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Trypsin enzyme activity during larval development of Penaeus semisulcatus De Haan, 1844, fed on live feeds

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The growth, survival, and trypsin activity response of Penaeus semisulcatus larvae was examined with two different live feed regimes throughout larval development under laboratory conditions. In the first feeding regime, larvae were fed standard live diets of mixed microalgae from the first to the third protozoea (PZ1 to PZ3), followed by Artemia nauplii until postlarva 1 (PL1). In the second feeding regime, larvae were fed a diet of Artemia nauplii at the beginning of the PZ2 stage. Like other penaeids, P. semisulcatus larvae showed high trypsin activity during the late protozoeal or early mysis stages, which decreased during subsequent stages when fed on conventional live diets of microalgae followed by Artemia nauplii during the mysis stages. P. semisulcatus larvae fed Artemia nauplii from PZ2 onward were significantly heavier on reaching M1 than those fed microalgae (P < 0.05). In contrast, the survival rate of larvae fed with the first feeding regime was higher than that of those in the second feeding regime (P < 0.05). The trypsin activity level in stages PZ2, PZ3, M1, and M2 fed Artemia nauplii was significantly lower than that in the same stages fed microalgae (P < 0.05). La croissance, la survie et l'activité de la trypsine des larves de Penaeus semisulcatus ont été examinées avec deux régimes alimentaires différents au cours du développement larvaire en laboratoire. Dans le premier régime alimentaire les larves ont été nourries avec un régime vivant standard fait d'un mélange de micro-algues au cours des stades prézoés PZ1 à PZ3, suivi par des nauplii d'Artemia jusqu'à la post larve 1 (PL1). Dans le second régime alimentaire, les larves ont été nourries de nauplii d'Artemia à partir du stade PZ2. Comme chez les autres pénéides, les larves de P. semisulcatus montrent une forte activité de la trypsine au cours des derniers stades prézoés et au début des stades mysis, activité qui décroît au cours des stades suivants avec le premier régime. Les larves de P. semisulcatus nourries avec des nauplii d'Artemia à partir de PZ2 ont été significativement plus lourdes en mysis 1 (M1) que celles nourries avec les micro-algues (P < 0,05). Par contre, le taux de survie des larves nourries avec le premier régime a été plus élevé que celui de celles nourries avec le deuxième régime (P < 0,05). Le niveau d'activité de la trypsine au cours des stades PZ2, PZ3, M1 et M2 nourris avec les nauplii d'Artemia a été significativement plus bas que celui des mêmes stades nourris par micro-algues (P < 0,05).

Affiliations: 1: Faculty of Fisheries, Ege University, TR-35100 Bornova-İzmir, Turkey; 2: Biochemistry Department, Faculty of Science, Ege University, TR-35100 Bornova-İzmir, Turkey


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