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Registros recuperados: 10
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Análisis de la estructura de tallas y la relación peso-longitud del Dorado (Coryphaena hippurus) capturado en Mazatlan Sinaloa, México OceanDocs
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
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Change in size-at-maturity of the yellownose skate Dipturus chilensis (Guichenot, 1848) (Elasmobranchii: Rajidae) in the SW Atlantic Neotropical Ichthyology
Paesch,Laura; Oddone,María C..
A total of 3518 specimens (1607 males, 1911 females) of Dipturus chilensis were sampled. Males ranged from 44.0 to 99.0 cm and females from 45.0 to 110.0 cm. Total length composition of the grouped catches differed significantly among sexes, with females being larger than males. The sex ratio favored the females. The total length at which 50% of the specimens were retained by the gear was 69.0 cm for the males and 73.0 cm for the females. A sub-sample of 124 specimens (48 males, 76 females) was analyzed for reproductive assessment. For the males, size at 50% maturity was estimated at 78.5 cm, while for the females this parameter was estimated at 81.4 cm. Preliminary observations on the description of the egg capsules are also provided.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clasper; Fishery-dependent samples; Rajid; Reproduction; Size composition.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200009
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Effect of local hydroclimate on phytoplankton groups in the Charente estuary ArchiMer
Guesdon, Stephane; Stachowski-haberkorn, Sabine; Lambert, Christophe; Beker, Beatriz; Brach-papa, Christophe; Auger, Dominique; Bechemin, Christian.
This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and...
Tipo: Text Palavras-chave: Hydroclimate; Estuary; Phytoplankton; Size composition; Nutrients; Trace metals.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00349/46005/45674.pdf
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Flutuações temporal e espacial de abundância e composição de tamanho de Aegla castro Schmitt (Crustacea, Anomura, Aeglidae) no Buraco do Padre, Ponta Grossa, Paraná, Brasil Zoologia
Swiech-Ayoub,Bianca de Paula; Masunari,Setuko.
A study of the annual abundance fluctuation, temporal distribution and size composition of Aegla castro Schmitt, 1942 was carried out at the Buraco do Padre, Quebra-Perna River, Tibagi River Basin, in the municipality of Ponta Grossa, Paraná State. The samplings were done monthly, from February/97 to January/98 with the aid of a hand net and screens at three stations, under an effort of 120 minutes. The average air temperature ranged from 15.0ºC (May, July, September and October) to 24.3ºC (December and January), and the water temperature from 15.8ºC (July) to 22.3ºC (December). The dissolved oxygen oscillated from 95.7% (March) to 100. 2% (August) saturation, and the pH from 6.1 (July) to 7.2 (September). The water flow speed varied from 0.2 m/s to 1.2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crustacea; Decapoda; Aegla castro; Abundance; Size composition; Ponta Grossa; Paraná State.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000300032
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La pesquería de la concha prieta (Anadara tuberculosa y Anadara similis) en el 2009: indicadores pesqueros y condición reproductiva en la zona sur y norte de Ecuador OceanDocs
Mora, E.; Moreno, J.; Jurado, V.; Flores, L..
Un análisis de los principales indicadores pesqueros (CPUE, esfuerzo y talla media de captura) fue realizado en base a información obtenida del seguimiento de la pesquería de la concha prieta durante el año 2009 en los sitios de desembarque más importantes. Los puertos de San Lorenzo y Hualtaco registraron los desembarques más altos (8.8 y 4.8 millones de conchas, respectivamente). Los rendimientos en CPUE oscilaron entre 95 y 122 conchas/conchero/día pesca,mientras que el esfuerzo promedio se encontró entre 38 y 331 concheros/día pesca. El porcentaje de conchas no comerciales fue superior al 45% (A. tuberculosa) y a 35% (A. similis) en cada puerto de desembarque. La condición reproductiva fue muy variable a lo largo del año en relación a los estadios de...
Tipo: Journal Contribution Palavras-chave: Cockle fisheries; Fishery surveys; Catch/effort; Sexual maturity; Size composition; Resource conservation.
Ano: 2010 URL: http://hdl.handle.net/1834/4795
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Obervations on the commercial light fishing operation in Ghana OceanDocs
Quartey, R.; Bannerman, P..
Light fishing operations (LFO) in Ghana is concentrated in the three major coastal municipalities of Greater Accra (Tema), Central (Mumford & 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: Journal Contribution Palavras-chave: Lenght frequency; Body length; By catch; Fishery economics; Pelagic fisheries; Size composition; Thermocline; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 2005 URL: http://hdl.handle.net/1834/1267
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Results of the 2003 observer program on board the French purse seiner targeting Atlantic bluefin tuna in the Mediterranean sea ArchiMer
Fromentin, Jean-marc; Farrugio, Henri.
In 2003, IFREMER implemented an observer program on board of the French purse seiner targeting bluefin tuna (BFT) in the Mediterranean Sea to collect the size composition of catches. The protocol and the sampling design were established by IFREMER and the operations were carried out by two independent scientific observers (each one following a given boat over two distinguished fishing seasons). The 788 BFT measured by the two observers during the ~ 190 fishing days were mostly small/juveniles fish and solely represented 2.7% of the total catches. The sampling appears largely insufficient to be representative of this fleet and was furthermore strongly biased (big BFT being under-sampled). From our viewpoint, the implementation of a joint observer program on...
Tipo: Text Palavras-chave: Atlantic bluefin tuna; Catch; Size composition; Observer; Purse seine; Mediterranean; By-catch.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00194/30502/28912.pdf
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Situación actual del guariche Ucides occidentalis (Ortmann, 1897) en el estuario del río Chone, Manabí durante abril 2009 – 2010. OceanDocs
Moreno, J.; Ruíz, W..
Durante el período abril 2009 – 2010 se analizó la situación pesquera artesanal del recurso guariche o cangrejo rojo Ucides occidentalis (Ortmann, 1897) en el estuario del Río Chone, considerando desembarques comerciales y su hábitat “in situ”. El esfuerzo total promedio correspondió 84 recolectores/día pesca, con una captura promedio de 36 cangrejos o su equivalente a 6 sartas u atados. Se registró un 90% de ejemplares macho con talla promedio de 7.5 cm de ancho cefalotorácico (AC); mientras que el 10% de ejemplares hembras presento una talla promedio de 6.5 cm AC. El muestreo de densidad poblacional se lo realizo en 36 estaciones correspondiente a las seis localidades cangrejeras ubicadas en el estuario reportando una densidad de 0.7 cangrejos/m2....
Tipo: Journal Contribution Palavras-chave: Crab fisheries; Landing statistics; Catch/effort; Size-limit regulations; Size composition; Fishery surveys.
Ano: 2010 URL: http://hdl.handle.net/1834/4794
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Statistics of the European and associated purse seine and baitboat fleets, in the Atlantic Ocean (1991-2017) ArchiMer
Pascual-alayon, P; Floch, Laurent; N'Gom, F; Dewals, P; Irie, D; Amatcha, Ah; Amande, M-j.
The document presents an overall summary of the fishing activities of the European and assimilated purse seine and bait boat fleets operating in the eastern Atlantic Ocean over the period 1991-2017. We describe the annual changes in fleet technical characteristics (carrying capacity, size), fishing effort (fishing and searching days), extent of fishing grounds, catches and nominal Catch per Unit Effort by species, as well as the average individual weight by species. Maps are also presented indicating the fishing effort distribution in the Atlantic, as well as the spatio-temporal distribution of European and assimilated purse seine catches in 2017 compared to previous years (2010-2016).
Tipo: Text Palavras-chave: Tuna fishery; Yellowfin; Skipjack; Purse seiners; Catch/effort; CPUE; Species composition; Size composition.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60190/63533.pdf
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О связи размерной структуры Mnemiopsis leidyi в Черном море с динамикой его роста и размножения IBSS Repository
Заика, В. Е..
Показано, что Mnemiopsis leidyi, как и другие гребневики, имеет очень быстрый линейный рост, близкий к экспоненциальному, а также способен, при дефиците пищи, к "обратному росту", причем размеры и морфо­логия "похудевших" животных не позволяют отличить их от более молодых особей. Из-за этой особенности, по размерной структуре популяций мнемиопсиса невозможно судить об их возрастной структуре. В частно­сти, мелкие особи (длиной до 5 мм), встречаемые в малом числе, могут оказаться не молодью, а взрослыми. Поэтому периоды нереста мнемиопсиса необходимо выделять по массовому количеству личинок длиной 1 - 2 мм и активной откладке яиц животными. Описаны случаи явного нереста, особенности роста и развития ли­чинок мнемиопсиса в Черном море.
Tipo: Journal Contribution Palavras-chave: Mnemiopsis leidyi; Линейный рост; "обратный рост"; Размерный состав; Linear growth; "reverse growth"; Size composition.
Ano: 2005 URL: http://repository.ibss.org.ua/dspace/handle/99011/219
Registros recuperados: 10
Primeira ... 1 ... Última
 

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