua (INFONAC) has investigated the potential fish resources and their distribution in the lake in order to implement a program of development and a rational management of the fisheries of the lake (INFONAC, 1974). The study at hand was conducted in connection with that investigation to define the abundance and natural habitat of the mojarra, Cichlasoma citrinellum. This fish belongs to the family Cichlidae, which is represented in the lake by several species.
Cichlasoma …
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.
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.
Cross-Fostering And Parent-Offspring Responses In Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes, George W. Barlow
Cross-Fostering And Parent-Offspring Responses In Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes, George W. Barlow
Investigations of the Ichthyofauna of Nicaraguan Lakes
Previous studies of parent-young interactions in cichlid fish have established some of the details of such relations, but have raised, or left unanswered many questions. In particular, there are questions as to the recognition of parents and young by each other, and to what extent learning might be involved in such recognition.
Based on observations of exchanges of parents between families of Cichlasoma citrinellum, we suggest that parents learn to recognize young during each parental cycle. They appear to have a moderately short term memory for recognition of young, and accept young corresponding to this memory.
Parental fish accept …
Ontogeny Of Parent-Contacting In Young Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes, George W. Barlow
Ontogeny Of Parent-Contacting In Young Cichlasoma Citrinellum (Pisces, Cichlidae), David L. G. Noakes, George W. Barlow
Investigations of the Ichthyofauna of Nicaraguan Lakes
There is an extensive literature on cichlid fish behavior, but most of this treats the behavior of adults (see BREDER & ROSEN, I966, for example). Much of this is based on laboratory observations with little corroborative information from field studies. Recently there has been an increasing trend to study the development of behavior, in cichlids as in other animals. In part this results from the 'nature-nurture' controversy regarding factors control~ ling behavior (e.g. KRUIJT, I964). However, there is also interest in the study of young animals for their own sake (e.g. WARD & BARLOW, I967).
The present study was undertaken …
Competition Between Color Morphs Of The Midas Cichlid, Cichlasoma Citrinellum, In Lake Jiloá, Nicaragua, Kenneth R. Mckaye, George W. Barlow
Competition Between Color Morphs Of The Midas Cichlid, Cichlasoma Citrinellum, In Lake Jiloá, Nicaragua, Kenneth R. Mckaye, George W. Barlow
Investigations of the Ichthyofauna of Nicaraguan Lakes
Color polymorphism, or polychromatism, is a recurring phenomenon throughout the animal kingdom. In fishes one form, the goldfish, is particularly notable because of its conspicuousness and its occurrence in nature in such a large number of widely unrelated species; yet it is seldom common in anyone species (Webber et al., 1973). The Midas cichlid, Cichlasoma citrinellum, is unusual in this respect because in many of the lakes where it occurs in Nicaragua brilliantly colored morphs are relatively common. These morphs lack the species-typical dark markings, and individuals vary smoothly from white through yellow, orange, red, and mixtures of …
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.