• A D Diwan

      Articles written in Proceedings – Animal Sciences

    • Morpho-histology of the pituitary gland of the estuarine teleost fish,Valamugil cunnesius (Valenciennes)

      Asha Narayan K C George A D Diwan

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      Six different cell types were identified in the pituitary gland on the basis of their characteristic arrangement, distribution and staining properties. The lactotrops and thyrotrops were identified in the rostral pars distalis and the corticortrops in the interphase between the neurohypophysis and the rostral pars distalis. The somatotrops and the gonadotropic cells were distinguished in the proximal pars distalis and the melanotrops in the pars intermedia.

    • Osmoregulatory ability ofPenaeus indicus H Milne Edwards in relation to varying salinities

      A D Diwan A Laxminarayana

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      JuvenilePenaeus indicus osmoregulated well between 3–26‰ S for 24 and 48 h duration with isosmotic points ≈S 18‰ and ≈S 14‰ respectively. Adults also showed good osmoregulatory capability between 5–30‰ S with isosmotic points ≈ S 21‰ and ≈S 17‰ for 24 and 48 h duration respectively. A duration of 48 h is essential for prawns to adjust to the new medium. Influence of various neuroendocrine centres on the osmolal concentration of haemolymph was studied. In eyestalk ablated prawns osmolal concentration decreased with time and reached a lowest after 48 h. Eyestalk ablated prawns injected with extracts of eyestalk, brain and thoracic ganglia did not show any decrease in the values with time but remained on par with the values of normal ones.

    • Changes in nucleic acids and protein content in relation to body size in the prawnPenaeuss indicus H Milne Edwards

      George Thomas A D Diwan

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      This study was carried out to find out the relationships of RNA, DNA content, RNA/DNA ratio and protein levels with different size length individuals ofPenaeus indicas. RNA, DNA content, and RNA/DNA ratio were found to be high in small sized prawns, with increased amount of protein. There was a decline in RNA concentration as size of the prawns increased, thus showing an inverse relationship. Though DNA values also showed a slight decline with increase in size, among large sized prawns there was a tendency to conserve DNA content. RNA/DNA ratio has been found useful in correlating growth (in terms of protein increase) only in small sized prawns.

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