الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
There are many environmental and physiological factors
can induce physiological, biochemical and
jendocrine changes controlling the reproduction of
>sts. Photoperiod, temperature and salinity are very
:ant environmental factors in this aspect. Hormonal ipy is a very important physiological factor that can Late many vital processes important for the animal Lology.
The present study aims at the investigation of the »nce of photoperiod, temperature, salinity and HCG Lon on Mugil capita during the period of natural breeding concerning the following effects:
tBffect on Gonadosomatic index (GSI) and egg diameter. pffect on gonad histology.
ffect on some sexual hormones.
:fect on some haematological parameters.
ifect on isoelectric focusing profile of protein itterns of plasma and gonads.
ie present experiments were run in parallel to avoid il differences in response
present investigation revealed the following
Gonadosomatic index (GSI) in both sexes of Mugil jreased with the increase of photoperiod. At the »e, the GSI in complete darkness also decreased
So, continuous illumination as well as continuous