Histophysiology of the pituitary gland in correlation with the ovarian cycle in Tor (Barbus) tor (Ham.)

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

“…Later, on the approach of the spawning period, the cyanophils show hyperplasia and hyper trophy and exhibit m arked secretory changes in the form of degranu lation and vacuolisation. Such changes have also been noticed by earlier workers in the species studied by them (Sundararaj [ 19591, Olivereau andBall|1964|, Lal [1964], IIonma and Tamura [1965], Rai [1966]). During the postspawning phase of G. pectinopterus, the cyanophils degenerate and most of them appear to have discharged their contents.…”

“…Sathyanesan 11960. 1963], Robertson and Wexler [1962], Honma andTamura [1963, 1965], Barr and Hobson [1964]and Rai [1966] have made important contributions by their studies on various tcleostean species. The present paper is an attempt to elucidate the histophysiology of the pituitary gland in correlation with the reproductive cycle of a female sisorid ratfish G.pectinopterus, so as to furnish information about the role of the pituitary gland in the biological cycle of this fish.…”

Gonadotrops in agnatha, fishes and amphibia

“…The teleost p itu ita ry contains gonadotrops in th e proxim al pars distalis, as in the case of higher v erteb rates [Olivereau, 1962a[Olivereau, , b, 1963Stahl, 1963;Olivereau and Ball, 1964;R ai, 1965, 1966a. Because of being equally cyanophilic gonadotrops cannot be distinguished from th y ro tro p s with trichrom e techniques.…”

“…b|. 'Variation in their quantity and size asso ciated with the secretory and nonsecrctory phase of the cyanophils do suggest their implication in their physiological activity' [Rai, 1966a). In addition to glyco protein granules, Rai.i.…”

“…W herever a tte m p ts have been m ade, the iden tification appears to be ra th e r dubious. Study of the biological cycle and experim ental studies have helped in identifying the gonadotrops [Atz, 1953: O livereau andH erlant, 1960;Stahl el al., 1960;Stahl, 1963: Olivereau andBall 1964;Rai, 1966a, b ;O livereau, 1967). The occurrence of two categories of gonadotrops; F SH and L H -secreting cyanophils have earlier been reported in A nguilla males whose gonads were activ ated by prolan injection [Olivereau and Herlant,I960] However, in a recent publication O livereau 119671 concurs with R ai's observations [ 1966a, b| and points out the difficulty in se p a ra t ing tw o types of gonadotrops in the fem ale Anguilla whose separation into FSH and LH -secreting cells has earlier been reported in male Anguilla [Olivereau and H erlant,I960], It is interesting to record here th a t only a single purified gonadotropic factor has been obtained from G yprinus carpio p itu ita ry [B urzawa and Fontaine, 1965].…”