• T Subramoniam

      Articles written in Proceedings – Animal Sciences

    • Sex pheromone in a stomatopod crustaceanSquilla holoschista

      M Deecaraman T Subramoniam

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      The stomatopods are well-known for their aggressive and agonistic encounters. The males are normally aggressive; the females too in the non-reproductive condition show such a behaviour with males. InS. holoschista mating is frequent as well as repetitive. The present paper explains whether there is any involvement of sex pheromone. The sex pheromones are considered to be present in ovaries, cement glands as well as oviducal extractions. These substances were tested for their pheromonal activity. The results indicate that there may not be such attraction as evidenced by the lack of mating gestures from the isolated males in the presence of these substances. It is therefore suggested that the mating in the stomatopod,S. holoschista is indiscriminate. The physiological effect of such a repeated and indiscriminate mating on the female is discussed.

    • Synchronous development of the ovary and the female accessory sex glands of a crustacean,Squilla holoschista

      M Deecaraman T Subramoniam

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      Based on the histology of the female accessory sex glands (cement glands) and the sequential appearance of their secretory products, four stages have been distinguished in the development of the cement glands inS. Holoschista. This paper describes the various stages in ovarian development and correlates them to the cement glands activity. A further correlation between the ovarian and cement glands activity has been shown by statistical analyses. A possible endocrine mechanism regulating the synchronous activity of the ovary and cement glands is proposed.

    • Histochemistry of the neurosecretory systems in a stomatopod crustaceanSquilla holoschista

      M Deecaraman T Subramoniam

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      The histochemistry of secretory material in neurosecretory cells (NSC) ofSquilla holosckista has been investigated. The cells of eyestalk, thoracic ganglia and brain contain different substances with regard to reproductively active and quiescent phases. The NSC of eyestalkC andD are rich in protein, associated with sulphur containing aminoacids. TheB type of NSC of thoracic ganglia is rich in lipoprotein, whereas theC type of the brain is glycolipoprotein.

    • Endocrine regulation of ovarian maturation and cement glands activity in a stomatopod crustaceanSquilla holoschista

      M Deecaraman T Subramoniam

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      InS. Holoschista, the eyestalk is provided with four types of neurosecretory cells (NSC) while the thoracic ganglia and the brain each have three types. The activities of certain NSC types of the eyestalk (C and D), the thoracic ganglia (B) and the brain (C) show fluctuations in their secretory activity during the synchronous growth of the ovary and cement glands suggesting their involvement in the control of these organs. Eyestalk ablation experiments on the reproductively quiescent female revealed the inhibitory nature of an eyestalk hormone on the ovarian and cement glands growth. On the other hand, aqueous extract of thoracic ganglia from the mature reproductive females promoted ovarian and cement glands activities, when injected into the quiescent females. But brain extract injection failed to affect the activity of the ovary or cement glands.

    • Histochemical studies on the vitellogenesis in a fairy shrimpStreptocephalus dichotomus Baird (Crustacea: Anostraca)

      N Munuswamy T Subramoniam

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      Histochemical characterisation of ooplasm and yolk granules in different stages of oocyte maturation in the ovary was made in the freshwater fairy shrimpStreptocephalus dichotomus. In stage I oocyte, the ooplasm is reactive to basic and acidic groups of protein, aromatic groups such as tryptophenyl and tyrosyl and sulphur containing substances. The other organic compounds include acid mucopolysaccharide and acidic lipids. In stage II oocyte, sudanophilic lipoidal substances appear coinciding with yolk formation. Stage III oocytes are characterised by the abundance of yolk granules which are rich in sulphated acid mucopolysaccharide as well as glycogen. Besides these, the presence of acid phosphatase activity in the ooplasm and nurse cell is also noticed and its functional role in relation to vitellogenesis is discussed.

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