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Registros recuperados: 5
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Détermination de l'effort optimal de chalutage benthique dans le golfe de Tunis OceanDocs
Zarrad, R.; Gharbi, H.; Missaoui, H..
The production models of Schaefer and Fox are used to determine the optimal effort of benthic trawlers in Tunis Gulf. The necessary data for the application of these models were collected from services of General Direction of Fishing and Aquaculture (DGPA). They are related to the two fisheries which exploit the benthic resources : trawling and coastal fishing and are extended over 12 years (from 1988 to 1999). The unit of effort selected, which gives the best correlation coefficient is the number at days at sea times : The day number at sea time the engine power of the fleet. In the current exploitation state, the optimal effort is estimated at 15 benthic trawlers with an average power of 450 cv.
Tipo: Journal Contribution Palavras-chave: Chalutage benthique; Pêche; Golfe de Tunis Bottom trawling Coastal fisheries Fishing effort Benthos Coastal fisheries Fishing effort.
Ano: 2001 URL: http://hdl.handle.net/1834/1178
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Variabilité mensuelle du zooplancton et de l'ichtyoplancton dans le golfe deTunis OceanDocs
Zarrad, R.; El Abed, A.; Missaoui, H.; M’rabet, R.; Romdhane, M.S.; Jarboui, O..
Monthly variability of zooplankton and ichthyoplankton abundance and composition were studied in 6 stations in the Gulf of Tunis between February 2003 and January 2004. Plankton trawls were horizontal, in surface and at night. Study area seems to be influenced by climatic conditions and the outflow of Majreda River that affect the surface temperature and salinity. Copepods, with many abundance picks in the year, formed the most abundant group (84%) followed by cladocerans (8%) and chaetognaths (3%). The swarms of appendicularians, cladocerans and medusas then for zoe are in spring. The highest fish spawning periods was in summer then the highest larva abundance was in winter and summer.
Tipo: Journal Contribution Palavras-chave: Mesozooplankton; Variabilité mensuelle zooplancton; Ichtyoplancton; Golfe de Tunis Tunisia Tunis Gulf Ichthyoplankton Temporal variations Zooplankton Zooplankton http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2004 URL: http://hdl.handle.net/1834/1553
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Distribution spatiale de l'ichtyoplancton en été et en automne et conditions environnementales dans le golfe de Tunis OceanDocs
Romdhane, M.S.; El Abed, A.; Zarrad, R.; M’rabet, R.; Missaoui, H..
Pendant l’été et l’automne de l’année 2002, deux campagnes d’étude de l’ichtyoplancton ont été effectuées dans le golfe de Tunis. La température moyenne des eaux de surface a été de 25,51°c en été et 21,85°c en automne. Les œufs et les larves ont été plus abondants en été qu’en automne (360 œufs /10m² et 244 larves /10m² en été et 115 œufs /10m² et 174 larves /10m² en automne). Les paramètres environnementaux : température, salinité oxygène dissous, pH, chlorophylle a et abondance du mésozooplancton ne semblent pas avoir une influence directe sur la distribution spatiale de l’ichtyoplancton. Cependant, la bathymétrie semble avoir une influence sur cette distribution.
Tipo: Journal Contribution Palavras-chave: Mésozooplancton; Golfe de Tunis; Plankton; Zooplankton MED; Tunisia; Tunis Gulf Abundance Distribution Environmental factors Ichthyoplankton Zooplankton Distribution Environmental factors Zooplankton http://aims.fao.org/aos/agrovoc/c_35773 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2003 URL: http://hdl.handle.net/1834/1075
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Variabilite mensuelle du zooplancton et de l'ichtyoplancton dans le golfe de Tunis OceanDocs
Missaoui, H.; El Abed, A.; M'rabet, R.; Romdhane, M.S.; Zarrad, R.; Jarboui, O..
Monthly variability of zooplankton and ichthyoplankton abundance and composition were studied in 6 stations in the Gulf of Tunis between February 2003 and January 2004. Plankton trawls were horizontal, in surface and at night. Study area seems to be influenced by climatic conditions and the outflow of Majreda River that affect the surface temperature and salinity. Copepods, with many abundance peaks in the year, formed the most abundant group (84%) followed by cladocerans (8%) and chaetognaths (3%). The appendicularians, cladocerans and medusae had swarms in the summer, the creseis and the chaetognths in the autun and the zoae larvae in the spring. The highest fish spawning periods was in summer then the highest larva abundance was in winter and...
Tipo: Journal Contribution Palavras-chave: Community composition; Fish larvae; Ichthyoplankton; Temporal variations; Zooplankton; Zooplankton; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 2004 URL: http://hdl.handle.net/1834/4242
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Reproductive cycle and sex reversal of Pagellus erythrinus (Linnaeus, 1758) in gulf of Tunis (Central Mediterranean) OceanDocs
Zarrad, R.; Cherif, M.; Gharbi, H.; Jarboui, O.; Missaoui, H..
Dans ce travail, nous étudions le cycle sexuel et l’inversion sexuelle du pageot commun Pagellus erythrinus dans le golfe de Tunis. De février 2003 à janvier 2004, un total de 807 individus ont été échantillonnés mensuellement à partir des opérations de chalutage benthique. La longueur totale varie de 7,6 à 28,5 cm. L’espèce a été caractérisée par un hermaphrodisme protérogyne. Le sex-ratio (femelles / mâles) a été de 2,78. La saison de ponte s’étend d’avril à octobre et principalement de mai à juillet. Cette dernière est liée à l’élévation de la température des eaux de surface qui passe de 16 à 24°C. La première maturité sexuelle (L50) se situe chez les femelles à une longueur totale de 14,6 cm et chez les mâles à 15,8 cm. L’inversion du sexe a pris place...
Tipo: Journal Contribution Palavras-chave: Sexual maturity; Reproduction; Seabream fisheries.
Ano: 2010 URL: http://hdl.handle.net/1834/4691
Registros recuperados: 5
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