Consulta: subjectFacets:"Biological sampling"
Registros recuperados: 16
Data/hora: 11/06/2024 00:35:35

Sampling for a bacteriological study of aquatic enrironments
Provedor de dados: 5
Autores: Troussellier, M; Baleux, B; Andre, P.
Using water samples from several observation levels of a brackish lagoon, statistical solutions are offered for the sampling optimisation of bacteria viable counts. The variability between plate count is studied by the mean of the Taylor's power law. The sampling strategy optimisation, including several sources of variability, is realized by hierarchical analysis of variance and the estimation of the sampling cost of each source. This optimisation procedure results in a great increase of the relative efficiency of the sampling design and allow to obtain significant differences between the bacterial concentrations. The effect of the reduction of the total sampling effort on the precision of these average concentrations pointed out the scientific and...
Tipo: Text
Palavras-chave: Bacteria; Abundance; Variance analysis; Microbiological analysis; Lagoons; Brackishwater environment; Bacterial counters; Biological sampling.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1984/acte-941.pdf

Biological sampling of non-quota species.
Provedor de dados: 5
Autores: Dunn, M. R.; Rogers, S. I.; Morizur, Yvon; Tetard, Alain; Aublet, B; Le Niliot, Ph; Miossec, Dominique.
The objective of this study was to develop an effective biological sampling programme for fish species in the English Channel (ICES Divisions Vild and Vile) which are not subject to quota management, and to prepare these data for use in multispecies, multi-fleet models being developed by the Channel Fisheries Study Group. Length and age data were coIlected for six non-quota species, and length data for a further five species. The samples were coIlected over a period of two years from important ports on the French and UK coasts. The exploitation patterns of each species were described by allocating catches from similar catching gears, regions, seasons and target species into common units referred to as métiers. The most important métiers in terms of landed...
Tipo: Text
Palavras-chave: Biological sampling; Commercial species; Exploitation; Fishery management.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00304/41514/40722.pdf

Muestreo de desembarque de caballa (Scomber japonicus) en el puerto de Mar del Plata, período noviembre 2003-diciembre 2004 y resultados de la campaña de estimación de la biomasa de diciembre de 2004
Provedor de dados: 20
Autores: Perrotta, R.G.; Garciarena, A.D.; Madirolas, A.; Cabreira, A.
Chub mackerel (Scomber japonicus) landings corresponding to November 2003-January 2004 and November 2004-January 2005 fishing seasons were analyzed at the Mar del Plata port (Argentina, SW Atlantic). Fourty one samples were taken to measure total length exclusively and 4 sub-samples to record individual data (total length, weight, sex, sexual stage, age according to otoliths reading). Total length ranged 20-50 cm (1 and 8 years old). The most abundant sizes, between 32-37 cm, corresponded to ages 3 and 4, respectively. Most of the fish caught were adult (95%) and mature (85%) specimens. Length-weight, length-age relations were calculated and length-growth, weight-growth parameters estimated. The catch per unit of effort, of high variability (0-2,455 kg...
Tipo: Journal Contribution
Palavras-chave: Landing statistics; Biological sampling; Growth; Fishing effort; Echo surveys; Biomass; Growth; Biomass; Fishing effort; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24027.
Ano: 2009
URL: http://hdl.handle.net/1834/3455

Calamares de importancia comercial en Argentina. Biología, distribución, pesquerías y muestreo biológico
Provedor de dados: 20
Autores: Brunetti, N.E.; Ivanovic, M.L.; Sakai, M.
An overview of the available information on the commercially important squid species distributed in the Argentine Sea and adjacent zones is given. It includes the most representative characteristics to identify the species and general information on their biology, distribution and fisheries. A biological sampling designis presented, with particular emphasis on the identification of sexual maturity stages. The world market of the squid resources has considerably risen in the last decades and one of the most important fishery zones is placed in the Southwest Atlantic region (Area 41, FAO), where squid represent 25. of the total landings. Illex argentinus, sustains the second fishery in volume, with landings reaching 612.000 tonnes in 1999. Other species,...
Tipo: Book
Palavras-chave: Squid fisheries; Geographical distribution; Animal morphology; Sexual maturity; Biological sampling; Commercial fishing; Landing statistics; Geographical distribution; Animal morphology; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_421; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 1999
URL: http://hdl.handle.net/1834/2336

Análisis de la estructura de tallas y la relación peso-longitud del Dorado (Coryphaena hippurus) capturado en Mazatlan Sinaloa, México
Provedor de dados: 20
Autores: Zuñiga, M.; Ortega-García, S.; Arias-Aréchiga, J.
En el sur del Golfo de California, en el Puerto de Mazatlán, Sinaloa, el dorado(Coryphaena hippurus) soporta una pesquería artesanal y deportiva de gran importancia. Sin embargo, los estudios biológico-pesqueros para esta área son muy escasos. Durante el periodo de julio de 2000 a diciembre de 2001 se realizaron muestreos biológicos mensuales en las flotas deportiva y artesanal. Se encontró un intervalo de tallas de 47 a 164 cm de longitud furcal (LF) para la flota deportiva y para la flota artesanal de 38 a 137 cm LF. En promedio la captura en ambas flotas se sostiene por organismos entre 55 y 100 cm LF. El crecimiento del total de los organismos muestreados en ambas flotas fue alométrico. El resultado de la prueba T2 Hotelling demostró que existen...
Tipo: Journal Contribution
Palavras-chave: Size composition; Weight-length relationships; Biological sampling; Artisanal fishing; Sport fishing.
Ano: 2010
URL: http://hdl.handle.net/1834/4839

La comunidad bentónica intermareal de Brachidontes rodriguezii (D'Orb.) y su relación con el efluente cloacal de la ciudad de Mar del Plata (38° S)
Provedor de dados: 20
Autores: Vallarino, E.A.
El mitílido Brachidontes rodriguezii es el organismo estructurante de una compleja comunidad intermareal que se desarrolla sobre los sustratos intermareales duros (cuarcíticos y limo- loessoides), en el sudeste de la provincia de Buenos Aires (Argentina). El presente estudio se desarrolló durante los años 1997, 1998, 1999 y 2000, en áreas costeras de los alrededores de Mar del Plata (Camet); Santa Clara del Mar (Santa Elena) y en Mar de Cobo. Se determinaron cuatro estaciones de muestreo en la zona de Camet (área impactada) y dos áreas control en Santa Elena y Mar de Cobo. En cada muestreo se tomaron muestras biológicas, de sedimento retenido y de Materia orgánica, así como de las variables ambientales: temperatura, salinidad, oxígeno disuelto, turbidez y...
Tipo: Theses and Dissertations
Palavras-chave: Intertidal environment; Biological sampling; Environmental factors; Pollution effects; Spatial variations; Seasonal variations; Biomass; Intertidal environment; Environmental factors; Biomass.
Ano: 2002
URL: http://hdl.handle.net/1834/2955

Estimación de la biomasa de los recursos demersales en el golfo de Guayaquil (junio 2007)
Provedor de dados: 20
Autores: Herrera, M.; Peralta, M.; Coello, D.; Elías, E.; León, J.; Cuadra, T. de la.
Se presentan los resultados obtenidos del crucero T07/06/02 D, realizado a bordo del B/I TOHALLI del Instituto Nacional de Pesca, en el Golfo de Guayaquil del 3 al 21 de junio de 2007; el estudio se complementa con información sobre condiciones físicas, químicas y planctónicas del medio marino. Tanto densidades como biomasas de las principales especies capturadas presentan disminución en sus estimados, lo que reafirma el paulatino decremento reportado en campañas anteriores. La especie chazo y camotillo presentan una distribución un tanto similar, la primera cercana al límite oeste del Golfo, en tanto que la segunda comprendió la parte central del mismo. Las densidades planctónicas obtenidas serían el resultado de condiciones oceanográficas actuales...
Tipo: Journal Contribution
Palavras-chave: Demersal fisheries; Biomass; Density (population); Biological sampling.
Ano: 2010
URL: http://hdl.handle.net/1834/4797

Improvements in the Ghanaian tuna statistics system
Provedor de dados: 20
Autores: Quartey, R.; Bannerman, P.
Light fishing operations (LFO) in Ghana is concentrated in the three major coastal municipalities of Greater Accra (Tema), Central (Mumford &amp; Elmina) and Western (Sekondi) Regions; these areas have the port facilities for landing of the catch by the larger inshore vessels that operate the purse seine fishery in Ghana and which predominantly operate the light attraction. Currently there are about 250 registered inshore vessels in the country whose sizes range between 39 – 60 feet , only a small fraction are actually working at the moment due to problems with spare parts and operations. Light attraction is the technique of aggregating fish by artificial light; and light fishing is the process of fishing the attracted fish by hooking, gill-netting or by...
Tipo: Report
Palavras-chave: Age composition; Biological sampling; Exclusive economic zone; Exploitation; Fish catch statistics; Tuna fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093.
Ano: 2005
URL: http://hdl.handle.net/1834/1266

Etat des lieux de la filière de transformation artisanale des produits halieutiques au Sénégal
Provedor de dados: 20
Autores: Mbaye, Lamine.
ACDI;CRDI; République Française,  Ministère des Affaires Etrangéres; CDE; Enda Graf Sahel;
Tipo: Theses and Dissertations
Palavras-chave: Processing fishery products; Biological sampling; Data collections; Marketing and distribution; Fisheries.
Ano: 2005
URL: http://hdl.handle.net/1834/5001

Planktonic copepods from coastal and inshore waters of Tudor Creek, Mombasa
Provedor de dados: 20
Autores: Revis, N.; Okemwa, E.
Fifty two free swimming planktonic copepod species were identified from the samples collected from three stations in Tudor Creek, Kenya. This appears to be the first systematic account of copepods reported from the coastal and inshore waters of Kenya.
Tipo: Journal Contribution
Palavras-chave: Copeda; Biological sampling; Taxonomy; Zooplankton; Taxonomy; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 1986
URL: http://hdl.handle.net/1834/1290

Two simple methods for recording points when using photography and point sampling techniques
Provedor de dados: 20
Autores: García, C.B.
A short reviewon pnotography and potnt sampling techniques as sarnpling tools for hard bottom communities ís given. Two methods for recording points are introduced.
Tipo: Journal Contribution
Palavras-chave: Biological sampling; Benthos; Statistical sampling; Photography; Benthos; Photography; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_5808.
Ano: 1990
URL: http://hdl.handle.net/1834/3893

Pesca exploratoria del recurso dorado (Coryphaena hippurus) frente a la costa ecuatoriana durante marzo de 2010
Provedor de dados: 20
Autores: Herrera, M.; Coello, D.; Peralta, M.; Elías, E.; Cajas, J.; Castro, R.; Pesantes, F.; Chavarría, J.
Del 9 al 21 de marzo de 2010, se realizó el Crucero T10/03/01 durante el cual se efectuaron 10 lances de pesca entre 01º21.39' N-03º 02.55' S y entre las longitudes 080º 32.20' W-082º 57.08' W, empleando un palangre de superficie doradero. En los lances realizados frente a Esmeraldas y Manabí, se registraron las mayores capturas, con especímenes con mayor talla y peso promedio, con una temperatura superficial promedio de 27 ºC y termoclina ubicada entre los 10 y 50 m de profundidad con la isoterma de 20 ºC, próxima a la profundidad de cala de la línea de pesca. Hacia el sur (lances 7 al 10), ubicados frente al sur de Manabí, Península de Santa Elena y Golfo de Guayaquil. Las capturas estuvieron representadas por especímenes con talla y peso promedio...
Tipo: Journal Contribution
Palavras-chave: Exploratory fishing; Cruise reports; Biological sampling; Longlining; Thermocline; Feed composition; Stomach content; By catch.
Ano: 2010
URL: http://hdl.handle.net/1834/4799

Diversidad de peces demersales en la plataforma continental del Ecuador
Provedor de dados: 20
Autores: Coello, D.; Herrera, M.
A partir de información colectada de cuatro cruceros de investigación a bordo del B/l Tohalli, se analiza la diversidad de peces óseos y elasmobranquios presentes en la plataforma continental del Ecuador. Los valores medios de diversidad estimados indican que tanto las poblaciones de peces óseos y condrictios demersales hasta los 120 m de profundidad presenten heterogeneidad, con un grado significativo de organización. Las fluctuaciones en el índice de diversidad en las diferentes subáreas y estratos estarán relacionadas probablemente con la variabilidad climática. Los mínimos observados se deducen como resultado de la dominancia de Raja equatorialis, R. velezi, Pomadasys sp., y Prionotus stephanophrys, así como un descenso en el número de especies...
Tipo: Journal Contribution
Palavras-chave: Demersal fish; Species diversity; Biological sampling.
Ano: 2010
URL: http://hdl.handle.net/1834/4803

Aspectos económicos de la pesquería de caballa (Scomber japonicus) y muestreo de desembarque en el puerto de Mar del Plata.
Provedor de dados: 20
Autores: Perrotta, R.G.; Tringali, L.S.; Izzo, A.; Boccanfuso, J.; López, F.; Macchi, G.J.
Movements pattern records of the Mar del Plata inshore fishing fleet during the 1997/98 and 1998/99 chub mackerel fishing seasons (October-January) allowed to observe that there is coincidence between the decrease of the 1983-1997 catches with respect to years previous to the 1975/76 "critical season" and a reduction of the inshore fleet fishing grounds which modifies accessibility of the fleet to the chub mackerel schools. Biostatistical and gonadal development results obtained in the Mar del Plata area (i.e., presence of adults during almost the whole fishing season which overlaps with the spawning season) do not differ significantly from those obtained during previous fishing seasons. As recommended in previous papers, chub mackerel fishing operations...
Tipo: Journal Contribution
Palavras-chave: Catch statistics; Biological sampling; Fishing grounds; Population structure; Costs; Population structure; Fishing grounds; Costs; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_2947; Http://aims.fao.org/aos/agrovoc/c_1922.
Ano: 2000
URL: http://hdl.handle.net/1834/2542

Estudios de distribución de la anchoíta (Engraulis anchoita)en un área de extensión reducida. I. Densidades mínimas de muestreo para la estimación de algunos parámetros poblacionales
Provedor de dados: 20
Autores: Gru, D.L.; Hansen, J.E.
Results of a research cruise carried out to estimate some biological parameters of anchovy (Engraulis anchoita), during the major spawning season, were analyzed in order to determine the minimum number of samples required to obtain unbiased values. Twelve samples of fishes were taken within an area of 607 nm². Size (total length)distributions, slope of the length-weight relationship, sex ratio and age population structure were considered. Results suggest that those parameters should be estimated by eight or more samples (corresponding to 76 nm² each).
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Size distribution; Sex ratio; Age composition; Biological sampling; Age composition; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014.
Ano: 1986
URL: http://hdl.handle.net/1834/2029

Muestreo bioestadístico de pescado en el puerto de Mar del Plata. Anchoíta (Engraulis anchoita). Período 1986-1990
Provedor de dados: 20
Autores: Hansen, J.E.
This paper deals with the commercial landings of bonaerensis anchovy at the Port of Mar del Plata (Buenos Aires province,Argentina), during the years 1986 to 1990. The mean catch was 15,501t per year. A total of 59 fish samples were taken for total length distributions (N=20164), and 24 sub-samples (N=2370) were analyzed to record individual data (length, weight, sex, sexual stage, age fromotoliths reading). The numer of fish per kg ranged between 28 and 53(mean=34.6). The mean size was 156.63 mm, and the most abundant fish in the landings were those being 3 and 2 years old, as it was also recorded during the period 1980-1985. Ordinary length-weight relationships by season were fitted, and the results were as follows:1) Autumn-Winter: W=8.5* 10-7* L3.392;...
Tipo: Journal Contribution
Palavras-chave: Length-weight relationships; Size distribution; Sexual maturity; Clupeoid fisheries; Biological sampling; Age composition; Commercial land use; Cohort analysis.
Ano: 1997
URL: http://hdl.handle.net/1834/5794