DEVELOPMENT OF THE DIGESTIVE TRACT OF IDE LEUCISCUS IDUS (L.) DURING THE LARVAL STAGE
Teresa Ostaszewska, Arleta Wegner, Marta Węgiel
Division of Ichthyobiology and Fisheries, Faculty of Animal Science, Warsaw Agricultural University, Warsaw, Poland
ABSTRACT. The morphogenesis of the digestive tract and swim bladder of ide Leuciscus idus (L.) was analyzed using histopathological methods. At the moment of hatching, ide larvae are more advanced in their development than the larvae of other teleost fish species. Endo-exogenous nutrition began on day 2 post hatch. At this stage of development, the intestine was lined with a single-layered cylindrical epithelium, and both liver and pancreas began to function. Signs of digestion and enterocyte protein and lipid absorption were observed on day 6 of development. The mucus cells in the mouth, esophagus and gullet produced neutral and acidic mucins. Intestinal cuboid cells appeared on the fourth day and only began secreting acidic carboxyl and sulfate mucins. The differentiation of the air duct and the posterior chamber of the swim bladder was observed on the day of hatching, and the bladder inflated after 24 hours. The anterior chamber began to form on day 9, and it inflated with gas between days 23 and 25 of larval development.
KEY WORDS: IDE (LEUCISCUS IDUS), LARVAL PERIOD, DIGESTIVE TRACT
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