The study of Reproductive behaviors and growth of Caspian Sea Amphipod: (Pontogammarus maeoticus)

In order to study of reproductive stages of Caspian Sea Amphipod the sampling was made in southern coasts of Caspian sea( Jefrood beache). Amphipods transferred to laboratory with some their native sediment. Samples were maintained in controlled laboratory condition as temperature of 2510C, salinity of 9± 0.5 ppt and a 12 hrs light - dark regime. The average priod spent in precopula stage was about 2.6±0.91 days and embryonic development took about 8.5 ±1.05 days. The fecundity was estimated as the number of fertilized eggs existing in brood pouch of each female(14.125). first precopula was observed after about 40 days of birth.To assay Assay of various feed composition on growth of Gammarus, of similar size of Gammarus were fed by composite food of (fish- potato), (fish- bread) , (fish-leaf), (leaf-potato), (leaf-bread) , (bread-potato). At the end of 6th week the head of all specimens were measured. The obtained result of statistically analyzed and showed, significant difference between the treatments (p0.05) The combined potato- bread food was determined the most suitable food to feed Gammarus.