scholarly journals Nuclear-follower foraging associations among Characiformes fishes and Potamotrygonidae rays in clean waters environments of Teles Pires and Xingu rivers basins, Midwest Brazil

2011 ◽  
Vol 11 (4) ◽  
pp. 359-362 ◽  
Author(s):  
Domingos Garrone Neto ◽  
Lucélia Nobre Carvalho
Keyword(s):  
Freshwater Fish ◽  
The Other ◽  
Teleost Fishes ◽  
Freshwater Stingray ◽  
New Interactions ◽  
Foraging Associations ◽  
Commensal Relationship

During under and overwater observations were recorded nuclear-follower foraging associations among three species of characiform fishes - Chalceus epakros, Hemiodus semitaeniatus and Hemiodus unimaculatus - and a freshwater stingray species - Potamotrygon orbignyi - in the Teles Pires and Xingu rivers basins, Midwest Brazil. The teleost fishes were observed closely following the stingrays during the behavior of stirring the substrate to uncover invertebrates, which cause discrete sediment clouds. Apparently this sediment perturbation attracts the fishes that approached the foraging stingrays to feed on small preys and other food types exposed this way. This is a typical example of a commensal relationship in which one participant is benefited while the other is unaffected, and represents the second published record of nuclear-follower feeding association between potamotrygonid rays and teleost fishes, demonstrating the potential of naturalistic studies in discovering new interactions involving species of freshwater fish.

A new nematode Neocamallanus bareilliensis from a piscine host Channa punctatus Bloch

1980 ◽  
Vol 54 (1) ◽  
pp. 21-23
Author(s):  
R. K. Sharma ◽  
P. K. Sharma
Keyword(s):  
Freshwater Fish ◽  
The Other ◽  
Channa Punctatus

ABSTRACTNeocamallanus bareilliensis n. sp. has been described from the intestine of a freshwater fish Channa punctatus from Bareilly (U. P.) India. It has been distinguished from the other three species of the genus reported so far.

The first record of Macrogyrodactylus species (Monogenea, Gyrodactylidae) on freshwater fishes in Senegal with the description of Macrogyrodactylus simentiensis sp. nov., a parasite of Polypterus senegalus Cuvier

2008 ◽  
Vol 53 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Iva Přikrylová ◽  
Milan Gelnar
Keyword(s):  
Freshwater Fish ◽  
Posterior Margin ◽  
First Record ◽  
Freshwater Fishes ◽  
Marginal Hook ◽  
The Other ◽  
New Host ◽  
Polypterus Senegalus ◽  
New Host Records ◽  
Macrogyrodactylus Congolensis

AbstractThe first record of monogenean parasites of the genus Macrogyrodactylus Malmberg, 1957 on freshwater fish in Senegal is presented. Macrogyrodactylus congolensis Prudhoe, 1957 from the skin and Macrogyrodactylus heterobranchii N’Douba et Lambert, 1999 from the gills of Clarias anguillaris L. were found, representing new host records for these parasites. On Polypterus senegalus Cuvier, three Macrogyrodactylus species were identified, Macrogyrodactylus polypteri Malmberg, 1957, Macrogyrodactylus simentiensis sp. nov. and Macrogyrodactylus sp. M. simentiensis sp. nov. can be readily distinguished from the other Macrogyrodactylus species by the size of its hamuli and the shape of its marginal hook sickles. The marginal hooks on the anterolateral lobes of M. simentiensis differ in size and shape from those on the posterior margin of the haptor. Measurements and drawings of the haptoral sclerites of all five identified species are provided.

scholarly journals Immunoglobulin T genes in Neopterygii

2020 ◽  
Author(s):  
Serafin Mirete-Bachiller ◽  
David N. Olivieri ◽  
Francisco Gambón-Deza
Keyword(s):  
Immunoglobulin M ◽  
The Other ◽  
Teleost Fishes ◽  
Genome Sequences ◽  
Bioinformatics Pipeline ◽  
Immunoglobulin Isotypes ◽  
Depth Analysis ◽  
Learning Software ◽  
Immunoglobulin Heavy Chain Genes ◽  
Recent Duplication

AbstractIn teleost fishes there are three immunoglobulin isotypes named immunoglobulin M (IgM), D (IgD) and T (IgT). IgT has been the last to be described and is considered a teleosts-fish specific isotype. From the recent availability of genome sequences of fishes, an in-depth analysis of Actinopterygii immunoglobulin heavy chain genes was undertaken. With the aid of a bioinformatics pipeline, a machine learning software, CHfinder, was developed that identifies the coding exons of the CH domains of fish immunoglobulins. Using this pipeline, a high number of such sequences were obtained from teleosts and holostean fishes. IgT was found in teleost and holostean fishes that had not been previously described. A phylogenetic analysis reveals that IgT CH1 exons are similar to the IgM CH1. This analysis also demonstrates that the other three domains (CH2, CH3 and CH4) were not generated by recent duplication processes of IgM in Actinopterygii, indicating it is an immunoglobulin with an earlier origin.

scholarly journals Snakeskin Gourami (Trichogaster pectoralis) Stick High in Protein and Calcium as of Fish Product Diversification

2019 ◽  
Vol 22 (2) ◽  
pp. 311-317
Author(s):  
Dewi Kartika Sari ◽  
Hafni Rahmawati ◽  
Susilawati Susilawati
Keyword(s):  
Freshwater Fish ◽  
Calcium Content ◽  
Product Diversification ◽  
The Other ◽  
Sensory Characteristics ◽  
Chemical Characteristics ◽  
Chemical Quality ◽  
Fish Meat ◽  
The People ◽  
Fish Product

Snakeskin gourami (Trichogaster pectoralis) is a freshwater fish often consumed by the people of South Kalimantan. The meat and the bones of this fish can be processed into protein and calcium-rich fish sticks. This study was aimed to analyze the sensory and chemical characteristics of snakeskin gourami stick. The meat and bones of the fish were added into sticks ingredients with the proportion of 0; 20; 40 and 60%. The results showed that the addition of fish meat and bones significantly affected the sensory characteristics particularly on the aroma and the taste of fish sticks, as well as the chemical quality including protein, fat, carbohydrate, water, ash, and calcium content. The sticks made with 60% of the fish meat and bones were more preferred and gave better chemical characteristics than those made with the other proportions.

Cortical Changes in Acipenserid Eggs during Fertilization and Artificial Activation

Development ◽  
1962 ◽  
Vol 10 (1) ◽  
pp. 1-26
Author(s):  
T. A. Dettlaff
Keyword(s):  
Sea Urchins ◽  
The Other ◽  
Teleost Fishes ◽  
Perivitelline Space ◽  
Cortical Granules ◽  
Complex Chain ◽  
Artificial Activation ◽  
Suitable Object

In the complex chain of interrelated processes which make up the early changes in the egg during activation (see Tyler, 1941, 1955; Runnström, 1952; Rothschild, 1956; T. Yamamoto, 1956; Allen, 1958) many phenomena are still unclear: for example, the problem of the fertilization impulse, the rate of its spread, and its relationship with the other changes in the egg; the problem of the origin of the perivitelline space colloid and of its relation to the material of the cortical granules (Runnström, 1952; Rothschild, 1956; Allen, 1958). The main objects of investigation have hitherto been the eggs of sea urchins and, to a lesser extent, of teleost fishes, so that a danger exists that the sequence of phenomena characteristic of these eggs may be supposed to hold generally. Acipenserid eggs, because of certain peculiarities of their structure and development, are a suitable object for studies of this kind.

Amines in Fish Muscle. VI. Trimethylamine Oxide Content of Fish and Marine Invertebrates

1952 ◽  
Vol 8c (5) ◽  
pp. 314-324 ◽  
Author(s):  
W. J. Dyer
Keyword(s):  
Freshwater Fish ◽  
Marine Invertebrates ◽  
Dry Weight ◽  
Fish Muscle ◽  
Oxide Content ◽  
Teleost Fishes ◽  
Additional Species ◽  
Trimethylamine Oxide

Original determinations of the trimethylamine oxide content of 60 species of fish are recorded, and 21 additional species have been studied by others. Elasmobranchs have the highest content of oxide, two to five per cent based on dry weight. Among teleost fishes, the amount increases from the lower to the higher orders, freshwater fish containing no oxide. Analyses of several species of marine invertebrates confirm earlier work showing that certain molluscs, echinoderms and other organisms contain trimethylamine oxide, often in quantities similar to those in the higher teleosts.

scholarly journals Shrewd alliances: mixed foraging associations between treeshrews, greater racket-tailed drongos and sparrowhawks on Great Nicobar Island, India

2009 ◽  
Vol 6 (3) ◽  
pp. 304-307 ◽  
Author(s):  
Meera Anna Oommen ◽  
Kartik Shanker
Keyword(s):  
Predator Avoidance ◽  
The Other ◽  
Nicobar Island ◽  
Mixed Species ◽  
Potential Predator ◽  
Feeding Success ◽  
Primary Driver ◽  
To Come ◽  
Foraging Associations ◽  
Behavioural Strategies

Mixed-species foraging associations may form to enhance feeding success or to avoid predators. We report the costs and consequences of an unusual foraging association between an endemic foliage gleaning tupaid (Nicobar treeshrew Tupaia nicobarica ) and two species of birds; one an insectivorous commensal (greater racket-tailed drongo Dicrurus paradiseus ) and the other a diurnal raptor and potential predator ( Accipiter sp.). In an alliance driven, and perhaps engineered, by drongos, these species formed cohesive groups with predictable relationships. Treeshrew breeding pairs were found more frequently than solitary individuals with sparrowhawks and were more likely to tolerate sparrowhawks in the presence of drongos. Treeshrews maintained greater distances from sparrowhawks than drongos, and permitted the raptors to come closer when drongos were present. Treeshrew foraging rates declined in the presence of drongos; however, the latter may provide them predator avoidance benefits. The choice of the raptor to join the association is intriguing; particular environmental resource states may drive the evolution of such behavioural strategies. Although foraging benefits seem to be the primary driver of this association, predator avoidance also influences interactions, suggesting that strategies driving the formation of flocks may be complex and context dependent with varying benefits for different actors.

IS THE LAW OF UNIVERSAL GRAVITATION VALID AT SHORT DISTANCES?

1998 ◽  
Vol 13 (17) ◽  
pp. 1401-1406 ◽  
Author(s):  
ROBERTO ONOFRIO
Keyword(s):  
Elementary Particle ◽  
Particle Physics ◽  
Short Range ◽  
The Other ◽  
Universal Gravitation ◽  
Micromechanical Resonators ◽  
Fundamental Interactions ◽  
Elementary Particle Physics ◽  
The Law ◽  
New Interactions

Recently, short-range macroscopic forces superimposed to gravity have been conjectured. We argue that their existence is unavoidable if gravity has to be merged with the other fundamental interactions within the currently accepted paradigms for unification. A first attempt to detect such forces in the macroscopic range using micromechanical resonators is reported, together with a discussion of further sensitivity improvements. Implications of the possible discovery of these new interactions in elementary particle physics and cosmology are outlined.

scholarly journals DISTRIBUTION AND PRODUCTION OF FRESH WATER FISH FARMERS GROUP IN MUNTOK SUB DISTRICT, WEST BANGKA

2020 ◽  
Vol 5 (1) ◽  
pp. 21-25
Author(s):  
Ira Triswiyana ◽  
Ayu Permatasari ◽  
Juandi Juandi
Keyword(s):  
Sustainable Development ◽  
Freshwater Fish ◽  
Fish Farming ◽  
The Other ◽  
Survey Method ◽  
Local Market ◽  
Fresh Water Fish ◽  
Water Fish ◽  
Net Cage ◽  
Fish Productivity

Freshwater fish farming in West Bangka Regency is developing to meet the needs of the local market. Information about the distribution and production of fish farmers groups (Pokdakan) can be used as a basis for planning sustainable development. This research was conducted using a survey method in July - September 2019 in Muntok District, West Bangka Regency. Fifteen Pokdakan scattered in seven villages with the majority developing catfish commodities. There is only one group that belongs to the middle class, while the other group is still in the beginner class. Freshwater fish productivity reaches 3.2 tons per quarter. The majority of Pokdakan utilize former tin mines with step-in-net cage for fish farming so that their productivity is affected by the season. Continuity of production is needed so that the class of Pokdakan can increase.

scholarly journals Phage Specificity of the Freshwater Fish Pathogen Flavobacterium columnare

2011 ◽  
Vol 77 (21) ◽  
pp. 7868-7872 ◽  
Author(s):  
Elina Laanto ◽  
Lotta-Riina Sundberg ◽  
Jaana K. H. Bamford
Keyword(s):  
Freshwater Fish ◽  
Phage Therapy ◽  
The Other ◽  
Flavobacterium Columnare ◽  
Fish Pathogen ◽  
Fish Farms ◽  
Content Type

ABSTRACTFlavobacteria and their phages were isolated from Finnish freshwaters and fish farms. Emphasis was placed on finding phages infecting the fish pathogenFlavobacterium columnarefor use as phage therapy agents. The host ranges of the flavobacterial phages varied, phages infectingF. columnarebeing more host specific than the other phages.

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