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Search Results: 1 - 10 of 58 matches for " teleostei "
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Thinlip grey mullet Liza ramada (Mugilidae) caught in a
Bror Jonsson,Nina Jonsson
Fauna Norvegica , 2009, DOI: 10.5324/fn.v26i0.571
Abstract: Two individuals of thinlip grey mullet Liza ramada were collected in a southern Norwegian brook (58° 22’ N, 8° 37’ E) on 12th September 2007. The fish were 8.7 and 9.0 cm in total length, 6 and 7 g in total mass, and most probably in their first year of life. The nearest known spawning area of the species is south of the English Channel, meaning that they had probably moved at least 900 km across the North Sea during their first growth season. To our knowledge, this is the first published observation of the catadromous thinlip grey mullet from a Scandinavian freshwater course.
Immunocytochemical identification and distribution of the cell types in the pituitary gland of Bagrus bayad (Teleostei, Bagridae)  [PDF]
Mostafa A. Mousa, Noha A. Khalil, Amal M. Amal M. Hashem
World Journal of Neuroscience (WJNS) , 2012, DOI: 10.4236/wjns.2012.21004
Abstract: Immunocytochemical identification of the different cell types in the pituitary gland of Bagrus bayad was performed using antisera against mammalian (human and rat) and piscine hormones. The adenohypophysis was composed of rostral pars distalis (RPD), proximal pars distalis (PPD) and pars intermedia (PI). Prolactin and adrenocorticotrophic cells were located in the rostral pars distalis of the pituitary. Gonadotrophic and growth hormone cells were distributed in the proximal pars distalis, but gonadotrophic cells appear also at the border of the pars intermedia. Somatolactin cells, as well as alpha-melanotrophic cells were located in the pars intermedia of B. bayad pitui-tary. The prolactin (PRL) cells were distributed in the RPD stained with orange G and showed strong immunoreactivity with antiserum to chum salmon. The adrenocorticotrophic (ACTH) cells were lead hema-toxylin-positive (PbH+) and showed strong im- mu-noreactivity with anti-human ACTH; these cells bor-dered the neurohypophysis and grouped in islets be-tween PRL cells in the RPD. Growth hormone (GH) cells were densely distributed with the gonadotrophic (GTH) cells in the PPD. They were orange G positive and reacted with antiserum to chum salmon. GTH cells were located in the central area of the PPD and in the external border of the PI. These cells were Alcyan Blue and PAS positive, and immunostained with anti-chum salmon GTH Iβ and anti-chum salmon GTH IIβ. In addition, antiserum to rat thyrotropin stimulating hormone β (TSHβ) reacted positively to the GTH cells. These results suggest that GTH I, GTH II and TSH are synthesized in the same cells in the pituitary of B. bayad. The PI was composed mainly of PbH+ cells and a PAS+ cell adjacent to the neurohypophysis. The PAS+ cells from the PI bound specifically to anti-chum somatolactin. Anti-alpha- melanin stimulating hormone (MSH) stained only the PbH+ (alpha-melanotrophic) cells of the PI.
Dorsolateral head muscles of the catfish families Nematogenyidae and Trichomycteridae (Siluriformes: Loricarioidei): comparative anatomy and phylogenetic analysis
Datovo, Aléssio;Bockmann, Flávio Alicino;
Neotropical Ichthyology , 2010, DOI: 10.1590/S1679-62252010000200001
Abstract: the skeletal muscles of the dorsolateral region of the head of the nematogenyidae and representatives of the all major clades of the trichomycteridae are described and illustrated. a hypothesis on the phylogenetic relationships among these taxa exclusively based on the surveyed musculature is presented. the single most parsimonious cladogram obtained from the phylogenetic analysis of the 36 myological characters gathered and 35 terminal-taxa mostly agrees with the previous hypotheses of trichomycterid intrarelationships. the copionodontinae and trichogeninae form a monophyletic lineage that is the sister-group to all remaining trichomycterids. the monophyly of the clades formed by glanapteryginae plus sarcoglanidinae; stegophilinae plus tridentinae plus vandelliinae; and the assemblage comprising all of these five subfamilies (tsvsg clade) is corroborated. two of our findings are, however, discordant with the previous prevailing hypotheses: the sister-group relationship among tridentinae and stegophilinae and the monophyly of the trichomycterinae lato sensu, i. e., including the genera scleronema and ituglanis. in addition, the previously proposed osteological synapomorphies supporting the close affinities of scleronema and ituglanis with the tsvsg clade were revised, revealing that they are either invalid or ambiguous. most of the synapomorphies herein proposed are homoplasy-free, with some of them corroborating the monophyly of weakly-supported groups, such as stegophilinae.
Registros novos e adicionais de teleósteos marinhos na costa brasileira
Caires, Rodrigo Antunes;Figueiredo, José Lima de;Bernardes, Roberto ávila;
Papéis Avulsos de Zoologia (S?o Paulo) , 2008, DOI: 10.1590/S0031-10492008001900001
Abstract: new data of the geographical distribution of several species of teleost fishes assigned to the brazilian coast, including some species never previously recorded, are presented. the serranids pseudogramma gregoryi (recorded from florida to venezuela), and plectranthias garrupellus (recorded from north carolina to caribbean sea) were found, respectively, in coast of ceará and in southeastern and southern brazilian coast. the two sole records the family caristiidae in brazilian coast are mentioned and discussed, and are given herein the first accounts of the species enchelycore carychroa (muraenidae) and chilomycterus antillarum (diodontidae) from southeastern brazilian coast, and of neobythites brasiliensis (bythitidae) from northeastern brazilian coast. we have also discussed the northernmost occurrence of calamus mu (sparidae), a species formerly circumscribed to the region between espírito santo and s?o paulo, and additional records of bascanichthys paulensis (ophichthidae), nezumia aequalis (macrouridae), antigonia combatia (caproidae) and notolycodes schmitti (zoarcidae).
Microscopic morphology and histochemistry of the digestive system of a tropical freshwater fish Trichomycterus brasiliensis (Lütken) (Siluroidei, Trichomycteridae)
Oliveira Ribeiro, Ciro Alberto de;Fanta, Edith;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000400007
Abstract: the digestive system of trichomycterus brasiliensis (lütken, 1874), a small sized tropical teleostean fish widely distributed in south america, was studied. tissue samples were prepared for light and scanning electron microscopy (sem). trichomycterus brasiliensis shows stratified esophagus epithelium with taste buds and goblet cells with neutral and acid mucus at the anterior region. the stomach is caecal, presenting a pyloric valve with neutral mucus cells. at the terminal portion it is surrounded by a thick muscular wall. the intestine shows two loops; the epithelium is single columnar, with acid and neutral mucus in goblet cells. multicellular intestinal glands are absent. granular cells are often seen in the mucosa, less in the submucosa but were not observed in the muscularis. after the intestine-rectal valve, the rectum shows lower mucosal folds, more goblet cells and a thicker muscularis. no lobes were observed at the liver. small regions of pancreatic tissue may be identified within the hepatic tissue mainly surrounding vessels and ducts. a compact pancreas may also be observed ventrally to the stomach and covering the bile duct. the possible significance of the heterogeneous character of the digestive tube mucosubstances is discussed. the digestive system of t. brasiliensis presents structural characteristics of a predator fish.
Ultraestrutura da espermatogênese do tamoatá, Hoplosternum littorale (Hancock) (Teleostei, Callichthyidae) do rio Amazonas
Matos, E;Matos, P;Oliveira, E;Azevedo, C;
Revista Brasileira de Zoologia , 1993, DOI: 10.1590/S0101-81751993000200004
Abstract: sequential cytological modifications of hoplosternum littorale (hancock) spermatogenesis were studied with electron microscopy from the spermatocyte to the mature spermatozoon. five stages of spermatical maturation were described. the spermatozoon is one of the primitive tupe, with head without acrosome and a tail with a type pattern.
Lycodes adolfi Nielsen & Foss , 1993 (Teleostei: Zoarcidae) recorded near Jan Mayen and in the eastern part of the Norwegian Sea
Ingvar Byrkjedal,Torleiv Brattegard,Peter Rask M?ller
Fauna Norvegica , 2009, DOI: 10.5324/fn.v28i0.562
Abstract: Specimens of Lycodes adolfi were collected from an epibenthic sampler at six stations near Jan Mayen and in the eastern part of the Norwegian Sea. The stations were at depths from 708 to 2150 m and all of them had subzero water temperatures. The records substantially increase the known distribution of this cold-water eelpout, previously known only from waters near Greenland.
Cottus gobio (Linnaeus, 1758), a new fish-species in Nord-Tr ndelag County, Norway
Gunn E. Frilund,Jarl Koksvik,Anton Rikstad,Hans M. Berger
Fauna Norvegica , 2010, DOI: 10.5324/fn.v29i0.612
Abstract: Frilund GE, Koksvik J, Rikstad A and Berger HM. 20092009. Cottus gobio (Linnaeus, 1758), a new fish-species in Nord-Tr ndelag County, Norway. Fauna Norvegica 29: 55-60. Cottus gobio, a freshwater sculpin, was discovered by electrical fishing in rivers draining to Murusj en in Lierne, Nord-Tr ndelag County in the middle of Norway. Until now, this sculpin has only been found in a few river systems in the south-eastern and north-eastern parts of Norway. Species specific characters (glands and fins) were used to distinguish C. gobio from the close relative C. poecilopus. The sculpin dominated the catches in all the investigated rivers. In August 2008 in the River Fiskl ysa, a total of 194 specimens were collected. Their length varied from 37 mm to 105 mm, indicating the presence of both juvenile (age 0) and adult individuals. In September 2008, qualitative sampling was conducted in another part of Fiskl ysa and in the rivers Kveelva and Murubekken. In River Fiskl ysa, the species was not registered above a presumably impassable waterfall about 1.6 km from Lake Murusj en. In River Kveelva sculpins were caught below a nine meters moderate waterfall, close to the outlet of Lake Kvesj en, but no sculpins were registered above the waterfall. This indicates that the waterfall is a possible barrier for further upstream dispersal into Lake Kvesj en. Sculpins were also registered in River Murubekken.The paper discusses possibilities for C. gobio being spread naturally or artificially into the river systems in Lierne. It is predicted that the dispersal most likely has been natural from populations in Sweden, as there are no distinct barriers preventing the sculpin from spreading westwards. The time-period of the dispersal, however, is still unknown, and the sculpin may still be expanding its home range in these water systems.
First record of Diaphus rafinesquii (Cocco, 1838) (Myctophidae) in the Norwegian Sea
Rupert Wienerroither,Otte Bjelland
Fauna Norvegica , 2013, DOI: 10.5324/fn.v32i0.1528
Abstract: The myctophid Diaphus rafinesquii is endemic in the North Atlantic and the Mediterranean and was for the first time found in the Norwegian Sea. The specimen was captured off northern Norway at about 71° N, representing the northernmost record so far. Meristic and morphometric comparisons showed no evident differences to specimens found in other areas of its distribution. Although the actual abundance and distribution of this species in Norwegian waters remained unclear, we emphasized the general high potential of mesopelagic species for indicating environmental short- and long-time changes by monitoring the faunal change.
A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)
Pinna, Mário C. C. de;Kirovsky, Alexandre L.;
Neotropical Ichthyology , 2011, DOI: 10.1590/S1679-62252011000300004
Abstract: a new species of sand-dwelling catfish genus pygidianops, p. amphioxus, is described from the negro and lower amazon basins. the new species differs from its three congeners in the elongate eel-like body, the short barbels, and the small caudal fin, continuous with the body, among other traits of internal anatomy. the absence of anal fin further distinguishes p. amphioxus from all other pygidianops species except p. magoi and the presence of eyes from all except p. cuao. the new pygidianops seems to be the sister species to p. magoi, the two species sharing a unique mesethmoid with a dorsally-bent tip lacking cornua, and a produced articular process in the palatine for the articulation with the neurocranium. pygidianops amphioxus is a permanent and highly-specialized inhabitant of psammic environments. additional characters are proposed as synapomorphies of pygidianops, including a hypertrophied symphyseal joint and associated ligament in the lower jaw; an elongate, laterally-directed, process on the dorsal surface of the premaxilla; and a rotated lower jaw, where the surface normally facing laterally in other glanapterygines is instead directed ventrally. these and other characters are incorporated into a revised phylogenetic diagnosis of pygidianops.
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