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| Registros recuperados: 173 | |
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| Abban, E.K.; Asante, A.K.; Falk, T.M.. |
| Ghana is one of the countries bordering theAtlantic Ocean on the coast of Africa. The country is located between latitudes 5" N and11" N and longitudes 1" E and 3" W Thecoastline of Ghana, approximately 550 kmlong, is dotted with about 50 lagoons andestuaries that, together with rocky capes and avariety of sandy bays, constitute its coastalwetlands (Armah 1993). These lagoons,estuaries and associated floodplains providehabitats for a variety of wildlife including birdsand fishes (Ntiamoa-Baidu 1991). With an estimated 40 000 ha surface area, the lagoonsare important fish and fisheries resources forassociated communities. The fish speciescomposition of these lagoons varies slightly,but a constant and predominant species is theblack-chinned tilapia,... |
| Tipo: Proceedings Paper |
Palavras-chave: Fish species; Stock assessment. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/698 |
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| Adam, Adel Mohamed Saleh. |
| The present study deals with the fisheries of two Sparid fish species in Abu Qir Bay. Family Sparidae represents about 17 % of the landed catch from the Bay. Among the family; genus Diplodus is generally caught by trammel nets, beach and purse seines but mostly by longlines. Two species of this genus were considered here for study. They are namely D. sargus and D. vulgaris where they represent by about 4.2% of the landed catch during the year 2008 in the Bay (GAFRD, 2008). The length weight relationship of both species under study showed a value of exponent “b” of very slight negative allometry. Analysis of the catch length structure of the two species revealed that the catch of D. sargus is composed of 21 length groups, the least length was 7.5 cm and the... |
| Tipo: Theses and Dissertations |
Palavras-chave: Stock assessment. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5091 |
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| Archarnbault, Benoit; Le Pape, Olivier; Baulier, Loic; Vermard, Youen; Veron, Matthieu; Rivot, Etienne. |
| We explore how alternative hypotheses on the degree of mixing among local subpopulations affect statistical inferences on the dynamics and stock assessment of a harvested flatfish population, namely, the common sole population in the Eastern Channel (ICES area VIId). The current paradigm considers a single, well-mixed, spatially homogeneous population with juveniles from all coastal nursery grounds along the French and UK coasts that contribute to a single adult population and one pool of eggs. Based on the available data and ecological knowledge, we developed a spatial Bayesian integrated life-cycle model that consists of three subpopulations (one near the UK coast and two near the French coast, denoted UK, West FR and East FR, respectively) supported by... |
| Tipo: Text |
Palavras-chave: Solea solea; Spatial life-cycle model; Coastal nurseries; Connectivity; Stock assessment; Hierarchical bayesian model. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00333/44430/44231.pdf |
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| Bacher, Cedric; Chai, Ai-ling; Goulletquer, Philippe. |
| The krlging technique Is now employed ln more and more fields: mlnlng (Journel. 1977), hydrology (Delhomme, 197B; Shamsi et al" 1988; Dingman et al" 1988), fishery (Conan, 1989) and ecology (Robertson, 1987; Schotzko and O'Keeffe, 1989, 1990). Recent developments of the mathematlcal theory tend to extend the number of applications where Il may be used. Baslcally defined for the case of a statlonary spatial process, It now encompasses more general processes assuming less and less strong hypotheses (Intrinsic hypothesls, Intrlnsic generalised hypothesis, disjunctive krlglng). In its most general formulation, it allows to study the spatial structure of a process including large scale or local trends. The basic idea remains to take Into account the spatial... |
| Tipo: Text |
Palavras-chave: Kringing technique; Stock assessment; Oysters; Crassostrea virginica; Chesapeake Bay. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00200/31110/29518.pdf |
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| Ben Abdallah, O.; Ben Hadj Hamida, N.; Jarboui, O.. |
| The experimental survey done, in august 2005, in coastal marine zone (0 - 20 m) of Zarzis showed the existence of numerous species of shellfishes of which Tricolia speciosa, Smaragdia viridis, Nassarius incrassatus, Cerithium vulgatum and Gibbulla umbilicaris are the most important gasteropods and, Pinctada radiate and Donax trunculus the main bivalves. The biomasses estimation, based on the method of swept area, in the studied zone showed that P. radiate is the most abundant species with about 20 000 tones, followed by C. vulgatum (7 645 tones) and T. speciosa (more than 1 000 tones). The Donax trunculus biomass is very low with only 13 tones. Finally, the abundance indexes distribution cartography permitted us to note that it varies from one species to... |
| Tipo: Journal Contribution |
Palavras-chave: Biomass; Cartography; Geographical distribution; Marine crustaceans; Shellfish; Stock assessment; Biomass; Geographical distribution; Shellfish; Stock assessment; Cartography; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_7033; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_1344. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4272 |
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| Bernal, C.; Canales, M.; Catasti, V.; Sepúlveda, A.; Ruíz, P.; Alarcón, R.; Núñez, S.; Oyarzún, C.; Gazitúa, S.; Claramunt, G.; Herrera, G.. |
| Se evalúan los stocks desovantes de anchoveta y sardina común mediante la aplicación del método de la producción diaria de huevos, durante la época de máxima actividad reproductiva del año 2003. Se diseñó un crucero de recolección de huevos y se efectuaron capturas de adultos de ambas especies entre la V (33°10’S) y X (41°20’S) Regiones. En la región costera entre la VIII y X Regiones, la condición reproductiva fue monitoreada a través de indicadores macroscópicos (IGS y estados de madurez sexual), indicando que ambas especies habrían iniciado su actividad reproductiva a partir de julio de 2003, con un máximo de actividad observado en septiembre para ambas especies. Desde la flota artesanal con puerto base en Calbuco, se obtuvieron hembras de sardina común... |
| Tipo: Report |
Palavras-chave: Stock assessment; Clupeoid fisheries; Fish eggs; Biomass; Spawning; Spawning populations; Stock assessment; Biomass; Spawning; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_14490. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1695 |
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| Bertignac, Michel; Auby, Isabelle; Sauriau, Pierre-guy; De Montaudouin, Xavier; Foucard, Julie; Martin, Sophie. |
| As part of a larger project financed by the European Union programme "Community initiative PESCA" on the study of "small scale fisheries" in Aquitaine (France), an estimation of the stock of clams in the Bassin d'Arcachon has been conducted. A two-stage stratified random sampling survey has been designed. Samples have been collected using a Hamon bottom sampler in 237 locations distributed over 24 km2. The clam Tapes philippinarum, which appeared in the basin following a series of aquaculture experiments in the mid eighties, is now the main species accounting for more than 90% of the abundance and the biomass, largely overcoming the European species Tapes decussata. The mean abundance and biomass (26 clams / m2 et l28g / m2) are above those estimated in... |
| Tipo: Text |
Palavras-chave: Palourde; Tapes philippinarum; Tapes decussata; Evaluation stock; Pêche; Pêche à pied; Echantillonnage; Bassin d'Arcachon; Clam; Tapes philippinarum; Tapes decussata; Stock assessment; Fishery; Sampling; Bassin d'Arcachon. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00105/21658/19240.pdf |
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| Bertignac, Michel; De Pontual, Helene. |
| The results of a pilot tagging study on hake (Merluccius merluccius), conducted in the northern part of the Bay of Biscay in 2002, indicate that growth rates for this stock may be currently underestimated because of biased estimates of age. The impact that such a bias may have on the stock dynamics and the trends of the key population parameters, recruitment, spawning-stock biomass (SSB), and mortality are investigated. Assuming new growth parameters, a new age-length key is derived and used to produce and catch-at-age data and abundance indices, which are then used to assess the stock. Bias in estimating age affects the absolute levels of fishing mortality and stock biomass estimates, and also impacts the trend in SSB. However, trends in fishing mortality... |
| Tipo: Text |
Palavras-chave: Tagging; Stock assessment; Simulation; Management; Growth; European hake; Age estimation. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2824.pdf |
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| Registros recuperados: 173 | |
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