تأثير مدة الإضاءة في نمو و تكاثر Cyclops varicans (G. O. Sars, 1863)‎ (Cyclopioda-Copepoda)‎

الملخص EN

The species Cyclops varicans G.O.Sars (Which was recorded for the first time in Iraq) was chossen to study the effect of photoperiods on the species reproduction growth.

The chossen photoperiods were 0 : 24, 12 : 12, and 24 : 0 L.D.

The data showed obvious statistical effect of photoperiods specially 24 : 0 L.D.

on the mean of clutch size, produced eggs, no.

of nauplei, transformation time of nauplius I to copepodid I and transformation time of copepodid I to adult stage.

The data also showed uneven effects of photoperiods on the number and maturation period of both males and females.

Temperature, transparency, PH, and electrical conductivity also have been studied for the adoption as ideal condition in the laboratory for the growth and reproduce of this species.