oalib
Search Results: 1 - 10 of 85 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /85
Display every page Item
Revision of Aristocleidus (Monogenoidea: Dactylogyridae), rediscovery of Aristocleidus hastatus, and description of Aristocleidus lamothei n. sp. from the Peruvian Mojarra Diapterus peruvianus (Teleostei: Gerreidae) in Mexico
Kritsky, Delane C.;Mendoza-Franco, Edgar F.;
Revista mexicana de biodiversidad , 2008,
Abstract: the generic diagnosis of aristocleidus mueller, 1936 is emended based on a collection of 2 species of the genus from the gills of the peruvian mojarra, diapterus peruvianus (gerreidae), from a lagoon along the pacific coast of mexico. the genus is characterized in part by species having a deeply incised base of the ventral anchor with the tip of the superficial root conspicuously directed toward that of the deep root. aristocleidus hastatus mueller, 1936 is redescribed and aristocleidus lamothei n. sp. is described from d. peruvianus from the tres palos lagoon, guerrero state, mexico. the finding of a. hastatus on d. peruvianus in mexico represents new host and locality records for the species.
Estructura espacial de Eucinostomus argenteus (Pisces: Gerreidae) en la zona norte del Caribe colombiano
Pacheco,Maria; Paramo,Jorge; Sánchez,Claudia;
Acta Biológica Colombiana , 2010,
Abstract: this research was carried out to determine the spatial distribution of density (catch per unit area) - cpua and size structure of eucinostomus argenteus and their relationship with environmental variables in the north zone of the colombian caribbean sea. the data comes from a survey of fisheries research during the dry season (february of 2006) between puerto estrella ( la guajira ) and santa marta ( magdalena ). biological samples were taken with a bottom trawl net (< 50 m and 50- 100 m stratum of depth) following a systematic design survey. the mature fishes with higher sizes were mainly located in the sector between manaure and punta gallinas, where the continental shelf is very wide and the local oceanography is modulated by the seasonal upwelling. the juvenile fishes were found toward the south of the study area between boca camarones and the rio buritaca, close to the coast. in this sector the continental shelf is very narrow with high biological productivity for the presence of rivers, mangroves and sea grasses, which serve as feeding grounds and nursery habitat for e. argenteus. in general, our results suggest that environmental conditions were important determinants of spatial distribution of abundance and sizes of e. argenteus in the north zone of the colombian caribbean sea, with temperature and depth as variables that better predict the spatial distribution of this specie.
Estructura espacial de Eucinostomus argenteus (Pisces: Gerreidae) en la zona norte del Caribe colombiano  [cached]
Paramo Jorge,Pacheco Maria,Sanchez Claudia
Acta Biológica Colombiana , 2010,
Abstract: Esta investigación se llevó a cabo para determinar la distribución espacial de la densidad (captura por unidad de área) a€“ CPUA y de la estructura de tallas de Eucinostomus argenteus y su relación con las variables ambientales en la zona norte del Caribe colombiano. Los datos fueron se tomaron durante un crucero de investigación realizado en la época seca (febrero de 2006) entre Puerto Estrella (La Guajira) y Santa Marta (Magdalena). Las muestras biológicas se colectaron con una red de arrastre (en estratos de profundidad < 50 m y 50-100 m) siguiendo un dise o de muestreo sistemático. Los individuos maduros y de tallas mayores se encontraron distribuidos principalmente entre Manaure y Punta Gallinas, donde la plataforma continental es muy ancha y la oceanografía local esta modulada por la surgencia estacional. Los peces juveniles, se distribuyeron al sur del área de estudio, entre Boca Camarones y el Río Buritaca, cerca de la costa. En este sector la plataforma es muy estrecha y con alta productividad biológica por la presencia de ríos, manglares y pastos marinos, sirviendo como zona de alimentación y refugio para E. argenteus. En general los resultados sugieren que las variables ambientales son importantes para la distribución espacial de la abundancia y las tallas de E. argenteus en la zona norte del Caribe colombiano, siendo la temperatura y la profundidad las variables que predijeron mejor la distribución espacial de la especie.
Revision of Aristocleidus (Monogenoidea: Dactylogyridae), rediscovery of Aristocleidus hastatus, and description of Aristocleidus lamothei n. sp. from the Peruvian Mojarra Diapterus peruvianus (Teleostei: Gerreidae) in Mexico Revisión de Aristocleidus (Monogenoidea: Dactylogyridae), redescripción de Aristocleidus hastatus y descripción de Aristocleidus lamothei n. sp. de la mojarra peruana Diapterus peruvianus (Teleostei: Gerreidae) en México  [cached]
Delane C. Kritsky,Edgar F. Mendoza-Franco
Revista mexicana de biodiversidad , 2008,
Abstract: The generic diagnosis of Aristocleidus Mueller, 1936 is emended based on a collection of 2 species of the genus from the gills of the Peruvian mojarra, Diapterus peruvianus (Gerreidae), from a lagoon along the Pacific Coast of Mexico. The genus is characterized in part by species having a deeply incised base of the ventral anchor with the tip of the superficial root conspicuously directed toward that of the deep root. Aristocleidus hastatus Mueller, 1936 is redescribed and Aristocleidus lamothei n. sp. is described from D. peruvianus from the Tres Palos Lagoon, Guerrero State, Mexico. The finding of A. hastatus on D. peruvianus in Mexico represents new host and locality records for the species. Se completa la descripción de Aristocleidus Mueller, 1936 con base en 2 ejemplares recolectados de las branquias de la mojarra peruana, Diapterus peruvianus (Gerreidae), de una laguna situada en la costa del Pacífico de México. El género se caracteriza por tener la base del macrogancho ventral profundamente hundida, con la punta de la raíz superfcial dirigida marcadamente hacia la de la raíz profunda. Se redescribe Aristocleidus hastatus Mueller, 1936 y se describe Aristocleidus lamothei n. sp. de D. peruvianus de la laguna de Tres Palos, Guerrero, México. El hallazgo de A. hastatus en D. peruvianus representa un nuevo registro de hospedero y localidad.
The mangrove as a temporary habitat for fish: the Eucinostomus Species at Guaratuba Bay, Brazil (25o 52'S;48o 39'W)
Chaves, Paulo de Tarso C.;Otto, Gislaine;
Brazilian Archives of Biology and Technology , 1999, DOI: 10.1590/S1516-89131999000100009
Abstract: several coastal fish use the estuarine habitat during a part of their life cycle. these sites are considered good for the reproductive activity, as well as for the growth of larvae and juveniles. concerning the gerreidae, however, many studies reveal that most species leave the estuaries to reproduce at sea. at guaratuba bay, southern brazil, this family is represented by three genera and five species, which make an important fraction of the local assemblage. the present study investigated the populational structure and breeding habits of three eucinostomus species, in order to know what relationship exists between them and the mangrove. it was found that the guaratuba mangrove represents a transitory habitat for the life cycle of the eucinostomus species. the sub-adults grow in the mangrove throughout the year and leave this milieu in spring or summer, when they complete the gonadal maturation and presumably spawn. e. argenteus and e. gula do not return to the mangrove after spawning. the three species feed mainly on polychaetes, but differences occur with respect to the secondary components of the diet.
Distribution and size of the mojarra Diapterus rhombeus (Cuvier) (Actinopterygii, Gerreidae) in a Southeastern Brazilian bay  [cached]
Marcus Rodrigues da Costa,Rafael Jardim Albieri,Leonardo Mitrano Neves,Alex Braz Lacone Santos
Brazilian Journal of Oceanography , 2012, DOI: 10.1590/s1679-87592012000200010
Abstract: Diapterus rhombeus is one of the most abundant fish species in the Sepetiba bay, which is a 520 km2 semi-closed coastal area in Southeastern Brazil. The size and distribution of this species have been described in order to assess the use of the area as a rearing ground in both spatial and temporal (seasonal) dimensions. A fish sampling program was conducted monthly by using an otter trawl between October 1998 and September 1999, in three bay zones (outer, middle and inner), defined according to depth and salinity gradient. Highly significant differences were found for CPUEs (number and biomass) among seasons and zones. Size ranged from 50 to 230 mm TL, and three size-groups were defined according to a maturation scale (n = 1435): 1 - immature (< 80 mm Total Length - TL); 2- individuals at the first maturation (L50) (80-90 mm TL), and 3 - adults (L100) (> 100 mm TL). Immature and L50 individuals were more abundant (number and biomass) during Autumn in the inner zone, while adults (L100) predominated during Summer in the outer zone. Evidences of movements of young-of-the-year (50-90 mm TL) individuals from the inner to the outer zone were detected as they reach larger sizes (180 mm TL) in the second year of life. Condition (k) was higher in larger sized individuals in the outer zone during Spring, when they are apt to start the reproductive process. Two cohorts were detected according to modal progression: the first (smaller size) showing faster growth than the second, evidencing a slower growth rate as they reach larger size. Distinct size classes occupying different bay zones suggest that the age-groups optimize their coexistence by partitioning the available resources, avoiding intra-specific competition. Diapterus rhombeus é uma das espécies de peixes mais abundantes na Baia de Sepetiba, ambiente costeiro de 520 km2 de área semifechada no sudoeste do Brasil. O tamanho e distribui o dos indivíduos desta espécie foram descritos com o objetivo de determinar o uso das áreas de cria o numa dimens o espacial e temporal (sazonal). Um programa de amostragem de arrasto de fundo foi conduzido mensalmente entre outubro 1998 a setembro 1999, em três zonas da baía (externa, central, interna), definidas através de gradientes de profundidade e salinidade. Diferen as altamente significativas foram encontradas para CPUEs (número e biomassa) entre esta es do ano e zonas. O comprimento variou de 50 a 230 mm CT. Três grupos de tamanhos foram definidos de acordo com uma escala de matura o gonadal (n = 1435): 1 - imaturo (< 80 mm Comprimento Total - CT); 2- indivíduos e
Occurrence of Larvae and Juveniles of Eucinostomus argenteus, Eucinostomus gula, Menticirrhus americanus, Menticirrhus littoralis, Umbrina coroides and Micropogonias furnieri at Pontal do Sul beach, Paraná
Godefroid, Rodrigo Santiago;Santos, César;Hofstaetter, Marion;Spach, Henry Louis;
Brazilian Archives of Biology and Technology , 2001, DOI: 10.1590/S1516-89132001000400012
Abstract: despite its importance, most ichthyoplankton studies in the south-southeastern coast of brazil, have been accomplished on the continental shelf. regarding the beach environment, recognized as a nursery, little is known about the ichthyoplankton. we analyzed 288 samples collected with a 18 by 2 m seine net, 1 mm mesh and a conical plankton net, with a mesh of 300 mm and a 60 cm mouth. eucinostomus argenteus comprised 78 % of the larvae and juveniles caught in the samples. the occurrence of gerreids was strongly concentrated in the summer, while the menticirrhus littoralis, menticirrhus americanus and umbrina coroides were present during all seasons. m.littoralis was most abundant during spring, while m. americanus and u. coroides dominated during winter. for all species, the largest captures occurred during low tide. environmental preferences are indicated in the principal component analysis, with the larvae and juveniles of e. argenteus and e. gula positively correlated with smaller waves and smaller morphodynamism, whereas m. americanus, u. coroides and m. furnieri seem to prefer periods with lower temperatures and larger morphodynamism.
Occurrence of Larvae and Juveniles of Eucinostomus argenteus, Eucinostomus gula, Menticirrhus americanus, Menticirrhus littoralis, Umbrina coroides and Micropogonias furnieri at Pontal do Sul beach, Paraná  [cached]
Godefroid Rodrigo Santiago,Santos César,Hofstaetter Marion,Spach Henry Louis
Brazilian Archives of Biology and Technology , 2001,
Abstract: Despite its importance, most ichthyoplankton studies in the South-Southeastern coast of Brazil, have been accomplished on the continental shelf. Regarding the beach environment, recognized as a nursery, little is known about the ichthyoplankton. We analyzed 288 samples collected with a 18 by 2 m seine net, 1 mm mesh and a conical plankton net, with a mesh of 300 mum and a 60 cm mouth. Eucinostomus argenteus comprised 78 % of the larvae and juveniles caught in the samples. The occurrence of gerreids was strongly concentrated in the summer, while the Menticirrhus littoralis, Menticirrhus americanus and Umbrina coroides were present during all seasons. M.littoralis was most abundant during spring, while M. americanus and U. coroides dominated during winter. For all species, the largest captures occurred during low tide. Environmental preferences are indicated in the principal component analysis, with the larvae and juveniles of E. argenteus and E. gula positively correlated with smaller waves and smaller morphodynamism, whereas M. americanus, U. coroides and M. furnieri seem to prefer periods with lower temperatures and larger morphodynamism.
Gills scanning images of the seawater fish Eugerres brasilianus (Gerreidae)
Eiras-Stofella, Daura Regina;Charvet-Almeida, Patricia;
Brazilian Archives of Biology and Technology , 2000, DOI: 10.1590/S1516-89132000000400011
Abstract: the gills of the adult fish, eugerres brasilianus (gerreidae) were analyzed in a scanning electron microscope. the stratified epithelium was uniform on all parts of the branchial arch. concentric microridges were present on cells that form this epithelium and were mainly observed in the primary lamellae and pharyngeal region where mucous cells were also abundant. the ultrastructural features of e. brasilianus gills indicated that this was not a filtering species, and that the feeding habit included mainly the intake of small organisms. the results presently obtained agreed with other literature data which determined the feeding habit of this species by means of stomach content analysis and other aspects.
Distribución, abundancia y parámetros poblacionales de la mojarra Diapterus rhombeus (Pisces: Gerreidae) en la Laguna de Términos, Campeche, México
Ayala-Pérez,Luis Amado; Gómez-Montes,Blanca Andrea; Ramos Miranda,Julia;
Revista de Biología Tropical , 2001,
Abstract: diapterus rhombeus dominates the nektonic community of terminos lagoon and is associated to zones with submerged vegetation, temperatures between 27 and 33°c and salinity between 25 and 36.5 ups. a total of 3 024 individuals were collected with a trawl net in 23 sites between september 1997 and september 1998. the length-weight model parameters are a=0.0098; b = 3.155 with a 96% correlation. the growth parameters are l = 20.4 cm, k = 0.74 and to= - 4.207 and the total mortality coefficient is 3.526. fish length is 2.5 - 18.0 cm with a mode of 7.5 cm. recruitment is continuous with a peak from may to august. the species uses several habitats of the lagoon mainly for feeding and growth, reproduction probably occurs in the adjacent continental shelf. movements between continental shelf and the estuarine system represent a continuous energy flow.
Page 1 /85
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.