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Provedor de dados:  OceanDocs
País:  Belgium
Título:  Age et croissance de <Pagellus bellottii> (sparidae) des côtes Mauritaniennes
Age and growth of <Pagellus bellottii> (Sparidae) of Mauritanian coasts
Autores:  Ghorbel, M.
Ould Yarba, L.
Bouain, A.
Data:  2006-03-13
Ano:  2004
Palavras-chave:  Scalimétrie
Âge
Croissance Sparidae <
Pagellus bellottii>
Age Growth Demersal fisheries Growth Age http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_186
Resumo:  Age and growth of <Pagellus bellottii> (Sparidae) of Mauritanian coasts : The red Pandora <Pagellus bellottii> is one of the most important demersal species in the fisheries of Mauritanian coasts. Several gears and fleet traditionally exploit it. The studies concerning this fish and particularly those of its age and growth are rare and haven’t used the adequate method, which founded on hard pieces like scale and vertebra. The objective of the present work is to contribute to the knowledge of the growth parameters of the red Pandora using the scales method not yet used in the studied area. To determine the age and to study the growth of <Pagellus bellottii> in Mauritanian coasts, we have used the scales of 544 individuals. We have token, 8 scales under the fin pectoral and we have read the age using a binocular magnifying glass provided with an ocular micrometer. The ray of scale (R) and the rays of different slowing down of growth ring are raised along a centerline. For the determination of number of slowing down of growth rings annually formed and to determine their appearance period, we have analyzed the monthly variations of marginal lengthening (AM). To study the linear growth, we have established the relations binding size (FL) and total ray of the scale (R). Using the software “FSAS” based on the nonlinear adaptation of Maquardt, we have arranged the growth curve and determined the linear growth parameters of the Von Bertalanffy model. To check the obtained results, we have used the method of Ben Salem and Daget. Finally we have described mass growth, by the Von Bertalanffy equation, which expresses the mass evolution depending on the time. The study of age and growth of <Pagellus bellottii> of the Mauritanian coasts by the scalimetry method showed a minimal value of marginal lengthening in December for males and females. The graphic representation of marginal lengthening showed two principal decreases: the first in June-July coincides with the period of spawning; the second in December correspond to slowing down of growth ring. The estimate of the age using the slowing down of growth rings, allows distinguishing 8 age groups for males and 7 age groups for females The values of theorical length obtained by the Von Bertalanffy equation were nearly similar to those calculated by retrocalcul. We announce consequently that the model of Von Bertalanffy applies perfectly to the growth of <Pagellus bellottii> in Mauritanian coasts. The linear growth is practically the same for the two sexes while the mass growth is in favor of the males.

تمت دراسة نمو سمك المرجان<Pagellus bellottii> بالسواحل الموريتانية اعتمادا على الحراشف. في بداية هذه الدراسة تبين أن فترة توقف النمو عند هذا النوع من السمك توافق شهر ديسمبر بواسطة الحساب الرجعي، حددنا الطول (LF) عند ظهور كل حلقة توقف النمو. مكن تطبيق النموذج الحسابي لVon Bertalanffy على هذه الأطوال من تحديد ثوابت النمو بالطول والوزن عند هذا السمك لكل جنس على حدة واتضح أن هذا النموذج ينطبق جيدا على نمو هذا السمك نظرا لتقارب الأطوال المحسوبة والأطوال المقدرة نظريا.

L’étude de l’âge et de la croissance de <Pagellus bellottii> des côtes mauritaniennes par la lecture des écailles (scalimétrie) montre que la valeur minimale de l’allongement marginal est enregistrée au mois de décembre pour les mâles et les femelles. L’examen des représentations graphiques de l’allongement marginal montre deux principales chutes : une chute en juin-juillet qui coïncide avec la période de ponte, une deuxième chute apparaît en décembre et correspond à la formation de l’anneau de ralentissement de la croissance. Les paramètres de la croissance linéaire L , K et t0 relatifs à l’équation de Von Bertalanffy ont été calculés à partir de deux méthodes basées sur des itérations. Une courbe de Von Bertalanffy a été ajustée aux données observées. Les valeurs des longueurs théoriques calculées à partir de l’équation de Von Bertalanffy sont très proches ou égales à celles déterminées par le rétrocalcul, aussi bien chez les mâles que chez les femelles. Concernant la croissance massique, nous avons établi d’une part les relations taille-masse et d’autre part, les relations masse-âge. Ces dernières ont été déduites de l’équation du modèle de Von Bertalanffy.
Tipo:  Journal Contribution
Idioma:  Francês
Identificador:  Bull. INSTM Salammbô, 31, p. 35-42

0330-0080

http://hdl.handle.net/1834/1165
Editor:  INSTM
Formato:  299104 bytes

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