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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

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

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

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

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

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

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

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.

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.

Serum Protein Variation In The Bull Shark, Carcharhinus Leucas Müller And Henle, 1841, C. Michael Cowan

Investigations of the Ichthyofauna of Nicaraguan Lakes

I. A detailed electrophoretic study was made of different developmental stages of the bull shark, Carcharhinus leucas Mülller and Henle, 1841.
2. Both qualitative and quantitative variations were found to exist between newborn and adult bull sharks.
3. Variations in the globulin portion may be related to the development of immunoglobulins.

Comparison Of Some Parameters Of Serum And Uterine Fluid Of Pregnant, Viviparous Sharks (Carcharhinus Leucas) And Serum Of Their Near-Term Young, Thomas B. Thorson, Jeffrey W. Gerst

Investigations of the Ichthyofauna of Nicaraguan Lakes

I. In eight females, serum urea concentrations of 134-336 mM/l. were interpreted as indications of previous environmental salinities.
2. Fetal serum solute concentrations usually resembled those of the mother, but in two cases where fetal urea was higher, it was interpreted as a lag in urea reduction following movement from salt to fresh water.
3. Uterine fluid was similar to maternal serum in all parameters except for its very low protein content.
4. No flushing of the uteri with environmental water occurs.
5. Independent osmoregulation apparently does not occur before birth, although required mechanisms may be present.
6. The full …

The Rectal Gland In Relation To The Osmoregulatory Mechanisms Of Marine And Freshwater Elasmobranchs, Giuseppe Gerzeli, Gian Franco De Stefano, Lorenzo Bolognani, Kurt W. Koenig, Maria Victoria Gervaso, Maria Fausta Omodeo-Salé

Investigations of the Ichthyofauna of Nicaraguan Lakes

The rectal gland of elasmobranchs secretes large quantities of electrolytes and is of primary importance in the osmoregulatory mechanisms of these animals (Burger and Hess, 1960; Burger, 1962). Analogously, various organs of other vertebrates are also known to be involved in salt secretion (Schmidt-Nielsen, 1965; Bonting, 1970; Bentley, 1971). In general, active ion transport is the basis of this phenomenon; in any case, it requires the presence of structural devices, morphologically and chemically well defined, and of metabolic capabilities which, taken singly, are not specific, but collectively are consistent with active ion transport and salt secretion.

Sexual Dimorphism In Number Of Rostral Teeth Of The Sawfish, Pristis Perotteti Miiller And Henle, 1841, Thomas B. Thorson

Investigations of the Ichthyofauna of Nicaraguan Lakes

Rostral tooth counts were made of 211 sawfish (Pristis perotteti) from the Lake Nicaragua-Rio San Juan System. The number of teeth is established early in development and it changes only on accidental loss of teeth, which are not replaced. The average number on the left side is equal to that on the right, but in individuals, either side may have as many as three more teeth than the other. Female tooth counts average 15.94 per side and range from 14 to 18, while males average 18.00 with a range of 16 to 20. Within litters, this dimorphism is …

Index Of Scientific Names

Investigations of the Ichthyofauna of Nicaraguan Lakes

Index of scientific names in Investigations of the Ichthyofauna of Nicaraguan Lakes.

Laboratory Apparatus For Providing Diel Temperature Regimes For Aquatic Animals, Wayne A. Wurtsbaugh, G. Davis

Watershed Sciences Faculty Publications

In studies of the effects of elevated temperature on aquatic organisms, little emphasis has been placed on modeling the fluctuating temperatures to which organisms are exposed in nature. To some extent this may be related to problems of design and maintenance of apparatus for fluctuating temperature control. The complexity of apparatus used to provide cycled temperatures has ranged from manually controlled valves for introducing water of different temperatures into aquariums (Kelso 1972), to a complex and expensive feedback system, regulated by rotating cams, that controls the temperature of influent water (Honeywell Cam Programmer Thermometers, Fort Washington, Pennsylvania). To facilitate studies …

Macrobenthos Population Changes In Crystal Lake, Arkansas, Subsequent To Cage Culture Fish, James C. Adams, Raj V. Kilambi, William A. Wickizer, Arthur V. Brown

Journal of the Arkansas Academy of Science

A three-year study was conducted to determine the possible effects of cage culture of fish on the environment of Crystal Lake, Arkansas. The investigation consisted of three periods: pre- (November 1971-October 1972), during- (November 1972-October 1973), and post- (November 1973-October 1974) cage culture. Numbers and biomass of benthos per square meter for pre-, during-, and post-culture periods were 1353 (10.0g), 730 (8.8g), and 1028 (4.1g), respectively. Numerically, Chaoborus sp., Chironomidae, and Oligochaeta comprised more than 97%. Chaoborus was the most numerous organism before fish culture (>68%), but dominance shifted to the Oligochaeta (>58%) after culture.

Food Habits Of The Steelcolor Shiner, Notropis Whipplei (Girard), Mark A. Dyer

Masters Theses

Specimens of the steelcolor shiner, Notropis whipplei (Girard) were seined at irregular intervals from Polecat Creek (Coles County, Illinois) from October 1974 to September 1975. Drift and benthic samples were taken in conjunction with fish collections. The stomach contents of the fish were analyzed and compared to organisms found in the drift and benthos. More food taxa were represented in the fish collected during the summer. Aquatic insect forms, primarily chironomid larvae, amounted to 75.6% of the total percentage of foods eaten during the winter as compared to 18.8% for the summer. Adult insects, mainly coleopterans and dipterans, were the …

Fishes Of The Fourche River In Northcentral Arkansas, Steve M. Bounds, John K. Beadles

Journal of the Arkansas Academy of Science

A survey of the fishes of Fourche River in northcentral Arkansas was made between June 1974 and March 1976. Field collections and literature records revealed that the river system was inhabited by 94 species of fish representing 21 families. The collected fishes represent both the Ozark and the lowland faunal groups. Fourteen species of Etheostoma and four species of Percina were collected. The records of Etheostoma asprigene and Elassoma zonatum represent extensions of the previously known ranges of these species within the state. Noturus gyrinus and Etheostoma histrio were recorded from the Black River system in Arkansas for the first …

Fishes Of The Cane Creek Watershed In Southeast Missouri And Northeast Arkansas, Bruce E. Yeager, John K. Beadles

Journal of the Arkansas Academy of Science

A survey of the fishes of Cane Creek in southeast Missouri and northeast Arkansas was made between 25 August 1974 and 16 July 1975. Field collections, literature records, fisherman reports, and museum specimens showed the fishes of Cane Creek to be composed of 90 species distributed among 20 families. Records of Lampetra aepyptera (Abbott), Hiodon alosoides (Rafinesque), Etheostoma histrio Jordan and Gilbert, and Percina uranidea (Jordan and Gilbert) were either the first records of these species in this stream or reaffirmed their presence. The fish collected were common to the Ozark, Ozark lowland, lowland, and wide-ranging faunal groups of Pflieger …

Mercury Levels In Muscle Tissue Of Stream-Dwelling Fish, Tom Frost

Masters Theses

No abstract provided.

Feeding Selectivity Of Young-Of-The-Year Smallmouth Bass, Micropterus Dolomieui Lacepede, In Four Rearing Ponds, Gordon Brent Manning

Masters Theses

No abstract provided.

Vegetation Development In Relation To Age Of River Stabilization Structures Along A Channelized Segment Of The Missouri River, John Arthur Vaubel

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

During the summer of 1974, I sampled sites of vegetation representative of successional trends in plant communities along the Missouri River floodplain from Sioux City, Iowa, to Rulo, Nebraska. Five district community types listed from youngest to oldest are as follows: Salix spp. – dominated, Populus deltoides – dominated, Platanus occidentalis-Ulmus rubra – dominated, Tilia americana-Quercus rubra – dominated, and Quercus macrocarpa-Carya ovata – dominated vegetation.

The technique of relating vegetation succession to age of river stabilization structures was found to be useful and offered a quite precise method of developing a timescale …

An Evaluation Of The Fishery Resources Of The Thames River Watershed, Connecticut, Connecticut Department Of Environmental Protection

Storrs Agricultural Experiment Station

No abstract provided.

State Of The Fisheries Report 1974, Department Of Fisheries And Wildlife, Western Australia

Status Reports of the Fisheries and Aquatic Resources

The total value of the fisheries of Western Australia is the highest of any of the States, and the Western Australian rock lobster fishery is the most valuable single fishery in Australia.

Herpesvirus Disease Of Salmonids, Ken Wolf, Tokuo Sano, Takahisa Kimura

United States Fish and Wildlife Service: Publications

A newly recognized virus, lethal for fry and fingerlings, has been isolated from brood stock rainbow trout (Salmo gairdneri) at the Winthrop National Fish Hatchery, Washington. A similar if not identical virus has been found in natural epizootics occurring annually since 1970 among fry of landlocked sockeye salmon (Oncorhynchus nerka) on Honshu Island, Japan. More recently, this agent was isolated from moribund and dead adult O. nerka on Hokkaido Island; Japan, but it remains to be determined whether or not the virus causes death in adult salmonids. The purpose of this leaflet is to bring the …

Fisheries Report No 19 - The Western Rock Lobster Fishery 1973 - 1974, G. R. Morgan, E H. Barker

Fisheries Research Reports

The fishery for the western rock lobster* is one of the most important single fisheries in Australia and an important export earner for the State. The fishery is governed by a complex set of regulations which have been reviewed by Bowen (1971) and which are designed to limit the total effort to acceptable levels and to enforce a legal minimum size. It is thus important to constantly monitor the state of the fishery both to ensure that the effort is remaining within the accepted limits and that the regulations are adequately performing their function of maintaining reasonably stable catches. Inherent …

Fisheries Report No 18 - Tuna Survey In Waters Off The Western Australian Coast During The Period August 1973 To August 1974, J. P. Robins

Fisheries Research Reports

In September 1972, Markwell Ross Fisheries Pty Ltd (a subsidiary fishing division of Q.U.F. Industries Ltd) approached the Western Australian Department of Fisheries and Fauna (now Department of Fisheries and Wildlife) for assistance in the development and carrying out of a purse seining programme using the 25m rock lob­ster vessel F.B. Western Star.

Negotiation and agreement was reached, with the objective to under­take and carry out an investigation into the feasibility of developing a purse seine fishery for tuna in Western Australian waters. The Department of Fisheries and Wildlife (Development Section) supplied, on loan, capital fishing equipment (purse seine net, …

Fisheries Report No 16 - Notes On The Wildlife Of A Proposed Nature Reserve Around Lake Grace And Lake Chinokup, Western Australia, N. L. Mckenzie, W. K. Youngson

Fisheries Research Reports

During 1972 and 1973 plants and vertebrate animals were collected and recorded from a proposed 22 000 ha nature reserve centred on a chain of salt lakes in south-western Western Australia (33° 10' S - 33° 35' 8 and 118° 19' B - 118° 29' E).

The dominant plant species were collected, the structural formations desert bed and a vegetation map produced. Seven species of native terrestrial mammal and three species of bat were recorded.

Three of the terrestrial species are endemic to southwestern Western Australia, and two of these - Pseudomys occidentalis and Sminthopsis granulipes - are regarded as …

Fisheries Report No 17 - Some Aspects Of Tuna And Its Potential In The Oceanic Waters Off Western Australia, J. P. Robins

Fisheries Research Reports

In this report an endeavour has been made to describe very briefly the growth of the tuna fishery in Australia, world production, utilisation, price and future demand, tuna species descriptions, species occurrence around the Australian coast and the results of two aerial surveys for tuna off. the west and north-west coasts of Western Australia.

Age And Growth Of Bluegill, Lepomis Macrochirus Rafinesque, From Lake Fort Smith, Arkansas, Jacob J. Hogue, Raj V. Kilambi

Journal of the Arkansas Academy of Science

A total of 337 bluegill from Lake Fort Smith were used for this study. Annuli were formed between late February and early June, the younger fish forming annuli earlier than older fish. Total length-scale radius and length-weight relationships were determined. Growth of bluegill was compared with that reported in other studies. Growth curves were analyzed by the Von Bertalanffy growth formula and the parameters were evaluated in terms of physical and biological factors.