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  • 1
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    Bilan des recherches sur la crevette rose Penaeus duorarum notialis de Côte d'Ivoire et conséquences en matière d'aménagement (2021)
    In:  http://aquaticcommons.org/id/eprint/7936 | 424 | 2012-03-07 09:07:47 | 7936 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-06-26
    Description: A summary of results obtained from 1969 to 1977 is given. It concerns the biology of the species (ecology and distribution of the adults, behaviour and diel variation of catch rates, reproduction and larval migration, juveniles migration and recruitment at sea, sexual maturity, growth and mortality by marking experiments) and the history of the fishery (catches, efforts, seasonal variations of catch rates). The combined use of a dynamic pool model of Ricker and a production model of Fox leads to the evaluation of the potential of the stock. The simulation of different and combined fishery strategies on adults at sea and juveniles in lagoons, allows the evaluation of the consequences (in yield, value, biomass and potential fecundity) of the different proposed management procedures (reductions in fishing effort, closed seasons on both fisheries).
    Keywords: Fisheries ; Management ; Côte d'Ivoire ; Penaeus duorarum ; Northern pink shrimp ; stock assessment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-41
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  • 2
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    Biologie de Penaeus duorarum notialis en Côte d'Ivoire. 5 - Nouvelle étude de la croissance (2021)
    In:  http://aquaticcommons.org/id/eprint/8008 | 424 | 2012-03-08 12:44:41 | 8008 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-06-27
    Description: Von Bertalanffy's growth curve parameters K, L∞ and t'o have been estimated for female Penaeus duorarum by modal progression analysis, using the "successive maximums method" of Gheno and Le Guen (1968) for the polymodal size frequency curves analysis and the Tomlinson and Abrahamson's least squares method for parameters computations. For the male the authors used an original method to get an age/length key. The parameters were calculated by Gulland's graphical method (1969).
    Keywords: Biology ; Côte d'Ivoire ; Penaeus duorarum ; Northern pink shrimp ; growth assessment ; Von Bertalanffy method
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-19
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  • 3
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    Biologie de Penaeus duorarum en Côte d'Ivoire. 3. Étude des variations quotidiennes des rendements et leur relations avec l'hydroclimat. Essai de généralisation au Golfe de Guinée (2021)
    In:  http://aquaticcommons.org/id/eprint/8020 | 424 | 2012-03-08 12:37:09 | 8020 | Centre de Recherches Océanographiques, Côte d'Ivoire
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    Publication Date: 2021-06-28
    Description: Hydroclimatic conditions in the Gulf of Guinea between Senegal and Nigeria are briefly described emphasizing the seasonal variations of transparency. Analysis of the Abidjan based shrimp fleet allowed to the description of the seasonal variations of activity rhythms for Côte d'Ivoire, Ghana, and Nigeria. These rhythms are different between seasons, between fishing grounds, and sometimes even between depths on a given ground. These variations follow the turbidity ones. Diurnal activity is observed in very turbid waters, nocturnal and transition activity in clearer ones. The authors assume that the basic behaviour is a nocturnal one, but that the shrimp-trawlers catches reflect some apparently different ones resulting from diel variations in the stock availability. To explain the apparently diurnal behaviour observed most of the year over the whole Gulf of Guinea it is suggested that these generally benthic shrimps become nectonic at night when turbidity is very high. The results obtained in Ivory Coast, Ghana and Nigeria are compared to those from Senegal where hydroclimatic conditions are different. The similarities are emphasized. The differences in observed behaviour are supposedly caused by the cold season water temps which are sufficiently low to disturb the nor mal activity rhythm.
    Keywords: Biology ; Ecology ; Oceanography ; Côte d'Ivoire ; Gulf of Guinea ; Penaeus duorarum ; northern pink shrimp ; hydroclimate ; seasonal variations
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 71-104
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  • 4
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    Marquages de Penaeus duorarum notialis en Côte d'Ivoire. 2 - Migrations et mortalités (2021)
    In:  http://aquaticcommons.org/id/eprint/8004 | 424 | 2012-03-08 12:47:02 | 8004 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: Petersen disc tag marking experiments confirm the influence of animal size and marking time on the recapture rate. Westward migrations occur, probably following the Ivorian undercurrent. Catchability coefficients have been evaluated for the Grand-Bassam fishing ground and tentatively extrapolated to the other fishing areas. The extrapolated non weighted coefficient for the entire fishing areas is q=0.00069/fishing day for an area of 390 miles. The instantaneous coefficient of residual mortality X taken as a first and possibly slightly overestimated value of M the natural mortality, has been estimated at 0.155/month, strongly corroborating Berry's results (1967). This value is however much smaller than that given by earlier authors. It is suggested that q could have a higher value during the very first weeks of exploitation at sea, when the juveniles are concentrated near the lagoon outlets.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Penaeus duorarum ; migration ; tagging ; recapture ; mortality
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
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    Format: 21-44
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  • 5
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    Biologie de Penaeus duorarum (Burkenroad) en Côte d'Ivoire: croissance (2021)
    In:  http://aquaticcommons.org/id/eprint/7937 | 424 | 2012-03-08 06:32:18 | 7937 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: The Petersen method was used to make growth assessments from experimental data collected during 1966-67 and 1969-70. The parameters K and L ∞ were calculated from the Von Bertalanffy growth curve. There was very little difference between the two years although growth in 1969 appeared slightly greater. A comparison of our results in Côte d'Ivoire with those from Senegal and Gulf of Mexico showed that the greatest growth occured on the west African coast and especially off the Côte d'Ivoire.
    Keywords: Biology ; Côte d'Ivoire ; Penaeus duorarum ; Northern pink shrimp ; growth assessment ; Petersen method
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 17-48
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  • 6
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    Biologie de Penaeus duorarum (Burkenroad) en Côte d'Ivoire: 2 - ponte et migration (2021)
    In:  http://aquaticcommons.org/id/eprint/8519 | 424 | 2012-03-14 08:33:37 | 8519 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: The pink shrimp Penaeus duorarum spawns from 25 to 60m, mostly in summer (October to June). Size at first sexual maturity is 31 mm (carapace length). The observed difference with the Caribbean pink shrimp is analysed. Immature shrimps migrate all year round but a peak migration occurs from January to March (in summer) and is associated with maximum salinities. A secondary peak migration occurs in October corresponding to minimum salinity and maximum river discharge. The action of salinity on migration is discussed and a preponderant action of currents in the process is also suggested. Migration is also related to moon phase, tide and day-night cycles. Migration intensity as expressed by catch per unit of effort is maximum at night, during ebb tide, on new and full moon. Seasonal variation of mean migration size and abundance are related by a negative linear correlation on a logarithmic plot (R = 0.776). This phenomenon is perhaps related to competition for food.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Penaeus duorarum ; Northern pink shrimp ; spawning ; migration ; seasonal variations ; salinity ; currents
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
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    Format: 19-45
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  • 7
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    Marquages de Penaeus duorarum notialis en Côte d'Ivoire. 3 - Croissance (2021)
    In:  http://aquaticcommons.org/id/eprint/8005 | 424 | 2012-03-08 12:46:27 | 8005 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: The occurrence of seasonal variations in growth is confirmed. The mean annual growth curve obtained is not different from that obtained by modal progression analysis. The comparison with results obtained by other authors in Florida did not permit to point out any sensible difference and the author concludes that the phenomena are quite similar but that it would be better, for yield computations, to use the observed age-length keys instead of the computed parameters.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Penaeus duorarum ; growth ; seasonal variations
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 45-66
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  • 8
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    La pêche crevettière en Côte d'Ivoire. Bilan 1969-1970 et perspectives (2021)
    In:  http://aquaticcommons.org/id/eprint/7941 | 424 | 2012-03-07 15:44:39 | 7941 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-06-26
    Description: The evolution of the fishery of the pink shrimp Penaeus duorarum Burkenroad is analysed from its beginning in 1969 until the end of 1970. A rapid and general decline of the yield has been evident during this period. The actual shrimp fleet seems to be too big to allow an exploitation economically convenient of the stock.
    Keywords: Fisheries ; Management ; Côte d'Ivoire ; Penaeus duorarum ; northern pink shrimp
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 37-46
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  • 9
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    Biologie de Penaeus duorarum notialis en Côte d'Ivoire. 4 - Rélations entre la répartition et les conditions du milieu. Étude des variations du sex-ratio (2021)
    In:  http://aquaticcommons.org/id/eprint/8009 | 424 | 2012-03-08 12:43:47 | 8009 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-06-27
    Description: The analysis of the geographic and bathymetric distribution of Penaeus duorarum and, particularly P. d. notialis off Côte d'Ivoire and in its whole distribution area leads to the definition of the adult ecological requirements (temperature, salinity, grain size and sediment composition, organic matter) and the importance of the thermocline in the bathmetric distribution. The population structure study shows: (1) variations of size with depth, (2) variations of sex ratio, with size, depth and seasons.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Penaeus duorarum ; Northern pink shrimp ; stock assessment ; distribution ; sex-ratio variations
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-39
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  • 10
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    Simultaneous inversion of source parameters and attenuation factor using genetic algorithms (2005)
    In:  Bull. Seism. Soc. Am., Berlin, Schweizerbart'sche Verlagsbuchhandlung, vol. 95, no. 4, pp. 1401-1411, pp. L17608, (ISSN 0016-8548, ISBN 3-510-50045-8)
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    Publication Date: 2005
    Keywords: Seismology ; Source parameters ; Attenuation ; Quality factor ; Inversion ; seismic Moment ; Data analysis / ~ processing ; Jimenez ; Garcia ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
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