Reproductive Aspect and Embryonic Development of Wader Fish ( Rasbora lateristriata Bleeker, 1854) from Purworejo, Central Java

Abstract

Indonesian native fish "Wader pari" (Rasbora lateristriata) from Purworejo is one of the fish has high economic value, which is related to the community enthusiasts and high requests for the fish stock. The demand for fish availability and supply is increasing drastically, which caused fish population to decline and leads to possible population depletion in wild. Therefore, it is necessary to carry out intensive cultivation efforts to be able to maintain the population in the wild while at the same time meeting the demand for consumption needs. It is necessary to implement an intensive cultivation program, which is targeted to become one solution for the existing problem of fish threat. The development of Wader Purworejo cultivation is a constraint by the lack of biological information related to aspects of reproduction and embryo development of the fish. This study aims to determine the quality, eggs hatching rate and embryonic development stages of R. lateristriata from Purworejo. Eggs were collected and grouped randomly into a petri with a total of 100 eggs/petri dish. Egg quality was observed using a microscope focusing on the developmental progression of eggs from two cells to dome stage with 3 repetitions. Egg quality was determined based on the percentage of normal eggs. The hatching rate was calculated by comparing the number of eggs hatched with the total number of eggs at 24-36 hpf. The results showed that the percentage of normal eggs was 95.7% and hatching rate was 81.3%. Embryonic development from one cell stage to larvae hatching were about 24 hpf, which contained of stage of zygote stage, cleavage, blastula, gastrula, segmentation, pharyngula and hatching, respectively.