• H MD Mohideen

      Articles written in Proceedings – Animal Sciences

    • Influence of light intensity on retinomotor responses inChanna punctatus (Bleeker)

      R Baskaran H MD Mohideen

      More Details Abstract Fulltext PDF

      In bright light-adapted (25 Iux) retina ofChanna punctatus, the pigment in the epithelial cell is fully migrated into the epithelial cell protuberances. In dim light-adapted retimae (6, 3 and 1 lux), the pigment concentration gradually decreases into the tips of the epithelial cell protuberances and its concentration gradually increases in the origin of the epithelial cell protuberances. In dark-adapted retina, the pigment is fully expanded into the epithelial cell. The pigment concentration is more in the vitread region. The cones remain contracted in light-adapted retinae of various light intensities. The rods are visible only in dim light-adapted (6, 3 and 1 lux) retinae and invisible in dark (0 lux). The mechanism of pigment migration in this fish is different from those of other fish.

    • Visual capacity of marine teleostNemipterus japonicus (Bloch)

      S Raveendran H MD Mohideen

      More Details Abstract Fulltext PDF

      The differential distribution of cones in the various regions of the retina of the fishNemipterus japonicus (Bloch) was studied. In tangential section two types of cones are observed viz single and double cones, double cones being greater in number than single cones. Of the total cones, double cones constitute 86% while single cones constitute only 14%. In most of the retinal regions, cones are in the square mosaic pattern. The temporal region has greater number of cones than the other retinal regions which were studied. The correlation coefficients for the temporal region with all other regions are invariably positive.

      The test shows that there is no significance between the eyes whereas significance is observed among the various retinal regions. The pattern of cone arrangement agrees with the bottom dwelling habit of the fish. The shape of the eye is modified by being slightly ablong with comparatively longer anterio-posterior axis. The retinal cup is more hollow at the temporal region than at the nasal region.

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