Study of Histomorphological Changes in the Digestive Tubules of Freshwater Bivalve, Indonaia caeruleus from Kukadi River at Yedgaon Dam During Different Seasons

The freshwater bivalve molluscs, Indonaia caeruleus (75-78 mm shell length) were collected from banks of Kukadi River at Yedgaon during summer, monsoon and winter seasons for the study of histological changes in the digestive tubules. The histological study showed that, ducts and tubules of digestive gland grouped in the form of small lobules, separated by inter lobular connective tissues. The tubule consists of digestive cells and secretary cells. The primary tubules in the Indonaia caeruleus showed synchronized pattern of different phases such as fragmentation of spherules, holding phase and absorption phase, according to changes in water level over the animal bed, rainfall, oxygen contents and probable changes in the detritus matter (i.e. food availability) on the habitat. Tubule consists of two types of cells (a) digestive cells and (b) secretary cells. Amoebocytes are found scattered in the interlobular connective tissues. The diameter of primary digestive tubules was found maximum during monsoon while it was found minimum during summer and winter seasons. During monsoon tubules were in fragmentation spherules phase. The tubules progressed in holding and absorption phases from late monsoon to winter season. The absorption phase in the tubules was found dominant during winter which probably indicated less availability of food. The results of the study are discussed in the light of effect of environmental parameters over the habitat.

Arun R. Gulave*1 Click here to download file

Research Article | Published online : 22-Apr-2024