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  • 1
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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
    Format: application/pdf
    Format: 21-44
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  • 2
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    Contribution à l'écologie de quelques taxons du zooplancton de Côte d'Ivoire. 2 - Dolioles, Salpes, Appendiculaires (2021)
    In:  http://aquaticcommons.org/id/eprint/7960 | 424 | 2012-03-07 15:19:38 | 7960 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: The seasonal variations of vertical distribution and abundance over the shelf are investigated for Doliolids, Salps and Larvacea. The 3 groups present many similar ecological features. Two maxima of abundance occur during the little and main cool seasons. The second maximum is usually the most important, except for Salps. The 3 taxons inhabit more superficial layers in cool than in warm seasons. This allows them to follow the phytoplankton maximum which drifts near the thermocline during the warm season. Pelagic Tunicates come back to the phytoplankton enrichment areas by the deeper Ivorian under-current. A relationship between the vertical distribution pattern and the life cycle (sexual or asexual generation) is suggested.
    Keywords: Biology ; Ecology ; Oceanography ; Côte d'Ivoire ; Doliolida ; Salps ; Larvacea ; Tunicates ; zooplankton ; vertical distribution ; life cycle
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 45-61
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  • 3
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    Contribution à l'écologie de quelques taxons du zooplancton de Côte d'Ivoire. 3 - Larves de décapodes et lucifer (2021)
    In:  http://aquaticcommons.org/id/eprint/7962 | 424 | 2012-03-07 15:19:01 | 7962 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: The warm season is the abundance period of the planktonic larval stages of Decapod Crustacea and of Lucifer faxonii in Ivoirian waters. Two or three maxima occur each year during the enrichments interrupting the warm and oligotropic season: February (small upwellings), June - some years - (first rains) and September - November (flood of rivers, end of cold season). Vertical distribution follows seasonal variations and varies little among the taxons. In a general way, Decapod larvae and Lucifer inhabit superficial layers in cold season and sink down during the warm season. It allows them to follow the maximum of primary production. Lucifer faxonii is breeding almost the year long. Breeds succede at rate of 3,7 weeks approximately.
    Keywords: Biology ; Ecology ; Oceanography ; Côte d'Ivoire ; Decapods larvae ; Lucifer ; zooplankton ; vertical distribution ; life cycle
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 63-84
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  • 4
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    Contribution à l'écologie de quelques taxons du zooplancton de Côte d'Ivoire. 4 - Euphausiaces (2021)
    In:  http://aquaticcommons.org/id/eprint/7963 | 424 | 2012-03-07 15:17:44 | 7963 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: Euphausiids vertical distribution on the Côte d'Ivoire continental shelf during different seasons, average zonal distrubution, mean distance to the shore, and seasonal variations in abundance computed for five years, suggest that the appearance, and the shifting of euphausiids across and along the shelf are related with the variations of the distance from the shore of the ivorian under-current. The author reports that Nyctiphanes capensis has not been found in the region.
    Keywords: Biology ; Ecology ; Oceanography ; Côte d'Ivoire ; Euphausiacea ; Nyctiphanes capensis ; zooplankton ; vertical distribution ; life cycle
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 85-90
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  • 5
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    Biologie de Ethmalosa Fimbriata (Bowdich) en Côte d'Ivoire. 3 - Étude des Migrations en Lagune Ebrié (2021)
    In:  http://aquaticcommons.org/id/eprint/7980 | 424 | 2012-03-08 12:52:44 | 7980 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: Spawning of bonga (Ethmalosa fimbriata Bowdich) takes place in polyhalin waters (Sppt. 〉 5ppt.). Migrations of young fish were studied by the mean of length data observed in different points of the lagoon from the artisanal fishery. Bonga remain 4 months in the hatchery (6 cm), before they expand in the whole lagoon until the age of 9/10 months. After this expansion phase, the fishes come back to the spawning fields (spawning length: 14/15 cm). Postspawning fishes leave the lagoon. Between birth and spawning, bonga are not affected by salinity changes, but reproduction occurs only in waters where salinity is higher than 5ppt.
    Keywords: Biology ; Ecology ; Fisheries ; Côte d'Ivoire ; Lagune Ebrié ; Ethmalosa fimbriata ; bonga ; spawning ; salinity
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 3-41
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  • 6
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    Biologie de la phase lagunaire de Penaeus duorarum en Côte d'Ivoire. Écologie et dynamique (2021)
    In:  http://aquaticcommons.org/id/eprint/7959 | 424 | 2012-03-07 15:20:41 | 7959 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: Ecology and dynamics of juvenile pink shrimp Penaeus duorarum were studied from weekly sampling in the Abidjan lagoon system. After a brief description of biogeography and principal features of climate, hydrology of Ebrié lagoon and Adiopodoumé bay were considered. Shrimp distribution were connected with the main environmental factors. Precise work was done in Adiopodoumé bay, especially concerning the succession of age classes, their growth on the nursery grounds, seasonal variation in abundance, size and distribution, in relation to environmental factors. These results, and former knowledges, allowed us to propose a general pattern for pink shrimp life history in Côte d'Ivoire.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Lagune Ebrié ; Adiopodoumé bay ; lagoons ; Penaeus duorarum ; northern pink shrimp
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-44
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  • 7
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    Biologie de la phase lagunaire de Penaeus duorarum en Côte d'Ivoire: biométrie et croissance. (2021)
    In:  http://aquaticcommons.org/id/eprint/8047 | 424 | 2012-03-09 08:58:14 | 8047 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: Principal biometric relations have been calculated for juvenile pink shrimp Penaeus duorarum, of Côte d'Ivoire lagoons. Growth has been studied from weekly sampling using Petersen's method and Von Bertalanffy's equation. Results are very similar to those obtained by the authors working in the same environmental conditions, especially concerning temperature.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Penaeus duorarum ; northern pink shrimp ; biometry ; growth
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 53-71
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  • 8
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    Biologie de Ethmalosa fimbriata (Bowdich) en Côte d'Ivoire. 2 - Étude de la croissance en lagune par la méthode de Petersen (2021)
    In:  http://aquaticcommons.org/id/eprint/8075 | 424 | 2012-03-09 08:55:58 | 8075 | Centre de Recherches Océanographiques, Côte d'Ivoire
    Details
    Publication Date: 2021-09-24
    Description: Ethmalosa growth curves (calculated by the least squares method) were determined from weekly samplings in Ebrié Lagoon. In order to obtain more accurate results than with a modal decomposition, the author used directly the modal values of the samples. One-year-old ethmalosa is about 15 cm long (fork length). For older fish, growth data seem to be disturbed by migrations: fish measuring 〉25 cm do not appear in the lagoon. Ethmalosa would spend the first year of its life in the lagoon, where it hatches and reproduces, and would migrate to the sea during its second year.
    Keywords: Biology ; Ecology ; Côte d'Ivoire ; Lagune Ebrié ; Petersen method ; Ethmalosa fimbriata ; Bonga shad ; growth
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-27
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  • 9
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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
    Format: application/pdf
    Format: 19-45
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  • 10
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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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