Annual cyclic variations in some biochemical constituents of seminal vesicle and testis of the catfish Heteropneustes fossilis (Bloch): a study correlating plasma testosterone level.
In Heteropneustes fossilis, significant annual variations were observed in seminal vesicle-somatic index (SVSI), gonadosomatic index (GSI), concentrations of total proteins, hexosamines, fructose and glucose in both SV and testis, and in plasma testosterone with high values in late prespawning-early spawning phases (June-July) and low or undetectable levels in resting phase (December-January) except for glucose. There is an inverse relationship between the annual patterns of fructose and glucose with fructose dominant in the prespawning and early spawning phases (June-July), and glucose in the resting phase (November-January). The increase in the concentrations of SV and testicular protein, hexosamine and fructose can be correlated with the increase in testosterone concentration on one hand and with the increase of SVSI and GSI, on the other. The decrease in glucose level in the recrudescent phase may be due to its increased conversion into fructose, the main seminal sugar in this species.
Chowdhury
I
I
Department of Zoology, Banaras Hindu University, Varanasi, India.
Joy
K P
KP
D000818:Animals; D002397:Catfishes / Q000502:physiology*; D005632:Fructose / Q000032:analysis; D005947:Glucose / Q000032:analysis; D006595:Hexosamines / Q000032:analysis; D008297:Male; D009929:Organ Size; D010507:Periodicity; D012669:Seminal Vesicles / Q000737:chemistry*; D013737:Testis / Q000737:chemistry*; D013739:Testosterone / Q000097:blood*
D006595:Hexosamines; D005632:Fructose; D013739:Testosterone; D005947:Glucose