Embryonic development of marine ornamental shrimp, Lysmata amboinensis (De Man, 1888)

摘要

Aim: In this study, reproductive cycle, particularly embryonic development stages of Lysmata amboinensis are discussed.Methodology: Four pairs of broodstock were reared in tanks under following conditions : 28 degrees C +/- 1 degrees C, 30 ppt salinity and 12L :12D photoperiod. The observations on the spawning activities and reproductive cycle were recorded. Digital images of eggs development were taken, described and illustrated. In addition, eggs of each stage were kept in 4% formalin for histological procedures.Results : Cleaner shrimp went through seven phases of embryonic development viz. unfertile phase, cleavage, blastula, gastrula, pre-nauplius stage, post-nauplius stage and complete embryo phase within approximate 13 days of incubation period. The present investigation aided by histological procedure showed that primordial cells (PCs) were detected early in the examined embryos and formed germ disc as gastrula stage begun. Gastrula stage was a superior stage of embryonic development where organ enlarged to form early structure of the organism.Interpretation : The understanding of the embryology process would be helpful to enhance the breeding trials of this particular shrimp.