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Seasonal abundance, ecology, reproductive biology, and biochemical composition of Mesopodopsis orientalis W. M. Tattersall (Mysida) from a tropical estuary (Cochin backwater) in India

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Seasonal abundance, life history, and biochemical composition of Mesopodopsis orientalis were investigated based on samples collected over a period of one year in a tropical estuary, i.e., Cochin backwater. M. orientalis was recorded throughout the year and its peak abundance was observed during the monsoon period. The species produced more than one generation per year. The number of embryos carried by a single female ranged from 7 to 12, and was correlated with female length (P < 0.05), tending to increase with the size of the female. Egg size varied between 0.39 and 0.47 mm, with no correlation with length of the female, and size difference was observed in the same brood. Males and females attain sexual maturity after reaching a total length of 5 mm and 4.5 mm, respectively. With the exception of chlorophyll a, the environmental parameters, dissolved oxygen, salinity, pH, and water temperature do not have much influence on population density. The biochemical composition of the species reveals its high nutritional quality. Mature males and females showed higher protein contents than other stages, while carbohydrate content was high in immature stages, and lipid content was high in brooding females. L'abondance saisonnière, le cycle de vie et la composition biochimique de Mesopodopsis orientalis ont été étudiés à partir d'échantillons collectés au cours d'une période d'un an dans un estuaire tropical, la baie de Cochin. M. orientalis a été observé tout au long de l'année et son pic d'abondance a été observé durant la période de la mousson. Cette espèce produit plus d'une génération par an. Le nombre d'embryons portés par une seule femelle varie de 7 à 12, et a été corrélé avec la longueur de la femelle (P < 0,05), avec une tendance à augmenter avec la taille de la femelle. La taille des œufs varie entre 0,39 et 0,47 mm, il n'y a aucune relation avec la taille de la femelle et des différences de taille ont été observées dans la même portée. Mâles et femelles atteignent la maturité sexuelle après avoir atteind respectivement une longueur totale de 5 mm et 4,5 mm. A l'exception de la chlorophylle a, les paramètres environnementaux, oxygène dissous, salinité, pH, et température de l'eau n'ont pas beaucoup d'influence sur la densité de population. La composition biochimique de cette espèce révèle sa haute qualité nutritionnelle. Les mâles et les femelles mâtures montrent un contenu en protéines plus élevé que les autres stades; alors que les glucides sont plus élevés dans les stades immatures et les lipides plus élevés chez les femelles en gestation.

Affiliations: 1: National Institute of Oceanography, Regional Center, P.B. No. 1913, Salim Ali Road, Cochin-18, India

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/content/journals/10.1163/156854009x448835
2009-08-01
2016-12-11

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