Seasonal Changes in the Ovary of a Sisorid Catfish, Glyptosternum pectinopterum

Morphology of ovarian changes during the reproductive cycle of the fish, <i>Mystus tengara</i> (Ham.)

“…The first batch of eggs is apparently shed from July to August and the second from August to Septem ber. Thus this fish, like Gly piaster mini | K hanka and Pant, 1967], belongs to the category of asynchronism after Marza [1938] and to the second category of P rabiiu 11956]. Hence, M ystus is an annual breeder with the spawning season extending from July through September, when heavy monsoons occur.…”

“…Finally, it moves away toward the outer ooplasm where it disintegrates and disappears from view [Guraya, 1968]. I'lie yolk nucleus of fish oocyte generally is a spherical and homo geneous structure [Guraya, 1963[Guraya, , 1965aNayyar, 1904;R astogi, 1966b, K hanka andPant, 1967], bu t in some fish it is differentiated into separate zones of variable width [Gopal D utt, 1964]. The exact role of yolk nucleus in vitellogenesis is still unknown.…”

Cyclic changes in the pituitary gland of Glyptothorax pectinopterus (McClelland) in correlation with its reproductive cycle

“…The pituitary gland and the ovaries were dissected out from the same individual. The procedure for studying the cyclic changes in the ovary has already been described in an earlier paper (Khanna and Pant [1967]). The pituitary glands were fixed in aqueous Bouin, mercuric formal dehyde.…”

Reproductive biology of a hillstream catfish, Glyptothorax madraspatanum (Day), from the Garhwal, Central Himalaya, India

“…Some important contributions to the breeding biology of catfishes in India have been made by Ghosh & Kar (1952), Sathyanesan (1959), Saiga! & Motwani (1961), David (1963), Saigal (1964), Ratogi (1965), Khanna & Pant (1966), Nayyar & Sundarraj (1970), Bhatt (1971), Dann (1977), Vasudevappa & James (1980), Singh, Dobriyal & Nauriyal (1985), Das (1987) and Dobriyal & Singh (1989). However, there is no literature on the breeding biology of G. madraspatanum.…”