1. The study presents adaptive and acclimatory changes observed in Cyprinus carpio communis L with respect to ovarian cycle and serum levels of electrolytes, calcium, total proteins and albumin as a consequence of wide temperature and sunshine variation in the natural environment of Dal lake in Srinagar, Kashmir (India).2. The atmospheric temperatures in Srinagar show well-defined seasonal and diurnal variations. During the period of study, the mean monthly average temperature in summer (June-August) was 24°C whereas in winter (December-February) it fell to 3.6°C. The total hours of sunshine during the winter months were about half of those found in summer.3. Under local thermal and photo conditions the fish was found to spawn once a year compared to biannual spawning in tropical chmates. 4. A significant decrease was found in serum sodium, potassium and chloride concentrations during the months of January and February when the mean minimum atmospheric temperatures reached -2.5°C and -l.2°C respectively. 5. The serum calcium levels showed a marked increase during the period corresponding to ovarian maturity and spawning of fish. 6. A significant rise in total serum protein concentration was induced by decreased environmental temperatures. Serum albumin levels were found to exhibit a sharp fall coinciding with the spawning period.
Ulcerative dermal necrosis, a disease of migratory salmonid fishes in the rivers of the British Isles. Biological Conservation, 2(2), pp. 129-32, 5 figs. PYEFINCH, K.A. & MILLS, D.H. (1963). Observations on the movements of Atlantic Salmon (Salmo salar L.) in the River Conon and the River Meig, Ross-shire, I.
The origin and course of hypothalamic neurosecretory tracts is demonstrated by in situ staining procedure. Both Pars parvocellularis and Pars magnocellularis, components of nucleus preopticus, contribute to the formation of the right and left main neurosecretory tract. Anteriorly the tract is loosely assembled and formed of 3 subsidiary tracts which later join at the level of horizontal commissure to form a thick consolidated single tract. From the main tract several bundles ofaxons are given towards the mid-ventral region at the point of curvature to form ventromedian tracts. The ventromedian-and the main tract of each side jointly enter the pituitary, anterio-dorsally.
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