• CHANDA JHA
• ABHAY KUMAR
• TAPAN KUMAR GHOSH

The swim bladder of Mastacembelus armatus and Macrognathus aculeatum (family: Mastacembelidae) are silvery white, elongated and tubular structures. The swim bladder of Mastacembelus armatus is semi-transparent while in Macrognathus aculeatum, it is absolutely transparent in texture. The gas secreting complex in M. armatus is present in the form of five to six curved patches while in M. aculeatum it is in the form of a single unit which is an inverted ‘U’ shaped structure. The surface ultrastructure of the gas secreting complex in both these fishes shows a central depressed area and slightly raised or bulging marginal areas. The region near the middle depressed core are characterized by some raised microvillous cells along with some typical rosette like structure scattered over the surface in M. aculeatum whereas the same area in M. armatus has some round structures with pores along with a few microvillous cells.

Swim bladder, Gas secreting complex, Ultrastructure, Mastacembelus armatus, Macrognathus aculeatum.

"GROSS AND ULTRASTRUCTURAL DETAILS OF THE SWIM BLADDER (GAS SECRETING COMPLEX IN PARTICULAR) OF TWO MASTACEMBELLIDS- Mastacembelus armatus AND Macrognathus aculeatum.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 10, page no.618-626, October-2020, Available :http://www.jetir.org/papers/JETIR2010074.pdf

"GROSS AND ULTRASTRUCTURAL DETAILS OF THE SWIM BLADDER (GAS SECRETING COMPLEX IN PARTICULAR) OF TWO MASTACEMBELLIDS- Mastacembelus armatus AND Macrognathus aculeatum.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 10, page no. pp618-626, October-2020, Available at : http://www.jetir.org/papers/JETIR2010074.pdf